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Re: st: Parse graphsize from schemes into program
Thank you Vince, that does the trick.
Vince Wiggins, StataCorp wrote:
> Uli Kohler <email@example.com> 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
> All graph hold a reference to the scheme they were drawn with in the
> sub-object _scheme
> Schemes all define a graphsize sub-object
> And it contains the x and y size of the graph
> 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
> ^ ^
> -- Vince
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