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110 lines
2.8 KiB
C
110 lines
2.8 KiB
C
/*
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* Copyright © 2003 USC, Information Sciences Institute
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*
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* Permission to use, copy, modify, distribute, and sell this software
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* and its documentation for any purpose is hereby granted without
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* fee, provided that the above copyright notice appear in all copies
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* and that both that copyright notice and this permission notice
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* appear in supporting documentation, and that the name of the
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* University of Southern California not be used in advertising or
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* publicity pertaining to distribution of the software without
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* specific, written prior permission. The University of Southern
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* California makes no representations about the suitability of this
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* software for any purpose. It is provided "as is" without express
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* or implied warranty.
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*
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* THE UNIVERSITY OF SOUTHERN CALIFORNIA DISCLAIMS ALL WARRANTIES WITH
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* REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL THE UNIVERSITY OF
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* SOUTHERN CALIFORNIA BE LIABLE FOR ANY SPECIAL, INDIRECT OR
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
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* OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
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* NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* Author: Carl D. Worth <cworth@isi.edu>
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*/
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#include <cairo.h>
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#include <math.h>
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#ifndef M_PI
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#define M_PI 3.1415926
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#endif/*M_PI*/
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void
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draw_stars (cairo_t *cr, int width, int height);
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void
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star_path (cairo_t *cr);
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#define WIDTH 600
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#define HEIGHT 275
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#define STRIDE (WIDTH * 4)
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unsigned char image[STRIDE*HEIGHT];
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int
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main (void)
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{
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cairo_surface_t *surface;
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cairo_t *cr;
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surface = cairo_image_surface_create_for_data (image, CAIRO_FORMAT_ARGB32,
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WIDTH, HEIGHT, STRIDE);
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cr = cairo_create (surface);
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cairo_rectangle (cr, 0, 0, WIDTH, HEIGHT);
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cairo_set_source_rgb (cr, 1, 1, 1);
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cairo_fill (cr);
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draw_stars (cr, WIDTH, HEIGHT);
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cairo_destroy (cr);
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cairo_surface_destroy (surface);
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return 0;
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}
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void
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star_path (cairo_t *cr)
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{
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int i;
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double theta = 4 * M_PI / 5.0;
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cairo_move_to (cr, 0, 0);
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for (i=0; i < 4; i++) {
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cairo_rel_line_to (cr, 1.0, 0);
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cairo_rotate (cr, theta);
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}
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cairo_close_path (cr);
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}
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void
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draw_stars (cairo_t *cr, int width, int height)
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{
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cairo_set_source_rgb (cr, 0, 0, 0);
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cairo_save (cr);
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{
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cairo_translate (cr, 5, height / 2.6);
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cairo_scale (cr, height, height);
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star_path (cr);
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cairo_set_fill_rule (cr, CAIRO_FILL_RULE_WINDING);
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cairo_fill (cr);
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}
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cairo_restore (cr);
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cairo_save (cr);
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{
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cairo_translate (cr, width - height - 5, height / 2.6);
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cairo_scale (cr, height, height);
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star_path (cr);
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cairo_set_fill_rule (cr, CAIRO_FILL_RULE_EVEN_ODD);
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cairo_fill (cr);
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}
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cairo_restore (cr);
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}
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