texlive[50293] Master: fiziko (8mar19)
commits+karl at tug.org
commits+karl at tug.org
Fri Mar 8 23:22:37 CET 2019
Revision: 50293
http://tug.org/svn/texlive?view=revision&revision=50293
Author: karl
Date: 2019-03-08 23:22:36 +0100 (Fri, 08 Mar 2019)
Log Message:
-----------
fiziko (8mar19)
Modified Paths:
--------------
trunk/Master/tlpkg/bin/tlpkg-ctan-check
trunk/Master/tlpkg/tlpsrc/collection-metapost.tlpsrc
Added Paths:
-----------
trunk/Master/texmf-dist/doc/metapost/fiziko/
trunk/Master/texmf-dist/doc/metapost/fiziko/README
trunk/Master/texmf-dist/doc/metapost/fiziko/fiziko.pdf
trunk/Master/texmf-dist/doc/metapost/fiziko/fiziko.tex
trunk/Master/texmf-dist/metapost/fiziko/
trunk/Master/texmf-dist/metapost/fiziko/fiziko.mp
trunk/Master/tlpkg/tlpsrc/fiziko.tlpsrc
Added: trunk/Master/texmf-dist/doc/metapost/fiziko/README
===================================================================
--- trunk/Master/texmf-dist/doc/metapost/fiziko/README (rev 0)
+++ trunk/Master/texmf-dist/doc/metapost/fiziko/README 2019-03-08 22:22:36 UTC (rev 50293)
@@ -0,0 +1,19 @@
+Name: fiziko
+Version: 0.1.3
+License: GNU GPLv3 or later
+Author: Sergey Slyusarev
+Repository: https://github.com/jemmybutton/fiziko
+
+Description:
+This MetaPost library was initially written to automate
+some elements of black and white illustrations for a physics
+textbook. It provides functions to draw things like lines
+of variable width, shaded spheres and tubes of different kinds,
+which can be used to produce images of a variety of objects.
+The library also contains functions to draw some objects
+constructed from these primitives.
+
+Contents:
+fiziko.mp — the library itself
+fiziko.tex — documentation source
+fiziko.pdf — documentation pdf
Property changes on: trunk/Master/texmf-dist/doc/metapost/fiziko/README
___________________________________________________________________
Added: svn:eol-style
## -0,0 +1 ##
+native
\ No newline at end of property
Added: trunk/Master/texmf-dist/doc/metapost/fiziko/fiziko.pdf
===================================================================
(Binary files differ)
Index: trunk/Master/texmf-dist/doc/metapost/fiziko/fiziko.pdf
===================================================================
--- trunk/Master/texmf-dist/doc/metapost/fiziko/fiziko.pdf 2019-03-08 22:21:13 UTC (rev 50292)
+++ trunk/Master/texmf-dist/doc/metapost/fiziko/fiziko.pdf 2019-03-08 22:22:36 UTC (rev 50293)
Property changes on: trunk/Master/texmf-dist/doc/metapost/fiziko/fiziko.pdf
___________________________________________________________________
Added: svn:mime-type
## -0,0 +1 ##
+application/pdf
\ No newline at end of property
Added: trunk/Master/texmf-dist/doc/metapost/fiziko/fiziko.tex
===================================================================
--- trunk/Master/texmf-dist/doc/metapost/fiziko/fiziko.tex (rev 0)
+++ trunk/Master/texmf-dist/doc/metapost/fiziko/fiziko.tex 2019-03-08 22:22:36 UTC (rev 50293)
@@ -0,0 +1,841 @@
+\documentclass{article}
+
+\usepackage{luamplib}
+\everymplib{verbatimtex \leavevmode etex; input fiziko.mp; beginfig(1);}
+\everyendmplib{endfig;}
+
+\usepackage{listings}
+\lstset{
+language=MetaPost,
+numbers=left,
+numberstyle=\tiny,
+basicstyle=\scriptsize
+}
+
+\usepackage{cclicenses}
+
+\author{Sergey Slyusarev}
+\title{``fiziko'' v. 0.1.3 package for MetaPost}
+
+\begin{document}
+\maketitle
+
+\begin{abstract}
+This document describes a bunch of macros provided by ``fiziko'' library for MetaPost.
+\end{abstract}
+
+\begin{centering}
+
+This document is distributed under CC-BY-SA 4.0 license
+
+\cc\bysa
+
+https://github.com/jemmybutton/fiziko
+
+\end{centering}
+
+\section{Introduction}
+This MetaPost library was initially written to automate some elements of black and white illustrations for a physics textbook. First and foremost it provides functions to draw things like lines of variable width, shaded spheres and tubes of different kinds, which can be used to produce images of a variety of objects. The library also contains functions to draw some objects constructed from these primitives.
+
+\section{Usage}
+Simply include this in the beginning of your MetaPost document:
+
+\begin{lstlisting}
+input fiziko.mp
+\end{lstlisting}
+
+\section{Global variables}
+A few global variables control different aspects of the behavior of the provided macros. Not all possible values are meaningful and some will definitely result in ugly pictures or errors.
+
+\subsection{minStrokeWidth}
+This variable controls minimal thickness of lines that are used for shading. Below this value lines are not getting thinner, but become dashed instead, maintaining roughly the same amount of ink per unit length as a thinner line would take. Default value is one fifth of a point. There are several things that depend on this value, so it's convenient to change it using a macro:
+
+\begin{lstlisting}
+defineMinStrokeWidth(1/2pt);
+\end{lstlisting}
+
+\subsection{lightDirection}
+This variable controls direction from which light falls on shaded objects. It's of \texttt{pair} type and is set in radians. Default direction is top-left:
+
+\begin{lstlisting}
+lightDirection := (-1/8pi, 1/8pi);
+\end{lstlisting}
+
+\section{``Lower level'' macros}
+Currently, algorithms are quite stupid and will produce decent results only in certain simple circumstances.
+
+\subsection{offsetPath (\emph{path})(\emph{offset function})}
+This macro returns offset path (of type \texttt{path}) to a current path with a distance from the original path controlled by some arbitrary function; typically, it is a function of path length, set as either \texttt{offsetPathTime} or \texttt{offsetPathLength}. Former is simply \texttt{time} on current path and changes from 0 to \texttt{length(path)}, and latter changes from 0 to 1 over the path \texttt{arctime} (as a function of \texttt{arclength}).
+
+\begin{lstlisting}
+ path p, q;
+ p := (0,0){dir(30)}..(5cm, 0)..{dir(30)}(10cm, 0);
+ q := offsetPath(p)(1cm*sin(offsetPathLength*pi));
+ draw p;
+ draw q dashed evenly;
+\end{lstlisting}
+
+\begin{mplibcode}
+ path p, q;
+ p := (0,0){dir(30)}..(5cm, 0)..{dir(30)}(10cm, 0);
+ q := offsetPath(p)(1cm*sin(offsetPathLength*pi));
+ draw p;
+ draw q dashed evenly;
+\end{mplibcode}
+
+\subsection{brush (\emph{path})(\emph{offset function})}
+This macro returns a \texttt{picture} of a line of variable width along given path, which is controlled by some arbitrary function, analogous to \texttt{offsetPath}. If line is getting thinner than \texttt{minStrokeWith}, it is drawn dashed.
+
+\begin{lstlisting}
+ path p;
+ p := (0,0){dir(30)}..(5cm, 0)..{dir(30)}(10cm, 0);
+ draw brush (p)(2minStrokeWidth*sin(offsetPathLength*pi));
+\end{lstlisting}
+
+\begin{mplibcode}
+ path p;
+ p := (0,0){dir(30)}..(5cm, 0)..{dir(30)}(10cm, 0);
+ draw brush (p)(2minStrokeWidth*sin(offsetPathLength*pi));
+\end{mplibcode}
+
+\subsection{sphere.c (\emph{diameter})}
+This macro returns a \texttt{picture} of a sphere with specified diameter shaded with concentric strokes. Strokes are arranged to fit those of \texttt{tube.l}.
+
+\begin{lstlisting}
+ for i := 1 step 1 until 6:
+ draw sphere.c(i*1/4cm) shifted (1/2cm*(i*(i+1))/2, 0);
+ endfor;
+\end{lstlisting}
+
+\begin{mplibcode}
+ for i := 1 step 1 until 6:
+ draw sphere.c(i*1/4cm) shifted (1/2cm*(i*(i+1))/2, 0);
+ endfor;
+\end{mplibcode}
+
+\subsection{sphere.l (\emph{diameter, angle})}
+This macro returns a \texttt{picture} of a shaded sphere with specified diameter. Unlike \texttt{sphere.c} macro, this one draws latitudinal strokes around axis rotated at specified \texttt{angle}.
+
+\begin{lstlisting}
+ for i := 1 step 1 until 6:
+ draw sphere.l(i*1/4cm, -90 + i*30)
+ shifted (1/2cm*(i*(i+1))/2, 0);
+ endfor;
+\end{lstlisting}
+
+\begin{mplibcode}
+ for i := 1 step 1 until 6:
+ draw sphere.l(i*1/4cm, -90 + i*30)
+ shifted (1/2cm*(i*(i+1))/2, 0);
+ endfor;
+\end{mplibcode}
+
+\subsection{tube.l (\emph{path})(\emph{offset function})}
+This macro returns a \texttt{picture} of a shaded ``tube'' of a variable width along a given path, which is controlled by some arbitrary function, analogous to \texttt{offsetPath}. ``Tube'' drawn by this macro is shaded be longitudal strokes. Once tube is generated, you can call \texttt{tubeOutline} path global variable, if you need one.
+
+\begin{lstlisting}
+ path p;
+ p := (0,0){dir(30)}..(5cm, 0)..{dir(30)}(10cm, 0);
+ draw tube.l (p)(1/2cm*sin(offsetPathLength*pi));
+\end{lstlisting}
+
+\begin{mplibcode}
+ path p;
+ p := (0,0){dir(30)}..(5cm, 0)..{dir(30)}(10cm, 0);
+ draw tube.l (p)(1/2cm*sin(offsetPathLength*pi));
+\end{mplibcode}
+
+\subsection{tube.t (\emph{path})(\emph{offset function})}
+This macro returns a \texttt{picture} of a shaded ``tube'' of variable width along given path, which is controlled by some arbitrary function, analogous to \texttt{offsetPath}. ``Tube'' drawn by this macro is shaded be transverse strokes. Once tube is generated, you can call \texttt{tubeOutline} path global variable, if you need one.
+
+\begin{lstlisting}
+ path p;
+ p := (0,0){dir(30)}..(5cm, 0)..{dir(30)}(10cm, 0);
+ draw tube.t (p)(1/2cm*sin(offsetPathLength*pi));
+\end{lstlisting}
+
+\begin{mplibcode}
+ path p;
+ p := (0,0){dir(30)}..(5cm, 0)..{dir(30)}(10cm, 0);
+ draw tube.t (p)(1/2cm*sin(offsetPathLength*pi));
+\end{mplibcode}
+
+\subsection{tube.e (\emph{path})(\emph{offset function})}
+This macro returns the outline of a tube as a path.
+
+\section{``Higher level'' macros}
+Using macros described in the previous section it is possible to construct more complex images. Macros for drawing some often used images are present in this package.
+
+\subsection{eye (\emph{angle})}
+This macro returns a \texttt{picture} of an eye pointed at the direction \texttt{angle} (in degrees). Eye size is controlled by a global variable \texttt{eyescale}, which has default value of \texttt{eyescale := 1/2cm;}.
+
+\begin{lstlisting}
+ save eyescale;
+ for i := 1 step 1 until 6:
+ eyescale := 1/6cm*i;
+ draw eye(i*60) shifted (1/2cm*(i*(i+1))/2, 0);
+ endfor;
+\end{lstlisting}
+
+\begin{mplibcode}
+ save eyescale;
+ for i := 1 step 1 until 6:
+ eyescale := 1/6cm*i;
+ draw eye(i*60) shifted (1/2cm*(i*(i+1))/2, 0);
+ endfor;
+\end{mplibcode}
+
+\subsection{pulley (\emph{diameter, angle})}
+This macro returns a \texttt{picture} of a pulley with specified \texttt{diameter} and its support pointed at the direction \texttt{angle} (in degrees). Note that pulley's support protrudes from its center by \texttt{pulleySupportSize*diameter} and by default \texttt{pulleySupportSize} = 3/2. Once pulley is generated, you can call \texttt{pulleyOutline} path global variable, if you need one.
+
+\begin{lstlisting}
+ draw (-1/8cm, 0)--(12cm, 0);
+ for i := 1 step 1 until 6:
+ r := 1/7cm*i;
+ draw image(
+ draw pulley(2r, 0) shifted (0, -4/3r);
+ draw (r, -4/3r) -- (r, -2cm);
+ drawarrow (-r, -4/3r) -- (-r, -2cm);
+ ) shifted (1/2cm*(i*(i+1))/2, 0);
+ endfor;
+\end{lstlisting}
+
+\begin{mplibcode}
+ draw (-1/8cm, 0)--(12cm, 0);
+ for i := 1 step 1 until 6:
+ r := 1/7cm*i;
+ draw image(
+ draw pulley(2r, 0) shifted (0, -4/3r);
+ draw (r, -4/3r) -- (r, -2cm);
+ drawarrow (-r, -4/3r) -- (-r, -2cm);
+ ) shifted (1/2cm*(i*(i+1))/2, 0);
+ endfor;
+\end{mplibcode}
+
+\subsection{pulleyWheel (\emph{diameter})}
+This macro returns a \texttt{picture} of a pulley wheel with specified \texttt{diameter}.
+
+\begin{lstlisting}
+ for i := 1 step 1 until 6:
+ r := 1/7cm*i;
+ draw image(
+ draw pulleyWheel(2r);
+ draw (r, 0) -- (r, 1cm);
+ drawarrow (-r, 0) -- (-r, 1cm);
+ ) shifted (1/2cm*(i*(i+1))/2, 0);
+ endfor;
+\end{lstlisting}
+
+\begin{mplibcode}
+ for i := 1 step 1 until 6:
+ r := 1/7cm*i;
+ draw image(
+ draw pulleyWheel(2r);
+ draw (r, 0) -- (r, 1cm);
+ drawarrow (-r, 0) -- (-r, 1cm);
+ ) shifted (1/2cm*(i*(i+1))/2, 0);
+ endfor;
+\end{mplibcode}
+
+\subsection{wheel (\emph{diameter, angle})}
+This macro returns a \texttt{picture} of a wheel with specified \texttt{diameter} and its support pointed at the direction \texttt{angle} (in degrees).
+
+\begin{lstlisting}
+ draw (-1/8cm, 0)--(12cm, 0);
+ for i := 1 step 1 until 6:
+ r := 1/7cm*i;
+ draw wheel(2r, 0) shifted (0, -r) shifted (1/2cm*(i*(i+1))/2, 0);
+ endfor;
+\end{lstlisting}
+
+\begin{mplibcode}
+ draw (-1/8cm, 0)--(12cm, 0);
+ for i := 1 step 1 until 6:
+ r := 1/7cm*i;
+ draw wheel(2r, 0) shifted (0, -r) shifted (1/2cm*(i*(i+1))/2, 0);
+ endfor;
+\end{mplibcode}
+
+
+\subsection{weight.s (\emph{height})}
+This macro returns a \texttt{picture} of a weight of a specific \texttt{height} that is standing on the point \texttt{(0, 0)}.
+
+\begin{lstlisting}
+ for i := 1 step 1 until 6:
+ draw weight.s(1/4cm + i*1/4cm) shifted (1/2cm*(i*(i+1))/2, 0);
+ endfor;
+ draw (-1/8cm, 0)--(12cm, 0);
+\end{lstlisting}
+
+\begin{mplibcode}
+ for i := 1 step 1 until 6:
+ draw weight.s(1/4cm + i*1/4cm) shifted (1/2cm*(i*(i+1))/2, 0);
+ endfor;
+ draw (-1/8cm, 0)--(12cm, 0);
+\end{mplibcode}
+
+\subsection{weight.h (\emph{height})}
+This macro returns a \texttt{picture} of a weight of a specific \texttt{height} that is is hanging from the point \texttt{(0, 0)}.
+
+\begin{lstlisting}
+ for i := 1 step 1 until 6:
+ draw weight.h(1/4cm + i*1/4cm) shifted (1/2cm*(i*(i+1))/2, 0);
+ endfor;
+ draw (12cm, 0)--(-1/8cm, 0);
+\end{lstlisting}
+
+\begin{mplibcode}
+ for i := 1 step 1 until 6:
+ draw weight.h(1/4cm + i*1/4cm) shifted (1/2cm*(i*(i+1))/2, 0);
+ endfor;
+ draw (12cm, 0)--(-1/8cm, 0);
+\end{mplibcode}
+
+
+\subsection{spring (\emph{point a, point b, number of steps})}
+This macro returns a \texttt{picture} of a spring stretched between points \texttt{a} and \texttt{b} (of type \texttt{pair}), with specified \texttt{number of steps}. Spring width is controlled by global variable \texttt{springwidth} with the default value \texttt{springwidth := 1/8cm;}.
+
+\begin{lstlisting}
+ pair a, b;
+ a := (0, 0);
+ for i := 1 step 1 until 6:
+ springwidth := 1/16cm + i*1/48cm;
+ b := (i*1/3cm, - i*1/5cm);
+ draw spring (a, b, 10) shifted (2/5cm*(i*(i+1))/2, 0);
+ endfor;
+\end{lstlisting}
+
+\begin{mplibcode}
+ pair a, b;
+ a := (0, 0);
+ for i := 1 step 1 until 6:
+ springwidth := 1/16cm + i*1/48cm;
+ b := (i*1/3cm, - i*1/5cm);
+ draw spring (a, b, 10) shifted (2/5cm*(i*(i+1))/2, 0);
+ endfor;
+\end{mplibcode}
+
+\subsection{solidSurface (\emph{path})}
+This macro returns a \texttt{picture} of a solid surface on the right side of a given \texttt{path}.
+
+\begin{lstlisting}
+ path p;
+ p := (0,0){dir(30)}..(5cm, 0)..{dir(30)}(10cm, 0);
+ draw solidSurface(p);
+\end{lstlisting}
+
+\begin{mplibcode}
+ path p;
+ p := (0,0){dir(30)}..(5cm, 0)..{dir(30)}(10cm, 0);
+ draw solidSurface(p);
+\end{mplibcode}
+
+\subsection{solid (\emph{path, angle, type})}
+Fills given \texttt{path} with strokes of specific type at a given \texttt{angle}. \texttt{type} can be 0 (``solid'' strokes) and 1 (``glass'' strokes).
+
+\subsection{woodBlock (\emph{width, height})}
+Returns a \texttt{picture} of a rectangular block of wood with its bottom-left corner in the origin.
+
+\begin{lstlisting}
+ draw woodBlock(10cm, 1/2cm);
+\end{lstlisting}
+
+\begin{mplibcode}
+ draw woodBlock(10cm, 1/2cm);
+\end{mplibcode}
+
+\subsection{woodenThing (\emph{path, angle})}
+Returns a \texttt{picture} of a wood texture at a given \texttt{angle} fitted into a given \texttt{path}.
