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/*
* Copyright © 2009 Adrian Johnson
*
* 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: Adrian Johnson <ajohnson@redneon.com>
*/
#include "cairo-test.h"
#include <math.h>
#define PAT_WIDTH 100
#define PAT_HEIGHT 100
#define SIZE PAT_WIDTH
#define PAD 2
#define WIDTH (PAD + SIZE + PAD)
#define HEIGHT WIDTH
/*
* This test is designed to paint a mesh pattern which contains 8
* circular sectors approximating a conical gradient.
*/
#define CENTER_X 50
#define CENTER_Y 50
#define RADIUS 50
static void
sector_patch (cairo_pattern_t *pattern,
double angle_A,
double A_r, double A_g, double A_b,
double angle_B,
double B_r, double B_g, double B_b)
{
double r_sin_A, r_cos_A;
double r_sin_B, r_cos_B;
double h;
r_sin_A = RADIUS * sin (angle_A);
r_cos_A = RADIUS * cos (angle_A);
r_sin_B = RADIUS * sin (angle_B);
r_cos_B = RADIUS * cos (angle_B);
h = 4.0/3.0 * tan ((angle_B - angle_A) / 4.0);
cairo_mesh_pattern_begin_patch (pattern);
cairo_mesh_pattern_move_to (pattern, CENTER_X, CENTER_Y);
cairo_mesh_pattern_line_to (pattern,
CENTER_X + r_cos_A,
CENTER_Y + r_sin_A);
cairo_mesh_pattern_curve_to (pattern,
CENTER_X + r_cos_A - h * r_sin_A,
CENTER_Y + r_sin_A + h * r_cos_A,
CENTER_X + r_cos_B + h * r_sin_B,
CENTER_Y + r_sin_B - h * r_cos_B,
CENTER_X + r_cos_B,
CENTER_Y + r_sin_B);
cairo_mesh_pattern_set_corner_color_rgb (pattern, 0, 1, 1, 1);
cairo_mesh_pattern_set_corner_color_rgb (pattern, 1, A_r, A_g, A_b);
cairo_mesh_pattern_set_corner_color_rgb (pattern, 2, B_r, B_g, B_b);
cairo_mesh_pattern_end_patch (pattern);
}
static cairo_test_status_t
draw (cairo_t *cr, int width, int height)
{
cairo_pattern_t *pattern;
cairo_set_source_rgb (cr, 1, 1, 1);
cairo_paint (cr);
cairo_translate (cr, PAD, PAD);
pattern = cairo_pattern_create_mesh ();
sector_patch (pattern,
0, 1, 0, 0,
M_PI/4, 1, 1, 0);
sector_patch (pattern,
M_PI/4, 0, 1, 0,
M_PI/2, 0, 1, 1);
sector_patch (pattern,
M_PI/2, 0, 0, 1,
3*M_PI/4, 1, 0, 1);
sector_patch (pattern,
3*M_PI/4, 1, 0, 0,
M_PI, 1, 1, 0);
sector_patch (pattern,
-M_PI, 1, 1, 0,
-3*M_PI/4, 0, 1, 0);
sector_patch (pattern,
-3*M_PI/4, 0, 1, 0,
-M_PI/2, 0, 1, 1);
sector_patch (pattern,
-M_PI/2, 0, 1, 1,
-M_PI/4, 0, 0, 1);
sector_patch (pattern,
-M_PI/4, 0, 0, 1,
0, 1, 0, 0);
cairo_set_source (cr, pattern);
cairo_paint (cr);
cairo_pattern_destroy (pattern);
return CAIRO_TEST_SUCCESS;
}
CAIRO_TEST (mesh_pattern_conical,
"Paint a conical pattern using a mesh pattern",
"conical, mesh, pattern", /* keywords */
NULL, /* requirements */
WIDTH, HEIGHT,
NULL, draw)
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