128 lines
4.4 KiB
C
128 lines
4.4 KiB
C
/* voronoi.c
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*
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* Created by Rory Healy (healyr@student.unimelb.edu.au)
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* Created on 12th August 2021
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* Last modified 13th September 2021
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*
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* Contains functions involving the generation of the Voronoi diagram, and
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* running each stage of the assignment.
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*
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*/
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#ifndef VORONOI_HEADER
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#include "voronoi.h"
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#endif
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void stage1PrintBisector(bisector_t *bisector, FILE *outputFile) {
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if (bisector->isSlopeInfinite) {
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/* Cannot print infinite slope, so print only x-intercept */
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fprintf(outputFile, "x = %lf\n", bisector->mid->x);
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} else {
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fprintf(outputFile, "y = %lf * (x - %lf) + %lf\n", \
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bisector->slope, bisector->mid->x, bisector->mid->y);
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}
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}
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void stage2PrintIntersection(intersection_t *intersection, FILE *outputFile) {
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fprintf(outputFile, "From Edge %d (%lf, %lf) to Edge %d (%lf, %lf)\n", \
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intersection->fromEdge, intersection->fromPoint->x, \
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intersection->fromPoint->y, intersection->toEdge, \
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intersection->toPoint->x, intersection->toPoint->y);
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}
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void stage1(char *pointsFileName, char *outputFileName) {
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FILE *pointsFile = NULL, *outputFile = NULL;
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pointsFile = safeFileOpen(&pointsFile, pointsFileName, "r");
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outputFile = safeFileOpen(&outputFile, outputFileName, "w");
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/* Points are given as pairs, so initialise 2 points */
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vertex_t **points = malloc(sizeof(*points) * 2);
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checkNullPointer(points);
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int numPoints = 0;
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points = readPoints(points, pointsFile, &numPoints);
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/* There are half as many bisectors as points */
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int numBisectors = numPoints / 2;
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bisector_t **bisectors = malloc(sizeof(*bisectors) * numBisectors);
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checkNullPointer(bisectors);
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bisectors = getBisectors(bisectors, points, numBisectors);
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/* For each pair, calculate and print the bisector to outputFile */
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for (int i = 0; i < numBisectors; i++) {
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stage1PrintBisector(bisectors[i], outputFile);
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}
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/* Clean up */
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freePoints(points, numPoints);
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freeBisectors(bisectors, numBisectors);
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fclose(pointsFile);
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fclose(outputFile);
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}
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void stage2(char *pointsFileName, char *polygonFileName, char *outputFileName) {
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FILE *pointsFile = NULL, *outputFile = NULL;
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pointsFile = safeFileOpen(&pointsFile, pointsFileName, "r");
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outputFile = safeFileOpen(&outputFile, outputFileName, "w");
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/* Points are given as pairs, so initialise 2 points */
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vertex_t **points = malloc(sizeof(*points) * 2);
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checkNullPointer(points);
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int numPoints = 0;
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points = readPoints(points, pointsFile, &numPoints);
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/* There are half as many bisectors as points */
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int numBisectors = numPoints / 2;
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bisector_t **bisectors = malloc(sizeof(*bisectors) * numBisectors);
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checkNullPointer(bisectors);
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bisectors = getBisectors(bisectors, points, numBisectors);
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/* Construct the DCEL from the polygon file */
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DCEL_t *dcel = readPolygonFile(polygonFileName);
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/* Calculate and print intersections to the output file */
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intersection_t **intersections = malloc(sizeof(*intersections));
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checkNullPointer(intersections);
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int numIntersections = 0;
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intersections = getIntersections(intersections, &numIntersections, bisectors, numBisectors, dcel, DEFAULT_FACE, \
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DEFAULTMINLENGTH);
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for (int i = 0; i < numIntersections; i++) {
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stage2PrintIntersection(intersections[i], outputFile);
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}
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/* Clean up */
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freePoints(points, numPoints);
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freeBisectors(bisectors, numBisectors);
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freeIntersections(intersections, numIntersections);
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freeDCEL(dcel);
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fclose(pointsFile);
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fclose(outputFile);
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}
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void stage3(char *dataFileName, char *polygonFileName, char *outputFileName) {
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FILE *dataFile = NULL, *polygonFile = NULL, *outputFile = NULL;
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dataFile = safeFileOpen(&dataFile, dataFileName, "r");
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polygonFile = safeFileOpen(&polygonFile, polygonFileName, "r");
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outputFile = safeFileOpen(&outputFile, outputFileName, "w");
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/* Clean up */
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fclose(dataFile);
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fclose(polygonFile);
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fclose(outputFile);
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}
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void stage4(char *dataFileName, char *polygonFileName, char *outputFileName) {
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FILE *dataFile = NULL, *polygonFile = NULL, *outputFile = NULL;
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dataFile = safeFileOpen(&dataFile, dataFileName, "r");
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polygonFile = safeFileOpen(&polygonFile, polygonFileName, "r");
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outputFile = safeFileOpen(&outputFile, outputFileName, "w");
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/* Clean up */
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fclose(dataFile);
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fclose(polygonFile);
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fclose(outputFile);
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}
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