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Re: st: Transparent graph


From   "Joseph Coveney" <jcoveney@bigplanet.com>
To   "Statalist" <statalist@hsphsun2.harvard.edu>
Subject   Re: st: Transparent graph
Date   Wed, 1 Oct 2008 01:06:06 +0900

Sergiy Radyakin wrote:

I am writing a graphing procedure (directly with Stata's undocumented
gdi commands). There is a pseudo-transparency effect as can be seen
below:

sysuse auto, clear
generate ww = weight * 2.85
twoway area price ww l, sort fi(100 100)
twoway area price ww l, sort fi(30 30)

Is it possible to achieve "true-transparency" (where the first "blue"
graph could be seen through the second "pink")?

In technical terms: does gdi shadelevel set color or the method of
drawing (SET,OR,AND,XOR)? I.e. is it equivalent to
gdi shadergb = `i' * `R'    `i' * `G'    `i' * `B'
??

--------------------------------------------------------------------------------

Adrian Mander has written something that might help you get closer to what
you're looking for.  He mentions it in this post:

http://www.stata.com/statalist/archive/2006-10/msg00018.html

Joseph Coveney


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