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fc011bfcb9
Debate rages as to the correct way to handle this. In some ways the current output is expected due to the numerical instability in handling the inner-focus-on-the-outer-circle. However, the result looks less than desirable so some solution (which may not be inside cairo per-se) is sought.
72 lines
2.2 KiB
C
72 lines
2.2 KiB
C
/*
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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: Krzysztof Kosi\u0144ski <tweenk.pl@gmail.com>
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*/
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/* Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=40918 */
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#include "cairo-test.h"
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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 *radial;
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double angle;
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int i, j;
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cairo_set_source_rgb (cr, 0, 0, 1);
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cairo_paint (cr);
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angle = 0.0;
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for (i = 0; i < 4; i++) {
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for (j = 0; j < 4; j++) {
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cairo_save (cr);
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cairo_rectangle (cr, 100*i, 100*j, 100, 100);
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cairo_clip (cr);
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radial = cairo_pattern_create_radial (cos (angle), sin (angle), 0,
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0, 0, 1);
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cairo_pattern_add_color_stop_rgb (radial, 0.0, 1, 0, 0);
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cairo_pattern_add_color_stop_rgb (radial, 1.0, 0, 1, 0);
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cairo_translate (cr, 100*i+50, 100*j+50);
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cairo_scale (cr, 50, -50);
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cairo_set_source (cr, radial);
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cairo_pattern_destroy (radial);
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cairo_paint(cr);
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cairo_restore (cr);
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angle += M_PI/17;
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}
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}
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return CAIRO_TEST_SUCCESS;
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}
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CAIRO_TEST (radial_outer_focus,
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"Exercises the condition of rendering a radial gradial on its outer focus",
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"radial", /* keywords */
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NULL, /* requirements */
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400, 400,
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NULL, draw)
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