Hi all,
experimenting with transparencies, I have obviously come to a
limitation: color shading does not work for transparent colors. What I
have in mind is a bar filled with a color gradient, starting from a
certain (non-transparent) color and ending transparent, i.e. vanishing
into the background. However, the transparent color appears just black.
Furthermore, the shading variants for linear_shade do not correspond
with those listed in the metafun manual, page 180. Variant 2 is missing
and behaves like variant 3 should.
Example:
\setupcolors[state=start]
\setupbackgrounds[page][background=color,backgroundcolor=red]
\startMPenvironment[global]
\definecolor[HeadLineColor][r=0,g=0,b=1]
\definecolor[Transparent][r=1,g=1,b=1,t=0,a=normal]
\stopMPenvironment
\startreusableMPgraphic{test}
numeric u; u=3cm;
path p;
p := unitsquare xscaled u yscaled u cornered (u/10);
for i=0 upto 3 :
linear_shade(p
shifted(i*u,0),i,\MPcolor{HeadLineColor},\MPcolor{Transparent});
endfor;
\stopreusableMPgraphic
\starttext
\reuseMPgraphic{test}
\stoptext
--
Eckhart
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