test/transforms.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 Worth <cworth@cworth.org>
  24  */
  25
  26 #include "cairo-test.h"
  27
  28 #define WIDTH 45
  29 #define HEIGHT 30
  30
  31 static cairo_test_draw_function_t draw;
  32
  33 cairo_test_t test = {
  34     "transforms",
  35     "Test various transformations.",
  36     WIDTH, HEIGHT,
  37     draw
  38 };
  39
  40 static void
  41 draw_L_shape (cairo_t *cr)
  42 {
  43     cairo_move_to (cr, 0, 0);
  44     cairo_rel_line_to (cr, 0, 10);
  45     cairo_rel_line_to (cr, 5, 0);
  46
  47     cairo_save (cr);
  48     cairo_identity_matrix (cr);
  49     cairo_set_line_width (cr, 2.0);
  50     cairo_stroke (cr);
  51     cairo_restore (cr);
  52 }
  53
  54 static cairo_test_status_t
  55 draw (cairo_t *cr, int width, int height)
  56 {
  57     /* We draw in the default black, so paint white first. */
  58     cairo_save (cr);
  59     cairo_set_source_rgb (cr, 1.0, 1.0, 1.0); /* white */
  60     cairo_paint (cr);
  61     cairo_restore (cr);
  62
  63     cairo_translate (cr, 5, 5);
  64
  65     draw_L_shape (cr);
  66
  67     cairo_translate (cr, 10, 0);
  68
  69     cairo_save (cr);
  70     {
  71         cairo_scale (cr, 2, 2);
  72         draw_L_shape (cr);
  73     }
  74     cairo_restore (cr);
  75
  76     cairo_translate (cr, 15, 0);
  77
  78     cairo_save (cr);
  79     {
  80         cairo_rotate (cr, M_PI / 2.0);
  81         draw_L_shape (cr);
  82     }
  83     cairo_restore (cr);
  84
  85     cairo_translate (cr, 5, 0);
  86
  87     cairo_save (cr);
  88     {
  89         cairo_matrix_t skew_y = {
  90             1, -1,
  91             0,  1,
  92             0,  0
  93         };
  94         cairo_transform (cr, &skew_y);
  95         draw_L_shape (cr);
  96     }
  97     cairo_restore (cr);
  98
  99     cairo_translate (cr, 5, 10);
 100
 101     cairo_save (cr);
 102     {
 103         cairo_matrix_t skew_x = {
 104              1.0, 0.0,
 105             -0.5, 1.0,
 106              0.0, 0.0
 107         };
 108         cairo_transform (cr, &skew_x);
 109         draw_L_shape (cr);
 110     }
 111     cairo_restore (cr);
 112
 113     return CAIRO_TEST_SUCCESS;
 114 }
 115
 116 int
 117 main (void)
 118 {
 119     return cairo_test (&test);
 120 }