+
+\begin{lstlisting}
+ path p, q;
+ p := dir(-60) scaled 1/2 -- dir(90) scaled 2/3 -- dir (-120) scaled 3/5 -- cycle;
+ for i := 1 step 1 until 6:
+ q := (p scaled 3/2cm) rotated (i*60);
+ draw woodenThing (q, i*60) shifted (2cm*i, 0);
+ endfor;
+\end{lstlisting}
+
+\begin{mplibcode}
+ path p, q;
+ p := dir(-60) scaled 1/2 -- dir(90) scaled 2/3 -- dir (-120) scaled 3/5 -- cycle;
+ for i := 1 step 1 until 6:
+ q := (p scaled 3/2cm) rotated (i*60);
+ draw woodenThing (q, i*60) shifted (2cm*i, 0);
+ endfor;
+\end{mplibcode}
+
+\subsection{globe (\emph{radius, longitude, latitude})}
+This macro returns a \texttt{picture} of the globe of specified \texttt{radius} centered at specific \texttt{longitude} and \texttt{latitude};
+
+\begin{lstlisting}
+ for i := 1 step 1 until 6:
+ draw globe(i*1/4cm, i*60, -90 + i*30)
+ shifted (1/2cm*(i*(i+1))/2, 0);
+ endfor;
+\end{lstlisting}
+
+\begin{mplibcode}
+ for i := 1 step 1 until 6:
+ draw globe(i*1/4cm, i*60, -90 + i*30)
+ shifted (1/2cm*(i*(i+1))/2, 0);
+ endfor;
+\end{mplibcode}
+
+\subsection{Knots}
+There are two macros to handle knot drawing: \texttt{addStrandToKnot} and \texttt{knotFromStrands}. Currently the algorithm is not especially stable.
+
+\subsubsection{addStrandToKnot (\emph{knotName}) (\emph{path, ropeWidth, ropeType, intersectionOrder})}
+This macro adds a strand to knot named \texttt{knotName} and returns nothing. Strand follows the given \texttt{path} and has a given \texttt{ropeWidth}. \texttt{ropeType} can be \texttt{"l"}, \texttt{"t"} (as in \texttt{tube.l} and \texttt{tube.t}) or \texttt{"e"} (for an unshaded strand). \texttt{intersectionOrder} is a string of comma separated numbers which represent a ``layer'' to which intersections along the strand go.
+
+\subsubsection{knotFromStrands (\emph{knotName})}
+This macro returns a picture of a knot with a given \texttt{knotName}.
+
+\begin{lstlisting}
+ path p[];
+ p1 := (dir(90)*4/3cm) {dir(0)} .. tension 3/2
+ .. (dir(90 + 120)*4/3cm){dir(90 + 30)} .. tension 3/2
+ .. (dir(90 - 120)*4/3cm){dir(-90 - 30)} .. tension 3/2
+ .. cycle;
+ p2 := (fullcircle scaled 3cm) shifted (0, -3/2cm);
+ p3 := (fullcircle scaled 4cm);
+ addStrandToKnot (theknot) (p1 shifted (4cm, -4cm), 1/5cm, "l",
+ "-1,1,-1,1,-1,1,-1,1,-1");
+ addStrandToKnot (theknot) (p2 shifted (4cm, -4cm), 1/6cm, "l",
+ "");
+ addStrandToKnot (theknot) (p3 shifted (4cm, -4cm), 1/7cm, "l",
+ "-1,1");
+ draw knotFromStrands (theknot);
+\end{lstlisting}
+
+\begin{mplibcode}
+ path p[]; path p[];
+ p1 := (dir(90)*4/3cm) {dir(0)} .. tension 3/2
+ .. (dir(90 + 120)*4/3cm){dir(90 + 30)} .. tension 3/2
+ .. (dir(90 - 120)*4/3cm){dir(-90 - 30)} .. tension 3/2
+ .. cycle;
+ p2 := (fullcircle scaled 3cm) shifted (0, -3/2cm);
+ p3 := (fullcircle scaled 4cm);
+ addStrandToKnot (theknot) (p1 shifted (4cm, -4cm), 1/5cm, "l",
+ "-1,1,-1,1,-1,1,-1,1,-1");
+ addStrandToKnot (theknot) (p2 shifted (4cm, -4cm), 1/6cm, "l",
+ "");
+ addStrandToKnot (theknot) (p3 shifted (4cm, -4cm), 1/7cm, "l",
+ "-1,1");
+ draw knotFromStrands (theknot);
+\end{mplibcode}
+
+\section{Other macros}
+Some macros that are not directly related to drawing are listed below
+
+\subsection{refractionPath (\emph{initial ray, shape, refraction coefficient})}
+This macro returns a \texttt{path} that represent refraction of some \texttt{ray} (any variable of type \texttt{path}, point next to last in a given path is considered a source of a ``ray'', and last point determines its direction) through some \texttt{shape} with given \texttt{refraction coefficient}. When appropriate, the ``ray'' is fully internally reflected.
+
+Setting \texttt{refraction coefficient} to 0 results in reflection instead of refraction in all cases.
+
+\begin{lstlisting}
+ path r, p;
+ p := fullcircle scaled 2.1cm;
+ draw p;
+ for i:= 1cm step -1/4cm until -1cm:
+ r := (-4cm, i) -- (-1cm, i);
+ draw refractionPath(r, p, 1.5);
+ endfor;
+\end{lstlisting}
+
+\begin{mplibcode}
+ path r, p;
+ p := fullcircle scaled 2.1cm;
+ draw p;
+ for i:= 1cm step -1/4cm until -1cm:
+ r := (-4cm, i) -- (-1cm, i);
+ draw refractionPath(r, p, 1.5);
+ endfor;
+\end{mplibcode}
+
+
+\subsection{lens (\emph{(left radius, right radius), thickness, diameter, units})}
+This macro returns a \texttt{path} that represent a section of a lens with given radii of curvature (positive value for convex, negative --- for concave), thickness (i. e. distance benween sides' centers) and diameter (i. e. height) in given arbitrary units.
+
+\begin{lstlisting}
+ draw lens((5, 10), 1/2, 2, cm);
+ draw lens((-10, -5), 1/4, 2, cm) shifted (2cm, 0);
+ draw lens((infinity, 7), 1/4, 2, cm) shifted (4cm, 0);
+\end{lstlisting}
+
+\begin{mplibcode}
+ draw lens((5, 10), 1/2, 2, cm);
+ draw lens((-10, -5), 1/4, 2, cm) shifted (2cm, 0);
+ draw lens((infinity, 7), 1/4, 2, cm) shifted (4cm, 0);
+\end{mplibcode}
+
+\section{Auxilary macros}
+Some macros that not related to physical problems at all are listed below.
+
+\subsection{\emph{picture} maskedWith \emph{path}}
+This macro masks a part of a \texttt{picture} with closed \texttt{path}. In fact this is inversion of metapost's built-in \texttt{clip} but, in contrast to the latter, it does not modify original image. Note that it requires that counter-clockwise \texttt{path} to work properly.
+
+\subsection{\emph{path} firstIntersectionTimes \emph{path}}
+This macro is similar to metapost's \texttt{intersectiontimes} but it returns intersection times with smallest time on first path.
+
+\subsection{pathSubdivide \emph{path, n}}
+This macro returns original \texttt{path} with \texttt{n}-times more points.
+
+\subsection{drawmidarrow (\emph{path})}
+Draws \texttt{path} with arrows in the middles of segments with length no less than \texttt{midArrowLimit} (another global variable, 1cm by default).
+
+\subsection{markAngle (\emph{point a, point o, point b})(\emph{text})}
+This macro marks an angle \texttt{aob} (counter-clockwise) with some \texttt{text}
+
+\begin{lstlisting}
+ pair a, o, b;
+ for i:= 30 step 60 until 390:
+ o := (10cm*(i/360), 0);
+ a := dir(i/2)*4/3cm shifted o;
+ b := dir(i)*4/3cm shifted o;
+ draw (a--o--b);
+ markAngle(a, o, b)(btex $\alpha$ etex);
+ endfor;
+\end{lstlisting}
+
+\begin{mplibcode}
+ pair a, o, b;
+ for i:= 30 step 60 until 390:
+ o := (10cm*(i/360), 0);
+ a := dir(i/2)*4/3cm shifted o;
+ b := dir(i)*4/3cm shifted o;
+ draw (a--o--b);
+ markAngle(a, o, b)(btex $\alpha$ etex);
+ endfor;
+\end{mplibcode}
+
+
+\section{Some examples}
+
+\subsection{Gregory-Maksutov type telescope}
+Lines 3--11 define parameters of lenses and mirrors\footnote{Taken from here http://www.google.ru/patents/US2701983}. Lines 12--16 generate lenses. On line 20 shape of prism is defined. Line 22 cuts part of the rear mirror. Line 26 describes mirror part of the front lens. On lines 31--33 all the glass parts are drawn. On lines 34--36 all the mirror ones. On lines 39--44 rays are traced through all system in order specified in loop on line 41. Lines 49--56 are about the telescope frame.
+\begin{lstlisting}
+ path p[], q[], axis[], f[]; pair o;
+ u := 6mm;
+ r1 := -36.979; r2 := -r1; t1 := 0.7; n1 := 1.517; d1 := 5;
+ l1 := 8.182;
+ r3 := -11.657; r4 := r3; t2 := 0.2; n2 := n1; d2 := 3/2;
+ l2 := 0.4;
+ r5 := -30.433; r6 := 9.598; t3 := 0.39; n3 := 1.621; d3 := d2;
+ l3 := 0.828;
+ r7 := -35.512; r8 := infinity; t4 := 0.7; n4 := 0; d4 := d1;
+ l4 := 5.272;
+ ll0 := 0;
+ for i := 1 upto 4:
+ ll[i] := ll[i-1] + t[i] + l[i];
+ p[i] := lens ((r[i*2 - 1], r[i*2]), t[i], d[i], u)
+ shifted (ll[i-1]*u, 0);
+ endfor;
+ axis1 := (0, 0) -- (ll4*u, 0);
+ axis2 := reverse(axis1);
+ ll5 := ll4 - 1/2l4;
+ p5 := ((-1,-1) -- (1,1) -- (-1,1) -- cycle)
+ scaled (1/2d2*u) shifted (ll5*u, 0);
+ p6 := (subpath
+ (ypart((axis1 shifted (0, 1/2d2*u)) firstIntersectionTimes p4),
+ ypart((axis2 shifted (0, 1/2d2*u)) firstIntersectionTimes p4))
+ of p4) -- cycle;
+ p7 := (subpath
+ (ypart((axis2 shifted (0, 3/4d2*u)) firstIntersectionTimes p1),
+ ypart((axis2 shifted (0, -3/4d2*u)) firstIntersectionTimes p1))
+ of p1);
+ p7 := p7 -- (reverse(p7) shifted ((-1/3t1)*u, 0)) -- cycle;
+ for i := 1, 2, 3, 5:
+ draw p[i] withpen thickpen; draw solid (p[i], 45, 1);
+ endfor;
+ draw solid (p7, -45, 0);
+ draw p6 withpen thickpen; draw solid (p6, -45, 0);
+ draw p6 yscaled -1 withpen thickpen;
+ draw solid (p6 yscaled -1, -45, 0);
+ n7 := 0; n5 := n1;
+ for i := 0, 1:
+ q[i] := (-3/2u, -2u + i*4u) -- (16u, -2u + i*4u);
+ for j = 1, 4, 7, 2, 3, 5:
+ q[i] := refractionPath(q[i], p[j], n[j]);
+ endfor;
+ endfor;
+ o := whatever[point length(q0) of q0, point length(q0)-1 of q0]
+ = whatever[point length(q1) of q1, point length(q1)-1 of q1];
+ for i := 0, 1: drawmidarrow (q[i] -- o) withpen thinpen; endfor;
+ draw eye(-91) shifted o shifted (0, u);
+ f1 := (-1/4u, 1/2d1*u) -- ((ll3 + t4)*u, 1/2d1*u)
+ -- ((ll3 + t4)*u, 1/2d2*u);
+ f2 := (ll1*u - 1/8u, 1/2d2*u) -- (ll5*u - 1/2d2*u, 1/2d2*u)
+ -- (ll5*u - 1/2d2*u, ypart(o));
+ f3 := (ll1*u - 1/8u, -1/2d2*u) -- (ll5*u + 1/2d2*u, -1/2d2*u)
+ -- (ll5*u + 1/2d2*u, ypart(o));
+ draw f1 withpen fatpen; draw f1 yscaled -1 withpen fatpen;
+ draw f2 withpen fatpen; draw f3 withpen fatpen;
+\end{lstlisting}
+
+\begin{mplibcode}
+ path p[], q[], axis[], f[]; pair o;
+ u := 6mm;
+ r1 := -36.979; r2 := -r1; t1 := 0.7; n1 := 1.517; d1 := 5;
+ l1 := 8.182;
+ r3 := -11.657; r4 := r3; t2 := 0.2; n2 := n1; d2 := 3/2;
+ l2 := 0.4;
+ r5 := -30.433; r6 := 9.598; t3 := 0.39; n3 := 1.621; d3 := d2;
+ l3 := 0.828;
+ r7 := -35.512; r8 := infinity; t4 := 0.7; n4 := 0; d4 := d1;
+ l4 := 5.272;
+ ll0 := 0;
+ for i := 1 upto 4:
+ ll[i] := ll[i-1] + t[i] + l[i];
+ p[i] := lens ((r[i*2 - 1], r[i*2]), t[i], d[i], u)
+ shifted (ll[i-1]*u, 0);
+ endfor;
+ axis1 := (0, 0) -- (ll4*u, 0);
+ axis2 := reverse(axis1);
+ ll5 := ll4 - 1/2l4;
+ p5 := ((-1,-1) -- (1,1) -- (-1,1) -- cycle)
+ scaled (1/2d2*u) shifted (ll5*u, 0);
+ p6 := (subpath
+ (ypart((axis1 shifted (0, 1/2d2*u)) firstIntersectionTimes p4),
+ ypart((axis2 shifted (0, 1/2d2*u)) firstIntersectionTimes p4))
+ of p4) -- cycle;
+ p7 := (subpath
+ (ypart((axis2 shifted (0, 3/4d2*u)) firstIntersectionTimes p1),
+ ypart((axis2 shifted (0, -3/4d2*u)) firstIntersectionTimes p1))
+ of p1);
+ p7 := p7 -- (reverse(p7) shifted ((-1/3t1)*u, 0)) -- cycle;
+ for i := 1, 2, 3, 5:
+ draw p[i] withpen thickpen; draw solid (p[i], 45, 1);
+ endfor;
+ draw solid (p7, -45, 0);
+ draw p6 withpen thickpen; draw solid (p6, -45, 0);
+ draw p6 yscaled -1 withpen thickpen;
+ draw solid (p6 yscaled -1, -45, 0);
+ n7 := 0; n5 := n1;
+ for i := 0, 1:
+ q[i] := (-3/2u, -2u + i*4u) -- (16u, -2u + i*4u);
+ for j = 1, 4, 7, 2, 3, 5:
+ q[i] := refractionPath(q[i], p[j], n[j]);
+ endfor;
+ endfor;
+ o := whatever[point length(q0) of q0, point length(q0)-1 of q0]
+ = whatever[point length(q1) of q1, point length(q1)-1 of q1];
+ for i := 0, 1: drawmidarrow (q[i] -- o) withpen thinpen; endfor;
+ draw eye(-91) shifted o shifted (0, u);
+ f1 := (-1/4u, 1/2d1*u) -- ((ll3 + t4)*u, 1/2d1*u)
+ -- ((ll3 + t4)*u, 1/2d2*u);
+ f2 := (ll1*u - 1/8u, 1/2d2*u) -- (ll5*u - 1/2d2*u, 1/2d2*u)
+ -- (ll5*u - 1/2d2*u, ypart(o));
+ f3 := (ll1*u - 1/8u, -1/2d2*u) -- (ll5*u + 1/2d2*u, -1/2d2*u)
+ -- (ll5*u + 1/2d2*u, ypart(o));
+ draw f1 withpen fatpen; draw f1 yscaled -1 withpen fatpen;
+ draw f2 withpen fatpen; draw f3 withpen fatpen;
+\end{mplibcode}
+
+\subsection{L'H\^{o}pital's Pulley Problem}
+Line 3 describe initial setup. Line 4 is problem's solution. Lines 8--11 set all the points where they belong. Lines 12--16 are needed to decide where to put the pulley.
