thank you for the answer :) > Don't draw pixel by pixel, it would be awfully slow. > Use GdkPixbufs and gdk_draw_pixbuf(). you mean "don't draw pixel by pixel using drawpoint", is that it? > Something along these lines should be doable *if* you can > get a indexed color visual, which you cannot count on. So > I would just redraw it (incidentally I develop a program > which uses false-color maps a lot and redrawing works good > enough). that's a pity but i'll have to cope with that if there's no other way. however, i ran into a problem with colourmaps. i was using gdk.image (has the putpixel method which treats the colours in a more traditional way, and seems to be fast enough for my needs) but didn't manage to change the colours it uses. i keep getting a blue gradient which is not precisely what i want. here's the code: def img=Image(ImageType.Fastest,Visual.System,500,500); for (mutable x=0, x<500; x++) for (mutable y=0; y<500; y++) img.PutPixel(x,y,(x+y):>UInt32); def gc=GC(args.Event.Window); mutable col=Color(0xff,0,0); gc.Colormap.AllocColor(ref col,true,true); img.Colormap=gc.Colormap; args.Event.Window.DrawImage(gc,img,0,0,0,0,500,500); i don't seem to be able to spot anything red in the result. could you please tell me what i am doing wrong? _______________________________________________ gtk-list@xxxxxxxxx http://mail.gnome.org/mailman/listinfo/gtk-list
