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Re: st: Parse graphsize from schemes into program


From   Ulrich Kohler <kohler@wz-berlin.de>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Parse graphsize from schemes into program
Date   Mon, 21 Jun 2004 18:59:26 +0200

Thank you Vince, that does the trick.

uli


Vince Wiggins, StataCorp wrote:
> Uli Kohler <kohler@wz-berlin.de> asks about reading the default graph size
> from the current graphics scheme,
>
> > in a program I want to set the default xsize() of a graph equal to
> > the -graphsize y- of the scheme.
> >
> > Is there a way to read the default graph size from the scheme which
> > is actually loaded?
>
> The concept of a current scheme is rather plastic in the graphics
> environment. For example, it is possible to -graph combine- two graphs
> drawn with different schemes and for those graphs to maintain their
> original schemes.
>
> It is safest for Uli to first draw a graph using the desired scheme, then
> pull the size from the graph's own scheme object.  For example, after
>
>       . scatter mpg weight , nodraw
>
> Uli, could type
>
>       . di `.Graph._scheme.graphsize.y'
>
> to see the default graph y size for the scheme, or
>
>       . local ysize `.Graph._scheme.graphsize.y'
>
> to put that size in a local macro.
>
> We are doing nothing more more than pulling the value of an sub-object from
> within the object that holds our graph.  Because we did not name our graph,
> it is named "Graph" and that is where we got the first part of the name
>
>       .Graph._scheme.graphsize.y
>        ^^^^^
>
> All graph hold a reference to the scheme they were drawn with in the
> sub-object _scheme
>
>       .Graph._scheme.graphsize.y
>              ^^^^^^^
>
> Schemes all define a graphsize sub-object
>
>       .Graph._scheme.graphsize.y
>                      ^^^^^^^^^
>
> And it contains the x and y size of the graph
>
>       .Graph._scheme.graphsize.y
>                                ^
>
> In Stata, this nested name can be treated just like a local macro name and
> dereferenced using macro quotes, and that is how we fetched the value
>
>       `.Graph._scheme.graphsize.y'
>       ^                          ^
>
>
> -- Vince
>    vwiggins@stata.com
>
> *
> *   For searches and help try:
> *   http://www.stata.com/support/faqs/res/findit.html
> *   http://www.stata.com/support/statalist/faq
> *   http://www.ats.ucla.edu/stat/stata/

-- 
kohler@wz-berlin.de
+49 (030) 25491-361


*
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*   http://www.stata.com/support/faqs/res/findit.html
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*   http://www.ats.ucla.edu/stat/stata/



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