+
+\begin{lstlisting}
+ pair p[], o[];
+ numeric a, d[], l[], x[], y[];
+ l0 := 6; l1 := 4; l2 := 4;
+ x1 := (l1**2 + abs(l1)*((sqrt(8)*l0)++l1))/4l0;
+ y1 := l1+-+x1;
+ y2 := l2 - ((l0-x1)++y1);
+ d1 := 2/3cm; d2 := 4/3cm; d3 := 5/6d1;
+ p1 := (0, 0);
+ p2 := (l0*cm, 0);
+ p3 := (x1*cm, -y1*cm);
+ p4 := p3 shifted (0, -y2*cm);
+ o1 := (unitvector(p4-p3) rotated 90 scaled 1/2d3);
+ o2 := (unitvector(p3-p2) rotated 90 scaled 1/2d3);
+ p5 := whatever [p3 shifted o1, p4 shifted o1]
+ = whatever [p3 shifted o2, p2 shifted o2];
+ a := angle(p1-p3);
+ draw solidSurface(11/10[p1,p2] -- 11/10[p2, p1]);
+ draw pulley (d1, a - 90) shifted p5;
+ draw image(
+ draw p1 -- p3 -- p2 withpen thickpen;
+ draw p3 -- p4 withpen thickpen;
+ ) maskedWith (pulleyOutline shifted p5);
+ draw sphere.c(d2) shifted p4 shifted (0, -1/2d2);
+ dotlabel.llft(btex $A$ etex, p1);
+ dotlabel.lrt(btex $B$ etex, p2);
+ dotlabel.ulft(btex $C$ etex, p4);
+ label.llft(btex $l$ etex, 1/2[p1, p3]);
+ markAngle(p3, p1, p2)(btex $\alpha$ etex);
+\end{lstlisting}
+
+\begin{mplibcode}
+ pair p[], o[];
+ numeric a, d[], l[], x[], y[];
+ l0 := 6; l1 := 4; l2 := 4;
+ x1 := (l1**2 + abs(l1)*((sqrt(8)*l0)++l1))/4l0;
+ y1 := l1+-+x1;
+ y2 := l2 - ((l0-x1)++y1);
+ d1 := 2/3cm; d2 := 4/3cm; d3 := 5/6d1;
+ p1 := (0, 0);
+ p2 := (l0*cm, 0);
+ p3 := (x1*cm, -y1*cm);
+ p4 := p3 shifted (0, -y2*cm);
+ o1 := (unitvector(p4-p3) rotated 90 scaled 1/2d3);
+ o2 := (unitvector(p3-p2) rotated 90 scaled 1/2d3);
+ p5 := whatever [p3 shifted o1, p4 shifted o1]
+ = whatever [p3 shifted o2, p2 shifted o2];
+ a := angle(p1-p3);
+ draw solidSurface(11/10[p1,p2] -- 11/10[p2, p1]);
+ draw pulley (d1, a - 90) shifted p5;
+ draw image(
+ draw p1 -- p3 -- p2 withpen thickpen;
+ draw p3 -- p4 withpen thickpen;
+ ) maskedWith (pulleyOutline shifted p5);
+ draw sphere.c(d2) shifted p4 shifted (0, -1/2d2);
+ dotlabel.llft(btex $A$ etex, p1);
+ dotlabel.lrt(btex $B$ etex, p2);
+ dotlabel.ulft(btex $C$ etex, p4);
+ label.llft(btex $l$ etex, 1/2[p1, p3]);
+ markAngle(p3, p1, p2)(btex $\alpha$ etex);
+\end{mplibcode}
+
+\subsection{Hooke's law}
+
+\begin{lstlisting}
+ numeric l[],d, h;
+ pair p[], q[];
+ l0 := 3/2cm; l1 := 1cm;
+ d := 1cm; h := 7/8cm;
+ p1 := (0, 0); p2 := (0, -l0);
+ p3 := (d, 0); p4 := (d, -l0-l1);
+ p5 := (2d, 0); p6 := (2d, -l0-2l1); p7 := (2d, -l0-2l1-h);
+ draw solidSurface((2d + 1/2cm, 0)--(-1/2cm, 0));
+ draw spring(p1, p2, 20);
+ draw spring(p3, p4, 20);
+ draw weight.h(h) shifted p4;
+ draw spring(p5, p6, 20);
+ draw weight.h(h) shifted p6;
+ draw weight.h(h) shifted p7;
+ q1 := (0, ypart(p2));
+ q2 := (0, ypart(p4));
+ q3 := (0, ypart(p6));
+ draw p2 -- q1 withpen thinpen;
+ draw p4 -- q2 withpen thinpen;
+ draw p6 -- q3 withpen thinpen;
+ drawdblarrow q1--q2 withpen thinpen;
+ drawdblarrow q2--q3 withpen thinpen;
+ label.lft (btex $x$ etex, 1/2[q1, q2]);
+ label.lft (btex $x$ etex, 1/2[q2, q3]);
+\end{lstlisting}
+
+\begin{mplibcode}
+ numeric l[],d, h;
+ pair p[], q[];
+ l0 := 3/2cm; l1 := 1cm;
+ d := 1cm; h := 7/8cm;
+ p1 := (0, 0); p2 := (0, -l0);
+ p3 := (d, 0); p4 := (d, -l0-l1);
+ p5 := (2d, 0); p6 := (2d, -l0-2l1); p7 := (2d, -l0-2l1-h);
+ draw solidSurface((2d + 1/2cm, 0)--(-1/2cm, 0));
+ draw spring(p1, p2, 20);
+ draw spring(p3, p4, 20);
+ draw weight.h(h) shifted p4;
+ draw spring(p5, p6, 20);
+ draw weight.h(h) shifted p6;
+ draw weight.h(h) shifted p7;
+ q1 := (0, ypart(p2));
+ q2 := (0, ypart(p4));
+ q3 := (0, ypart(p6));
+ draw p2 -- q1 withpen thinpen;
+ draw p4 -- q2 withpen thinpen;
+ draw p6 -- q3 withpen thinpen;
+ drawdblarrow q1--q2 withpen thinpen;
+ drawdblarrow q2--q3 withpen thinpen;
+ label.lft (btex $x$ etex, 1/2[q1, q2]);
+ label.lft (btex $x$ etex, 1/2[q2, q3]);
+\end{mplibcode}
+
+\subsection{Weight on a cart}
+
+\begin{lstlisting}
+ numeric l, w, r, h;
+ l := 4cm;
+ w := 1/4cm;
+ r := 2/3cm;
+ h := 1cm;
+ draw solidSurface((-1/5l, 0) -- (6/5l, 0));
+ draw woodBlock (l, w) shifted (0, r);
+ draw wheel (r, 0) shifted (r, 1/2r);
+ draw wheel (r, 0) shifted (l-r, 1/2r);
+ draw weight.s(h) shifted (1/2l, r + w);
+\end{lstlisting}
+
+\begin{mplibcode}
+ numeric l, w, r, h;
+ l := 4cm;
+ w := 1/4cm;
+ r := 2/3cm;
+ h := 1cm;
+ draw solidSurface((-1/5l, 0) -- (6/5l, 0));
+ draw woodBlock (l, w) shifted (0, r);
+ draw wheel (r, 0) shifted (r, 1/2r);
+ draw wheel (r, 0) shifted (l-r, 1/2r);
+ draw weight.s(h) shifted (1/2l, r + w);
+\end{mplibcode}
+
+\subsection{Some knots}
+
+\begin{lstlisting}
+ path p[];
+ p1 := (dir(90)*4/3cm) {dir(0)} .. tension 3/2
+ .. (dir(90 + 120)*4/3cm){dir(90 + 30)} .. tension 3/2
+ .. (dir(90 - 120)*4/3cm){dir(-90 - 30)} .. tension 3/2
+ .. cycle;
+ p1 := p1 scaled 6/5;
+ addStrandToKnot (primeOne) (p1, 1/4cm, "l", "1, -1, 1");
+ draw knotFromStrands (primeOne);
+ p2 := (0, 2cm) .. (1/2cm, 3/2cm) .. (-1/2cm, 0)
+ .. (1/2cm, -2/3cm) .. (4/3cm, 0) .. (0, 17/12cm)
+ .. (-4/3cm, 0) .. (-1/2cm, -2/3cm) .. (1/2cm, 0)
+ .. (-1/2cm, 3/2cm) .. cycle;
+ p2 := p2 scaled 6/5;
+ addStrandToKnot (primeTwo) (p2, 1/4cm, "l", "1, -1, 1, -1, 1");
+ draw knotFromStrands (primeTwo) shifted (4cm, 0);
+ p3 := (dir(0)*3/2cm) .. (dir(1*72)*2/3cm)
+ .. (dir(2*72)*3/2cm) .. (dir(3*72)*2/3cm)
+ .. (dir(4*72)*3/2cm) .. (dir(0)*2/3cm)
+ .. (dir(1*72)*3/2cm) .. (dir(2*72)*2/3cm)
+ .. (dir(3*72)*3/2cm) .. (dir(4*72)*2/3cm)
+ .. cycle;
+ p3 := (p3 rotated (72/4)) scaled 6/5;
+ addStrandToKnot (primeThree) (p3, 1/4cm, "l", "-1, 1, -1, 1, -1");
+ draw knotFromStrands (primeThree) shifted (8cm, 0);
+\end{lstlisting}
+
+\begin{mplibcode}
+ path p[];
+ p1 := (dir(90)*4/3cm) {dir(0)} .. tension 3/2
+ .. (dir(90 + 120)*4/3cm){dir(90 + 30)} .. tension 3/2
+ .. (dir(90 - 120)*4/3cm){dir(-90 - 30)} .. tension 3/2
+ .. cycle;
+ p1 := p1 scaled 6/5;
+ addStrandToKnot (primeOne) (p1, 1/4cm, "l", "1, -1, 1");
+ draw knotFromStrands (primeOne);
+ p2 := (0, 2cm) .. (1/2cm, 3/2cm) .. (-1/2cm, 0)
+ .. (1/2cm, -2/3cm) .. (4/3cm, 0) .. (0, 17/12cm)
+ .. (-4/3cm, 0) .. (-1/2cm, -2/3cm) .. (1/2cm, 0)
+ .. (-1/2cm, 3/2cm) .. cycle;
+ p2 := p2 scaled 6/5;
+ addStrandToKnot (primeTwo) (p2, 1/4cm, "l", "1, -1, 1, -1, 1");
+ draw knotFromStrands (primeTwo) shifted (4cm, -2cm);
+ p3 := (dir(0)*3/2cm) .. (dir(1*72)*2/3cm)
+ .. (dir(2*72)*3/2cm) .. (dir(3*72)*2/3cm)
+ .. (dir(4*72)*3/2cm) .. (dir(0)*2/3cm)
+ .. (dir(1*72)*3/2cm) .. (dir(2*72)*2/3cm)
+ .. (dir(3*72)*3/2cm) .. (dir(4*72)*2/3cm)
+ .. cycle;
+ p3 := (p3 rotated (72/4)) scaled 6/5;
+ addStrandToKnot (primeThree) (p3, 1/4cm, "l", "-1, 1, -1, 1, -1");
+ draw knotFromStrands (primeThree) shifted (8cm, 0);
+\end{mplibcode}
+
+
+\end{document}
\ No newline at end of file
Property changes on: trunk/Master/texmf-dist/doc/metapost/fiziko/fiziko.tex
___________________________________________________________________
Added: svn:eol-style
## -0,0 +1 ##
+native
\ No newline at end of property
Added: trunk/Master/texmf-dist/metapost/fiziko/fiziko.mp
===================================================================
--- trunk/Master/texmf-dist/metapost/fiziko/fiziko.mp (rev 0)
+++ trunk/Master/texmf-dist/metapost/fiziko/fiziko.mp 2019-03-08 22:22:36 UTC (rev 50293)
@@ -0,0 +1,2163 @@
+% fiziko 0.1.3
+% MetaPost library for physics textbook illustrations
+% Copyright 2019 Sergey Slyusarev
+%
+% This program is free software: you can redistribute it and/or modify
+% it under the terms of the GNU General Public License as published by
+% the Free Software Foundation, either version 3 of the License, or
+% (at your option) any later version.
+%
+% This program is distributed in the hope that it will be useful,
+% but WITHOUT ANY WARRANTY; without even the implied warranty of
+% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+% GNU General Public License for more details.
+%
+% You should have received a copy of the GNU General Public License
+% along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+% https://github.com/jemmybutton/fiziko
+
+%
+% Here we define some things of general interest
+%
+
+pi := 3.1415926;
+radian := 180/pi;
+
+vardef sin primary x = (sind(x*radian)) enddef;
+
+vardef cos primary x = (cosd(x*radian)) enddef;
+
+vardef log (expr n, b) =
+ save rv;
+ numeric rv;
+ if n > 0:
+ rv := (mlog(n)/mlog(b));
+ else:
+ rv := 0;
+ fi;
+ rv
+enddef;
+
+vardef arcsind primary x = angle((1+-+x,x)) enddef;
+
+vardef arccosd primary x = angle((x,1+-+x)) enddef;
+
+vardef arcsin primary x = ((arcsind(x))/radian) enddef;
+
+vardef arccos primary x = ((arccosd(x))/radian) enddef;
+
+vardef angleRad primary x = angle(x)/radian enddef;
+
+vardef dirRad primary x = dir(x*radian) enddef;
+
+% used here and there.
+
+vardef sign (expr x)=
+ if x > 0: 1 fi
+ if x < 0: -1 fi
+ if x = 0: 1 fi
+enddef;
+
+% This is inverted `clip`
+
+primarydef i maskedWith p =
+begingroup
+ save q, invertedmask, resultimage;
+ pair q[];
+ path invertedmask;
+ picture resultimage;
+ resultimage := i;
+ q1 := ulcorner(i) shifted (-1, 1);
+ q3 := lrcorner(i) shifted (1, -1);
+ q2 := (xpart(q3), ypart(q1));
+ q4 := (xpart(q1), ypart(q3));
+ bp := ypart((ulcorner(p)--llcorner(p)) firstIntersectionTimes p);
+ invertedmask := (subpath (bp, length(p) + bp) of p) -- q1 -- q2 -- q3 -- q4 -- q1 -- cycle;
+ clip resultimage to invertedmask;
+ resultimage
+endgroup
+enddef;
+
+%
+% Since metapost is somewhat unpredictable in determining where paths intersect, here's macro
+% that returns first intersection times with first path (ray) priority.
+% Actually, it is so in most cases, but sometimes second path can take precedence,
+% so the macro just checks whether reversing 'q' changes something
+%
+
+primarydef p firstIntersectionTimes q =
+begingroup
+ save t;
+ pair t[];
+ t1 := p intersectiontimes q;
+ t2 := p intersectiontimes reverse(q);
+ if xpart(t1) < xpart(t2):
+ t3 := t1;
+ else:
+ t3 := (xpart(t2), length(q) - ypart(t2));
+ fi;
+ if xpart(t1) < 0: t3 := t2; fi;
+ t3
+endgroup
+enddef;
+
+% This checks if point a is inside of closed path p
+
+primarydef a isInside p =
+begingroup
+ save ang, v, i, rv, pp;
+ boolean rv;
+ pair pp[];
+ ang := 0;
+ for i := 0 step 1/4 until (length(p)):
+ pp1 := (point i of p) - a;
+ pp2 := (point i + 1/4 of p) - a;
+ if (pp1 <> (0, 0)) and (pp2 <> (0, 0)):
+ v := angle(pp1) - angle(pp2);
+ if v > 180: v := v - 360; fi; if v < -180: v := v + 360; fi;
+ ang := ang + v;
+ fi;
+ endfor;
+ if abs(ang) > 355:
+ rv := true;
+ else:
+ rv := false;
+ fi;
+ rv
+endgroup
+enddef;
+
+%
+% sometimes it's useful to put some arrows along the path. this macro puts them
+% in the middles of the segments that have length no less than midArrowLimit;
+%
+
+midArrowLimit := 1cm;
+
+def drawmidarrow (expr p) text t =
+begingroup
+ save i, j, q;
+ path q;
+ j := 0;
+ for i := 1 upto length(p):
+ if arclength(subpath(i-1, i) of p) >= midArrowLimit:
+ q := subpath(j, i - 1/2) of p;
+ j := i - 1/2;
+ draw q t;
+ filldraw arrowhead q t;
+ fi;
+ endfor;
+ draw subpath(j, length(p)) of p t;
+endgroup
+enddef;
+
+% This macro marks angles, unsurprisingly
+
+def markAngle (expr a, o, b) (text t) =
+begingroup
+ save p, an, d;
+ numeric an[], d[];
+ pair p;
+ an1 := angle(a-o);
+ an2 := angle(b-o) - an1;
+ if (an2 < 0): an2 := an2 + 360; fi;
+ an3 := an1 + 1/2an2;
+ p := center(t);
+ d1 := abs(ulcorner(t)-lrcorner(t));
+ if (an2 < 90) and (an2 > 0):
+ d2 := max(1/3cm, (d1/(abs(sind(an2))*1/3cm))*1/3cm);
+ else:
+ d2 := 1/3cm;
+ fi;
+ draw subpath (0, 8an2/360) of fullcircle scaled 2d2 rotated an1 shifted o withpen thinpen;
+ draw (t) shifted -p shifted o shifted (dir(an3)*(d2 + d1));
+endgroup
+enddef;
+
+%
+% Here we define some auxilary global variables
+%
+
+% Offset path algorithm can subdivide original path in order to be more precise
+offsetPathSteps := 4;
+
+% The following macro sets all the values related to minimal stroke width at once.
+% It can be used to easily redefine all of them.
+def defineMinStrokeWidth (expr msw) =
+ % We don't want to display strokes that are too thin to print. Default value
+ % is subject to change when needed.
+ minStrokeWidth := msw;
+ maxShadingStrokeWidth := 2minStrokeWidth;
+
+ % At some point it's useless to display even dashes
+ minDashStrokeWidth := 1/3minStrokeWidth;
+
+ % this value corresponds to particular dashing algorithm and is subject to change whenever this algorithm changes
+ minDashStrokeLength := 3minStrokeWidth;
+
+ dashStrokeWidthStep := 1/5minDashStrokeWidth;
+
+ % all the shading algorithms need to know how close lines should be packed
+ shadingDensity := 3maxShadingStrokeWidth;
+
+ % here are some pens
+ pen thinpen, thickpen, fatpen;
+
+ thinpen := pencircle scaled minStrokeWidth;
+ thickpen := pencircle scaled 3minStrokeWidth;
+ fatpen := pencircle scaled 6minStrokeWidth;
+enddef;
+
+defineMinStrokeWidth(1/5pt);
+
+% here we set global light direction
+
+def defineLightDirection (expr ldx, ldy) =
+ pair lightDirection, lightDirectionVector;
+ lightDirection := (ldx, ldy);
+ lightDirectionVector := (sin(xpart(lightDirection)), sin(ypart(lightDirection)));
+enddef;
+
+defineLightDirection(-1/8pi, 1/8pi);
+
+boolean shadowsEnabled;
+shadowsEnabled := false;
+
+%
+% To simplify further calculations we need subdivided original path
+%
+
+vardef pathSubdivideBase (expr p, subdivideStep, i) =
+ save returnPath, sp;
+ path returnPath, sp;
+ returnPath := point i of p;
+ if i<length(p):
+ sp := subpath(i, i + subdivideStep) of p;
+ returnPath := returnPath .. controls (postcontrol 0 of sp) and (precontrol 1 of sp) .. pathSubdivideBase (p, subdivideStep, i + subdivideStep);
+ fi;
+ if (i = 0) and (cycle p):
+ (subpath(0, length(returnPath)-1) of returnPath) .. controls (postcontrol length(returnPath)-1 of returnPath) and (precontrol length(returnPath) of returnPath) .. cycle
+ else:
+ returnPath
+ fi
+enddef;
+
+vardef offsetPathSubdivide (expr p) =
+ pathSubdivideBase(p, 1/offsetPathSteps, 0)
+enddef;
+
+vardef pathSubdivide (expr p, n) =
+ pathSubdivideBase(p, 1/n, 0)
+enddef;
+
+%
+% This macro creates a template offset path to a straight line, so we can correct angles
+% It might appear as if we need to calculate derivative of the function somehow, instead of mocking it
+% but this function might be anything, function of coordinates of distance to some point etc.,
+% so consider this a lazy way to do the right thing.
+%
+% either offsetPathTime or offsetPathLength are intended to be used as arguments. offsetPathTime is for time and offsetPathLength is for distance
+%
+
+vardef offsetPathTemplate (expr p, i) (text offsetFunction) =
+ save returnPath, offsetPathTime, offsetPathLength, instantDirection, nextDirection;
+ numeric offsetPathTime, offsetPathLength, currentAngle;
+ pair instantDirection, nextDirection;
+ path returnPath;
+ if (i <= length(p)):
+ offsetPathTime := i;
+ else:
+ offsetPathTime := length(p);
+ fi;
+ if (arclength(p) > 0):
+ offsetPathLength := arclength(subpath (0, i) of p)/arclength(p);
+ else:
+ offsetPathLength := 0;
+ fi;
+ returnPath := (arclength(subpath (0, i) of p), offsetFunction);
+ if (i < length(p)):
+ % this thing is glitchy, but should be more accurate
+ %if (arclength(subpath (0, i) of p) < arclength(subpath (0, i + 1/4) of p)):
+ % offsetPathTime := i + 1/4;
+ % offsetPathLength := arclength(subpath (0, i + 1/4) of p)/arclength(p);
+ % instantDirection := unitvector((arclength(subpath (0, i + 1/4) of p), offsetFunction) - point 0 of returnPath);
+ % offsetPathTime := i + 1;
+ % offsetPathLength := arclength(subpath (0, i + 1) of p)/arclength(p);
+ % nextDirection := (arclength(subpath (0, i + 1) of p), offsetFunction);
+ % offsetPathTime := i + 3/4;
+ % offsetPathLength := arclength(subpath (0, i + 3/4) of p)/arclength(p);
+ % nextDirection := unitvector(nextDirection - (arclength(subpath (0, i + 3/4) of p), offsetFunction));
+ % returnPath := returnPath{instantDirection} .. {nextDirection}offsetPathTemplate(p, i + 1)(offsetFunction);
+ % returnPath := returnPath -- offsetPathTemplate(p, i + 1)(offsetFunction);
+ %else:
+ returnPath := returnPath -- offsetPathTemplate(p, i + 1)(offsetFunction);
+ %fi;
+ fi;
+ returnPath
+enddef;
+
+%
+% This macro creates offset path p based on previously built template q, instead of function itself
+% It is loosely based on something called Tiller-Hanson heuristic as described here:
+% http://math.stackexchange.com/questions/465782/control-points-of-offset-bezier-curve
+%
+
+vardef offsetPathGenerate (expr p, q, i) =
+ save returnPath, c, d, pl, ps;
+ path returnPath, pl[];
+ pair c[], d[];
+ c1 := precontrol i of p;
+ c2 := point i of p;
+ c3 := postcontrol i of p;
+ if abs(c1-c2) = 0:
+ c1 := c2 shifted (c2-c3);
+ fi;
+ if abs(c3-c2) = 0:
+ c3 := c2 shifted (c2-c1);
+ fi;
+ if (abs(c1-c2) > 0) and (abs(c2-c3) > 0):
+ d1 := unitvector(c1-c2) rotated -90;
+ d2 := unitvector(c2-c3) rotated -90;
+ pl1 := (unitvector(c2-c1)--unitvector(c1-c2))
+ scaled arclength(subpath (i - 1/2, i + 1/2) of p)
+ shifted (point i of p shifted (d1 scaled ypart(point i of q)));
+ pl2 := (unitvector(c2-c3)--unitvector(c3-c2))
+ scaled arclength(subpath (i - 1/2, i + 1/2) of p)
+ shifted (point i of p shifted (d2 scaled ypart(point i of q)));
+ if (abs(angle(d1) - angle(d2)) > 2) and (xpart(pl1 intersectiontimes pl2) > 0):
+ c4 := pl1 intersectionpoint pl2;
+ else:
+ c4 := c2 shifted (d1 scaled ypart(point i of q));
+ fi;
+ returnPath := c4;
+ else:
+ returnPath := c2 shifted (unitvector( (point i-1 of p) - (point i+1 of p) rotated -90) scaled ypart (point i of q));
+ fi;
+ if i < length(p):
+ path ps;
+ ps := subpath (i, i + 1) of p;
+ c1 := point 0 of ps;
+ c2 := postcontrol 0 of ps;
+ c3 := precontrol 1 of ps;
+ c4 := point 1 of ps;
+ c5 := point 0 of returnPath;
+ if (abs(c3-c4)>0)
+ and (abs(c1-c2)>0)
+ and (abs(c1-c4)>0)
+ and (abs(direction i of q) > 0):
+ c6 := c4 shifted (unitvector(c4 - c3) rotated 90 scaled ypart(point i + 1 of q));
+ c7 := (c2 - c1) scaled (abs(c5-c6)/abs(c1-c4)) rotated angle(direction i of q) shifted c5;
+ c8 := (c3 - c4) scaled (abs(c5-c6)/abs(c1-c4)) rotated angle(direction i + 1 of q) shifted c6;
+ returnPath := returnPath .. controls c7 and c8 .. offsetPathGenerate (p, q, i + 1);
+ else:
+ returnPath := returnPath -- offsetPathGenerate (p, q, i + 1);
+ fi;
+ fi;
+ returnPath
+enddef;
+
+%
+% Frontend for offsetPathGenerate and offsetPathTemplate
+%
+
+vardef offsetPath (expr p)(text offsetFunction) =
+ offsetPathGenerate (p, offsetPathTemplate(p, 0)(offsetFunction), 0)
+enddef;
+
+%
+% Brush macro. It draws line with brush of variable width.
