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mesh-pattern tests a mesh pattern with non-opaque two overlapping patches. mesh-pattern-accuracy tests the accuracy of the color computed in each point of a patch. It can point out defects in rasterizers which rely on mesh subdivision only use the mesh shape instead of both shape and color to decide when the tensor-product patches can be approximated with Gouraud-shaded triangles. mesh-pattern-conical is an example of how a conical gradient can be approximated with a mesh pattern. mesh-pattern-control-points tests a mesh pattern with control points in non-default position to verify that their position affects the color as expected. mesh-pattern-fold tests a mesh pattern with a patch which folds along both sides. mesh-pattern-overlap tests a mesh pattern with a patch which folds along just one side. mesh-pattern-transformed tests a mesh pattern with non-identity transform matrix.
135 lines
3.8 KiB
C
135 lines
3.8 KiB
C
/*
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* Copyright © 2009 Adrian Johnson
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy,
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* modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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* Author: Adrian Johnson <ajohnson@redneon.com>
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*/
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#include "cairo-test.h"
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#include <math.h>
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#define PAT_WIDTH 100
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#define PAT_HEIGHT 100
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#define SIZE PAT_WIDTH
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#define PAD 2
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#define WIDTH (PAD + SIZE + PAD)
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#define HEIGHT WIDTH
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/*
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* This test is designed to paint a mesh pattern which contains 8
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* circular sectors approximating a conical gradient.
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*/
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#define CENTER_X 50
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#define CENTER_Y 50
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#define RADIUS 50
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static void
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sector_patch (cairo_pattern_t *pattern,
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double angle_A,
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double A_r, double A_g, double A_b,
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double angle_B,
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double B_r, double B_g, double B_b)
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{
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double r_sin_A, r_cos_A;
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double r_sin_B, r_cos_B;
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double h;
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r_sin_A = RADIUS * sin (angle_A);
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r_cos_A = RADIUS * cos (angle_A);
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r_sin_B = RADIUS * sin (angle_B);
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r_cos_B = RADIUS * cos (angle_B);
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h = 4.0/3.0 * tan ((angle_B - angle_A) / 4.0);
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cairo_pattern_mesh_begin_patch (pattern);
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cairo_pattern_mesh_move_to (pattern, CENTER_X, CENTER_Y);
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cairo_pattern_mesh_line_to (pattern,
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CENTER_X + r_cos_A,
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CENTER_Y + r_sin_A);
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cairo_pattern_mesh_curve_to (pattern,
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CENTER_X + r_cos_A - h * r_sin_A,
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CENTER_Y + r_sin_A + h * r_cos_A,
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CENTER_X + r_cos_B + h * r_sin_B,
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CENTER_Y + r_sin_B - h * r_cos_B,
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CENTER_X + r_cos_B,
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CENTER_Y + r_sin_B);
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cairo_pattern_mesh_set_corner_color_rgb (pattern, 0, 1, 1, 1);
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cairo_pattern_mesh_set_corner_color_rgb (pattern, 1, A_r, A_g, A_b);
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cairo_pattern_mesh_set_corner_color_rgb (pattern, 2, B_r, B_g, B_b);
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cairo_pattern_mesh_end_patch (pattern);
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}
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static cairo_test_status_t
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draw (cairo_t *cr, int width, int height)
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{
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cairo_pattern_t *pattern;
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cairo_set_source_rgb (cr, 1, 1, 1);
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cairo_paint (cr);
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cairo_translate (cr, PAD, PAD);
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pattern = cairo_pattern_create_mesh ();
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sector_patch (pattern,
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0, 1, 0, 0,
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M_PI/4, 1, 1, 0);
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sector_patch (pattern,
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M_PI/4, 0, 1, 0,
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M_PI/2, 0, 1, 1);
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sector_patch (pattern,
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M_PI/2, 0, 0, 1,
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3*M_PI/4, 1, 0, 1);
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sector_patch (pattern,
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3*M_PI/4, 1, 0, 0,
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M_PI, 1, 1, 0);
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sector_patch (pattern,
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-M_PI, 1, 1, 0,
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-3*M_PI/4, 0, 1, 0);
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sector_patch (pattern,
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-3*M_PI/4, 0, 1, 0,
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-M_PI/2, 0, 1, 1);
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sector_patch (pattern,
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-M_PI/2, 0, 1, 1,
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-M_PI/4, 0, 0, 1);
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sector_patch (pattern,
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-M_PI/4, 0, 0, 1,
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0, 1, 0, 0);
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cairo_set_source (cr, pattern);
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cairo_paint (cr);
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cairo_pattern_destroy (pattern);
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return CAIRO_TEST_SUCCESS;
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}
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CAIRO_TEST (mesh_pattern_conical,
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"Paint a conical pattern using a mesh pattern",
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"conical,mesh,pattern", /* keywords */
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NULL, /* requirements */
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WIDTH, HEIGHT,
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NULL, draw)
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