280 lines
10 KiB
C
280 lines
10 KiB
C
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/*****************************************************************************/
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/* */
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/* (tricall.c) */
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/* */
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/* Example program that demonstrates how to call Triangle. */
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/* */
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/* Accompanies Triangle Version 1.3 */
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/* July 19, 1996 */
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/* */
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/* This file is placed in the public domain (but the file that it calls */
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/* is still copyrighted!) by */
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/* Jonathan Richard Shewchuk */
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/* School of Computer Science */
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/* Carnegie Mellon University */
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/* 5000 Forbes Avenue */
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/* Pittsburgh, Pennsylvania 15213-3891 */
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/* jrs@cs.cmu.edu */
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/* */
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/*****************************************************************************/
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/* If SINGLE is defined when triangle.o is compiled, it should also be */
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/* defined here. If not, it should not be defined here. */
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/* #define SINGLE */
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#ifdef SINGLE
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#define REAL float
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#else /* not SINGLE */
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#define REAL double
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#endif /* not SINGLE */
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#include <stdio.h>
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#include "triangle.h"
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#ifndef _STDLIB_H_
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extern void *malloc();
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extern void free();
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#endif /* _STDLIB_H_ */
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/*****************************************************************************/
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/* */
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/* report() Print the input or output. */
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/* */
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/*****************************************************************************/
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void report(io, markers, reporttriangles, reportneighbors, reportsegments,
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reportedges, reportnorms)
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struct triangulateio *io;
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int markers;
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int reporttriangles;
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int reportneighbors;
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int reportsegments;
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int reportedges;
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int reportnorms;
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{
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int i, j;
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for (i = 0; i < io->numberofpoints; i++) {
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printf("Point %4d:", i);
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for (j = 0; j < 2; j++) {
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printf(" %.6g", io->pointlist[i * 2 + j]);
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}
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if (io->numberofpointattributes > 0) {
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printf(" attributes");
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}
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for (j = 0; j < io->numberofpointattributes; j++) {
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printf(" %.6g",
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io->pointattributelist[i * io->numberofpointattributes + j]);
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}
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if (markers) {
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printf(" marker %d\n", io->pointmarkerlist[i]);
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} else {
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printf("\n");
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}
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}
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printf("\n");
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if (reporttriangles || reportneighbors) {
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for (i = 0; i < io->numberoftriangles; i++) {
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if (reporttriangles) {
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printf("Triangle %4d points:", i);
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for (j = 0; j < io->numberofcorners; j++) {
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printf(" %4d", io->trianglelist[i * io->numberofcorners + j]);
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}
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if (io->numberoftriangleattributes > 0) {
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printf(" attributes");
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}
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for (j = 0; j < io->numberoftriangleattributes; j++) {
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printf(" %.6g", io->triangleattributelist[i *
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io->numberoftriangleattributes + j]);
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}
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printf("\n");
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}
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if (reportneighbors) {
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printf("Triangle %4d neighbors:", i);
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for (j = 0; j < 3; j++) {
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printf(" %4d", io->neighborlist[i * 3 + j]);
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}
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printf("\n");
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}
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}
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printf("\n");
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}
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if (reportsegments) {
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for (i = 0; i < io->numberofsegments; i++) {
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printf("Segment %4d points:", i);
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for (j = 0; j < 2; j++) {
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printf(" %4d", io->segmentlist[i * 2 + j]);
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}
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if (markers) {
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printf(" marker %d\n", io->segmentmarkerlist[i]);
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} else {
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printf("\n");
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}
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}
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printf("\n");
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}
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if (reportedges) {
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for (i = 0; i < io->numberofedges; i++) {
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printf("Edge %4d points:", i);
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for (j = 0; j < 2; j++) {
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printf(" %4d", io->edgelist[i * 2 + j]);
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}
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if (reportnorms && (io->edgelist[i * 2 + 1] == -1)) {
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for (j = 0; j < 2; j++) {
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printf(" %.6g", io->normlist[i * 2 + j]);
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}
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}
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if (markers) {
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printf(" marker %d\n", io->edgemarkerlist[i]);
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} else {
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printf("\n");
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}
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}
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printf("\n");
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}
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}
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/*****************************************************************************/
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/* */
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/* main() Create and refine a mesh. */
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/* */
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/*****************************************************************************/
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int main()
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{
