[cairo] dimensionally accurate drawings on screen ?
Jason Dorje Short
jdorje at users.sf.net
Fri Jan 20 12:30:54 PST 2006
John Ellson wrote:
> This isn't a cairo problem, I'm sure, but I'm hoping that someone here will
> know how to solve it.
> I'm trying to create dimensionally accurate drawings using cairo on a
> GdkDrawable using
> GdkDrawable *drawable;
> cairo_t *cr;
> drawable = gtk_drawing_area_new();
> cr = gdk_cairo_create (drawable);
> I can generate the drawings ok. Its the dimensionally accurate part I'm
> having difficultly with.
> I'd like to scale according to accurate xy resolution values. With Xlib
> I know I can obtain the
> resolution with:
> resolution.x = DisplayWidth(dpy, scr) / DisplayWidthMM(dpy, scr);
> resolution.y = DisplayHeight(dpy, scr) / DisplayHeightMM(dpy, scr);
> but how can I get from "GdkDrawable *display" to the "Display* dpy" and
> the "int scr" ?
> Thanks in advance for any hints.
gdk isn't just a wrapper for xlib. You need to use an appropriate gdk
function instead. Try looking at the GdkScreen API.
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