cairo example

#include <X11/Xlib.h>
#include <cairo/cairo.h>
#include <cairo/cairo-xlib.h>

int main ()
{
    Display *dpy;
    Window rootwin;
    Window win;
    XEvent e;
    int scr;
    cairo_surface_t *cs;
    cairo_t *cr;

    dpy = XOpenDisplay (NULL);
    if (dpy == NULL) return -1;

    scr = DefaultScreen (dpy);
    rootwin = RootWindow (dpy, scr);

    win = XCreateSimpleWindow (dpy, rootwin, 1, 1, 800, 600, 0, \
                               BlackPixel (dpy, scr), BlackPixel (dpy, scr));

    XStoreName (dpy, win, "hello");
    XSelectInput (dpy, win, ExposureMask|ButtonPressMask);
    XMapWindow (dpy, win);

    cs = cairo_xlib_surface_create (dpy, win, DefaultVisual (dpy, 0), 800, 600);
    cr = cairo_create (cs);

    cairo_set_line_width (cr, 3);
    cairo_set_source_rgb (cr, 1, 0, 1);
    cairo_rectangle (cr, 0, 0, 300, 100);
    cairo_fill (cr);
    cairo_set_source_rgb (cr, 0, 0, 1);
    //cairo_stroke (cr);
    cairo_move_to (cr, 0, 0);
    cairo_line_to (cr, 800, 600);
    cairo_stroke (cr);

    cairo_arc (cr, 400, 300, 30, 0, 2*3.1415);
    cairo_close_path (cr);
    cairo_fill (cr);

    while (1)
    {
        XNextEvent (dpy, &e);
        if (e.type == Expose && e.xexpose.count < 1) ;
        else if (e.type == ButtonPress) break;
    }

    cairo_surface_destroy (cs);
    XCloseDisplay (dpy);

    return 0;
}