2 * Copyright © 2011 Intel Corporation
4 * Permission is hereby granted, free of charge, to any person
5 * obtaining a copy of this software and associated documentation
6 * files (the "Software"), to deal in the Software without
7 * restriction, including without limitation the rights to use, copy,
8 * modify, merge, publish, distribute, sublicense, and/or sell copies
9 * of the Software, and to permit persons to whom the Software is
10 * furnished to do so, subject to the following conditions:
12 * The above copyright notice and this permission notice shall be
13 * included in all copies or substantial portions of the Software.
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
16 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
18 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
19 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
20 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
21 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
24 * Author: Chris Wilson <chris@chris-wilson.co.uk>
27 /* A general convex shape with a twist. */
29 #include "cairo-test.h"
35 limacon (cairo_t *cr, double a, double b, double radius)
40 cairo_translate (cr, PAD, 0);
41 for (i = 0; i < 360; i++) {
42 double theta = i * M_PI / 180;
43 double r = b + a * cos (theta);
44 double x = radius * r * cos (theta);
45 double y = radius * r * sin (theta);
46 cairo_line_to (cr, x, y);
48 cairo_close_path (cr);
52 static cairo_test_status_t
53 draw (cairo_t *cr, int width, int height)
55 cairo_set_source_rgb (cr, 1, 1, 1);
59 cairo_translate (cr, 2*PAD, PAD);
61 cairo_translate (cr, SIZE/2, SIZE/2);
62 limacon (cr, 1, .5, SIZE/3); /* trivia, this is a trisectrix */
64 cairo_set_source_rgb (cr, 1, 0, 0);
65 cairo_fill_preserve (cr);
67 cairo_set_source_rgb (cr, 0, 0, 0);
70 cairo_scale (cr, -1, 1);
72 limacon (cr, 1, .5, SIZE/3); /* trivia, this is a trisectrix */
74 cairo_set_source_rgb (cr, 0, 0, 1);
75 cairo_fill_preserve (cr);
77 cairo_set_source_rgb (cr, 0, 0, 0);
80 return CAIRO_TEST_SUCCESS;
83 CAIRO_TEST (shape_general_convex,
84 "A general shape that is not as convex as it first appears",
85 "fill,stroke", /* keywords */
86 NULL, /* requirements */
87 SIZE+4*PAD, SIZE+4*PAD,