>> is this an AA canvas? how are you drawing the grid? > > >Yes, AA canvas. > >I have a variable that controls how wide (in pixels) each grid square >should be. I start at the world's mininum x and increment to the >world's maximum x, drawing a line from the world's mininum y to the >maximum y (for vertical lines). And repeat for horizontal lines. i can't give you very specific advice, but i do know that in my use of the canvas (i still use the back-ported GtkCanvas) i ended up writing a canvas_simpleline item which renders only horizontal and vertical lines, rather than the multipoint/antialiased lines that libart_gpl is capable of. it helped speed up related issues. i don't know if it would help you. the source is in CVS at http://ardour.org/download.html (see the viewcvs link; in ardour/gtk_ardour/canvas-simpleline.c) i did the same for canvas-simplerect, which is very much faster than the rect item that comes with the canvas. my canvas is UINT32_MAX x UINT32_MAX although it is rarely filled much. --p _______________________________________________ gtk-list@xxxxxxxxx http://mail.gnome.org/mailman/listinfo/gtk-list
