On Wed, Mar 24, 2010 at 7:42 PM, Glynn Clements <[email protected]>wrote:
> > pete davidson wrote: > > > I'm producing maps in svg format using the cairo driver and d.out.file. > One > > thing I'd really like to be able to do is set one or more of the vector > > layers to be partially translucent. After rummaging through this list, > I'm > > beginning to wonder if its possible at all, since translucency in the > guis > > seems to be handled by g.pnmcomp, but perhaps someone with more > experience > > knows a way to do it. > > It isn't. The graphics API doesn't support an alpha component. > > Apart from anything else, it can't easily be implemented for > PostScript output, as PostScript doesn't support translucency. Faking > it with patterns is possible, but it starts getting complicated if you > want more than one translucent layer. > > > The only workaround I've managed to find so far is to export each layer > as > > an individual svg, then use something like inkscape to rejoin them, > setting > > the translucency/transparency of each layer as I do it. Which is fine > for a > > map with only a few layers, but gets tedious when dealing with maps with > > dozens of layers. > > SVG is XML, so it shouldn't be especially hard to automate the process > using generic XML-processing tools. > Ohh, I hadn't thought of editing the svg/xml directly. Thanks for the suggestion, I'll see what I can achieve from there. Regards, Peter
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