On Jul 13, 4:47 pm, Jason Grout <jason-s...@creativetrax.com> wrote:
> On 7/13/10 4:46 AM, David Sanders wrote:
>
>
>
> > Hi,
>
> > I need to superimpose several region_plot's. These have regions
> > colored in different colors which may or may not overlap. However, if
> > I do something like
>
> > var('p q')
> > plot1 = region_plot([p+q<1, p+q>-1], (p,-2,2), (q,-2,2), incol='red')
> > plot2 = region_plot([p-q<1, p-q>-1], (p,-2,2), (q,-2,2), incol='blue')
> > show(plot1+plot2)
>
> > then I see at most the outline of the first plot. It seems that the
> > second plot covers up the first plot, since the default value of
> > outcol is 'white'.
>
> > Is there any way to make these plots transparent (i.e. with an alpha
> > value less than 1), or at least not opaque? I tried putting the
> > option
>
> > outcol=None
>
> > but this is not accepted. This would seem to me to be the first way of
> > solving the issue.
>
> > I had a look at the code for region_plot, which I at least understand
> > the idea of. It uses matplotlib for the graphics, so perhaps the
> > question of transparency is a matplotlib question. Nonetheless, I
> > believe that matplotlib does have this capability, so this should be
> > possible...!
>
> It seems that adding transparency is a natural way to do this. I've
> posted a rough patch to do this up
> athttp://trac.sagemath.org/sage_trac/ticket/9491
>
> I've also attached a figure resulting from:
>
> var('p q')
> plot1 = region_plot([p+q<1, p+q>-1], (p,-2,2), (q,-2,2), incol='red',
> opacity=0.5)
> plot2 = region_plot([p-q<1, p-q>-1], (p,-2,2), (q,-2,2), incol='blue',
> opacity=0.5)
> show(plot1+plot2)
Exactly what I had in mind, thanks!
David.
>
> Sorry I don't have right now to finish the patch and ask for review; I'm
> rushing out the door.
>
> Thanks,
>
> Jason
>
> regionplot.png
> 27KViewDownload
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