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VoronoiDiagramGenerator.h

/*
* The author of this software is Steven Fortune.  Copyright (c) 1994 by AT&T
* Bell Laboratories.
* Permission to use, copy, modify, and distribute this software for any
* purpose without fee is hereby granted, provided that this entire notice
* is included in all copies of any software which is or includes a copy
* or modification of this software and in all copies of the supporting
* documentation for such software.
* THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTY.  IN PARTICULAR, NEITHER THE AUTHORS NOR AT&T MAKE ANY
* REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE MERCHANTABILITY
* OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE.
*/

/* 
* This code was originally written by Stephan Fortune in C code.  I, Shane O'Sullivan, 
* have since modified it, encapsulating it in a C++ class and, fixing memory leaks and 
* adding accessors to the Voronoi Edges.
* Permission to use, copy, modify, and distribute this software for any
* purpose without fee is hereby granted, provided that this entire notice
* is included in all copies of any software which is or includes a copy
* or modification of this software and in all copies of the supporting
* documentation for such software.
* THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTY.  IN PARTICULAR, NEITHER THE AUTHORS NOR AT&T MAKE ANY
* REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE MERCHANTABILITY
* OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE.
*/

#ifndef VORONOI_DIAGRAM_GENERATOR
#define VORONOI_DIAGRAM_GENERATOR

#include "Python.h"
#include "numpy/arrayobject.h"

#include <math.h>
#include <stdlib.h>
#include <string.h>
#include <iostream>


#ifndef NULL
#define NULL 0
#endif
#define DELETED -2

#define le 0
#define re 1

#ifndef MAX
#define MAX(x, y) (x > y ? x: y)
#endif

struct Freenode    
{
    struct Freenode *nextfree;
};

struct FreeNodeArrayList
{
    struct Freenode* memory;
    struct FreeNodeArrayList* next;

};

struct Freelist    
{
    struct Freenode *head;
    int nodesize;
};

struct Point    
{
    double x,y;
};

// structure used both for sites and for vertices 
struct Site    
{
    struct Point coord;
    int sitenbr;
    int refcnt;
};



struct Edge    
{
    double a,b,c;
    struct Site *ep[2];
    struct Site *reg[2];
    int edgenbr;
};

struct EdgeList 
{
    double a,b,c;
    int ep0nbr;
    double ep0x, ep0y;
    int ep1nbr;
    double ep1x, ep1y;
    int reg0nbr;
    int reg1nbr;
    int edgenbr;
    struct EdgeList *next;
};

struct GraphEdge
{
    double x1,y1,x2,y2;
    struct GraphEdge* next;
};




struct Halfedge 
{
    struct Halfedge *ELleft, *ELright;
    struct Edge *ELedge;
    int ELrefcnt;
    char ELpm;
    struct Site *vertex;
    double ystar;
    struct Halfedge *PQnext;
};




class VoronoiDiagramGenerator
{
public:
    VoronoiDiagramGenerator();
    ~VoronoiDiagramGenerator();

    bool generateVoronoi(double *xValues, double *yValues, int numPoints, double minX, double maxX, double minY, double maxY, double minDist=0);

    void resetIterator()
    {
        iteratorEdges = allEdges;
    }

    bool getNext(double& x1, double& y1, double& x2, double& y2)
    {
        if(iteratorEdges == 0)
            return false;
        
        x1 = iteratorEdges->x1;
        x2 = iteratorEdges->x2;
        y1 = iteratorEdges->y1;
        y2 = iteratorEdges->y2;

        iteratorEdges = iteratorEdges->next;

        return true;
    }

    void resetEdgeListIter()
    {
        iterEdgeList = allEdgeList;
    }

    bool getNextDelaunay(int& ep0, double& ep0x, double& ep0y, 
                         int& ep1, double& ep1x, double& ep1y,
                         int& reg0, int& reg1);

    void getNumbers(int& edges, int& vertices) {
        edges = nedges;
        vertices = nvertices;
    }

private:
    void cleanup();
    void cleanupEdgeList();
    void cleanupEdges();
    char *getfree(struct Freelist *fl);    
    struct Halfedge *PQfind();
    int PQempty();

    
    struct Halfedge **ELhash;
    struct Halfedge *HEcreate(), *ELleft(), *ELright(), *ELleftbnd();
    struct Halfedge *HEcreate(struct Edge *e,int pm);


    struct Point PQ_min();
    struct Halfedge *PQextractmin();    
    void freeinit(struct Freelist *fl,int size);
    void makefree(struct Freenode *curr,struct Freelist *fl);
    void geominit();
    void plotinit();
    bool voronoi(int triangulate);
    void ref(struct Site *v);
    void deref(struct Site *v);
    void endpoint(struct Edge *e,int lr,struct Site * s);

    void ELdelete(struct Halfedge *he);
    struct Halfedge *ELleftbnd(struct Point *p);
    struct Halfedge *ELright(struct Halfedge *he);
    void makevertex(struct Site *v);
    void out_triple(struct Site *s1, struct Site *s2,struct Site * s3);

    void PQinsert(struct Halfedge *he,struct Site * v, double offset);
    void PQdelete(struct Halfedge *he);
    bool ELinitialize();
    void ELinsert(struct Halfedge *lb, struct Halfedge *newHe);
    struct Halfedge *ELgethash(int b);
    struct Halfedge *ELleft(struct Halfedge *he);
    struct Site *leftreg(struct Halfedge *he);
    void out_site(struct Site *s);
    bool PQinitialize();
    int PQbucket(struct Halfedge *he);
    void clip_line(struct Edge *e);
    char *myalloc(unsigned n);
    int right_of(struct Halfedge *el,struct Point *p);

    struct Site *rightreg(struct Halfedge *he);
    struct Edge *bisect(struct Site *s1, struct Site *s2);
    double dist(struct Site *s,struct Site *t);
    struct Site *intersect(struct Halfedge *el1, struct Halfedge *el2, struct Point *p=0);

    void out_bisector(struct Edge *e);
    void out_ep(struct Edge *e);
    void out_vertex(struct Site *v);
    struct Site *nextone();

    void pushGraphEdge(double x1, double y1, double x2, double y2);
    void pushEdgeList(Edge *e);

    void openpl();
    void line(double x1, double y1, double x2, double y2);
    void circle(double x, double y, double radius);
    void range(double minX, double minY, double maxX, double maxY);


    struct Freelist hfl;
    struct Halfedge *ELleftend, *ELrightend;
    int ELhashsize;

    int triangulate, sorted, plot, debug;
    double xmin, xmax, ymin, ymax, deltax, deltay;

    struct Site *sites;
    int nsites;
    int siteidx;
    int sqrt_nsites;
    int nvertices;
    struct Freelist sfl;
    struct Site *bottomsite;

    int nedges;
    struct Freelist efl;
    int PQhashsize;
    struct Halfedge *PQhash;
    int PQcount;
    int PQmin;

    int ntry, totalsearch;
    double pxmin, pxmax, pymin, pymax, cradius;
    int total_alloc;

    double borderMinX, borderMaxX, borderMinY, borderMaxY;

    FreeNodeArrayList* allMemoryList;
    FreeNodeArrayList* currentMemoryBlock;

    GraphEdge* allEdges;
    GraphEdge* iteratorEdges;

    EdgeList* allEdgeList;
    EdgeList* iterEdgeList;

    double minDistanceBetweenSites;
    
};

int scomp(const void *p1, const void *p2);


#endif



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