cairo/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 const cairo_test_t test = {
  32     "close-path",
  33     "Test some corner cases related to cairo_close_path",
  34     32, 16,
  35     draw
  36 };
  37
  38 static cairo_test_status_t
  39 draw (cairo_t *cr, int width, int height)
  40 {
  41     cairo_path_t *path;
  42
  43     /* We draw in the default black, so paint white first. */
  44     cairo_save (cr);
  45     cairo_set_source_rgb (cr, 1.0, 1.0, 1.0); /* white */
  46     cairo_paint (cr);
  47     cairo_restore (cr);
  48
  49     /* This curious approach for drawing a circle (starting with a
  50      * closed arc) exercises a bug in which the "last move point" was
  51      * not being set so the close_path closes to (0,0). */
  52     cairo_arc (cr, 8, 8, 4, 0, M_PI);
  53     cairo_close_path (cr);
  54     cairo_arc (cr, 8, 8, 4, M_PI, 2 * M_PI);
  55
  56     cairo_fill (cr);
  57
  58     cairo_translate (cr, 16, 0);
  59
  60     /* Here a curve immediately after a close_to will begin from (0,0)
  61      * when the path is obtained with cairo_copy_path_flat. */
  62     cairo_move_to (cr, 8, 4);
  63     cairo_arc_negative (cr, 8, 8, 4, 3 * M_PI / 2.0, M_PI / 2.0);
  64     cairo_close_path (cr);
  65     cairo_curve_to (cr,
  66                     12, 4,
  67                     12, 12,
  68                     8, 12);
  69
  70     path = cairo_copy_path_flat (cr);
  71     cairo_new_path (cr);
  72     cairo_append_path (cr, path);
  73     cairo_path_destroy (path);
  74
  75     cairo_fill (cr);
  76
  77     return CAIRO_TEST_SUCCESS;
  78 }
  79
  80 int
  81 main (void)
  82 {
  83     return cairo_test (&test);
  84 }