[Scilab-users] ?==?utf-8?q? ?==?utf-8?q? ?= density in a grap

[Antoine Monmayrant]

That's what I understood, but using lines, not polygons.

Another approach than what I suggested previously would be to pixelate everything: ie make a big matrix for the whole graph and increment the value stored at a certain coordinate whenever it falls under one of the lines.
You could then plot this matrix using matplot of sgrayplot... with a graycolormap (maybe reversed graycolormap).
Far from ideal, but it would work.

Antoine 
 
 
Le Jeudi, Janvier 23, 2020 21:27 CET, P M <p.muehlmann at gmail.com> a écrit: 
 
> something like this...only in gray?
> [image: test.png]
> 
> Am Do., 23. Jan. 2020 um 19:08 Uhr schrieb Antoine Monmayrant <
> amonmayr at laas.fr>:
> 
> > Hello Jean-Philippe,
> >
> > I think I understand what you want to do, but there is no easy way to get
> > this in scilab.
> > The main issue is that scilab does not support transparency.
> > Otherwise, you could just plot your lines in black with 1/32 alpha (or
> > 255/32 alpha if 0 means transparent and 255 solid color).
> > For this kind of plot, I usually plot everything in scilab with a dummy
> > color (let's say blue), export in svg, edit the svg to replace the dummy
> > color by the transparent one.
> >
> > Antoine
> >
> >
> > Le Jeudi, Janvier 23, 2020 16:35 CET, Jean-Philippe Grivet <
> > jean-philippe.grivet at wanadoo.fr> a écrit:
> >
> > > 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
> > >
> > >
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