/* $Id: geometry.h,v 1.7 2011/01/25 16:30:49 ellson Exp $ $Revision: 1.7 $ */
/* vim:set shiftwidth=4 ts=8: */

/*************************************************************************
 * Copyright (c) 2011 AT&T Intellectual Property 
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors: See CVS logs. Details at http://www.graphviz.org/
 *************************************************************************/

#ifdef __cplusplus
extern "C" {
#endif



#ifndef GEOMETRY_H
#define GEOMETRY_H

#ifdef HAVE_POINTF_S
    typedef pointf Point;
#else
    typedef struct Point {
	double x, y;
    } Point;
#endif

    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