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struct triangulateio in, mid, out, vorout;
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/* Define input points. */
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in.numberofpoints = 4;
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in.numberofpointattributes = 1;
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in.pointlist = (REAL *) malloc(in.numberofpoints * 2 * sizeof(REAL));
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in.pointlist[0] = 0.0;
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in.pointlist[1] = 0.0;
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in.pointlist[2] = 1.0;
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in.pointlist[3] = 0.0;
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in.pointlist[4] = 1.0;
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in.pointlist[5] = 10.0;
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in.pointlist[6] = 0.0;
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in.pointlist[7] = 10.0;
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in.pointattributelist = (REAL *) malloc(in.numberofpoints *
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in.numberofpointattributes *
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sizeof(REAL));
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in.pointattributelist[0] = 0.0;
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in.pointattributelist[1] = 1.0;
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in.pointattributelist[2] = 11.0;
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in.pointattributelist[3] = 10.0;
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in.pointmarkerlist = (int *) malloc(in.numberofpoints * sizeof(int));
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in.pointmarkerlist[0] = 0;
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in.pointmarkerlist[1] = 2;
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in.pointmarkerlist[2] = 0;
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in.pointmarkerlist[3] = 0;
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in.numberofsegments = 0;
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in.numberofholes = 0;
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in.numberofregions = 1;
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in.regionlist = (REAL *) malloc(in.numberofregions * 4 * sizeof(REAL));
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in.regionlist[0] = 0.5;
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in.regionlist[1] = 5.0;
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in.regionlist[2] = 7.0; /* Regional attribute (for whole mesh). */
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in.regionlist[3] = 0.1; /* Area constraint that will not be used. */
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printf("Input point set:\n\n");
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report(&in, 1, 0, 0, 0, 0, 0);
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/* Make necessary initializations so that Triangle can return a */
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/* triangulation in `mid' and a voronoi diagram in `vorout'. */
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mid.pointlist = (REAL *) NULL; /* Not needed if -N switch used. */
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/* Not needed if -N switch used or number of point attributes is zero: */
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mid.pointattributelist = (REAL *) NULL;
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mid.pointmarkerlist = (int *) NULL; /* Not needed if -N or -B switch used. */
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mid.trianglelist = (int *) NULL; /* Not needed if -E switch used. */
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/* Not needed if -E switch used or number of triangle attributes is zero: */
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mid.triangleattributelist = (REAL *) NULL;
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mid.neighborlist = (int *) NULL; /* Needed only if -n switch used. */
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/* Needed only if segments are output (-p or -c) and -P not used: */
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mid.segmentlist = (int *) NULL;
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/* Needed only if segments are output (-p or -c) and -P and -B not used: */
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mid.segmentmarkerlist = (int *) NULL;
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mid.edgelist = (int *) NULL; /* Needed only if -e switch used. */
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mid.edgemarkerlist = (int *) NULL; /* Needed if -e used and -B not used. */
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vorout.pointlist = (REAL *) NULL; /* Needed only if -v switch used. */
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/* Needed only if -v switch used and number of attributes is not zero: */
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vorout.pointattributelist = (REAL *) NULL;
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vorout.edgelist = (int *) NULL; /* Needed only if -v switch used. */
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vorout.normlist = (REAL *) NULL; /* Needed only if -v switch used. */
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/* Triangulate the points. Switches are chosen to read and write a */
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/* PSLG (p), preserve the convex hull (c), number everything from */
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/* zero (z), assign a regional attribute to each element (A), and */
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/* produce an edge list (e), a Voronoi diagram (v), and a triangle */
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/* neighbor list (n). */
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triangulate("pczAevn", &in, &mid, &vorout);
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printf("Initial triangulation:\n\n");
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report(&mid, 1, 1, 1, 1, 1, 0);
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printf("Initial Voronoi diagram:\n\n");
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report(&vorout, 0, 0, 0, 0, 1, 1);
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/* Attach area constraints to the triangles in preparation for */
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/* refining the triangulation. */
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/* Needed only if -r and -a switches used: */
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mid.trianglearealist = (REAL *) malloc(mid.numberoftriangles * sizeof(REAL));
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mid.trianglearealist[0] = 3.0;
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mid.trianglearealist[1] = 1.0;
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/* Make necessary initializations so that Triangle can return a */
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/* triangulation in `out'. */
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out.pointlist = (REAL *) NULL; /* Not needed if -N switch used. */
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/* Not needed if -N switch used or number of attributes is zero: */
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out.pointattributelist = (REAL *) NULL;
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out.trianglelist = (int *) NULL; /* Not needed if -E switch used. */
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/* Not needed if -E switch used or number of triangle attributes is zero: */
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out.triangleattributelist = (REAL *) NULL;
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/* Refine the triangulation according to the attached */
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/* triangle area constraints. */
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triangulate("prazBP", &mid, &out, (struct triangulateio *) NULL);
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printf("Refined triangulation:\n\n");
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report(&out, 0, 1, 0, 0, 0, 0);
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/* Free all allocated arrays, including those allocated by Triangle. */
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free(in.pointlist);
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free(in.pointattributelist);
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free(in.pointmarkerlist);
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free(in.regionlist);
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free(mid.pointlist);
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free(mid.pointattributelist);
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free(mid.pointmarkerlist);
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free(mid.trianglelist);
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free(mid.triangleattributelist);
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free(mid.trianglearealist);
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free(mid.neighborlist);
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free(mid.segmentlist);
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free(mid.segmentmarkerlist);
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free(mid.edgelist);
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free(mid.edgemarkerlist);
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free(vorout.pointlist);
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free(vorout.pointattributelist);
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free(vorout.edgelist);
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free(vorout.normlist);
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free(out.pointlist);
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free(out.pointattributelist);
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free(out.trianglelist);
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free(out.triangleattributelist);
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return 0;
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}
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