TheLonelyStar wrote:
> Hello dear community,
>
> I draw a pixmap on a Gtk::DrawingArea using render_to_drawable.
>
> What I have not found out is how to scale the pixmap while drawing!
> Any hints?
> Thanks!
>
> nathan
Cairo's perfect for that...
#include <gdk/gdkcairo.h>
...
// create a Cairo context that outputs to drawingarea's window
cairo_t* cairo = gdk_cairo_create(
drawingarea.get_window()->gobj());
// note above needs GdkWindow* from RefPtr<Gdk::Window>, hence gobj()
gdk_cairo_set_source_pixmap(cairo,
pixmap->gobj(), // function needs GdkPixmap*
0, 0);
cairo_scale(cairo, 2.0, 2.0);
cairo_rectangle(cairo, 0, 0, pixmap->get_width(), pixmap->get_height());
cairo_fill(cairo);
cairo_destroy(cairo);
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