test/long-lines.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  * Authors: Carl D. Worth <cworth@cworth.org>
  24  *          Emmanuel Pacaud <emmanuel.pacaud@lapp.in2p3.fr>
  25  */
  26
  27 #include "cairo-test.h"
  28
  29 #define LINE_WIDTH      1.
  30 #define SIZE            10
  31 #define LINE_NBR        6
  32
  33 static cairo_test_draw_function_t draw;
  34
  35 cairo_test_t test = {
  36     "long-lines",
  37     "Test long lines"
  38     "\nLong lines are not drawn due to the limitations of the internal 16.16 fixed-point coordinates",
  39     SIZE * (LINE_NBR + 1),
  40     SIZE * (LINE_NBR + 1),
  41     draw
  42 };
  43
  44 struct {
  45     double length;
  46     double red, green, blue;
  47 } lines[LINE_NBR] = {
  48     {      100.0, 1.0, 0.0, 0.0 },
  49     {    10000.0, 0.0, 1.0, 0.0 },
  50     {   100000.0, 0.0, 0.0, 1.0 },
  51     {  1000000.0, 1.0, 1.0, 0.0 },
  52     { 10000000.0, 0.0, 1.0, 1.0 },
  53     {100000000.0, 1.0, 0.0, 1.0 }
  54 };
  55
  56 static cairo_test_status_t
  57 draw (cairo_t *cr, int width, int height)
  58 {
  59     double pos;
  60     int i;
  61
  62     /* We draw in the default black, so paint white first. */
  63     cairo_save (cr);
  64     cairo_set_source_rgb (cr, 1.0, 1.0, 1.0); /* white */
  65     cairo_paint (cr);
  66     cairo_restore (cr);
  67
  68
  69     cairo_set_line_width (cr, LINE_WIDTH);
  70
  71     pos = SIZE + .5;
  72     for (i = 0; i < LINE_NBR; i++) {
  73         cairo_move_to (cr, pos, -lines[i].length);
  74         cairo_line_to (cr, pos, +lines[i].length);
  75         cairo_set_source_rgb (cr, lines[i].red, lines[i].green, lines[i].blue);
  76         cairo_stroke (cr);
  77         pos += SIZE;
  78     }
  79
  80     /* This should display a perfect vertically centered black line */
  81     cairo_move_to (cr, 0.5, -1e100);
  82     cairo_line_to (cr, pos,  1e100);
  83     cairo_set_source_rgb (cr, 0.0, 0.0, 0.0);
  84     cairo_stroke (cr);
  85
  86     return CAIRO_TEST_SUCCESS;
  87 }
  88
  89 int
  90 main (void)
  91 {
  92     return cairo_test (&test);
  93 }