+% For parts thicker than minStrokeWidth it uses offsetPath functions'
+% results, for thiner parts it draws dashed lines of fixed width
+%
+
+def brushGenerate (expr p, q, i) =
+begingroup
+ save w, bp, bt, t;
+ numeric w[], t[];
+ path bp[], bt;
+ bt := q;
+ w0 := (ypart(urcorner(bt)));
+ w1 := (ypart(lrcorner(bt)));
+ t := cutPathTime(bt, minStrokeWidth);
+ if ((w0 > minStrokeWidth)
+ and (w1 < minStrokeWidth)
+ and (t > 0)
+ and (t < length(p))
+ and (arclength(p) > minDashStrokeLength)
+ and (i < 10)):
+ brushGenerate (subpath (0, t) of p, subpath (0, t) of q, i + 1);
+ brushGenerate (subpath (t, length(p)) of p, subpath (t, length(q)) of q, i + 1);
+ elseif (arclength(p) > 0):
+ if (w0 > 99/100minStrokeWidth)
+ and (w1 > 99/100minStrokeWidth):
+ bp1 := offsetPathGenerate (p, q yscaled 1/2, 0);
+ bp2 := offsetPathGenerate (p, q yscaled -1/2, 0);
+ fill bp1 -- reverse(bp2) -- cycle;
+ elseif (w0 < 101/100minStrokeWidth) and (w1 < 101/100minStrokeWidth):
+ thinBrushGenerate (p, q, 0)
+ fi;
+ fi;
+endgroup
+enddef;
+
+%
+% macro for thin lines which are actually dashed
+%
+
+def thinBrushGenerate (expr p, q, i) =
+begingroup
+ save w, bp, bt, t, h, linecap;
+ numeric w[], t[];
+ path bp[], bt;
+ bt := q;
+ w0 := (ypart(urcorner(bt)));
+ w1 := (ypart(lrcorner(bt)));
+ w2 := floor((1/2(w0 + w1))/dashStrokeWidthStep)*dashStrokeWidthStep;
+ t := cutPathTime(bt, w2);
+ bp1 := subpath (0, t) of p;
+ bp2 := subpath (t, length(p)) of p;
+ if (((w0 - w1) > dashStrokeWidthStep) and (i < 15))
+ and ((arclength(bp1) > minDashStrokeLength)
+ or (arclength(bp2) > minDashStrokeLength)):
+ thinBrushGenerate (bp1, subpath (0, t) of q, i + 1);
+ thinBrushGenerate (bp2, subpath (t, length(q)) of q, i + 1);
+ else:
+ linecap := butt;
+ if (w2 > minStrokeWidth):
+ w2 := minStrokeWidth;
+ fi;
+ if (w2 >= minDashStrokeWidth) and (arclength(p) > 0):
+ draw p withpen thinpen dashed thinBrushPattern(w2, arclength(p));
+ fi;
+ fi;
+endgroup
+enddef;
+
+%
+% this macro returns path as a shaded edge
+%
+
+vardef shadedEdge (expr p) =
+ image(
+ brushGenerate (p,
+ offsetPathTemplate (p, 0) (
+ 1/2minStrokeWidth + 2*minStrokeWidth
+ * angleToLightness(
+ sphereAngleToAbsoulteAngle(
+ (angleRad(direction offsetPathTime of p), 1/2)
+ ), 0, point offsetPathTime of p
+ )
+ ), 0);
+ )
+enddef;
+
+%
+% Whenever we have brush thinner than minStrokeWidth we call this dash pattern macro
+%
+
+vardef thinBrushPattern (expr w, l) =
+ save d;
+ numeric d[];
+ d0 := w;
+ if d0 > minStrokeWidth: d0 := minStrokeWidth; fi;
+ % d1 is a result of some arbitrary function of line width
+ % we do not use simple linear function because minimal dash length
+ % also shouldn't be less than minStrokeWidth.
+ % After we get d1 other measurements are calculated,
+ % so filled area per unit length remains adequate and dashes are aligned
+ % with segments
+ d1 := (1/2minDashStrokeLength) + (((d0/minStrokeWidth)**2)*1/2minDashStrokeLength);
+ d1 := d1 + 1/2uniformdeviate(d1);
+ d2 := (minStrokeWidth - d0)*(d1/d0);
+ d3 := round(l/(d2 + d1));
+ if (d3 < 1): d3 := 1; fi;
+ d4 := (l/d3)/(d2 + d1);
+ d1 := d1*d4;
+ d2 := d2*d4;
+ if (uniformdeviate(2) > 1):
+ dashpattern (on d1 off 2d2)
+ else:
+ dashpattern (off 2d2 on d1)
+ fi
+enddef;
+
+%
+% macro that actually draws line of variable width
+%
+
+vardef brush (expr p) (text offsetFunction) =
+ image(
+ brushGenerate (p, offsetPathTemplate(p, 0)(offsetFunction), 0);
+ )
+enddef;
+
+%
+% This macro generates tube between paths p and q, of variable width d
+% Tube is subdivided into segments in such a way that within every segment
+% we need 2**n lines to generate even fill
+%
+
+def tubeGenerate (expr p, q, d, i) =
+begingroup
+ save w, bw, k, t, tubeWidth, sp, currentPath, currentTubePath, currentDepth;
+ numeric w[], bw[], t, currentDepth;
+ path tubeWidth, sp, currentPath, currentTubePath;
+ tubeWidth := d yscaled 2;
+ w0 := (ypart(urcorner(tubeWidth))) - 1/1000;
+ w1 := (ypart(lrcorner(tubeWidth))) + 1/1000;
+ w2 := ceiling(log(w0/shadingDensity, 2));
+ w3 := ceiling(log(w1/shadingDensity, 2));
+ if ((w2 > w3) and (i<20)):
+ t := cutPathTime(tubeWidth, shadingDensity*(2**(w2-1)));
+ tubeGenerate (subpath (0, t) of p, subpath (0, t) of q, subpath (0, t) of d, i + 1);
+ tubeGenerate (subpath (t, length(p)) of p, subpath (t, length(q)) of q, subpath (t, length(d)) of d, i + 1);
+ else:
+ if (arclength(p) > 0) and (arclength(q) > 0):
+ bw1 := 2**w2;
+ currentTubePath := interpath (1/2, q, p);
+ for k := 0 upto bw1:
+ currentPath := interpath (k/bw1, q, p);
+ angleOnTube := arccos(((k/bw1)*2) - 1);
+ currentDepth := -abs((1-sin(angleOnTube))*w0);
+ if shadowsEnabled:
+ currentPath := shadowCut(currentPath, currentDepth);
+ fi;
+ brushGenerate (currentPath,
+ offsetPathTemplate(currentPath, 0)(
+ maxShadingStrokeWidth
+ if odd (k): * (abs(ypart(point offsetPathTime of tubeWidth)/bw1) - 1/2shadingDensity) fi
+ %* orderFade(xpart(unitvector(direction offsetPathTime of tubeWidth yscaled 1/2cos(angleOnTube))), k) % why was it even here?
+ * angleToLightness(
+ tubeAngleToAbsoulteAngle((
+ angleOnTube,
+ angleRad(direction offsetPathTime of currentTubePath),
+ angleRad(direction offsetPathTime of tubeWidth yscaled 1/2)
+ )), currentDepth, point offsetPathTime of currentPath)
+ ), 0);
+ endfor;
+ fi;
+ fi;
+endgroup
+enddef;
+
+%
+% This macro is analogous to tubeGenerate, but draws transverse strokes
+% result is somewhat suboptimal for now, but in simple cases it works ok
+%
+
+def tubeGenerateAlt (expr p, q, d) =
+begingroup
+ save spth, lpth, currentPath, pos, t, pthdir, corr, o, l, i, j, k, tubeAngle, pathAngle, scorr, dt;
+ numeric l[];
+ path spth, lpth, currentPath;
+ pos := 0;
+ j := 0;
+ forever:
+ dt := (xpart(point pos of d) + 1/2shadingDensity);
+ scorr := cosd(angle(direction xpart(d intersectiontimes ((dt, ypart(lrcorner(d))) -- (dt, ypart(urcorner(d))))) of d));
+ t1 := arctime ((arclength(subpath(0, pos) of p)) + shadingDensity/scorr) of p;
+ t2 := arctime ((arclength(subpath(0, pos) of q)) + shadingDensity/scorr) of q;
+ if (arclength(subpath(pos, t1) of p) < arclength(subpath(pos, t1) of q)):
+ pthdir := -1;
+ t3 := t1;
+ else:
+ pthdir := 1;
+ t3 := t2;
+ fi;
+ corr := round(arclength(subpath(pos, t3) of if pthdir = 1: p else: q fi)/(shadingDensity/scorr));
+ if (corr < 1): corr := 1; fi;
+ corr := (arclength(subpath(pos, t3) of if pthdir = 1: p else: q fi) - (corr*(shadingDensity/scorr)))/corr;
+ t3 := arctime (arclength(subpath(0, t3) of if pthdir = 1: q else: p fi) - 1/3corr) of if pthdir = 1: q else: p fi;
+ spth := subpath(pos, t3) of if pthdir = 1: q else: p fi;
+ lpth := subpath(pos, t3) of if pthdir = 1: p else: q fi;
+ tubeAngle := angleRad(direction 1/2[pos, t3] of d);
+ pathAngle := angleRad(direction 1/2 of interpath (1/2, spth, lpth));
+ pos := t3;
+ l1 := round(arclength(lpth)/(shadingDensity/scorr));
+ if (l1 < 1): l1 := 1; fi;
+ l2 := arclength(lpth)/(l1*(shadingDensity/scorr));
+ for i := 0 upto l1 - 1:
+ j := j + 1;
+ k := i*(arclength(lpth)/l1);
+ currentPath := point (arctime k of lpth) of spth -- point (arctime k of lpth) of lpth;
+ currentPath := offsetPathSubdivide(currentPath);
+ brushGenerate (
+ currentPath,
+ offsetPathTemplate(currentPath, 0)(
+ maxShadingStrokeWidth
+ * orderFade(offsetPathLength[1/l1, l2], j)
+ * angleToLightness(
+ tubeAngleToAbsoulteAngle((
+ arccos(pthdir*((offsetPathLength*2)-1)),
+ pathAngle,
+ tubeAngle)
+ ), -2(1/2arclength(currentPath))+sqrt(1 - (2offsetPathLength - 1)**2)*(1/2arclength(currentPath)), point offsetPathTime of currentPath)
+ )
+ , 0);
+ endfor;
+ exitif pos >= length(p);
+ endfor;
+endgroup
+enddef;
+
+%
+% This macro converts some measurements of point on tube to absolute angle.
+% Since there are three such measurements, macro gets them as as a single
+% argument of "color" type, in case it will eventually appear as a result
+% of some other macro.
+%
+
+vardef tubeAngleToAbsoulteAngle (expr p) =
+ save a;
+ numeric a[];
+ a1 := bluepart(p) + 1/2pi;
+ a2 := arccos(cos(redpart(p))*sin(a1));
+ a3 := greenpart(p) + 1/2pi;
+ a4 := arccos((cos(a1) * cos(a3) - cos(a2) * sin(a3))*(99/100));
+ a5 := arccos((cos(a1) * sin(a3) + cos(a2) * cos(a3))*(99/100));
+ (a5, a4)
+enddef;
+
+%
+% frontends to simplify tube drawing. tubeOutline variable changes on every call
+% of any tube frontend function and can be used afterwards.
+%
+
+path tubeOutline;
+boolean drawTubeEnds;
+drawTubeEnds := true;
+
+vardef tube.l (expr p)(text offsetFunction)=
+ save q;
+ path q[];
+ q0 := offsetPathSubdivide(p);
+ q1 := offsetPathTemplate(q0, 0)(offsetFunction);
+ q2 := offsetPathGenerate (q0, q1, 0);
+ q3 := offsetPathGenerate (q0, q1 yscaled -1, 0);
+ tubeOutline := q3--reverse(q2)--cycle;
+ image(
+ tubeGenerate (q2, q3, q1, 0);
+ if (cycle p) or (not drawTubeEnds):
+ draw q2 withpen thinpen;
+ draw q3 withpen thinpen;
+ else:
+ draw q2--reverse(q3)--cycle withpen thinpen;
+ fi;
+ )
+enddef;
+
+vardef tube.t (expr p)(text offsetFunction)=
+ save q;
+ path q[];
+ q0 := offsetPathSubdivide(p);
+ q1 := offsetPathTemplate(q0, 0)(offsetFunction);
+ q2 := offsetPathGenerate (q0, q1, 0);
+ q3 := offsetPathGenerate (q0, q1 yscaled -1, 0);
+ tubeOutline := q3--reverse(q2)--cycle;
+ image(
+ tubeGenerateAlt (q2, q3, q1);
+ if (cycle p) or (not drawTubeEnds):
+ draw q2 withpen thinpen;
+ draw q3 withpen thinpen;
+ else:
+ draw q2--reverse(q3)--cycle withpen thinpen;
+ fi;
+ )
+enddef;
+
+vardef tube.e (expr p)(text offsetFunction)=
+ save q;
+ path q[];
+ q0 := offsetPathSubdivide(p);
+ q1 := offsetPathTemplate(q0, 0)(offsetFunction);
+ q2 := offsetPathGenerate (q0, q1, 0);
+ q3 := offsetPathGenerate (q0, q1 yscaled -1, 0);
+ tubeOutline := q3--reverse(q2)--cycle;
+ if not drawTubeEnds:
+ image(
+ draw q2 withpen thinpen;
+ draw q3 withpen thinpen;
+ )
+ else:
+ tubeOutline := q3--reverse(q2)--cycle;
+ tubeOutline
+ fi
+enddef;
+
+%
+% Sphere can be used as a cap for a tube, so it has same 2**n lines.
+%
+
+vardef sphere.c (expr d) =
+ save currentCircle, origCircle, currentRadius, currentDepth, order, circleThickness;
+ path currentCircle, origCircle;
+ numeric currentRadius, currentDepth, order;
+ origCircle := fullcircle;
+ order := 2**ceiling(log((1/2d)/shadingDensity, 2));
+ image(
+ draw fullcircle scaled d withpen thinpen;
+ for i := 1 upto order:
+ currentRadius := i/order;
+ currentCircle := origCircle scaled (currentRadius*d) rotated uniformdeviate (1/4pi);
+ if odd(i):
+ circleThickness := maxShadingStrokeWidth * ((abs(d - (shadingDensity*order)))/order);
+ else:
+ circleThickness := maxShadingStrokeWidth;
+ fi;
+ currentDepth:= -(1-sqrt(1-currentRadius**2))*(1/2d);
+ if shadowsEnabled:
+ currentCircle := shadowCut(currentCircle, currentDepth);
+ fi;
+ brushGenerate (currentCircle,
+ offsetPathTemplate (currentCircle, 0) (
+ circleThickness
+ * angleToLightness(
+ sphereAngleToAbsoulteAngle(
+ (angleRad(direction offsetPathTime of currentCircle), currentRadius)
+ ), currentDepth, point offsetPathTime of currentCircle
+ )
+ ), 0);
+ endfor;
+ )
+enddef;
+
+%
+% Alternative sphere macro. It's all about latitudinal strokes.
+% The idea is: when we have a sphere with evenly distributed parallel strokes
+% we know how their density rises towards edge in a projection,
+% so all we need to do is to fade lines correspondingly
+%
+
+vardef sphere.l (expr d, lat) =
+ save p, a, x, y, sphlat, latrad, n, c, currentPath, nline, tlat;
+ path p[], currentPath, currentArc;
+ sphlat := 0;
+ nline := 0;
+ latrad := (2pi*lat/360);
+ n := ceiling((pi*1/2d)/shadingDensity);
+ if (cosd(lat) <> 0): tlat := (sind(lat)/cosd(lat)); fi;
+ image(
+ draw fullcircle scaled d withpen thinpen;
+ p0 := fullcircle rotated 90;
+ for nline := 1 upto n-1:
+ sphlat := nline*(pi/n);
+ if (sphlat + latrad < pi) and (sphlat + latrad > 0):
+ if (cosd(lat) <> 0):
+ if (sin(sphlat) <> 0):
+ x := tlat*(cos(sphlat)/sin(sphlat));
+ else:
+ x := 0;
+ fi;
+ else:
+ if ((sphlat > 1/2pi) and (lat > 0)) or ((sphlat < 1/2pi) and (lat < 0)):
+ x := -2;
+ else:
+ x := 2;
+ fi;
+ fi;
+ if (abs(x) <= 1):
+ y := arcsin(x);
+ p1 := subpath(6 + 8y/2pi, 2 - 8y/2pi) of p0;
+ else:
+ p1 := p0;
+ fi;
+ if (x > -1) and (arclength(p1) > 0):
+ currentPath := (p1 scaled (d*sin(sphlat)) yscaled sind(lat)) shifted (0, 1/2d*cos(sphlat)*cosd(lat));
+ currentPath := offsetPathSubdivide(currentPath);
+ brushGenerate(currentPath,
+ offsetPathTemplate(currentPath, 0)(
+ maxShadingStrokeWidth * orderFade(
+ sqrt(1 -
+ abs(
+ ypart(point offsetPathTime of currentPath)/(1/2d),
+ 1 - abs(
+ 1 - abs(
+ xpart(point offsetPathTime of currentPath)
+ /(1/2d)
+ )
+ )**abs(sind(lat))
+ )**2)
+ , nline)
+ * angleToLightness(
+ sphereAngleToAbsoulteAngle((
+ (
+ if (abs(point offsetPathTime of currentPath) > 0):
+ angleRad(point offsetPathTime of currentPath)
+ else:
+ 0
+ fi
+ + 1/2pi), 2abs(point offsetPathTime of currentPath)/(d+1))
+ ), 0, point offsetPathTime of currentPath)
+ ), 0);
+ fi;
+ fi;
+ endfor;
+ )
+enddef;
+
+vardef orderFade (expr v, n)=
+ save o;
+ if (v > 1/256):
+ o := 2**ceiling(log(1/v, 2));
+ if ((n mod 1/2o) = 0):
+ if ((n mod o) = 0):
+ 1
+ else:
+ (v*o) - 1
+ fi
+ else:
+ 0
+ fi
+ else:
+ 0
+ fi
+enddef;
+
+%
+% This one converts point location on sphere to absolute angle
+%
+
+vardef sphereAngleToAbsoulteAngle (expr p) =
+ save a;
+ numeric a[];
+ a1 := xpart(p) - 1/2pi;
+ a2 := arcsin(ypart(p));
+ a3 := arccos(sin(a2)*cos(a1));
+ a4 := pi - arccos(sin(a2)*sin(a1));
+ (a3, a4)
+enddef;
+
+%
+% Once we get two angles at some point of some surface, we can compute light intensity there.
