Graphviz: lib/neatogen/geometry.h Source File

Graphviz 2.29.20120524.0446
00001 /* $Id$ $Revision$ */
00002 /* vim:set shiftwidth=4 ts=8: */
00003 
00004 /*************************************************************************
00005  * Copyright (c) 2011 AT&T Intellectual Property 
00006  * All rights reserved. This program and the accompanying materials
00007  * are made available under the terms of the Eclipse Public License v1.0
00008  * which accompanies this distribution, and is available at
00009  * http://www.eclipse.org/legal/epl-v10.html
00010  *
00011  * Contributors: See CVS logs. Details at http://www.graphviz.org/
00012  *************************************************************************/
00013 
00014 #ifdef __cplusplus
00015 extern "C" {
00016 #endif
00017 
00018 
00019 
00020 #ifndef GEOMETRY_H
00021 #define GEOMETRY_H
00022 
00023 #ifdef HAVE_POINTF_S
00024     typedef pointf Point;
00025 #else
00026     typedef struct Point {
00027         double x, y;
00028     } Point;
00029 #endif
00030 
00031     extern Point origin;
00032 
00033     extern double xmin, xmax, ymin, ymax;       /* extreme x,y values of sites */
00034     extern double deltax, deltay;       /* xmax - xmin, ymax - ymin */
00035 
00036     extern int nsites;          /* Number of sites */
00037     extern int sqrt_nsites;
00038 
00039     extern void geominit(void);
00040     extern double dist_2(Point *, Point *);     /* Distance squared between two points */
00041     extern void subpt(Point * a, Point b, Point c);
00042     extern void addpt(Point * a, Point b, Point c);
00043     extern double area_2(Point a, Point b, Point c);
00044     extern int leftOf(Point a, Point b, Point c);
00045     extern int intersection(Point a, Point b, Point c, Point d, Point * p);
00046 
00047 #endif
00048 
00049 
00050 #ifdef __cplusplus
00051 }
00052 #endif