geometry.h

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/*************************************************************************
 * 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
 * https://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors: Details at https://graphviz.org
 *************************************************************************/
 
#pragma once
 
#include <stddef.h>
 
#ifdef __cplusplus
extern "C" {
#endif
 
#ifdef HAVE_POINTF_S
    typedef pointf Point;
#else
    typedef struct Point {
        double x, y;
    } Point;
#endif
 
    extern double xmin, xmax, ymin, ymax;       /* extreme x,y values of sites */
    extern double deltax;       // xmax - xmin
 
    extern size_t nsites; // Number of sites
    extern int sqrt_nsites;
 
    extern void geominit(void);
    extern double dist_2(Point, Point); 
    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);
 
#ifdef __cplusplus
}
#endif