[texhax] TikZ and plain TeX

[Suresh Govindachar]

% I have started reading the TikZ 3.0.0 manual and am
% unable to run one of the examples in it.  I writing in
% plain TeX using MikTeX Windows 7, 64 bit;  compiling
% with the command "pdftex foo.tex"

   %% Plain TeX file
   \input tikz.tex
   \baselineskip=12pt
   \hsize=6.3truein
   \vsize=8.7truein

   Following (stealth arrows) works:

   \tikzpicture{>=Stealth}
   \draw [->] (0,0) arc [start angle=180, end angle=30, radius=10pt];
   \draw [<<-,very thick] (1,0) -- (1.5cm,10pt) -- (2cm,0pt) -- 
(2.5cm,10pt);
   \endtikzpicture.

   Following errors out
   % with message ! Package pgfkeys Error: I do not know the key 
'/tikz/name path'

   \tikzpicture  %{intersections}
   \clip (-0.1,-0.2) rectangle (1.1,1.51);
   \draw[step=.5cm,gray,very thin] (-1.4,-1.4) grid (1.4,1.4);
   \draw[->] (-1.5,0) -- (1.5,0);
   \draw[->] (0,-1.5) -- (0,1.5);
   \draw (0,0) circle [radius=1cm];
   \filldraw[fill=green!20,draw=green!50!black] (0,0) -- (3mm,0mm)
   arc [start angle=0, end angle=30, radius=3mm] -- cycle;
   \draw[red,very thick] (30:1cm) -- +(0,-0.5);
   \draw[blue,very thick] (30:1cm) ++(0,-0.5) -- (0,0);
   \path [name path=upward line] (1,0) -- (1,1);
   \path [name path=sloped line] (0,0) -- (30:1.5cm);
   \draw [name intersections={of=upward line and sloped line, by=x}]
   [very thick,orange] (1,0) -- (x);
   \endtikzpicture.

   % Also, have not had success with examples from the manual that
   % involve "pic"

   \bye