test/dash-scale.c

   1 /*
   2  * Copyright © 2005 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 "cairo-test.h"
  27
  28 #define LINE_WIDTH      8.
  29 #define SIZE            (5 * LINE_WIDTH)
  30 #define PAD             (2 * LINE_WIDTH)
  31
  32 static void
  33 make_path (cairo_t *cr)
  34 {
  35     cairo_move_to (cr, 0., 0.);
  36     cairo_rel_line_to (cr, 0., SIZE);
  37     cairo_rel_line_to (cr, SIZE, 0.);
  38     cairo_close_path (cr);
  39
  40     cairo_move_to (cr, 2 * LINE_WIDTH, 0.);
  41     cairo_rel_line_to (cr, 3 * LINE_WIDTH, 0.);
  42     cairo_rel_line_to (cr, 0., 3 * LINE_WIDTH);
  43 }
  44
  45 static void
  46 draw_three_shapes (cairo_t *cr)
  47 {
  48     cairo_save (cr);
  49
  50     make_path (cr);
  51     cairo_set_line_cap (cr, CAIRO_LINE_CAP_BUTT);
  52     cairo_set_line_join (cr, CAIRO_LINE_JOIN_BEVEL);
  53     cairo_stroke (cr);
  54
  55     cairo_translate (cr, SIZE + PAD, 0.);
  56
  57     make_path (cr);
  58     cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND);
  59     cairo_set_line_join (cr, CAIRO_LINE_JOIN_ROUND);
  60     cairo_stroke (cr);
  61
  62     cairo_translate (cr, SIZE + PAD, 0.);
  63
  64     make_path (cr);
  65     cairo_set_line_cap (cr, CAIRO_LINE_CAP_SQUARE);
  66     cairo_set_line_join (cr, CAIRO_LINE_JOIN_MITER);
  67     cairo_stroke (cr);
  68
  69     cairo_restore (cr);
  70 }
  71
  72 static cairo_test_status_t
  73 draw (cairo_t *cr, int width, int height)
  74 {
  75     double dash[] = {1.5 * LINE_WIDTH};
  76
  77     /* We draw in the default black, so paint white first. */
  78     cairo_save (cr);
  79     cairo_set_source_rgb (cr, 1.0, 1.0, 1.0); /* white */
  80     cairo_paint (cr);
  81     cairo_restore (cr);
  82
  83     cairo_translate (cr, PAD, PAD);
  84
  85     cairo_set_dash (cr, dash, sizeof(dash)/sizeof(dash[0]), - 2 * LINE_WIDTH);
  86     cairo_set_line_width (cr, LINE_WIDTH);
  87     draw_three_shapes (cr);
  88
  89     cairo_translate (cr, 0, SIZE + 2 * PAD);
  90
  91     cairo_save (cr);
  92     {
  93         cairo_set_dash (cr, dash, sizeof(dash)/sizeof(dash[0]), - 2 * LINE_WIDTH);
  94         cairo_set_line_width (cr, LINE_WIDTH);
  95         cairo_scale (cr, 1, 2);
  96         draw_three_shapes (cr);
  97     }
  98     cairo_restore (cr);
  99
 100     cairo_translate (cr, 0, 2 * (SIZE + PAD));
 101
 102     cairo_save (cr);
 103     {
 104         cairo_scale (cr, 1, 2);
 105         cairo_set_dash (cr, dash, sizeof(dash)/sizeof(dash[0]), - 2 * LINE_WIDTH);
 106         cairo_set_line_width (cr, LINE_WIDTH);
 107         draw_three_shapes (cr);
 108     }
 109     cairo_restore (cr);
 110
 111     return CAIRO_TEST_SUCCESS;
 112 }
 113
 114 CAIRO_TEST (dash_scale,
 115             "Test interactions of cairo_set_dash and cairo_scale, (in particular with a non-uniformly scaled pen)",
 116             "dash, stroke, transform", /* keywords */
 117             NULL, /* requirements */
 118             3 * (PAD + SIZE) + PAD,
 119             PAD + 5 * SIZE + 2 * (2 * PAD) + PAD,
 120             NULL, draw)