/[zanavi_public1]/navit/navit/maptool/refine/line.h
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Revision 31 - (show annotations) (download)
Mon Feb 4 17:41:59 2013 UTC (11 years, 1 month ago) by zoff99
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new map version, lots of fixes and experimental new features
1 /*
2 * This file is a part of Poly2Tri-C
3 * (c) Barak Itkin <lightningismyname@gmail.com>
4 * http://code.google.com/p/poly2tri-c/
5 *
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without modification,
9 * are permitted provided that the following conditions are met:
10 *
11 * * Redistributions of source code must retain the above copyright notice,
12 * this list of conditions and the following disclaimer.
13 * * Redistributions in binary form must reproduce the above copyright notice,
14 * this list of conditions and the following disclaimer in the documentation
15 * and/or other materials provided with the distribution.
16 * * Neither the name of Poly2Tri nor the names of its contributors may be
17 * used to endorse or promote products derived from this software without specific
18 * prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
23 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
24 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
25 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
26 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
27 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
28 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
29 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
30 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 */
32
33 #ifndef __P2TC_REFINE_LINE_H__
34 #define __P2TC_REFINE_LINE_H__
35
36 #include <glib.h>
37 #include "vector2.h"
38
39 /* A line is the equation of the following form:
40 * a * X + b * Y + c = 0
41 */
42 typedef struct {
43 gdouble a, b, c;
44 } P2trLine;
45
46 typedef enum
47 {
48 P2TR_LINE_RELATION_INTERSECTING = 0,
49 P2TR_LINE_RELATION_PARALLEL = 1,
50 P2TR_LINE_RELATION_SAME = 2
51 } P2trLineRelation;
52
53 void p2tr_line_init (P2trLine *line,
54 gdouble a,
55 gdouble b,
56 gdouble c);
57
58 gboolean p2tr_line_different_sides (const P2trLine *line,
59 const P2trVector2 *pt1,
60 const P2trVector2 *pt2);
61
62 P2trLineRelation p2tr_line_intersection (const P2trLine *l1,
63 const P2trLine *l2,
64 P2trVector2 *out_intersection);
65
66 #endif

   
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