mirror of
https://github.com/osm-search/Nominatim.git
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282 lines
6.7 KiB
C++
282 lines
6.7 KiB
C++
/*
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* The author of this software is Steven Fortune. Copyright (c) 1994 by AT&T
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* Bell Laboratories.
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* Permission to use, copy, modify, and distribute this software for any
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* purpose without fee is hereby granted, provided that this entire notice
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* is included in all copies of any software which is or includes a copy
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* or modification of this software and in all copies of the supporting
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* documentation for such software.
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* THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTY. IN PARTICULAR, NEITHER THE AUTHORS NOR AT&T MAKE ANY
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* REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE MERCHANTABILITY
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* OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE.
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*/
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/*
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* This code was originally written by Stephan Fortune in C code. I, Shane O'Sullivan,
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* have since modified it, encapsulating it in a C++ class and, fixing memory leaks and
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* adding accessors to the Voronoi Edges.
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* Permission to use, copy, modify, and distribute this software for any
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* purpose without fee is hereby granted, provided that this entire notice
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* is included in all copies of any software which is or includes a copy
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* or modification of this software and in all copies of the supporting
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* documentation for such software.
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* THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTY. IN PARTICULAR, NEITHER THE AUTHORS NOR AT&T MAKE ANY
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* REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE MERCHANTABILITY
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* OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE.
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*/
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#ifndef VORONOI_DIAGRAM_GENERATOR
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#define VORONOI_DIAGRAM_GENERATOR
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#include <math.h>
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#include <stdlib.h>
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#include <string.h>
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#ifndef NULL
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#define NULL 0
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#endif
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#define DELETED -2
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#define le 0
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#define re 1
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struct SourcePoint
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{
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int id;
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double weight;
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double x;
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double y;
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};
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struct Freenode
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{
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struct Freenode *nextfree;
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};
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struct FreeNodeArrayList
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{
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struct Freenode* memory;
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struct FreeNodeArrayList* next;
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};
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struct Freelist
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{
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struct Freenode *head;
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int nodesize;
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};
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struct Point
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{
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float x,y;
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};
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struct PolygonPoint
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{
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struct Point coord;
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double angle;
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int boundary;
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};
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struct Polygon
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{
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int sitenbr;
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struct Point coord;
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int numpoints;
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struct PolygonPoint * pointlist;
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int boundary;
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};
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// structure used both for sites and for vertices
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struct Site
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{
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struct Point coord;
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struct Point coordout;
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double weight;
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int sitenbr;
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int refcnt;
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};
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struct Edge
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{
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float a,b,c;
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struct Site *ep[2];
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struct Site *reg[2];
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int edgenbr;
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};
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struct GraphEdge
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{
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float x1,y1,x2,y2;
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struct GraphEdge* next;
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};
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struct Halfedge
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{
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struct Halfedge *ELleft, *ELright;
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struct Edge *ELedge;
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int ELrefcnt;
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char ELpm;
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struct Site *vertex;
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float ystar;
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struct Halfedge *PQnext;
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};
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class VoronoiDiagramGenerator
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{
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public:
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VoronoiDiagramGenerator();
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~VoronoiDiagramGenerator();
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bool generateVoronoi(struct SourcePoint* srcPoints, int numPoints, float minX, float maxX, float minY, float maxY, float minDist=0);
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void getSitePoints(int sitenbr, int* numpoints, PolygonPoint** pS);
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void resetIterator()
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{
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iteratorEdges = allEdges;
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}
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bool getNext(float& x1, float& y1, float& x2, float& y2)
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{
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if(iteratorEdges == 0)
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return false;
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x1 = iteratorEdges->x1;
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x2 = iteratorEdges->x2;
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y1 = iteratorEdges->y1;
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y2 = iteratorEdges->y2;
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iteratorEdges = iteratorEdges->next;
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return true;
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}
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private:
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void cleanup();
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void cleanupEdges();
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char *getfree(struct Freelist *fl);
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struct Halfedge *PQfind();
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int PQempty();
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struct Halfedge **ELhash;
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struct Halfedge *HEcreate(), *ELleft(), *ELright(), *ELleftbnd();
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struct Halfedge *HEcreate(struct Edge *e,int pm);
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struct Point PQ_min();
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struct Halfedge *PQextractmin();
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void freeinit(struct Freelist *fl,int size);
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void makefree(struct Freenode *curr,struct Freelist *fl);
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void geominit();
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void plotinit();
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bool voronoi(int triangulate);
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void ref(struct Site *v);
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void deref(struct Site *v);
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void endpoint(struct Edge *e,int lr,struct Site * s);
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void endpoint(struct Edge *e1,int lr,struct Site * s, struct Edge *e2, struct Edge *e3);
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void ELdelete(struct Halfedge *he);
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struct Halfedge *ELleftbnd(struct Point *p);
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struct Halfedge *ELright(struct Halfedge *he);
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void makevertex(struct Site *v);
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void out_triple(struct Site *s1, struct Site *s2,struct Site * s3);
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void PQinsert(struct Halfedge *he,struct Site * v, float offset);
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void PQdelete(struct Halfedge *he);
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bool ELinitialize();
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void ELinsert(struct Halfedge *lb, struct Halfedge *newHe);
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struct Halfedge * ELgethash(int b);
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struct Halfedge *ELleft(struct Halfedge *he);
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struct Site *leftreg(struct Halfedge *he);
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void out_site(struct Site *s);
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bool PQinitialize();
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int PQbucket(struct Halfedge *he);
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void pushpoint(int sitenbr, double x, double y, int boundary);
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int ccw( Point p0, Point p1, Point p2 );
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void clip_line(struct Edge *e);
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char *myalloc(unsigned n);
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int right_of(struct Halfedge *el,struct Point *p);
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struct Site *rightreg(struct Halfedge *he);
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struct Edge *bisect(struct Site *s1,struct Site *s2);
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float dist(struct Site *s,struct Site *t);
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struct Site *intersect(struct Halfedge *el1, struct Halfedge *el2, struct Point *p=0);
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void out_bisector(struct Edge *e);
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void out_ep(struct Edge *e);
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void out_vertex(struct Site *v);
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struct Site *nextone();
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void pushGraphEdge(float x1, float y1, float x2, float y2);
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void openpl();
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void line(float x1, float y1, float x2, float y2);
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void circle(float x, float y, float radius);
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void range(float minX, float minY, float maxX, float maxY);
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struct Freelist hfl;
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struct Halfedge *ELleftend, *ELrightend;
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int ELhashsize;
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int triangulate, sorted, plot, debug;
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float xmin, xmax, ymin, ymax, deltax, deltay;
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struct Site *sites;
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struct Polygon *polygons;
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struct Point corners[4];
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int nsites;
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int siteidx;
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int sqrt_nsites;
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int nvertices;
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struct Freelist sfl;
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struct Site *bottomsite;
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int nedges;
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struct Freelist efl;
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int PQhashsize;
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struct Halfedge *PQhash;
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int PQcount;
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int PQmin;
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int ntry, totalsearch;
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float pxmin, pxmax, pymin, pymax, cradius;
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int total_alloc;
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float borderMinX, borderMaxX, borderMinY, borderMaxY;
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FreeNodeArrayList* allMemoryList;
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FreeNodeArrayList* currentMemoryBlock;
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GraphEdge* allEdges;
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GraphEdge* iteratorEdges;
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float minDistanceBetweenSites;
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};
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int scomp(const void *p1,const void *p2);
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int spcomp(const void *p1,const void *p2);
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int anglecomp(const void * p1, const void * p2);
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#endif
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