test/miter-precision.c

   1 /*
   2  * Copyright © 2007 Keith Packard
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it either under the terms of the GNU Lesser General Public
   6  * License version 2.1 as published by the Free Software Foundation
   7  * (the "LGPL") or, at your option, under the terms of the Mozilla
   8  * Public License Version 1.1 (the "MPL"). If you do not alter this
   9  * notice, a recipient may use your version of this file under either
  10  * the MPL or the LGPL.
  11  *
  12  * You should have received a copy of the LGPL along with this library
  13  * in the file COPYING-LGPL-2.1; if not, write to the Free Software
  14  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  15  * You should have received a copy of the MPL along with this library
  16  * in the file COPYING-MPL-1.1
  17  *
  18  * The contents of this file are subject to the Mozilla Public License
  19  * Version 1.1 (the "License"); you may not use this file except in
  20  * compliance with the License. You may obtain a copy of the License at
  21  * http://www.mozilla.org/MPL/
  22  *
  23  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
  24  * OF ANY KIND, either express or implied. See the LGPL or the MPL for
  25  * the specific language governing rights and limitations.
  26  *
  27  * The Original Code is the cairo graphics library.
  28  *
  29  * The Initial Developer of the Original Code is Keith Packard
  30  *
  31  * Contributor(s):
  32  *      Keith Packard <keithp@keithp.com>
  33  */
  34 #include "cairo-test.h"
  35
  36 static cairo_test_status_t
  37 draw (cairo_t *cr, int width, int height)
  38 {
  39     double  xscale, yscale;
  40     cairo_set_source_rgb (cr, 1, 1, 1);
  41     cairo_paint (cr);
  42
  43     cairo_set_source_rgb (cr, 0, 0, 0);
  44     cairo_set_miter_limit (cr, 100000);
  45     for (xscale = 1; xscale <= 1000; xscale += 999)
  46         for (yscale = 1; yscale <= 1000; yscale += 999)
  47         {
  48             double  max_scale = xscale > yscale ? xscale : yscale;
  49             cairo_save (cr);
  50             if (xscale > 1)
  51                 cairo_translate (cr, 50, 0);
  52             if (yscale > 1)
  53                 cairo_translate (cr, 0, 50);
  54             cairo_scale (cr, xscale, yscale);
  55             cairo_set_line_width (cr, 10.0 / max_scale);
  56             cairo_move_to (cr, 10.0 / xscale, 10.0 / yscale);
  57             cairo_line_to (cr, 40.0 / xscale, 10.0 / yscale);
  58             cairo_line_to (cr, 10.0 / xscale, 30.0 / yscale);
  59             cairo_stroke (cr);
  60             cairo_restore (cr);
  61         }
  62
  63     return CAIRO_TEST_SUCCESS;
  64 }
  65
  66 CAIRO_TEST (miter_precision,
  67             "test how cairo deals with small miters"
  68             "\ncurrent code draws inappropriate bevels at times",
  69             "stoke, stress", /* keywords */
  70             NULL, /* requirements */
  71             120, 100,
  72             NULL, draw)