test/close-path.c

   1 /*
   2  * Copyright © 2006 Red Hat, Inc.
   3  *
   4  * Permission to use, copy, modify, distribute, and sell this software
   5  * and its documentation for any purpose is hereby granted without
   6  * fee, provided that the above copyright notice appear in all copies
   7  * and that both that copyright notice and this permission notice
   8  * appear in supporting documentation, and that the name of
   9  * Red Hat, Inc. not be used in advertising or publicity pertaining to
  10  * distribution of the software without specific, written prior
  11  * permission. Red Hat, Inc. makes no representations about the
  12  * suitability of this software for any purpose.  It is provided "as
  13  * is" without express or implied warranty.
  14  *
  15  * RED HAT, INC. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
  16  * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
  17  * FITNESS, IN NO EVENT SHALL RED HAT, INC. BE LIABLE FOR ANY SPECIAL,
  18  * INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
  19  * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
  20  * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
  21  * IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  22  *
  23  * Author: Carl D. Worth <cworth@cworth.org>
  24  */
  25
  26 #include <stdlib.h>
  27 #include "cairo-test.h"
  28
  29 static cairo_test_draw_function_t draw;
  30
  31 static cairo_test_status_t
  32 draw (cairo_t *cr, int width, int height)
  33 {
  34     cairo_path_t *path;
  35
  36     /* We draw in the default black, so paint white first. */
  37     cairo_save (cr);
  38     cairo_set_source_rgb (cr, 1.0, 1.0, 1.0); /* white */
  39     cairo_paint (cr);
  40     cairo_restore (cr);
  41
  42     /* This curious approach for drawing a circle (starting with a
  43      * closed arc) exercises a bug in which the "last move point" was
  44      * not being set so the close_path closes to (0,0). */
  45     cairo_arc (cr, 8, 8, 4, 0, M_PI);
  46     cairo_close_path (cr);
  47     cairo_arc (cr, 8, 8, 4, M_PI, 2 * M_PI);
  48
  49     cairo_fill (cr);
  50
  51     cairo_translate (cr, 16, 0);
  52
  53     /* Here a curve immediately after a close_to will begin from (0,0)
  54      * when the path is obtained with cairo_copy_path_flat. */
  55     cairo_move_to (cr, 8, 4);
  56     cairo_arc_negative (cr, 8, 8, 4, 3 * M_PI / 2.0, M_PI / 2.0);
  57     cairo_close_path (cr);
  58     cairo_curve_to (cr,
  59                     12, 4,
  60                     12, 12,
  61                     8, 12);
  62
  63     path = cairo_copy_path_flat (cr);
  64     cairo_new_path (cr);
  65     cairo_append_path (cr, path);
  66     cairo_path_destroy (path);
  67
  68     cairo_fill (cr);
  69
  70     return CAIRO_TEST_SUCCESS;
  71 }
  72
  73 CAIRO_TEST (close_path,
  74             "Test some corner cases related to cairo_close_path",
  75             "path", /* keywords */
  76             NULL, /* requirements */
  77             32, 16,
  78             NULL, draw)