evo/Gtk4-tutorial: GTK 4 tutorial for beginners

src/misc/cairo.c

36 строк946 B

Paul Schulz

Minor changes for readability to section 22

07 мар 2022, 08:16

07 мар 2022, 08:16bc9d54a

#include <cairo.h>

int
main (int argc, char **argv)
{
  cairo_surface_t *surface;
  cairo_t *cr;
  int width = 100;
  int height = 100;
  int square_size = 40.0;

  /* Create surface and cairo */
  surface = cairo_image_surface_create (CAIRO_FORMAT_RGB24, width, height);
  cr = cairo_create (surface);

  /* Drawing starts here. */
  /* Paint the background white */
  cairo_set_source_rgb (cr, 1.0, 1.0, 1.0);
  cairo_paint (cr);
  /* Draw a black rectangle */
  cairo_set_source_rgb (cr, 0.0, 0.0, 0.0);
  cairo_set_line_width (cr, 2.0);
  cairo_rectangle (cr,
                   width/2.0 - square_size/2,
                   height/2.0 - square_size/2,
                   square_size,
                   square_size);
  cairo_stroke (cr);

  /* Write the surface to a png file and clean up cairo and surface. */
  cairo_surface_write_to_png (surface, "rectangle.png");
  cairo_destroy (cr);
  cairo_surface_destroy (surface);

  return 0;
}