On 11/01/16 10:56 PM, someone...@sigaint.org wrote:
> Hi, I have been trying to use Cairo to draw on a Gtk::Window. I was
> successful when I overrided on_draw(). But the only thing I saw was what I
> drew everything else was black. What I did was
>
> bool Window::on_draw(const Cairo::RefPtr<Cairo::Context>& cr)
> {
> Gdk::Cairo::set_source_pixbuf(cr, m_image, 10, 10);
> cr->paint();
>
> return false;
> }
I would use a Gtk::DrawingArea to draw in instead.
But since you saw what you draw, it is working. Maybe if you call the
superclass on_draw() first?
> On my second attempt I tried this:
>
> Window::Window()
> {
> auto cr = this->get_window()->create_cairo_context();
> cr->save();
> Gdk::Cairo::set_source_pixbuf(cr, m_image, 10, 10);
> cr->paint();
> cr->restore();
> }
>
> But this made the program crash. How can I draw on the Gtk::Window? Thank
> You.
I wouldn't expect in the constructor that the window be in the right
state to do that. You don't give the stack trace, but either
get_window() returns null of create_cairo_context() does. (and by NULL I
mean the raw pointer)
Hub
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