At Sun, 29 Mar 2009 18:41:52 +0100, Noel Welsh wrote: > 1. The Cairo code will be mostly generic, so I think there should be a > dc base class/mixin/trait in common
Yes. > 2. The Cairo drawing model is quite different to the dc model. dc is > immediate -- you call functions and the shapes appear immediately. The > Cairo model is to specify the path completely and only then stroke > and/or fill the path. Presumably this enables GPU optimisations. This > naturally leads to functions like line_to etc. The Cairo model also > goes beyond dc, offering alpha channel, masking, etc. No doubt you > know all this. How do you envisage extending the dc to offer these > features? `dc<%>' already supports `dc-path%', which is close to the Cairo (i.e., PostScript) model. There's also already a global alpha, and we'll add more things like rotation (or, more generally, a transformation matrix). Is masking different from clipping? I guess I'll find out... BTW, I'm writing this message in a SirMail that's running on top of `editor<%>' classes that are implemented in Scheme instead of C++ (which is phase 1 of this re-implement MrEd experiment). If testing continues to go well, I may be able to merge to the trunk soon. _________________________________________________ For list-related administrative tasks: http://list.cs.brown.edu/mailman/listinfo/plt-dev
