[Scilab-users] density in a graph

[Jean-Philippe Grivet]

Dear all,

I am drawing a graph in a gray scale (say from 1 to 32), using lines of 
different density. I would like that, in the region of intersection of 
two lines, the shade of gray be the sum of the densities of each line. 
How can I manage that ?

Thanks in advance for any hint

JP Grivet