/misc/src/release/graphviz-2.18-1/src/graphviz-2.18/lib/neatogen/geometry.h

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00001 /* $Id: geometry.h,v 1.2 2005/02/24 00:57:33 ellson Exp $ $Revision: 1.2 $ */
00002 /* vim:set shiftwidth=4 ts=8: */
00003 
00004 /**********************************************************
00005 *      This software is part of the graphviz package      *
00006 *                http://www.graphviz.org/                 *
00007 *                                                         *
00008 *            Copyright (c) 1994-2004 AT&T Corp.           *
00009 *                and is licensed under the                *
00010 *            Common Public License, Version 1.0           *
00011 *                      by AT&T Corp.                      *
00012 *                                                         *
00013 *        Information and Software Systems Research        *
00014 *              AT&T Research, Florham Park NJ             *
00015 **********************************************************/
00016 
00017 #ifdef __cplusplus
00018 extern "C" {
00019 #endif
00020 
00021 
00022 
00023 #ifndef GEOMETRY_H
00024 #define GEOMETRY_H
00025 
00026     typedef struct Point {
00027         double x, y;
00028     } Point;
00029 
00030     extern Point origin;
00031 
00032     extern double xmin, xmax, ymin, ymax;       /* extreme x,y values of sites */
00033     extern double deltax, deltay;       /* xmax - xmin, ymax - ymin */
00034 
00035     extern int nsites;          /* Number of sites */
00036     extern int sqrt_nsites;
00037 
00038     extern void geominit(void);
00039     extern double dist_2(Point *, Point *);     /* Distance squared between two points */
00040     extern void subPt(Point * a, Point b, Point c);
00041     extern void addPt(Point * a, Point b, Point c);
00042     extern double area_2(Point a, Point b, Point c);
00043     extern int leftOf(Point a, Point b, Point c);
00044     extern int intersection(Point a, Point b, Point c, Point d, Point * p);
00045 
00046 #endif
00047 
00048 
00049 #ifdef __cplusplus
00050 }
00051 #endif

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