+%
+
+vardef angleToLightness (expr p, d, q) =
+ save returnValue, shiftedShadowPath;
+ path shiftedShadowPath;
+ if shadowsEnabled:
+ for i := 0 step 1 until numberOfShadows:
+ shiftedShadowPath := shadowPath[i] shifted (lightDirectionVector scaled (d-shadowDepth[i]));
+ if q isInside shiftedShadowPath:
+ returnValue := 1;
+ fi;
+ endfor;
+ fi;
+ if not known returnValue:
+ returnValue := (cos(xpart(p) + xpart(lightDirection))++cos(ypart(p) - ypart(lightDirection)));
+ returnValue := angleToLightnessPP(returnValue);
+ fi;
+ if returnValue > 1:
+ 1
+ else:
+ returnValue
+ fi
+enddef;
+
+vardef angleToLightnessPP (expr v) =
+ v**3
+enddef;
+
+% Shadows are global
+
+path shadowPath[];
+numeric shadowDepth[];
+
+% Shadows either require high path resolution, or some points
+% on a path in just the right place for shadows.
+% This macro adds such points.
+
+vardef shadowCut (expr pathToCut, currentDepth)=
+ save shiftedShadowPath, pathShadowIntersection, pathShadowCut, currentPath;
+ path shiftedShadowPath, currentPath;
+ pair pathShadowIntersection;
+ numeric pathShadowCut;
+ currentPath := pathToCut;
+ for j := 0 step 1 until numberOfShadows:
+ shiftedShadowPath := shadowPath[j] shifted (lightDirectionVector scaled (currentDepth - shadowDepth[j]));
+ forever:
+ pathShadowIntersection := shiftedShadowPath firstIntersectionTimes currentPath;
+ pathShadowCut := ypart(pathShadowIntersection);
+ if (pathShadowCut > 1/10) and (pathShadowCut < length(currentPath) - 1/10):
+ currentPath := (subpath (0, pathShadowCut - 1/20) of currentPath) .. (subpath (pathShadowCut + 1/20, length(currentPath)) of currentPath);
+ fi;
+ shiftedShadowPath := subpath (xpart(pathShadowIntersection) + 1/5, length(shiftedShadowPath)) of shiftedShadowPath;
+ exitif (pathShadowCut = -1);
+ endfor;
+ endfor;
+ currentPath
+enddef;
+
+%
+% Several macros rely on cutting offset path template at given height.
+% Taking cutting points closer to the middle gives better results, and that's
+% just what this macro tries to do.
+%
+
+vardef cutPathTime (expr p, h) =
+ save cutTime, d;
+ numeric cutTime[], d[];
+ d1 := xpart(urcorner(p));
+ d2 := xpart(ulcorner(p));
+ if (d2 < d1):
+ d3 := 1/2(d1 + d2);
+ cutTime1 := ypart(((d3, h) -- (d1, h)) firstIntersectionTimes p);
+ cutTime2 := ypart(((d3, h) -- (d2, h)) firstIntersectionTimes p);
+ d4 := xpart (point cutTime1 of p);
+ d5 := xpart (point cutTime2 of p);
+ if abs(d4-d3) < abs(d5-d3):
+ cutTime3 := cutTime1
+ else:
+ cutTime3 := cutTime2
+ fi;
+ else:
+ cutTime3 := -1;
+ fi;
+ cutTime3
+enddef;
+
+%
+% This macro calculates ray angle after refraction. It takes raw angles (one of ray — p and one of surface — q)
+% and refraction indices ratio. Whether ray comes from opticaly denser material is determined by direction of q
+% relative to that of p
+%
+
+vardef refractionAngle (expr p, q, n) =
+ save a;
+ numeric a[];
+ a0 := p - q;
+ if (sin(a0) < 0):
+ a1 := cos(a0 + pi) * n;
+ a2 := pi;
+ else:
+ a1 := cos(a0) / n;
+ a2 := 0;
+ fi;
+ if abs(a1) <= 1:
+ a3 := arccos(a1) + q + a2;
+ else:
+ a3 := -1000;
+ fi;
+ a3
+enddef;
+
+%
+% Same thing for reflection angle, just in case
+%
+
+vardef reflectionAngle (expr p, q) =
+ (2pi - p + 2q)
+enddef;
+
+%
+% This macro returns path of ray 'sa' (which can actually be any path, but only ray from next to last to last point
+% will count) refracted with coef. n through some shape p; if ray can't be refracted and, therefore, totally reflected,
+% it will contunue as reflected from that point. i is total number of refractions to compute;
+%
+
+vardef refractionPathR (expr sa, p, n, i, mn) =
+ save ray, resultRay, d, s, a, iT;
+ path ray, resultRay;
+ pair s, iT;
+ numeric d[], a;
+ s := point (length(sa) - 1) of sa;
+ a := angleRad((point (length(sa)) of sa)-(point (length(sa) - 1) of sa));
+ ray := (s shifted (-dirRad(a) scaled 2)) -- s -- (s shifted (dirRad(a) scaled (abs(llcorner(p)-(urcorner(p))) + abs(s-(center(p))))));
+ if (i > 0): ray := subpath (1 + 1/1000, 2) of ray; fi;
+ iT := ray firstIntersectionTimes p;
+ d1 := xpart(iT);
+ d2 := ypart(iT);
+ d3 := a;
+ d4 := angleRad(direction d2 of p);
+ if (n > 0):
+ d5 := refractionAngle(d3, d4, n);
+ if (d5 < -100) and (d2 >= 0):
+ d5 := reflectionAngle(d3, d4);
+ fi;
+ else:
+ d5 := reflectionAngle(d3, d4);
+ fi;
+ if (d1 >= 0) and (i < mn) and (d5 > -100):
+ resultRay := (subpath (0, length(sa) - 1) of sa) -- refractionPathR(point d2 of p -- (point d2 of p shifted dirRad(d5)), p, n, i + 1, mn);
+ else:
+ if (d5 > -100) or (d1 < 0):
+ resultRay := subpath (0, 1/2) of ray;
+ else:
+ resultRay := subpath (0, d1) of ray;
+ fi;
+ fi;
+ resultRay
+enddef;
+
+vardef refractionPath (expr sa, p, n) =
+ refractionPathR(sa, p, n, 0, 10)
+enddef;
+
+%
+% These macros are for isolines. cLine draws continuous line and is called by isoLines.
+% For now they are only used to draw wood texture, but can be used elsewhere
+%
+
+%
+% isoLines goes through i by j matrix of nodes (xy), looking for square, that has some of it's
+% angles below zero and some - above, when found, it calls cLine, that tries to build segment of
+% isoline, that happen to go through abovementioned square. Thickness of line is
+% controlled by values in v array.
+% All squares with lines already drawn through are ignored.
+%
+
+vardef isoLines (suffix xy)(expr cs, l, s) =
+ save xxyy, i, j, c, v, sqB, iL, lvl;
+ numeric xxyy[][], c[], v[], sqB, sqbM;
+ lvl := l;
+ path iL;
+ image(
+ for i := 0 step 1 until xpart(cs) - 1:
+ for j := 0 step 1 until ypart(cs) - 1:
+ if (unknown xxyy[i][j]):
+ c1 := xy[i][j]+lvl;
+ c2 := xy[i][j+1]+lvl;
+ c3 := xy[i+1][j]+lvl;
+ c4 := xy[i+1][j+1]+lvl;
+ sqB := 0;
+ sqBm := 0;
+ if (abs(sign(c1)+sign(c2)+sign(c3)+sign(c4)) < 4):
+ iL := cLine (xy)((i, j), (0, 0), 0, cs) scaled s;
+ brushGenerate (reverse(iL),
+ offsetPathTemplate(iL, 0)(
+ 1/16minStrokeWidth
+ /(1/64 + 2(
+ if (offsetPathTime < length(iL) - 1):
+ (offsetPathTime - floor(offsetPathTime))
+ [v[floor(sqB + offsetPathTime)],
+ v[ceiling(sqB + offsetPathTime)]]
+ else:
+ 1
+ fi
+ ))
+ )
+ , 0);
+ fi;
+ fi;
+ endfor;
+ endfor;
+ draw (0,0);
+ )
+enddef;
+
+% cLine tries to generate continouos segment of an isoline
+
+vardef cLine (suffix xy)(expr ij, dr, st, cs) =
+ save p, d, dd, n, i, j, k, outputPath, sqS, cp, dp, nd;
+ pair p[], d[], dd[], cp[], dp[];
+ path outputPath;
+ i := xpart(ij);
+ j := ypart(ij);
+ sqS := 0;
+ if (i >= 0) and (i <= xpart(cs)-1) and (j >= 0) and (j <= ypart(cs)-1):
+ n := 0;
+ c1 := xy[i][j] + lvl; d1:= (i, j);
+ c2 := xy[i][j+1] + lvl; d2:= (i, j+1);
+ c3 := xy[i+1][j] + lvl; d3:= (i+1, j);
+ c4 := xy[i+1][j+1] + lvl; d4:= (i+1, j+1);
+ cp1 := (1, 2); dp1 := (-1, 0);
+ cp2 := (1, 3); dp2 := (0, -1);
+ cp3 := (2, 4); dp3 := (0, 1);
+ cp4 := (3, 4); dp4 := (1, 0);
+ for k := 1 upto 4:
+ c5 := c[xpart(cp[k])]; d5 := d[xpart(cp[k])];
+ c6 := c[ypart(cp[k])]; d6 := d[ypart(cp[k])];
+ if (sign(c5)) <> (sign(c6)):
+ n := n + 1;
+ p[n] := (abs(-c5/(c6-c5)))[d5, d6];
+ dd[n] := dp[k];
+ fi;
+ endfor;
+ sqS := max(c1, c2, c3, c4) - min(c1, c2, c3, c4);
+ if (unknown xxyy[i][j]):
+ xxyy[i][j] := 1;
+ if (dr = (0, 0)):
+ outputPath := cLine (xy)(ij shifted dd2, dd2, st + 1,cs) -- p1 -- p2 -- cLine (xy)(ij shifted dd1, dd1, st - 1,cs);
+ else:
+ nd := 0;
+ if (unknown(xxyy[i + xpart(dd1)][j + ypart(dd1)])):
+ nd := 1;
+ elseif (unknown(xxyy[i + xpart(dd2)][j + ypart(dd2)])):
+ nd := 2;
+ fi;
+ if nd > 0:
+ outputPath := cLine (xy)(ij shifted dd[nd], dd[nd], st + sign(st),cs);
+ p3 := p[nd];
+ if (st > 0):
+ outputPath := outputPath -- p3;
+ else:
+ outputPath := p3 -- outputPath;
+ fi;
+ else:
+ outputPath := 1/2[p1, p2];
+ fi;
+ fi;
+ else:
+ outputPath := 1/2[p1, p2];
+ fi;
+ else:
+ outputPath := (i, j);
+ xxyy[i][j] := 1;
+ fi;
+ if (st < sqB): sqB := st; fi;
+ if (st > sqBm): sqBm := st; fi;
+ v[st] := sqS;
+ outputPath
+enddef;
+
+%
+%
+%
+% In following section are gathered all the things for some commonly used
+% real life objects
+%
+%
+%
+
+%
+% Though there's a decent library to deal with geography for mp already
+% (http://melusine.eu.org/lab/bmp/a_mp-geo), here's some basic globe-drawing
+% routine for simple cases, note that latitude starts from the pole,
+% not from the equator (for convenience sake)
+% Below some landmasses are defined
+%
+
+path landmass[];
+landmass1 := (206, 122.33)--(211.07, 116)--(213.3, 109.94)--(218.57, 106.03)--(218.38, 97.36)--(220.28, 91.28)--(229.75, 78.07)--(221.41, 78.29)--(220.78, 76.52)--(218.07, 74.48)--(213.8, 66.08)--(213.38, 62.04)--(222.31, 77.1)--(233.88, 72.27)--(237.79, 68.59)--(234.88, 64.69)--(229.83, 65.57)--(228.98, 64.73)--(227.37, 59.82)--(250.57, 68.12)--(254.63, 80.83)--(257.07, 80.93)--(257.38, 80.52)--(258.64, 75.5)--(266.4, 68.48)--(269.56, 67.49)--(271.88, 70.43)--(272.67, 74.49)--(275.36, 72.94)--(276.87, 78.6)--(276.68, 79.04)--(276.11, 79.28)--(276.3, 80.22)--(276.75, 79.96)--(276.56, 82.38)--(277.05, 82.04)--(280.5, 86.44)--(277.25, 85.56)--(276.55, 88.03)--(279.47, 92.77)--(283.29, 92.25)--(282.68, 90.91)--(283.74, 90.4)--(282.53, 89.58)--(283.03, 88.6)--(278.44, 80.08)--(279.15, 76.64)--(281.08, 78.25)--(282.29, 80.21)--(285.35, 79.72)--(288, 77.83)--(284.21, 71.22)--(287.94, 68.57)--(288, 68.6)--(288.74, 69.82)--(300.09, 61.89)--(300.86, 59.94)--(299.36, 59.63)--(297.64, 55.13)--(301.24, 52.55)--(296.1, 51.5)--(300.45, 49.51)--(299.83, 50.75)--(299.84, 50.82)--(299.44, 51.42)--(303.59, 50.57)--(302.72, 51.9)--(302.96, 52.12)--(304.97, 52.87)--(304.12, 55.13)--(307.89, 53.38)--(306.37, 50.11)--(308.65, 47.92)--(315.01, 45.12)--(319.69, 40.31)--(320.43, 44.25)--(321.66, 44.31)--(323.19, 41.66)--(320.37, 35.59)--(318.47, 37.21)--(315.99, 36.32)--(313.68, 35.16)--(320.43, 31.11)--(332.73, 30.38)--(338.5, 28.24)--(340.91, 28.61)--(334.92, 32.27)--(335, 39.2)--(340.58, 35.32)--(341.69, 32.15)--(340.43, 31.93)--(344.49, 29.68)--(352.49, 28.33)--(355.9, 25.35)--(358.67, 24.01)--(366.1, 25.61)--(368.78, 23.99)--(319.11, 17.34)--(309.82, 19)--(308.23, 18.4)--(307.69, 16.74)--(297.49, 16.63)--(290.61, 13.26)--(285.38, 13.37)--(284.06, 12.79)--(258.59, 16.61)--(260.79, 18.13)--(254.13, 18.01)--(253.53, 17.04)--(252.25, 17.02)--(252.44, 18.56)--(253.69, 19.64)--(251.71, 20.89)--(249.66, 16.97)--(245.54, 19.39)--(236.64, 19.73)--(239.08, 21)--(237.57, 21.46)--(232.4, 21.62)--(232.29, 21.34)--(225.16, 22.27)--(221.!
46, 21.23)--(218.52, 25.09)--(216.81, 24.69)--(214.76, 24.93)--(214.95, 25.52)--(213.66, 25.25)--(211.67, 23.33)--(215.44, 23.49)--(217.75, 21.65)--(200.52, 19.57)--(194.37, 21.1)--(186.19, 26.3)--(183.33, 30.4)--(187.61, 31.42)--(191.44, 33.88)--(194.61, 33.54)--(197.17, 30.74)--(196.08, 28.46)--(196.04, 27.66)--(203.54, 24.58)--(203.45, 24.88)--(200.38, 27.18)--(200.91, 27.54)--(200.05, 29.69)--(199.62, 29.91)--(201.03, 30.25)--(207.36, 29.93)--(205.2, 31.05)--(199.88, 30.97)--(199.94, 31.44)--(200.26, 32.2)--(202.19, 31.76)--(202.85, 32.2)--(199.62, 32.83)--(199.15, 34.61)--(189.46, 35.87)--(189.93, 35.46)--(191.12, 35.08)--(190.83, 34.56)--(188.1, 33.45)--(186.87, 34.75)--(187.11, 36.02)--(176.39, 40.19)--(176.65, 41.24)--(173.41, 42.02)--(176.82, 43.77)--(169.68, 46.56)--(169.15, 53.05)--(171.1, 53.62)--(173.12, 53.39)--(178.7, 51.26)--(183.17, 46.73)--(186.38, 46.75)--(192.72, 49.52)--(191.46, 52.64)--(193.74, 52.83)--(196.74, 50.32)--(190.71, 44.65)--(191.74, 44.4)--(198.11, 50.06)--(198.89, 52.03)--(200.95, 53.75)--(202.49, 51.99)--(201.15, 49.3)--(204.15, 49.28)--(206.54, 53.44)--(214.39, 53.25)--(211.18, 58.75)--(198.36, 57.7)--(197.88, 59.47)--(188.5, 55.87)--(189.63, 53.18)--(189.49, 52.79)--(173.31, 54.75)--(168.56, 58.21)--(161.34, 69.75)--(160.58, 75.18)--(161.25, 77.58)--(162.08, 79.09)--(163.71, 80.23)--(165.04, 82.46)--(168.88, 84.86)--(182.72, 83.77)--(184.88, 85.79)--(187.22, 85.99)--(186.79, 90.34)--(190.56, 95.97)--(190.23, 105.47)--(193.05, 115.74)--(196.18, 121.46)--(196.92, 124.65)--(206, 122.33)--(206, 122.33);
+landmass2 := (111.44, 45.06)--(113.41, 44.75)--(111.77, 46)--(111.77, 46.07)--(118.69, 43.98)--(118.13, 42.88)--(116.49, 43.6)--(114.48, 42.7)--(114.1, 43.65)--(114.04, 41.9)--(113.28, 42.04)--(108.57, 42.18)--(114.57, 39.81)--(120.91, 38.84)--(119.04, 41.38)--(119.53, 41.59)--(122.9, 42.64)--(121.94, 42.77)--(121.82, 43.31)--(124.3, 42.48)--(125.29, 42.37)--(125.59, 41.84)--(125.41, 41.3)--(124.75, 41.38)--(122.58, 40.38)--(122.97, 39.95)--(121.71, 40.06)--(123.02, 38.38)--(121.65, 38.53)--(120.78, 35.69)--(116.8, 33.48)--(114.09, 29.59)--(110.59, 31.42)--(108.79, 28.81)--(104.18, 27.54)--(99.54, 29.42)--(100.85, 30.15)--(100.61, 31.83)--(100.51, 34.6)--(98.7, 35.56)--(99.11, 36.37)--(99.33, 38.41)--(96.3, 36.78)--(85.98, 32.83)--(83.79, 29.73)--(86.02, 28)--(87.63, 26.53)--(92.02, 23.6)--(94.53, 23.9)--(94.57, 23.59)--(95.6, 23.75)--(96.08, 21.63)--(96.05, 20.47)--(99.61, 19.73)--(103.5, 21.33)--(105.9, 22.76)--(103.75, 23.87)--(104.54, 24.37)--(101.78, 25.83)--(112.52, 27.74)--(113.4, 27.33)--(113.39, 27.23)--(110.6, 24.25)--(110.62, 24.18)--(111.27, 23.6)--(116.34, 23.81)--(117.17, 23.3)--(110.5, 21.34)--(111.78, 20.87)--(110.82, 20.4)--(111.3, 20.21)--(109.74, 19.84)--(110.11, 19.43)--(102.09, 17.29)--(97.38, 16.64)--(92.88, 17.67)--(92.21, 18.01)--(91.83, 17.28)--(89.16, 18.82)--(92.76, 20.05)--(93.22, 20.96)--(92.06, 21.98)--(91.69, 22.39)--(88.11, 21.59)--(87.79, 20.91)--(86.11, 20.22)--(86.94, 19.77)--(84.28, 18.1)--(84.81, 17.32)--(85.92, 16.37)--(82.62, 16.82)--(82.26, 18.46)--(82.22, 20.63)--(80.29, 21.42)--(73.81, 21.72)--(73.19, 21.56)--(73.02, 21.15)--(75.97, 21.21)--(75.92, 20.34)--(77.6, 20.64)--(73.05, 17.2)--(70.79, 18.11)--(67.81, 17.27)--(64.31, 17.23)--(54.27, 15.93)--(52.31, 18.03)--(60.06, 17.29)--(60.43, 18.73)--(59.79, 19.06)--(65.44, 20.05)--(71.86, 20.7)--(72.16, 20.95)--(69.43, 21.73)--(70.4, 21.96)--(70.06, 22.49)--(69.48, 22.4)--(63.3, 21.97)--(48.4, 19.77)--(41.64, 20.99)--(22.72, 18.59)--(11.06, 21.67)--(16.58, 23.75)--(14.57, 23.75)--(10.29, 24.54)--(17.36, 25.3)--(17.4!
