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greg |
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/* RCSid $Id: triangulate.h,v 2.2 2014/01/24 01:26:44 greg Exp $ */ |
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greg |
2.1 |
/* |
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* triangulate.h |
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* |
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* Adapted by Greg Ward on 1/23/14. |
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* Copyright 2014 Anyhere Software. All rights reserved. |
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* |
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*/ |
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/* COTD Entry submitted by John W. Ratcliff [[email protected]] */ |
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/**** THIS IS A CODE SNIPPET WHICH WILL EFFICIEINTLY TRIANGULATE ANY |
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// ** POLYGON/CONTOUR (without holes) AS A STATIC CLASS. THIS SNIPPET |
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// ** IS COMPRISED OF 3 FILES, TRIANGULATE.H, THE HEADER FILE FOR THE |
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// ** TRIANGULATE BASE CLASS, TRIANGULATE.CPP, THE IMPLEMENTATION OF |
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// ** THE TRIANGULATE BASE CLASS, AND TEST.CPP, A SMALL TEST PROGRAM |
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// ** DEMONSTRATING THE USAGE OF THE TRIANGULATOR. THE TRIANGULATE |
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// ** BASE CLASS ALSO PROVIDES TWO USEFUL HELPER METHODS, ONE WHICH |
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// ** COMPUTES THE AREA OF A POLYGON, AND ANOTHER WHICH DOES AN EFFICENT |
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// ** POINT IN A TRIANGLE TEST. |
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// ** SUBMITTED BY JOHN W. RATCLIFF ([email protected]) July 22, 2000 |
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*/ |
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/**********************************************************************/ |
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/************ HEADER FILE FOR TRIANGULATE.C ***************************/ |
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/**********************************************************************/ |
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#ifndef TRIANGULATE_H |
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#define TRIANGULATE_H |
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#ifdef __cplusplus |
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extern "C" { |
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#endif |
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typedef struct { |
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double mX, mY; |
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} Vert2; |
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typedef struct { |
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int nv; /* number of vertices */ |
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void *p; /* client data pointer */ |
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Vert2 v[3]; /* extends struct */ |
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} Vert2_list; |
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/* allocate a polygon list */ |
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extern Vert2_list *polyAlloc(int nv); |
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#define polyFree free |
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/* callback for output triangle */ |
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greg |
2.2 |
typedef int tri_out_t(const Vert2_list *tp, int a, int b, int c); |
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greg |
2.1 |
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greg |
2.3 |
/* triangulate a polygon, send results to the given callback function */ |
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greg |
2.1 |
extern int polyTriangulate(const Vert2_list *contour, tri_out_t *cb); |
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/* compute area of a contour/polygon */ |
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extern double polyArea(const Vert2_list *contour); |
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greg |
2.3 |
/* decide if point P is inside triangle defined by ABC */ |
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greg |
2.1 |
extern int insideTriangle(double Ax, double Ay, |
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double Bx, double By, |
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double Cx, double Cy, |
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double Px, double Py); |
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#ifdef __cplusplus |
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} |
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#endif |
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#endif |
