29 Oct 2007

Asymptote and opacity – fig0120

Figure 0012
(Compiled with Asymptote version 1.87svn-r4652)
import edvenn_pi;

// Difference: Subtracts the darker of the two constituent colors from the lighter
// color:
// Painting with white inverts the backdrop color; painting with black
// produces no change.
string blend="Difference";


path [] edvenn= EdVenn(4);
pen [] fillp= new pen[]{black, red, green, blue};
pen p=linewidth(1mm);

for (int i=0; i<4; ++i) {
  filldraw(edvenn[i], fillpen=fillp[i], drawpen=linewidth((i+1)*mm/2));


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