2, 26.18)--(12.61, 29.54)--(15.96, 29.89)--(15.52, 31.43)--(20.94, 31.31)--(13.31, 35.43)--(16.05, 35.66)--(19.1, 35.11)--(18.12, 34.75)--(27.83, 28.87)--(28.89, 30.18)--(33.87, 29.92)--(33.36, 30.35)--(38.31, 30.44)--(42.27, 33.16)--(42.87, 32.94)--(47.84, 35.37)--(50.85, 39.13)--(53.79, 42.3)--(54.39, 50.26)--(64.16, 61.59)--(63.13, 61.47)--(62.78, 61.95)--(64.93, 63.33)--(66.24, 65.62)--(67.78, 65.49)--(65.67, 61.75)--(65.09, 58.99)--(66.42, 61.44)--(68.81, 63.42)--(72.94, 69.36)--(81.5, 74.4)--(83.61, 73.92)--(85.99, 75.53)--(90.7, 76.75)--(93.55, 80.26)--(95.61, 82.43)--(96.7, 82.3)--(98.47, 82.54)--(101.05, 86.23)--(98.22, 93.14)--(100.55, 101.04)--(102.97, 105.27)--(107.45, 108.16)--(104.04, 132.27)--(104.08, 133.7)--(103.49, 134.62)--(102.5, 136.82)--(104.04, 136.98)--(103.44, 141.15)--(104.17, 143.63)--(108.08, 144.9)--(110.27, 145.35)--(111.35, 145.04)--(113.34, 144.63)--(109.31, 140.79)--(112.69, 137.21)--(111.47, 135.36)--(113.17, 133.67)--(113.34, 130.92)--(116.56, 129.1)--(119.97, 124.37)--(128.41, 119.87)--(133.19, 114.17)--(136.37, 113.08)--(138.56, 109.76)--(141.63, 100.78)--(139.94, 93.61)--(133.56, 91.17)--(129.89, 90.92)--(128.12, 89.29)--(123.75, 83.93)--(119.97, 83.01)--(117.24, 81.38)--(117.85, 80.79)--(116.9, 80.06)--(117.65, 79.02)--(114.24, 79.23)--(110.12, 78.93)--(108.35, 77.69)--(102.27, 80.15)--(102.6, 80.45)--(101.42, 81.66)--(96.3, 80.94)--(95.6, 75.16)--(91.88, 73.8)--(89.69, 73.89)--(91.19, 69.61)--(91.08, 68.3)--(87.73, 69.96)--(81.32, 69.32)--(81.63, 61.96)--(88.41, 60.66)--(88.78, 61.23)--(92.41, 60.31)--(95.93, 65.23)--(96.7, 65.47)--(97.12, 65.14)--(97.12, 59.81)--(100.34, 56.62)--(103.22, 54.85)--(104.21, 50.99)--(106.28, 48.84)--(108.51, 48.83)--(108.23, 48.05)--(111.68, 45.41);
+landmass3 := (309.58, 101.89)--(307.85, 104.82)--(304.23, 104.36)--(301.98, 106.89)--(301.81, 107.2)--(301.39, 106.32)--(297.9, 109.91)--(292.61, 112.27)--(292.42, 116.24)--(291.76, 116.34)--(293.22, 123.3)--(295.54, 125.57)--(300.79, 123.84)--(313.31, 124.74)--(314.35, 125.13)--(314.72, 125.92)--(316.53, 125.74)--(318.45, 127.71)--(324.06, 128.78)--(326.88, 127.94)--(328.82, 125.64)--(331.64, 120.19)--(331.26, 115.24)--(328.34, 111.83)--(327.46, 109.78)--(327.32, 109.75)--(323.91, 106.24)--(320.57, 100.41)--(318.09, 106.52)--(315.29, 105.19)--(314.65, 104.27)--(314.4, 103.64)--(314.38, 101.88)--(314.02, 100.8)--(310.93, 100.72)--(310, 101.21)--(309.58, 101.89);
+landmass4 := (360, 173.94)--(347.31, 173.02)--(337.83, 170.31)--(340.03, 168.66)--(345.63, 168.61)--(346.01, 167.92)--(341.09, 166.89)--(341.61, 165.5)--(343.88, 164.64)--(343.24, 163.51)--(349.37, 161.91)--(322.58, 157.73)--(323.11, 157.14)--(263.4, 156.39)--(263.26, 156.59)--(263.82, 157.03)--(245.18, 163.09)--(245.85, 157.68)--(234.93, 156.8)--(226.52, 156.65)--(194.69, 160.02)--(194.23, 160.12)--(182.27, 160.22)--(175.88, 161.21)--(175.09, 160.92)--(174.87, 161.24)--(171.99, 160.65)--(165.8, 161.33)--(163.91, 162.6)--(161.68, 163.73)--(141.54, 169.39)--(118.58, 172.13)--(116.78, 171.69)--(102.46, 169.67)--(94.78, 168.49)--(97.74, 167.88)--(101.28, 166.75)--(117.86, 164.33)--(118.52, 163.02)--(117.24, 161.46)--(117.41, 160.81)--(114.93, 158.64)--(113.38, 158.53)--(113.67, 158.17)--(112.94, 157.45)--(115.93, 156.83)--(115.81, 156.34)--(116.18, 155.88)--(116.84, 155.67)--(119.7, 154.63)--(119.77, 154.11)--(121.16, 153.99)--(121.76, 153.53)--(116.74, 154)--(113.84, 154.79)--(110.65, 157.28)--(111.18, 157.79)--(111.19, 159.12)--(104.73, 163.13)--(104.3, 163)--(90.27, 162.69)--(86.46, 162.59)--(74.77, 162.74)--(78.14, 164.63)--(64.48, 164.84)--(65.31, 164.46)--(50.04, 164.22)--(50.29, 164.61)--(32.44, 165.76)--(29.52, 166.6)--(27.21, 166.74)--(27.17, 166.97)--(22.41, 166.97)--(23.06, 168.33)--(21.43, 168.63)--(29.78, 169.97)--(27.58, 170.36)--(29.1, 170.81)--(23.15, 171.94)--(24.93, 172.46)--(17.69, 173.06)--(13.37, 172.69)--(3.71, 172.63)--(13.68, 173.98)--(0, 174.21);
+landmass5 := (124.62, 19.08)--(123.98, 19.56)--(126.36, 20.09)--(127.24, 20.59)--(124.98, 23.19)--(130.77, 29.28)--(135.8, 28.99)--(137.84, 25.04)--(141.86, 24.34)--(146.13, 22.18)--(157, 19.51)--(155.91, 17.98)--(155.55, 16.8)--(159.25, 15.48)--(158.44, 14.93)--(159.9, 14.05)--(157.97, 12.46)--(159.52, 10.77)--(159.19, 10.3)--(167.06, 8.42)--(159.95, 8.2)--(156.76, 8.73)--(153.02, 7.87)--(131.44, 7.07)--(130.82, 7.37)--(127.12, 7.44)--(116.94, 8.32)--(111.03, 9.65)--(105.32, 11.75)--(107.03, 12.86)--(108.98, 13.43)--(112.23, 14.12)--(119.83, 14.46)--(121.54, 15.67)--(120.54, 15.91)--(122.91, 16.69)--(121.82, 17.23)--(124.62, 19.08);
+landmass6 := (307.49, 56.47)--(307.06, 57.11)--(308.22, 57.5)--(310.39, 56.79)--(310.75, 57.43)--(312.59, 56.96)--(313.38, 56.17)--(316.84, 55.24)--(317.14, 55.51)--(319.46, 54.34)--(320.21, 51.88)--(320.32, 48.77)--(319.72, 48.29)--(319.35, 47.51)--(322.01, 46.93)--(323.56, 45.58)--(319.79, 44.82)--(319.05, 44.6)--(318.2, 46.06)--(317.67, 48.01)--(318.7, 48.63)--(315.73, 52.34)--(311.83, 54.71)--(307.49, 56.47);
+landmass7 := (172.44, 33.8)--(171.76, 34.44)--(174.73, 35.22)--(173.52, 37.33)--(172.83, 38.17)--(172.56, 39.98)--(179.32, 38.52)--(178.63, 37.06)--(175.74, 33.85)--(176.19, 30.59)--(172.04, 32.2)--(171.52, 33.36)--(172.44, 33.8);
+landmass8 := (222.04, 111.1)--(224.53, 115.35)--(228.6, 106.45)--(226.81, 103.35)--(222.04, 111.1);
+
+%
+% This macro draws contures for a landmass on globe centered on lon,lat
+%
+
+vardef drawLandMass (expr p, lon, lat) =
+ save i, j, k, l, horizon, currentPoint, horizonTimes, outHorizon, inHorizon, visibleContours, pathNumber, horizonArc, arcTimes, resultPath;
+ path resultPath, visibleContours[], horizon, horizonArc;
+ pair currentPoint, horizonTimes[];
+ numeric pathNumber, outHorizon, arcTimes[];
+ horizon := fullcircle scaled 2;
+ pathNumber := 0;
+ outHorizon := -1;
+ inHorizon := -1;
+
+ % In the following loop visible segments of landmass and points of
+ % horizon-crossing are calculated
+ % visibleContours are just what they are called and horizonTimes are
+ % times on horizon circle where visible segment should cross it
+ for i := 0 upto length(p):
+ currentPoint := pointOnGlobe (point i of p, lon, lat);
+ if (horizonOnGlobe (point i of p, lon, lat) < 0):
+ if (unknown visibleContours[pathNumber]):
+ visibleContours[pathNumber] := currentPoint;
+ if (i > 0):
+ outHorizon := xpart(horizon intersectiontimes ((0,0) -- (findHorizonPoint (subpath(i-1, i) of p, lon, lat, 0) scaled 5)));
+ if (outHorizon < inHorizon): outHorizon := outHorizon + 8; fi;
+ horizonTimes[pathNumber - 1] := (inHorizon, outHorizon);
+ fi;
+ else:
+ visibleContours[pathNumber] := visibleContours[pathNumber] -- currentPoint;
+ fi;
+ else:
+ if (known visibleContours[pathNumber]):
+ pathNumber := pathNumber + 1;
+ inHorizon := xpart(horizon intersectiontimes ((0,0) -- (findHorizonPoint (subpath(i, i-1) of p, lon, lat, 0) scaled 5)));
+ fi;
+ fi;
+ endfor;
+ if (unknown visibleContours0):
+ resultPath := (1,0);
+ else:
+ if (unknown visibleContours[pathNumber]): pathNumber := pathNumber - 1; fi;
+ if (unknown horizonTimes[-1]):
+ if (pathNumber > 0):
+ visibleContours0 := visibleContours[pathNumber] -- visibleContours0;
+ fi;
+ pathNumber := pathNumber - 1;
+ else:
+ if (ypart(horizonTimes[-1]) < inHorizon):
+ horizonTimes[pathNumber] := (inHorizon, ypart(horizonTimes[-1]) + 8);
+ else:
+ horizonTimes[pathNumber] := (inHorizon, ypart(horizonTimes[-1]));
+ fi;
+ fi;
+ % In these loops horizon arcs directions should be handled
+ % The idea is that when we have path with no self-intersections arcs should
+ % not cross one another, these conflicts are resolved here
+ % It's important to note, that horizon-time detecting algorithm is
+ % not absolutely precise for now, so at times in will work incorrect.
+ for i := 0 upto pathNumber - 1:
+ for j := i + 1 upto pathNumber:
+ l := 0;
+ for k := -8, 0, 8:
+ if (xpart(horizonTimes[j]) > xpart(horizonTimes[i]) + k) and (xpart(horizonTimes[j]) < ypart(horizonTimes[i]) + k): l := l + 1; fi;
+ if (xpart(horizonTimes[i]) > xpart(horizonTimes[j]) + k) and (xpart(horizonTimes[i]) < ypart(horizonTimes[j]) + k): l := l + 1; fi;
+ endfor;
+ if (l > 1): horizonTimes[j] := (xpart(horizonTimes[j]) + 8, ypart(horizonTimes[j])); fi;
+ endfor;
+ endfor;
+
+ % In the following loop previously calculated segments of a landmass and
+ % arcs of the horizon are sewed together in order
+ resultPath := visibleContours0
+ for i := 1 upto pathNumber + 1:
+ if (known horizonTimes[i-1]): -- (subpath horizonTimes[i-1] of horizon) fi
+ if (i <= pathNumber): -- visibleContours[i] fi
+ endfor
+ fi;
+ resultPath -- cycle
+enddef;
+
+% This thing just converts coordinates on globe rotated by lon, lat to screen coordinates
+
+vardef pointOnGlobe (expr p, lon, lat) =
+ (cosd(lon + xpart(p)) * sind(ypart(p)),
+ cosd(ypart(p)) * cosd(lat)
+ + sind(lon + xpart(p)) * sind(ypart(p)) * sind(lat))
+enddef;
+
+% This one is needed to check if point on globe is in view
+
+vardef horizonOnGlobe (expr p, lon, lat) =
+ (sind(lon + xpart(p)) * cosd(lat) * sind(ypart(p))) - (cosd(ypart(p)) * sind(lat))
+enddef;
+
+% This macro calculates horizon crossing point with given precision (recursion depth).
+% Likely, this could be done analytically, though.
