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 cairo_test_draw_function_t draw;
  33
  34 cairo_test_t test = {
  35     "dash-scale",
  36     "Test interactions of cairo_set_dash and cairo_scale, (in particular with a non-uniformly scaled pen)",
  37     3 * (PAD + SIZE) + PAD,
  38     PAD + 5 * SIZE + 2 * (2 * PAD) + PAD,
  39     draw
  40 };
  41
  42 static void
  43 make_path (cairo_t *cr)
  44 {
  45     cairo_move_to (cr, 0., 0.);
  46     cairo_rel_line_to (cr, 0., SIZE);
  47     cairo_rel_line_to (cr, SIZE, 0.);
  48     cairo_close_path (cr);
  49
  50     cairo_move_to (cr, 2 * LINE_WIDTH, 0.);
  51     cairo_rel_line_to (cr, 3 * LINE_WIDTH, 0.);
  52     cairo_rel_line_to (cr, 0., 3 * LINE_WIDTH);
  53 }
  54
  55 static void
  56 draw_three_shapes (cairo_t *cr)
  57 {
  58     cairo_save (cr);
  59
  60     make_path (cr);
  61     cairo_set_line_cap (cr, CAIRO_LINE_CAP_BUTT);
  62     cairo_set_line_join (cr, CAIRO_LINE_JOIN_BEVEL);
  63     cairo_stroke (cr);
  64
  65     cairo_translate (cr, SIZE + PAD, 0.);
  66
  67     make_path (cr);
  68     cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND);
  69     cairo_set_line_join (cr, CAIRO_LINE_JOIN_ROUND);
  70     cairo_stroke (cr);
  71
  72     cairo_translate (cr, SIZE + PAD, 0.);
  73
  74     make_path (cr);
  75     cairo_set_line_cap (cr, CAIRO_LINE_CAP_SQUARE);
  76     cairo_set_line_join (cr, CAIRO_LINE_JOIN_MITER);
  77     cairo_stroke (cr);
  78
  79     cairo_restore (cr);
  80 }
  81
  82 static cairo_test_status_t
  83 draw (cairo_t *cr, int width, int height)
  84 {
  85     double dash[] = {1.5 * LINE_WIDTH};
  86
  87     /* We draw in the default black, so paint white first. */
  88     cairo_save (cr);
  89     cairo_set_source_rgb (cr, 1.0, 1.0, 1.0); /* white */
  90     cairo_paint (cr);
  91     cairo_restore (cr);
  92
  93     cairo_translate (cr, PAD, PAD);
  94
  95     cairo_set_dash (cr, dash, sizeof(dash)/sizeof(dash[0]), - 2 * LINE_WIDTH);
  96     cairo_set_line_width (cr, LINE_WIDTH);
  97     draw_three_shapes (cr);
  98
  99     cairo_translate (cr, 0, SIZE + 2 * PAD);
 100
 101     cairo_save (cr);
 102     {
 103         cairo_set_dash (cr, dash, sizeof(dash)/sizeof(dash[0]), - 2 * LINE_WIDTH);
 104         cairo_set_line_width (cr, LINE_WIDTH);
 105         cairo_scale (cr, 1, 2);
 106         draw_three_shapes (cr);
 107     }
 108     cairo_restore (cr);
 109
 110     cairo_translate (cr, 0, 2 * (SIZE + PAD));
 111
 112     cairo_save (cr);
 113     {
 114         cairo_scale (cr, 1, 2);
 115         cairo_set_dash (cr, dash, sizeof(dash)/sizeof(dash[0]), - 2 * LINE_WIDTH);
 116         cairo_set_line_width (cr, LINE_WIDTH);
 117         draw_three_shapes (cr);
 118     }
 119     cairo_restore (cr);
 120
 121     return CAIRO_TEST_SUCCESS;
 122 }
 123
 124 int
 125 main (void)
 126 {
 127     return cairo_test (&test);
 128 }