Thanks Tadej. That's a very good reference.
(Also, thanks for creating a tutorial on using glade some years back, which i found useful.) dan On Mon, May 15, 2017 at 12:25 AM, Tadej Borovšak <tadeb...@gmail.com> wrote: > On Sat, May 13, 2017 at 05:00:43PM -0700, Dan Hitt wrote: >> So it appears that when you draw in a drawing area, using commands >> like (cairo_)move_to and (cairo_)line_to, the path is rendered >> relative to the top left of the area. >> >> More explicitly, if you try to figure out how far you can draw, the x >> and y values from get_allocation(...) are not relevant, only the width >> and height. >> >> Or in other words, the location at the top left of the drawing area >> has coordinates (0, 0) and at the bottom right has coordinates (width, >> height), rather than (x, y) and (x+width, y+height), at least as far >> as primitives like move_to and line_to are concerned. >> >> This sure seems to be true on my system (debian stretch) using gtk3, >> but if i'm wrong, please correct me. > > Yes, you are correct, things do work this way. > >> Also, is this documented anywhere, or am i the only person clueless >> enough to try to get to the top left by going to the x,y returned by >> get_allocation, instead of to (0,0)? > > This is documented in the draw signal docs [1]. > > Cheers, > Tadej > > > [1] https://developer.gnome.org/gtk3/stable/GtkWidget.html#GtkWidget-draw > > -- > Tadej Borovšak > tadeb...@gmail.com > tadej.borov...@gmail.com _______________________________________________ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org https://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