+
+vardef findHorizonPoint (expr p, lon, lat, i) =
+ save selecthalf, returnpoint;
+ pair selecthalf, returnpoint;
+ if (horizonOnGlobe (point 1/2 of p, lon, lat) < 0):
+ selecthalf := (0, 1/2);
+ else:
+ selecthalf := (1/2, 1);
+ fi;
+ if (i < 5):
+ returnpoint := findHorizonPoint (subpath selecthalf of p, lon, lat, i + 1)
+ else:
+ returnpoint := pointOnGlobe (point 1/2 of p, lon, lat);
+ fi;
+ returnpoint
+enddef;
+
+vardef globe (expr s, lon, lat) =
+ save i, p, lm;
+ picture p[];
+ path lm;
+ begingroup
+ save angleToLightnessPP;
+ vardef angleToLightnessPP (expr v) =
+ 1/2(v**3)
+ enddef;
+ p1 := image(draw sphere.l(2s, lat));
+ vardef angleToLightnessPP (expr v) =
+ if (abs(cos(sphlat)) > 7/8 + uniformdeviate (1/20)):
+ 1/4(v**2)
+ else:
+ 1/3(v**2) + 2/3
+ fi
+ enddef;
+ p2 := image(draw sphere.l(2s, lat));
+ endgroup;
+ image(
+ draw fullcircle scaled 2s withpen thinpen;
+ for i := 1 upto 8:
+ lm := drawLandMass(landmass[i], lon + 90, lat) scaled s;
+ p3 := p2;
+ clip p3 to lm;
+ draw p3;
+ thinBrushGenerate (lm,
+ offsetPathTemplate (lm, 0) (
+ 2/3minStrokeWidth + 1/3minStrokeWidth
+ * angleToLightness(
+ sphereAngleToAbsoulteAngle(
+ (angleRad(point offsetPathTime of lm) + 1/4pi, abs(point offsetPathTime of lm)/2s)
+ ), 0, point offsetPathTime of lm
+ )
+ ), 0);
+ p1 := p1 maskedWith lm;
+ endfor;
+ draw p1;
+ )
+enddef;
+
+%
+% This macro draws an eye pointed in the direction a (in degrees)
+% Eye is opened at random angle and pupil is scaled randomly by design
+% Scaling below some level, dependent on minStrokeWidth, simplifies image
+%
+
+eyescale := 1/2cm;
+
+vardef eye (expr a) =
+ save s, eyelids, pupil, eyeball, eyelash, loopstep, p, o;
+ path eyelids[], pupil[], eyelash;
+ pair p[];
+ picture eyeball;
+ numeric s, loopstep;
+ o := 10 + (15/(1 + 2**(3/2normaldeviate)));
+ s := eyescale;
+ p1 := (-3/4s, 0);
+ pupil1 := ((subpath (-2, 2) of fullcircle xscaled 3/5) .. (subpath (3, 5) of fullcircle xscaled 2/5) .. cycle) scaled 3/5s;
+ pupil2 := fullcircle scaled (1/3s + uniformdeviate(1/5s)) xscaled 1/3;
+ p2 := ((p1 -- ((1/2s, 0) rotatedabout (p1, o - 5))) intersectionpoint (subpath (0, 4) of pupil1));
+ eyelids1 := (p1 shifted (0, -1/16s)){dir(1/3o)} .. {dir(0)}p2;
+ eyelids2 := p1 {dir(-1/3o)} .. {dir(0)}((1/6s, 0) rotatedabout (p1, -2/3o - 5));
+ eyelids2 := subpath(xpart(eyelids2 intersectiontimes eyelids1), length(eyelids2)) of eyelids2;
+ eyelids3 := (p1){dir(2/3o)} .. tension 3/2 .. {dir(o-1/3o)}p2 rotatedabout (p1, 1/3o + 7);
+ eyelids3 := subpath (1/8, length(eyelids3)) of eyelids3;
+ eyelids4 := (p1 shifted (0, -1/16s)) .. {dir(1/4o - 2/3o)}((1/6s, -1/6s) rotatedabout (p1, -2/3o - 5));
+ eyelids4 := subpath (1/2, length(eyelids4)) of eyelids4;
+ loopstep := length(eyelids1)/20;
+ if (arclength(subpath(0, loopstep) of eyelids1) < 5minStrokeWidth):
+ loopstep := arctime (5minStrokeWidth) of eyelids1;
+ fi;
+ eyeball := image(
+ if (5loopstep <= 1):
+ draw pupil1 withpen thinpen;
+ fill pupil2;
+ for i := 0 step 5loopstep until length pupil1:
+ draw brush ((point i of pupil1) -- (point i + 6 of pupil2 scaled 5/6 yscaled 1/2))(cos(offsetPathLength*1/2pi)*2minStrokeWidth);
+ endfor;
+ else:
+ fill pupil1;
+ fi;
+ );
+ clip eyeball to (eyelids1{(1, 0)} .. (s, 0) .. {-1, 0}reverse(eyelids2) -- cycle);
+ eyeball := eyeball maskedWith ((fullcircle scaled (1/4s) xscaled 1/2 rotated 2 shifted (1/12s, 0) rotatedabout (p1, 1/3o + 2)));
+ image(
+ draw brush (eyelids1 .. tension 2.5 .. reverse (eyelids3))((1-offsetPathLength)*2minStrokeWidth);
+ draw brush (eyelids2)((offsetPathLength)*2minStrokeWidth);
+ draw brush (eyelids4)(sin(offsetPathLength*pi)*minStrokeWidth);
+ draw eyeball;
+ for i := length(eyelids1) step -loopstep until 0:
+ eyelash := (point i of eyelids1) {dir(angle(direction i of eyelids1) - 60 + 50*(i/length(eyelids1)))}
+ .. (point i of eyelids1) shifted (1/16s + (i/length(eyelids1))*1/4s, (i/length(eyelids1))*1/5s);
+ if (arclength(eyelash) > 2/3minDashStrokeLength):
+ draw brush (eyelash shifted ((-1/32s, uniformdeviate(1/12s)) scaled ((length(eyelids1)-i)/length(eyelids1))) )(minStrokeWidth + (1-offsetPathLength)*minStrokeWidth);
+ fi;
+ endfor;
+ for i := length(eyelids2) step -3/2loopstep until 0:
+ eyelash := (point i of eyelids2) {dir(angle(direction i of eyelids2) + 20 - 40*(i/length(eyelids2)))}
+ .. (point i of eyelids2) shifted (1/16s + (i/length(eyelids2))**2*1/7s, 1/16s - (i/length(eyelids2))*1/5s);
+ if (arclength(eyelash) > minDashStrokeLength):
+ draw brush (eyelash shifted (-1/32s, -uniformdeviate(1/24s)))(minStrokeWidth + (1-offsetPathLength)*minStrokeWidth);
+ fi;
+ endfor;
+ ) if cosd(a) < 0: yscaled -1 rotated (a) else: rotated a fi
+enddef;
+
+%
+% This macro draws solid surface
+%
+
+vardef solidSurface (expr p) =
+ save q, s, d, stripes;
+ path q, s;
+ picture stripes;
+ q := offsetPath(p) (-1/4cm);
+ s := p -- reverse(q) -- cycle;
+ image(
+ draw solid (s, 45, 0);
+ draw p withpen thinpen;
+ )
+enddef;
+
+vardef solid (expr p, a, t) =
+ save stripes, stripeskind, d, i, j, c;
+ picture stripes, stripeskind;
+ pair c;
+ stripes := image(
+ d1 := abs(ulcorner(p rotated (90 - a)) - urcorner(p rotated (90 - a)));
+ d2 := abs(ulcorner(p rotated (90 - a)) - llcorner(p rotated (90 - a)));
+ stripeskind := dashpattern (on 1mm);
+ c := 1/2[ulcorner(p rotated (90 - a)), lrcorner(p rotated (90 - a))] rotated (a - 90);
+ for i:= 0 step (3/2shadingDensity)/d1 until 1:
+ if (t = 1):
+ j := round(i*d1/(3/2shadingDensity));
+ if (j mod 4) = 0:
+ stripeskind := dashpattern (on 8shadingDensity off 4shadingDensity);
+ fi;
+ if ((j mod 4) = 1) or ((j mod 4) = 3):
+ stripeskind := dashpattern (off 1shadingDensity on 6shadingDensity off 5shadingDensity);
+ fi;
+ if (j mod 4) = 2:
+ stripeskind := dashpattern (on 0 off 12shadingDensity);
+ fi;
+ fi;
+ draw ((dir(a) scaled 1/2d2) -- (dir(a + 180) scaled 1/2d2)) shifted c shifted i[dir(a + 90) scaled 1/2d1, dir(a -90) scaled 1/2d1] withpen thinpen
+ dashed stripeskind;
+ endfor;
+ );
+ clip stripes to p;
+ stripes
+enddef;
+
+%
+% Returns a picture of shaded gradient inside shape p at an angle a
+%
+
+vardef gradientShade (expr p, a) =
+ save stripes, stripeshd, d, i, j, s;
+ picture stripes;
+ path s;
+ stripes := image(
+ d1 := abs(ulcorner(p rotated (90 - a)) - urcorner(p rotated (90 - a)));
+ d2 := abs(ulcorner(p rotated (90 - a)) - llcorner(p rotated (90 - a)));
+ for i:= 0 step (shadingDensity)/d1 until 1:
+ s := ((dir(a) scaled 1/2d2) -- (dir(a + 180) scaled 1/2d2)) shifted 1/2[ulcorner(p), lrcorner(p)] shifted i[dir(a + 90) scaled 1/2d1, dir(a -90) scaled 1/2d1];
+ stripeshd := 1/4 + 3/4i;
+ draw brush(s)(minStrokeWidth*stripeshd);
+ endfor;
+ );
+ clip stripes to p;
+ stripes
+enddef;
+
+%
+% This one draws a spring between points p and q with n steps
+% if stretched more than possible, displayed as a straight line
+% if compressed too much, displayed as having less steps
+%
+
+springwidth := 1/8cm;
+
+vardef spring (expr p, q, n) =
+ save sp, ss, t, x, springstep, springcoef, springsegment;
+ transform t;
+ path ss[];
+ pair sp;
+ picture springsegment;
+ springstep := (arclength(p--q) - 2springwidth)/(n+1);
+ if (springstep < 6minStrokeWidth): springstep := arclength(p--q)/round(arclength(p--q)/6minStrokeWidth); fi;
+ if (springstep < (springwidth*pi)):
+ springcoef := (1-(springstep/(springwidth*pi)));
+ else:
+ springcoef := 0;
+ fi;
+ image(
+ for i := 0 step 30 until 360:
+ sp := ((cosd(i - 90), sind(i - 90)) scaled springwidth xscaled 1/4 yscaled springcoef) shifted (springstep*(i/360) - 1/2springstep, 0);
+ if (i = 0):
+ ss1 := sp;
+ else:
+ ss1 := ss1 -- sp;
+ fi;
+ endfor;
+ ss2 := subpath (0, 6) of ss1;
+ ss3 := subpath (6, 12) of ss1;
+ ss4 := subpath (0, ypart(ss2 shifted (-3minStrokeWidth, 0) intersectiontimes ss3)) of ss3;
+ x := ypart(ss2 shifted (3minStrokeWidth, 0) intersectiontimes ss3);
+ if (x > 0):
+ ss5 := subpath (x, length(ss3)) of ss3;
+ else:
+ ss5 := point length(ss3) of ss3;
+ fi;
+ if (xpart(llcorner(ss4)) - 3minStrokeWidth < xpart(urcorner(ss2 shifted (-springstep, 0)))):
+ x := ypart((subpath (3, 6) of ss2 shifted (-springstep + 3minStrokeWidth, 0)) intersectiontimes ss4);
+ if (x > 0):
+ ss6 := subpath (0, x) of ss4;
+ else:
+ ss6 := point 0 of ss4;
+ fi;
+ x := ypart((subpath (0, 3) of ss2 shifted (-springstep + 3minStrokeWidth, 0)) intersectiontimes ss4);
+ if (x > 0):
+ ss7 := subpath (x, length(ss4)) of ss4;
+ else:
+ ss7 := point length(ss4) of ss4;
+ fi;
+ fi;
+ springsegment := image(
+ draw brush (ss2)(minStrokeWidth + sin(offsetPathLength*pi)*minStrokeWidth);
+ if (unknown(ss6)):
+ if (arclength(ss4) > minStrokeWidth): draw ss4 withpen thinpen; fi;
+ else:
+ if (arclength(ss6) > minStrokeWidth): draw ss6 withpen thinpen; fi
+ if (arclength(ss7) > minStrokeWidth): draw ss7 withpen thinpen; fi
+ fi;
+ if (arclength(ss5) > minStrokeWidth): draw ss5 withpen thinpen; fi;
+ );
+ ss8 := (ss2 shifted (-2minStrokeWidth, 0)) rotated angle(q-p) shifted ((springwidth + 1/2springstep)/arclength(p--q))[p, q];
+ for i := springwidth + 1/2springstep step springstep until arclength(p--q) - springwidth - 1/2springstep + 1:
+ t := identity rotated angle(q-p) shifted (i/arclength(p--q))[p, q];
+ draw springsegment transformed t;
+ if (i <= springwidth + 1/2springstep + 2/3springwidth):
+ ss9 := ss3 transformed t;
+ ss10 := subpath (
+ xpart(ss9 intersectiontimes (subpath (0, 3) of ss8)),
+ xpart(ss9 intersectiontimes (subpath (3, 6) of ss8))
+ ) of ss9;
+ if (arclength(ss10) > minStrokeWidth): draw ss10 withpen thinpen; fi;
+ fi;
+ endfor;
+ draw brush (((springwidth)/arclength(p--q))[p, q] shifted (dir(angle(p-q) + 90)*springwidth * springcoef){(p-q)} .. {(p-q)}p)(minStrokeWidth);
+ draw brush (((springwidth)/arclength(p--q))[q, p] shifted (dir(angle(p-q) + 90)*springwidth * springcoef){(q-p)} .. {(q-p)}q)(minStrokeWidth);
+ )
+enddef;
+
+%
+% This macro draws some kind of weight. Not very nice one at the moment
+%
+
+vardef weight.h (expr h) =
+ save auricle, q, r;
+ path q[];
+ auricle.d := 2mm;
+ auricle.t := 2shadingDensity;
+ r := 2/5(h-auricle.d);
+ image(
+ q0 := offsetPathSubdivide((0, -h) -- (0, -auricle.d - 1/6h));
+ q1 := offsetPathTemplate(q0, 0)(r-(offsetPathLength*(1/8r)));
+ q2 := offsetPathGenerate (q0, q1, 0);
+ q3 := offsetPathGenerate (q0, q1 yscaled -1, 0);
+ tubeGenerate (q2, q3, q1, 0);
+ draw reverse(q2) -- q3 withpen thinpen;
+ q0 := offsetPathSubdivide((0, -auricle.d - 1/6h) -- (0, -auricle.d));
+ q1 := offsetPathTemplate(q0, 0)(2/8r + 5/8r*(sqrt(1-offsetPathLength**2)));
+ q2 := offsetPathGenerate (q0, q1, 0);
+ q3 := offsetPathGenerate (q0, q1 yscaled -1, 0);
+ tubeGenerateAlt (q2, q3, q1);
+ draw q3 -- reverse(q2) withpen thinpen;
+ q5 := offsetPathSubdivide(point 0 of q3 -- point 0 of q2);
+ q6 := tube.e((0,0) -- (0, -3/2auricle.t))(1/2auricle.t);
+ draw image(
+ q4 := (((0, -1/2) {dir(90)} .. (1/2, 1/2) .. (0, 1) .. {dir(-90)}(-1/2, 1/4)) shifted (0, -1)) scaled 2/3auricle.d;
+ draw shadedEdge(tube.e(q4) (1/4auricle.t)) shifted (0, -1/2auricle.t);
+ ) maskedWith (q3 -- reverse(q2) -- (q2 yscaled 0 shifted (0, -h)) -- (reverse(q3) yscaled 0 shifted (0, -h)) -- cycle)
+ maskedWith q6;
+ draw shadedEdge(q6);
+ thinBrushGenerate (q5,
+ offsetPathTemplate (q5, 0) (
+ minDashStrokeWidth + minStrokeWidth
+ * angleToLightness(
+ (arccos(1 - offsetPathLength*2), 1/2pi)
+ , 0, point offsetPathTime of q5
+ )
+ ), 0);
+ )
+enddef;
+
+vardef weight.s (expr h) =
+ save q,r;
+ path q[];
+ r := 2/5h;
+ image(
+ q0 := offsetPathSubdivide((0, 0) -- (0, h-2/3r));
+ q1 := offsetPathTemplate(q0, 0)(r);
+ q2 := offsetPathGenerate (q0, q1, 0);
+ q3 := offsetPathGenerate (q0, q1 yscaled -1, 0);
+ tubeGenerate (q2, q3, q1, 0);
+ draw reverse(q2)--q3 withpen thinpen;
+ q0 := offsetPathSubdivide((0, h-2/3r) -- (0, h - 1/8r));
+ q1 := offsetPathTemplate(q0, 0)(r-sqrt(1- (1- offsetPathLength*2)**2)*1/3r - 1/6r*offsetPathLength);
+ q2 := offsetPathGenerate (q0, q1, 0);
+ q3 := offsetPathGenerate (q0, q1 yscaled -1, 0);
+ tubeGenerateAlt (q2, q3, q1);
+ draw q2 withpen thinpen;
+ draw q3 withpen thinpen;
+ q0 := offsetPathSubdivide((0, h-1/8r) -- (0, h));
+ q1 := offsetPathTemplate(q0, 0)((r-1/6r)+sqrt(1- (1- offsetPathLength*2)**2)*1/16r);
+ q2 := offsetPathGenerate (q0, q1, 0);
+ q3 := offsetPathGenerate (q0, q1 yscaled -1, 0);
+ tubeGenerateAlt (q2, q3, q1);
+ draw q2 --reverse(q3) withpen thinpen;
+ )
+enddef;
+
+%
+% This macro makes a lens-shaped clockwise path with radii
+% r = (left radius, right radius), thickness t and diameter d
+%
+
+vardef lens (expr r, t, d, s) =
+ save p, q, m, c;
+ pair c[];
+ path p[], q[];
+ if (xpart(r) = infinity):
+ p1 := (0, d) -- (0, -d);
+ else:
+ p1 := subpath (2, 6) of fullcircle scaled 2xpart(r);
+ fi;
+ if (ypart(r) = infinity):
+ p2 := (0, d) -- (0, -d);
+ else:
+ p2 := subpath (-2, 2) of fullcircle scaled 2ypart(r);
+ fi;
+ q1 := (min(xpart(ulcorner(p1)), xpart(ulcorner(p2))) - 1, -1/2d)--(max(xpart(urcorner(p1)), xpart(urcorner(p2))) + 1,-1/2d);
+ q2 := q1 shifted (0, d);
+ q3 := q1 shifted (0, 1/2d);
+ c1 := p1 intersectiontimes q1;
+ c2 := p1 intersectiontimes q2;
+ c3 := p2 intersectiontimes q2;
+ c4 := p2 intersectiontimes q1;
+ if (xpart(c1) > 0):
+ p1 := subpath (xpart(c1), xpart(c2)) of p1;
+ fi;
+ if (xpart(c3) > 0):
+ p2 := subpath (xpart(c3), xpart(c4)) of p2;
+ fi;
+ p1 := p1 shifted (-xpart(point xpart(p1 intersectiontimes q3) of p1), 0);
+ p2 := p2 shifted (-xpart(point xpart(p2 intersectiontimes q3) of p2) + t, 0);
+ reverse(p1--p2--cycle) scaled s
+enddef;
+
+%
+% This one returns a picture of a pulley with diameter d and it's support rotated
+% at angle a. pulleyOutline path changes every time
+%
+
+path pulleyOutline;
+numeric pulleySupportSize;
+pulleySupportSize := 2/3;
+
+vardef pulley (expr d, a) =
+ save pw, p, r;
+ picture pw;
+ path p[];
+ r1 := 3/5d;
+ r2 := 1/6d;
+ image(
+ p0 := fullcircle scaled d;
+ p1 := (subpath (3, 9) of fullcircle) scaled r1;
+ p0 := subpath (
+ xpart(p0 intersectiontimes ((point 0 of p1) -- (point 0 of p1 shifted (0, d)))),
+ 8 + xpart(p0 intersectiontimes ((point 0 of reverse(p1)) -- (point 0 of reverse(p1) shifted (0, d)))))
+ of p0;
+ p0 := ((xpart(point 0 of reverse(p0)), pulleySupportSize*d) -- (xpart(point 0 of p0), pulleySupportSize*d) -- p0 -- cycle) rotated a;
+ pulleyOutline := p0;
+ p1 := (p1 -- (xpart(point 0 of reverse(p1)), pulleySupportSize*d) -- (xpart(point 0 of p1), pulleySupportSize*d) -- cycle) rotated a;
+ pw := pulleyWheel(d) maskedWith p1;
+ draw pw;
+ draw p1 withpen thinpen;
+ draw shadedEdge(reverse(fullcircle) scaled r2);
+ )
+enddef;
+
+vardef pulleyWheel (expr d) =
+ save pw, r, i;
+ picture pw;
+ r1 := 7/9d;
+ r2 := 8/9d;
+ r3 := 3/5d;
+ r4 := 1/8d;
+ if (r2-r1) > shadingDensity:
+ pw := image(
+ for i := r3 step 2shadingDensity until r2:
+ if (i <= r1) or (i >= r2):
+ thinBrushGenerate (fullcircle scaled i,
+ offsetPathTemplate (fullcircle scaled i, 0) (
+ 2/3minStrokeWidth + minStrokeWidth
+ * angleToLightness(
+ sphereAngleToAbsoulteAngle(
+ (angleRad(direction offsetPathTime of fullcircle), i/4d)
+ ), 0, point offsetPathTime of fullcircle scaled i
+ )
+ ), 0);
+ else:
+ thinBrushGenerate (fullcircle scaled i,
+ offsetPathTemplate (fullcircle scaled i, 0) (
+ 1/4minStrokeWidth + minStrokeWidth
+ * angleToLightness(
+ sphereAngleToAbsoulteAngle(
+ (angleRad(direction offsetPathTime of fullcircle) + pi, 1/2)
+ ), 0, point offsetPathTime of fullcircle scaled i
+ )
+ ), 0);
+ fi;
+ endfor;
+ draw brush (fullcircle scaled r1)(minStrokeWidth);
+ draw brush (fullcircle scaled r2)(minStrokeWidth);
+ draw fullcircle scaled d withpen thinpen;
+ draw fullcircle scaled r3 withpen thinpen;
+ draw shadedEdge(reverse(fullcircle) scaled r4);
+ );
+ else:
+ pw := image(
+ draw shadedEdge (reverse(fullcircle) scaled r1);
+ draw fullcircle scaled d withpen thinpen;
+ draw fullcircle scaled r4 withpen thickpen;
+ )
+ fi;
+ pw
+enddef;
+
+%
+% This macro draws a wheel
+%
+
+vardef wheel (expr d, a) =
+ save pc, p, r, i;
+ picture pc[];
+ path p[];
+ r1 := 2/8d;
+ r2 := d-6minStrokeWidth;
+ r3 := 7/8d-2shadingDensity;
+ if r1 > 3shadingDensity:
+ pc1 := image(
+ for i := r1 step 2shadingDensity until r3:
+ thinBrushGenerate (fullcircle scaled i,
+ offsetPathTemplate (fullcircle scaled i, 0) (
+ 2/3minStrokeWidth + minStrokeWidth
+ * angleToLightness(
+ sphereAngleToAbsoulteAngle(
+ (angleRad(direction offsetPathTime of fullcircle) + pi, i/4d)
+ ), 0, point offsetPathTime of fullcircle scaled i
+ )
+ ), 0);
+ endfor;
+ draw sphere.c(r1);
+ draw shadedEdge (reverse(fullcircle) scaled r3);
+ );
+ else:
+ pc1 := image(
+ draw shadedEdge (fullcircle scaled d);
+ draw shadedEdge (fullcircle scaled r1);
+ draw shadedEdge (reverse(fullcircle) scaled r2);
+ );
+ fi;
+ pc2 := image(fill fullcircle scaled d;) maskedWith (fullcircle scaled r2);
+ pc3 := image(
+ p1 := reverse((1/3d, 1/4d) -- (-1/3d, 1/4d) -- (-1/2d, 1/2d) -- (1/2d, 1/2d) -- cycle) rotated a;
+ draw p1 withpen thinpen;
+ draw gradientShade(p1, 180);
+ );
+ pc3 := pc3 maskedWith (fullcircle scaled d);
+ image(
+ draw pc1;
+ draw pc2;
+ draw pc3;
+ )
+enddef;
+
+%
+% These macros are for drawing wood texture. A bunch of wood-related global
+% variables are also here.
