Argh! Turns out the problems with example 30 and the gd driver were  actually that transparency doesn't play nicely with a non-zero fill  width. Setting the fill_width parameter to zero in example 30 fixes the  problem with the image becoming opaque far too quickly.
Argh! Turns out the problems with example 30 and the gd driver were 
actually that transparency doesn't play nicely with a non-zero fill 
width. Setting the fill_width parameter to zero in example 30 fixes the 
problem with the image becoming opaque far too quickly.

Both pngcairo and png drivers still suffer from the problem with 
horizontal lines at the boundary of the shading regions. To fix this 
probably requires that the plotted polygons do not overlap. In general 
this may be hard to achieve.


svn path=/trunk/; revision=8157

FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot