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/*
* Copyright © 2011 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy,
* modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* Author: Chris Wilson <chris@chris-wilson.co.uk>
*/
/* A general convex shape with a twist. */
#include "cairo-test.h"
#define SIZE (100)
#define PAD 4
static void
limacon (cairo_t *cr, double a, double b, double radius)
{
int i;
cairo_save (cr);
cairo_translate (cr, PAD, 0);
for (i = 0; i < 360; i++) {
double theta = i * M_PI / 180;
double r = b + a * cos (theta);
double x = radius * r * cos (theta);
double y = radius * r * sin (theta);
cairo_line_to (cr, x, y);
}
cairo_close_path (cr);
cairo_restore (cr);
}
static cairo_test_status_t
draw (cairo_t *cr, int width, int height)
{
cairo_set_source_rgb (cr, 1, 1, 1);
cairo_paint (cr);
cairo_save (cr);
cairo_translate (cr, 2*PAD, PAD);
cairo_translate (cr, SIZE/2, SIZE/2);
limacon (cr, 1, .5, SIZE/3); /* trivia, this is a trisectrix */
cairo_set_source_rgb (cr, 1, 0, 0);
cairo_fill_preserve (cr);
cairo_set_source_rgb (cr, 0, 0, 0);
cairo_stroke (cr);
cairo_scale (cr, -1, 1);
limacon (cr, 1, .5, SIZE/3); /* trivia, this is a trisectrix */
cairo_set_source_rgb (cr, 0, 0, 1);
cairo_fill_preserve (cr);
cairo_set_source_rgb (cr, 0, 0, 0);
cairo_stroke (cr);
return CAIRO_TEST_SUCCESS;
}
CAIRO_TEST (shape_general_convex,
"A general shape that is not as convex as it first appears",
"fill,stroke", /* keywords */
NULL, /* requirements */
SIZE+4*PAD, SIZE+4*PAD,
NULL, draw)
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