On Tue, 2007-11-27 at 22:17 -0500, Stewart Weiss wrote: > Richard: > > Thanks for this suggestion. Last night after sending the message, I > did, in fact, resort to > doing pretty much what you suggested below, by getting the mouse-down, > then tracking it > with button-motion-notify, and then getting the mouse-up event. But I > am not using a temporary > pixmap, and I have to erase each previously drawn line. > > What I want to achieve is a typical Line Tool, like the one in Windows > Paint, one that will > continuously redraw the line as I drag the mouse. In order to solve > this, in my motion-notify-event > handler I erase the previous line by drawing it on the window (not the > pixmap) using the background > color of my pixmap, then draw a new one in the window (not in the > pixmap). When I get the mouse up event, > I draw the last line into the pixmap and render it to the screen. But > I still have some problems. > When I erase the previous line, I also erase pixels that might have > been drawn as part of something > else in the window, so my solution is that when I get the button-up > event I invalidate the entire > window to redraw it. But until I release the mouse button, the erase > pixels remain erased. I was thinking > of invalidating the rectangle containing the line each time to se if > that would work, but I have not tried it > yet (busy day). But any other ideas would be appreciated. google for "draw xor gtk" and read on ... _______________________________________________ gtk-list mailing list gtk-list@xxxxxxxxx http://mail.gnome.org/mailman/listinfo/gtk-list
