[texhax] Fwd: Re: Combining symbols [picture, axis_height]

Uwe Lück uwe.lueck at web.de
Wed Feb 11 09:39:32 CET 2009

Instead of previous/below on makebox(0,0), I could have done without 
axis_height and my \piczzbox by just saying that \makebox(0,0){...} should 
contain \mathstrut, at least when heights or depths of labels vary, or 
sometimes perhaps \vphantom{\big(}, or ... . My summing-up example then reads:

       \put(2,2){\makebox(0,0){b\quad}\_\makebox(0,0){\quad p}} %% bad
p\mathstrut}} %% fine

>Date: Mon, 09 Feb 2009 13:33:22 +0100
>To: johnp at bcs.org.uk, TeXhax discussion list <texhax at tug.org>, Donald 
>Arseneau <asnd at triumf.ca>
>From: Uwe Lück <uwe.lueck at web.de>
>Subject: Re: [texhax] Combining symbols [picture, axis_height]
>At 20:32 29.12.08, John Palmer wrote:
>>On Monday 29 December 2008 03:54:11 Daniel Freedman wrote:
>> > position a bullet over the arrowhead
>>I have done this sort of thing by using \raisebox for vertical and \kern for
>>horizontal movement, but there must be a more robust and elegant way, so 
>>be interested in other replies !
>At 15:58 04.01.09, John Palmer wrote:
>>I was in a picture environment, drawing a map, and wanted to put symbols 
>>centred on specified coordinates, so usually needed a shift leftwards and 
>>downwards from the default position.
>This led me to think about vertical placement of labels near marks of 
>certain points in the plain, and I wondered how \makebox(0,0) has been 
>used to obtain this. A main application may be labelling the "tic" marks 
>of the vertical axis of a diagram.
>I am curious about general conventions here, while I haven't tried to draw 
>x-y-diagrams so far. (You can adapt your field of research to your 
>graphical abilities, cf. 
>http://www.webdesign-bu.de/uwe_lueck/writings.html). The PS-Tricks people 
>may have clear convictions about this.
>\makebox(0,0){foo} (LaTeX picture environment) centers `foo' essentially 
>by \vbox{\vss\hbox{foo}\vss}. With \put(<x>,<y>){\makebox(0,0){foo}}, <y> 
>is half between top and bottom of `f' (their y-coordinates).
>So consider alignment of `b' and `p' in 
>\put(<x>,<y>){\makebox(0,0){b\quad}\_\makebox(0,0){\quad p}}. Tops of `b' 
>and `p' are aligned, likewise their bottoms, half in between the 
>horizontal stroke. This horizontal stroke may be a tic mark on the 
>vertical axis of an x-y-diagram.
>I think this is ridiculous, `b' and `p' should share a common baseline. I 
>think that the label for a mark at vertical position <y> should have its 
>*axis* at <y>, not half between its top and bottom. *axis* is here the 
>vertical position of *fraction strokes* (those horizontal lines between 
>numerators and denominators). I feel that this is the natural vertical 
>"center" of a line.
>To keep some touch with reality, I would like to consider the case that 
>the vertical axis of a diagram refers to an amount of *water*, in terms of 
>g (grams) as well as in terms of ml (1/1000 litres). Due to different \dp 
>and \hp (while there sums are the same), the names nad numbers of the 
>units would have different base lines.
>Therefore I thought that vertical centering of `foo' around (<x>,<y>) 
>should be just \put(<x>,<y>){$\lower\axisheight\hbox{foo}$}, with 
>\def\axisheight{\fontdimen22\textfont2\relax}. I would replace \makebox(0,0) by
>     \newcommand*{\piczzbox}[1]{%
>         $\m at th\raisebox{-\fontdimen22\textfont2}[\z@][\z@]%
>                        {\hb at xt@\z@{\hss#1\hss}}$}
>Complete example:
>     \setlength{\unitlength}{1in}
>     \begin{picture}(5,4)
>       \put(2,2){\makebox(0,0){b\quad}\_\makebox(0,0){\quad p}}
>       \put(4,2){\piczzbox{b\quad}\_\piczzbox{\quad p}}
>     \end{picture}
>Opinions? Or is this well-known? Of course the question may rise rarely, 
>axis tics usually are numbered, labels usually have same \dp and \ht.
>     Uwe.

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