| /* |
| * Copyright © 2008 Chris Wilson |
| * |
| * Permission to use, copy, modify, distribute, and sell this software |
| * and its documentation for any purpose is hereby granted without |
| * fee, provided that the above copyright notice appear in all copies |
| * and that both that copyright notice and this permission notice |
| * appear in supporting documentation, and that the name of |
| * Chris Wilson not be used in advertising or publicity pertaining to |
| * distribution of the software without specific, written prior |
| * permission. Chris Wilson makes no representations about the |
| * suitability of this software for any purpose. It is provided "as |
| * is" without express or implied warranty. |
| * |
| * CHRIS WILSON DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS |
| * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND |
| * FITNESS, IN NO EVENT SHALL CHRIS WILSON BE LIABLE FOR ANY SPECIAL, |
| * INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER |
| * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION |
| * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR |
| * IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
| * |
| * Author: Chris Wilson <chris@chris-wilson.co.uk> |
| */ |
| |
| /* This test case exercises a "Potential division by zero in cairo_arc" |
| * reported by Luiz Americo Pereira Camara <luizmed@oi.com.br>, |
| * http://lists.cairographics.org/archives/cairo/2008-May/014054.html. |
| */ |
| |
| #include "cairo-test.h" |
| |
| static cairo_test_status_t |
| draw (cairo_t *cr, int width, int height) |
| { |
| int n; |
| |
| cairo_set_source_rgb (cr, 1, 1, 1); |
| cairo_paint (cr); |
| |
| cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND); |
| |
| cairo_set_line_width (cr, 5); |
| cairo_set_source_rgb (cr, 0, 1, 0); |
| for (n = 0; n < 8; n++) { |
| double theta = n * 2 * M_PI / 8; |
| cairo_new_sub_path (cr); |
| cairo_arc (cr, 20, 20, 15, theta, theta); |
| cairo_close_path (cr); |
| } |
| cairo_stroke (cr); |
| |
| cairo_set_line_width (cr, 2); |
| cairo_set_source_rgb (cr, 0, 0, 1); |
| for (n = 0; n < 8; n++) { |
| double theta = n * 2 * M_PI / 8; |
| cairo_move_to (cr, 20, 20); |
| cairo_arc (cr, 20, 20, 15, theta, theta); |
| } |
| cairo_stroke (cr); |
| |
| cairo_set_source_rgb (cr, 1, 0, 0); |
| cairo_arc (cr, 20, 20, 2, 0, 2*M_PI); |
| cairo_fill (cr); |
| |
| return CAIRO_TEST_SUCCESS; |
| } |
| |
| CAIRO_TEST (degenerate_arc, |
| "Tests the behaviour of degenerate arcs", |
| "degenerate", /* keywords */ |
| NULL, /* requirements */ |
| 40, 40, |
| NULL, draw) |