Dear All,
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'
??
Thank you,
Sergiy Radyakin
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