On 14 July 2014 00:22, Chris Vine <ch...@cvine.freeserve.co.uk> wrote: >> If that is not possible only then I'd be forced to do everything in a >> single on_draw(). > > You should draw in the on_draw() method or in a draw signal handler so > that the widget re-renders correctly when this is necessary by virtue of > other desktop activities. Obviously your overriding on_draw() method > can call whatever other drawing functions it wants. You can force a > draw when needed by calling Gtk::Widget::queue_draw_area() and cognates.
Pardon me, but I didn't get you. Can you explain with some example? Are you saying that everything that is to be drawn must be written in on_draw function? Suppose I have two functions that are called to draw point and line, something like this: http://pastebin.com/Ancx87EF But if this is it, it'd re-draws the whole drawing area, so I'd be unable to retain any previously drawn entity. And that is why I was asking if it could be done something like, void DrawingArea :: on_line_cb() { cr->set_source_rgb(0.0, 0.26, 0.26); cr->save(); cr->move_to(0,0); cr->line_to(100,100); cr->restore(); cr->stroke(); queue_draw(); std::cout<<"Line created"<<std::endl; } But this doesn't work because it says that 'cr' is not declared in the scope or something related to this. P.S: I am unable to get any help from the documentation or even on stackoverflow. :( -- Gurjot Singh Blog: http://bhattigurjot.wordpress.com "It takes a person who is wide awake to make his dream come true." ~ Roger Babson _______________________________________________ gtkmm-list mailing list gtkmm-list@gnome.org https://mail.gnome.org/mailman/listinfo/gtkmm-list
