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Diffstat (limited to 'test/shape-general-convex.c')
| -rw-r--r-- | test/shape-general-convex.c | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/test/shape-general-convex.c b/test/shape-general-convex.c new file mode 100644 index 000000000..b9241bb9f --- /dev/null +++ b/test/shape-general-convex.c @@ -0,0 +1,88 @@ +/* + * 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) |