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
|
/* $Id: geometry.h,v 1.2 2005/02/24 00:57:33 ellson Exp $ $Revision: 1.2 $ */
/* vim:set shiftwidth=4 ts=8: */
/**********************************************************
* This software is part of the graphviz package *
* http://www.graphviz.org/ *
* *
* Copyright (c) 1994-2004 AT&T Corp. *
* and is licensed under the *
* Common Public License, Version 1.0 *
* by AT&T Corp. *
* *
* Information and Software Systems Research *
* AT&T Research, Florham Park NJ *
**********************************************************/
#ifdef __cplusplus
extern "C" {
#endif
#ifndef GEOMETRY_H
#define GEOMETRY_H
typedef struct Point {
double x, y;
} Point;
extern Point origin;
extern double xmin, xmax, ymin, ymax; /* extreme x,y values of sites */
extern double deltax, deltay; /* xmax - xmin, ymax - ymin */
extern int nsites; /* Number of sites */
extern int sqrt_nsites;
extern void geominit(void);
extern double dist_2(Point *, Point *); /* Distance squared between two points */
extern void subPt(Point * a, Point b, Point c);
extern void addPt(Point * a, Point b, Point c);
extern double area_2(Point a, Point b, Point c);
extern int leftOf(Point a, Point b, Point c);
extern int intersection(Point a, Point b, Point c, Point d, Point * p);
#endif
#ifdef __cplusplus
}
#endif
|