+%
+
+woodBlockRes := 1/3mm;
+woodBlockDetail := 1/5;
+woodBlockYRdensity := 1/24;
+woodKnotAngle := 1/3pi;
+woodKnotRadius := 1/8cm;
+woodKnotDensity := 2cm;
+
+% wField returns a value on a scalar field, that is surface of year ring
+
+vardef wField (suffix wk)(expr i, j, cs, nwk)=
+ save x, y, csx, csy, ba, a, r, outputValue, k, bd;
+ csx := xpart(cs);
+ csy := ypart(cs);
+ x := i*woodBlockDetail;
+ y := j*woodBlockDetail;
+ bd := 1/2(woodKnotRadius/woodBlockRes)*woodBlockDetail;
+ outputValue := 0;
+ for k := 0 upto nwk:
+ r := (abs(((x, y) shifted -wk[k]) yscaled (sin(woodKnotAngle))));
+ a := angleRad((x, y) shifted -wk[k]);
+ if (r >= 2bd) and (1/2r-bd < 8):
+ outputValue := outputValue + ((sqrt(1/2r-bd)/(3**(1/2r-bd)))*(sin(woodKnotAngle)*(1/2sin(-a)) + 1)*(1/3 + 2/3abs(cos(a))))**2;
+ elseif (r < 2bd):
+ outputValue := outputValue - 10sqrt(1-(r/2bd)**4);
+ fi;
+ outputValue := outputValue + 1/64cos(2pi*1/30r);
+ endfor;
+ outputValue := outputValue - (i*woodBlockYRdensity)/5 + 1/32sin(pi*i/xpart(cs) + 4pi*j/ypart(cs));
+ outputValue
+enddef;
+
+% woodBlock generates coordinates of knots, calls wField to
+% generate matrix of heights (one for all years, that's simplification, of course)
+% and then calls isoLines for each year ring (shifting values in matrix by woodBlockYRdensity)
+
+vardef woodBlock (expr w, l) =
+ save wood, wKnot, nwKnot, p, q, i, j, k, cl, tr, wS, lS;
+ numeric wood[][];
+ pair wKnot[];
+ path q;
+ picture p;
+ if (l > w):
+ wS := round(w/woodBlockRes);
+ lS := round(l/woodBlockRes);
+ else:
+ wS := round(l/woodBlockRes);
+ lS := round(w/woodBlockRes);
+ fi;
+ image(
+ p := image(
+ i := -1;
+ j := 0;
+ forever:
+ wKnot[-1] := (uniformdeviate(wS*woodBlockDetail + woodKnotRadius*woodBlockDetail/woodBlockRes), uniformdeviate(lS*woodBlockDetail + woodKnotRadius*woodBlockDetail/woodBlockRes)) shifted (-1/2woodKnotRadius*woodBlockDetail/woodBlockRes, -1/2woodKnotRadius*woodBlockDetail/woodBlockRes);
+ cl := 0;
+ if (i > -1):
+ for k := 0 step 1 until i:
+ if (woodBlockRes*abs(wKnot[k]-wKnot[-1])/woodBlockDetail) < woodKnotDensity:
+ cl := 1;
+ fi;
+ endfor;
+ fi;
+ if cl > 0:
+ j := j + 1;
+ else:
+ i := i + 1;
+ wKnot[i] := wKnot[-1];
+ for tr := 2woodKnotRadius step -8minStrokeWidth until 2minStrokeWidth:
+ draw brush(
+ ((fullcircle scaled tr yscaled (1/sin(woodKnotAngle))) shifted (woodBlockRes*wKnot[i]/woodBlockDetail))
+ )(
+ minStrokeWidth*(1/2+abs(sin(woodKnotAngle))*abs(sin(angleRad(point offsetPathTime of fullcircle))))
+ );
+ endfor;
+ fi;
+ exitif (j >= 10) or (i >= 1/2((w/cm)*(l*cm))/(woodKnotDensity/cm));
+ endfor;
+ nwKnot := i;
+ for i := 0 step 1 until wS:
+ k := uniformdeviate(1/8woodBlockYRdensity);
+ for j := 0 step 1 until lS:
+ wood[i][j] := wField (wKnot)(i, j, (wS, lS), nwKnot) + k;
+ endfor;
+ endfor;
+ for i := -wS/(80woodBlockYRdensity) - 2 upto wS/(80woodBlockYRdensity) + 2:
+ draw isoLines(wood)((wS, lS), woodBlockYRdensity*i + uniformdeviate(1/8woodBlockYRdensity), woodBlockRes);
+ endfor;
+ );
+ q := (0, 0) -- (w, 0) -- (w, l) -- (0, l) -- cycle;
+ if (w > l): q := q xscaled -1 rotated -90; fi;
+ clip p to q;
+ draw p;
+ draw q withpen thinpen;
+ ) if (l < w): xscaled -1 rotated -90 fi
+enddef;
+
+% woodenThing fits a woodBlock into thingOutline at a given woodAngle
+
+vardef woodenThing (expr thingOutline, woodAngle) =
+ save shiftedThing, thingOrigin, thingWoodBlock;
+ path shiftedThing;
+ pair thingOrigin;
+ picture thingWoodBlock;
+ shiftedThing := thingOutline rotated -woodAngle;
+ thingOrigin := llcorner(shiftedThing);
+ shiftedThing := shiftedThing shifted -thingOrigin;
+ thingWoodBlock := woodBlock(xpart(urcorner(shiftedThing)), ypart(urcorner(shiftedThing)));
+ clip thingWoodBlock to shiftedThing;
+ thingWoodBlock := (thingWoodBlock shifted thingOrigin) rotated woodAngle;
+ image(
+ draw thingOutline withpen thinpen;
+ draw thingWoodBlock;
+ )
+enddef;
+
+%
+% This part is related to knots
+%
+
+% lists are only used in knots so far.
+% The following two macros are taken from byrne.mp
+
+vardef appendList@#(suffix listName)(expr valueToAdd, whereToAdd, omitDuplicates) =
+ save v, valueExists;
+ string v;
+ boolean valueExists;
+ valueExists := false;
+ if str @# = "":
+ if not string listName:
+ string listName;
+ fi;
+ else:
+ if not string listName0:
+ string listName[];
+ fi;
+ fi;
+ if unknown listName@#:
+ listName@# := "";
+ fi;
+ if omitDuplicates:
+ for i=scantokens(listName@#):
+ if (i = valueToAdd):
+ valueExists := true;
+ fi;
+ endfor;
+ fi;
+ if not valueExists:
+ if string valueToAdd:
+ v := valueToAdd;
+ else:
+ v := decimal(valueToAdd);
+ fi;
+ if length(listName@#) = 0:
+ listName@# := v;
+ else:
+ if (whereToAdd = 1):
+ listName@# := listName@# & ", " & v;
+ else:
+ listName@# := v & ", " & listName@#;
+ fi;
+ fi;
+ fi;
+enddef;
+
+vardef sortList (expr listToSort, ascending) =
+ save nPre, nPost, pivot, isSorted, lastValue, preList, postList, rv;
+ numeric nPre, nPost, pivot;
+ boolean isSorted;
+ string preList, postList, rv;
+ nPre := 0;
+ nPost := 0;
+ isSorted := true;
+ if ascending:
+ lastValue := -infinity;
+ else:
+ lastValue := infinity;
+ fi;
+ for i=scantokens(listToSort):
+ if (unknown pivot):
+ pivot := i;
+ fi;
+ if ((i < pivot) and ascending) or ((i > pivot) and not ascending):
+ appendList (preList, i, -1, false);
+ nPre := nPre + 1;
+ else:
+ appendList (postList, i, -1, false);
+ nPost := nPost + 1;
+ fi;
+ if ((lastValue > i) and ascending) or ((lastValue < i) and not ascending):
+ isSorted := false;
+ fi;
+ lastValue := i;
+ endfor;
+ if isSorted:
+ rv := listToSort;
+ else:
+ if nPre > 1:
+ preList := sortList(preList, ascending);
+ fi;
+ if nPre > 0:
+ preList := preList & ", ";
+ else:
+ preList := "";
+ fi;
+ if nPost > 1:
+ postList := sortList(postList, ascending);
+ fi;
+ rv := preList & postList;
+ fi;
+ rv
+enddef;
+
+
+% When looking for intersections, knot is browsed with knotStepSize step.
+% Affects nothing interesting.
+numeric knotStepSize;
+knotStepSize := 1/8;
+
+vardef knotFromStrands (suffix knotName) =
+ save slidingSegment, timeToAdd, pathSegments, intTimes, tSegWidth, tSegStyle, numberOfSegments, segmentWidth, totalNumberOfSegments, intersections, intersectionsList, layerContents, layersList, b, e, n, layerContents, segmentPicture;
+ save shadowsEnabled, allShadowPaths, totalNumberOfShadows, numberOfShadows, shadowPath, tmpShadows;
+ boolean shadowsEnabled;
+ path shadowPath[], allShadowPaths[];
+ numeric timeToAdd, numberOfShadows, totalNumberOfShadows;
+ totalNumberOfShadows := -1;
+ tmpShadows := -1;
+ path inspectedPath, slidingSegment, pathSegments[];
+ pair intTimes[];
+ numeric intersections[], numberOfSegments[], segmentWidth[], totalNumberOfSegments, tSegWidth, b, e, n;
+ picture layerPicture[];
+ string layerContents[], segmentStyle[], tSegStyle;
+ totalNumberOfSegments := 0;
+ for sNa := 1 step 1 until knotName.nStrands:
+ inspectedPath := knotName.strandPath[sNa];
+ tSegWidth := knotName.strandWidth[sNa];
+ tSegStyle := knotName.strandStyle[sNa];
+ for sNb := 1 step 1 until knotName.nStrands:
+ for i := -knotStepSize step knotStepSize until length(knotName.strandPath[sNb]):
+ slidingSegment := subpath (i, i + 2knotStepSize) of knotName.strandPath[sNb];
+ intTimes0 := (inspectedPath firstIntersectionTimes slidingSegment);
+ intTimes1 := (reverse(inspectedPath) firstIntersectionTimes slidingSegment);
+ if (sNb = sNa):
+ if (xpart(intTimes0) >= i)
+ and (xpart(intTimes0) <= i + 2knotStepSize):
+ intTimes0 := (-1, -1);
+ fi;
+ if ((length(inspectedPath) - xpart(intTimes1)) >= i)
+ and ((length(inspectedPath) - xpart(intTimes1)) <= i + 2knotStepSize):
+ intTimes1 := (-1, -1);
+ fi;
+ if (i+knotStepSize >= length(inspectedPath)):
+ if (xpart(intTimes0) <= knotStepSize)
+ or (xpart(intTimes0) = length(inspectedPath)):
+ intTimes0 := (-1, -1);
+ fi;
+ if ((length(inspectedPath) - xpart(intTimes1)) <= knotStepSize)
+ or (xpart(intTimes1) = 0):
+ intTimes1 := (-1, -1);
+ fi;
+ fi;
+ if (i-knotStepSize <= length(inspectedPath)):
+ if (xpart(intTimes0) >= (length(inspectedPath) - knotStepSize))
+ or (xpart(intTimes0) = 0):
+ intTimes0 := (-1, -1);
+ fi;
+ if ((length(inspectedPath) - xpart(intTimes1)) >= (length(inspectedPath) - knotStepSize))
+ or (xpart(intTimes1) = length(inspectedPath)):
+ intTimes1 := (-1, -1);
+ fi;
+ fi;
+ fi;
+ timeToAdd := -1;
+ if ((ypart(intTimes0) > 0) and (ypart(intTimes0) < length(slidingSegment)))
+ and ((xpart(intTimes0) >= 0) and (xpart(intTimes0) <= length(inspectedPath)))
+ and ((sNb <> sNa) or ((xpart(intTimes0) < i) or (xpart(intTimes0) > i + 1))):
+ timeToAdd := xpart(intTimes0);
+ elseif (sNb = sNa):
+ if ((ypart(intTimes1) > 0) and (ypart(intTimes1) < length(slidingSegment)))
+ and ((xpart(intTimes1) >= 0) and (xpart(intTimes1) <= length(inspectedPath)))
+ and ((length(inspectedPath) - xpart(intTimes1) < i) or (length(inspectedPath) - xpart(intTimes1) > i + 1)):
+ timeToAdd := length(inspectedPath) - xpart(intTimes1);
+ fi;
+ fi;
+ if (timeToAdd >= 0):
+ if (timeToAdd = length(inspectedPath)):
+ timeToAdd := 0;
+ fi;
+ appendList[sNa](intersectionsList, round(timeToAdd*10)/10, 1, true);
+ fi;
+ endfor;
+ endfor;
+ if known intersectionsList[sNa]:
+ numberOfSegments[sNa] := 0;
+ for i := scantokens(sortList(intersectionsList[sNa], true)):
+ numberOfSegments[sNa] := numberOfSegments[sNa] + 1;
+ intersections[numberOfSegments[sNa]] := i;
+ endfor;
+ intersections[0] := 0;
+ if (not cycle knotName.strandPath[sNa]):
+ intersections[numberOfSegments[sNa] + 1] := length(knotName.strandPath[sNa]);
+ fi;
+ for i := 1 step 1 until numberOfSegments[sNa]:
+ totalNumberOfSegments := totalNumberOfSegments + 1;
+ if (i > 1):
+ b := 1/2[intersections[i-1], intersections[i]];
+ else:
+ if (not cycle knotName.strandPath[sNa]):
+ b := 0;
+ else:
+ b := 1/2[intersections[numberOfSegments[sNa]] - length(knotName.strandPath[sNa]), intersections[i]];
+ fi;
+ fi;
+ if (i < numberOfSegments[sNa]):
+ e := 1/2[intersections[i], intersections[i+1]];
+ else:
+ if (not cycle knotName.strandPath[sNa]):
+ e := length(inspectedPath);
+ else:
+ e := 1/2[intersections[i], intersections[1] + length(knotName.strandPath[sNa])];
+ fi;
+ fi;
+ pathSegments[totalNumberOfSegments] := subpath (b, e) of inspectedPath;
+ if (length(pathSegments[totalNumberOfSegments])<=2):
+ pathSegments[totalNumberOfSegments] := pathSubdivide(pathSegments[totalNumberOfSegments], 2);
+ fi;
+ segmentWidth[totalNumberOfSegments] := tSegWidth;
+ segmentStyle[totalNumberOfSegments] := tSegStyle;
+ endfor;
+ else:
+ totalNumberOfSegments := totalNumberOfSegments + 1;
+ numberOfSegments[sNa] := 1;
+ pathSegments[totalNumberOfSegments] := inspectedPath;
+ segmentWidth[totalNumberOfSegments] := tSegWidth;
+ segmentStyle[totalNumberOfSegments] := tSegStyle;
+ fi;
+ n := 0;
+ for i := scantokens(knotName.intLayers[sNa]):
+ n := n + 1;
+ if (n <= numberOfSegments[sNa]):
+ appendList[i](layerContents, totalNumberOfSegments - numberOfSegments[sNa] + n, 1, true);
+ appendList(layersList, i, 1, true);
+ fi;
+ endfor;
+ if n > 0:
+ if n < numberOfSegments[sNa]:
+ for i := n + 1 step 1 until numberOfSegments[sNa]:
+ appendList0(layerContents, totalNumberOfSegments - numberOfSegments[sNa] + i, 1, true);
+ endfor;
+ appendList(layersList, 0, 1, true);
+ fi;
+ else:
+ for i := 1 step 1 until numberOfSegments[sNa]:
+ appendList0(layerContents, totalNumberOfSegments - numberOfSegments[sNa] + i, 1, true);
+ endfor;
+ appendList(layersList, 0, 1, true);
+ fi;
+ endfor;
+ image(
+ for i := scantokens(sortList(layersList, false)):
+ layerPicture[i] := image(
+ for j := scantokens(layerContents[i]):
+ numberOfShadows := -1;
+ shadowsEnabled := false;
+ for k := 0 step 1 until totalNumberOfShadows:
+ if xpart((subpath (1/10, length(pathSegments[j]) - 1/10) of pathSegments[j])
+ intersectiontimes allShadowPaths[k]) > 0:
+ shadowsEnabled := true;
+ numberOfShadows := numberOfShadows + 1;
+ shadowPath[numberOfShadows] := allShadowPaths[k];
+ shadowDepth[numberOfShadows] := 3/2segmentWidth[j];
+ fi;
+ endfor;
+ save drawTubeEnds;
+ boolean drawTubeEnds;
+ drawTubeEnds := false;
+ draw tube.scantokens(segmentStyle[j])(pathSegments[j])(segmentWidth[j]) if segmentStyle[j] = "e": withpen thickpen fi;
+ tmpShadows := tmpShadows + 1;
+ allShadowPaths[tmpShadows] := tubeOutline;
+ endfor;
+ );
+ for j := 0 step 1 until totalNumberOfShadows:
+ layerPicture[i] := layerPicture[i] maskedWith allShadowPaths[j];
+ endfor;
+ totalNumberOfShadows := tmpShadows;
+ endfor;
+ for i := scantokens(sortList(layersList, true)):
+ draw layerPicture[i];
+ endfor;
+ )
+enddef;
+
+vardef addStrandToKnot (suffix knotName) (expr p, w, s, intersectionLayers) =
+ save n;
+ if not known knotName.nStrands:
+ numeric knotName.nStrands;
+ knotName.nStrands := 0;
+ fi;
+ if not path knotName.strandPath0:
+ path knotName.strandPath[];
+ fi;
+ if not numeric knotName.strandWidth0:
+ numeric knotName.strandWidth[];
+ fi;
+ if not string knotName.strandStyle0:
+ string knotName.strandStyle[];
+ fi;
+ if not string knotName.intLayers0:
+ string knotName.intLayers[];
+ fi;
+ knotName.nStrands := knotName.nStrands + 1;
+ n := knotName.nStrands;
+ knotName.strandPath[n] := p;
+ knotName.strandWidth[n] := w;
+ knotName.strandStyle[n] := s;
+ knotName.intLayers[n] := intersectionLayers;
+enddef;
Property changes on: trunk/Master/texmf-dist/metapost/fiziko/fiziko.mp
___________________________________________________________________
Added: svn:eol-style
## -0,0 +1 ##
+native
\ No newline at end of property
Modified: trunk/Master/tlpkg/bin/tlpkg-ctan-check
===================================================================
--- trunk/Master/tlpkg/bin/tlpkg-ctan-check 2019-03-08 22:21:13 UTC (rev 50292)
+++ trunk/Master/tlpkg/bin/tlpkg-ctan-check 2019-03-08 22:22:36 UTC (rev 50293)
@@ -280,7 +280,7 @@
findhyph fink finstrut fira firamath firamath-otf
first-latex-doc fitbox fithesis
fix2col fixcmex fixfoot fixjfm fixlatvian fixltxhyph fixme fixmetodonotes
- fixpdfmag
+ fixpdfmag fiziko
fjodor
flabels flacards flagderiv flashcards flashmovie flipbook flippdf
float floatflt floatrow
Modified: trunk/Master/tlpkg/tlpsrc/collection-metapost.tlpsrc
===================================================================
--- trunk/Master/tlpkg/tlpsrc/collection-metapost.tlpsrc 2019-03-08 22:21:13 UTC (rev 50292)
+++ trunk/Master/tlpkg/tlpsrc/collection-metapost.tlpsrc 2019-03-08 22:22:36 UTC (rev 50293)
@@ -17,6 +17,7 @@
depend featpost
depend feynmf
depend feynmp-auto
+depend fiziko
depend garrigues
depend gmp
depend hatching
Added: trunk/Master/tlpkg/tlpsrc/fiziko.tlpsrc
===================================================================
More information about the tex-live-commits
mailing list