On Mon, 2009-03-02 at 12:44 +0000, Kai-Martin Knaak wrote: > > 1) is this actually a useful enough feature for people to warrant > > putting any time into it? One thing we would probably be able to do > > better than now is support layer transparency. > > Ack. Transparency when printing is a missing feature.
Sensibly, you want cairo to do this. postscript doesn't support transparency / compositing like PDF does, so you need fall-backs to images, or computational geometry to draw each combination of overlapped layers in the appropriate final colour. I'm not sure how quickly you'd hit image fall-backs with cairo doing compositing to a PS backend, but the code required to do otherwise sounds like it would be a nightmare to write. As much as I like .ps output in programs, I think we need to skip straight to .pdf if we want to support translucency in a meaningful way whilst retaining vector output. IE.. a PDF output HID using shared cairo code to render. -- Peter Clifton Electrical Engineering Division, Engineering Department, University of Cambridge, 9, JJ Thomson Avenue, Cambridge CB3 0FA Tel: +44 (0)7729 980173 - (No signal in the lab!) _______________________________________________ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user