On 1/20/06, Aditya Mahajan wrote:
> <--- On Jan 19, David Arnold wrote --->
> > I need an easy way of shading these areas:
> >
> > 1. A intersect B
> > 2. A union B
> > 3. A intersect (complement of B)
> > 4. (complement of A) intersect B
>
> There is venn.mp on ctan. Using it you can do basic shading of
> intersection, union etc for 0,1,2 or 3 sets very quickly. Read the
> documentation in source for details. For example
Thanks a lot for the very nice example;
> \startMPinclusions
> input venn;
> pair A,B,T[];
> A = (.4venn_width-.5venn_circle_diameter,.5venn_height);
> B = (.6venn_width+.5venn_circle_diameter,.5venn_height);
> T1 = (.5venn_width , 0);
> T2 = (.5venn_width,.5venn_height-.5venn_circle_diameter);
> vardef venn_shade = red;
vardef venn_shade = red enddef;
I tried the (transparent(.8,3,blue)) at that place, but it seems that
either ConTeXt or Acrobat have problems here. It either compiled, but
then Adobe Reader complained, if I tried to compile
fill fullcircle scaled 3cm withcolor (transparent(.8,3,blue));
manually, then I got an error
**\relax venn-mpgraph.3
(venn-mpgraph.3
! Undefined control sequence.
\handleMPspecialscommentx #1 ->\doifelse
{#1}{10000}{\settrue \manyMPspecial...
l.15 %%MetaPostSpecials: 2.0 123 1000
?
Missing character: There is no 1 in font nullfont!
...
> Perhaps one can combine the transparent color functionality of
> metapost with venn.mp to get really nice colors for intersections etc.
Hans: please fix the typo on line 488 in mp-spec.mp. I copied the
example from there and wondered why it didn't work (well, it still
doesn't work - the problem described above).
Mojca
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