-
Notifications
You must be signed in to change notification settings - Fork 0
/
gpc.h
133 lines (99 loc) · 4.79 KB
/
gpc.h
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
/*
===========================================================================
Project: Generic Polygon Clipper
A new algorithm for calculating the difference, intersection,
exclusive-or or union of arbitrary polygon sets.
File: gpc.h
Author: Alan Murta (email: gpc@cs.man.ac.uk)
Version: 2.32
Date: 17th December 2004
Copyright: (C) Advanced Interfaces Group,
University of Manchester.
This software is free for non-commercial use. It may be copied,
modified, and redistributed provided that this copyright notice
is preserved on all copies. The intellectual property rights of
the algorithms used reside with the University of Manchester
Advanced Interfaces Group.
You may not use this software, in whole or in part, in support
of any commercial product without the express consent of the
author.
There is no warranty or other guarantee of fitness of this
software for any purpose. It is provided solely "as is".
===========================================================================
*/
#ifndef __gpc_h
#define __gpc_h
#include <stdio.h>
/*
===========================================================================
Constants
===========================================================================
*/
/* Increase GPC_EPSILON to encourage merging of near coincident edges */
#define GPC_EPSILON (DBL_EPSILON)
#define GPC_VERSION "2.32"
/*
===========================================================================
Public Data Types
===========================================================================
*/
typedef enum /* Set operation type */
{
GPC_DIFF, /* Difference */
GPC_INT, /* Intersection */
GPC_XOR, /* Exclusive or */
GPC_UNION /* Union */
} gpc_op;
typedef struct /* Polygon vertex structure */
{
double x; /* Vertex x component */
double y; /* vertex y component */
} gpc_vertex;
typedef struct /* Vertex list structure */
{
int num_vertices; /* Number of vertices in list */
gpc_vertex *vertex; /* Vertex array pointer */
} gpc_vertex_list;
typedef struct /* Polygon set structure */
{
int num_contours; /* Number of contours in polygon */
int *hole; /* Hole / external contour flags */
gpc_vertex_list *contour; /* Contour array pointer */
} gpc_polygon;
typedef struct /* Tristrip set structure */
{
int num_strips; /* Number of tristrips */
gpc_vertex_list *strip; /* Tristrip array pointer */
} gpc_tristrip;
/*
===========================================================================
Public Function Prototypes
===========================================================================
*/
void gpc_read_polygon (FILE *infile_ptr,
int read_hole_flags,
gpc_polygon *polygon);
void gpc_write_polygon (FILE *outfile_ptr,
int write_hole_flags,
gpc_polygon *polygon);
void gpc_add_contour (gpc_polygon *polygon,
gpc_vertex_list *contour,
int hole);
void gpc_polygon_clip (gpc_op set_operation,
gpc_polygon *subject_polygon,
gpc_polygon *clip_polygon,
gpc_polygon *result_polygon);
void gpc_tristrip_clip (gpc_op set_operation,
gpc_polygon *subject_polygon,
gpc_polygon *clip_polygon,
gpc_tristrip *result_tristrip);
void gpc_polygon_to_tristrip (gpc_polygon *polygon,
gpc_tristrip *tristrip);
void gpc_free_polygon (gpc_polygon *polygon);
void gpc_free_tristrip (gpc_tristrip *tristrip);
#endif
/*
===========================================================================
End of file: gpc.h
===========================================================================
*/