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greg |
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/* Copyright (c) 1991 Regents of the University of California */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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#endif |
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/* |
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* contour.c - program to make contour plots, mappings from 3 to |
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* 2 dimenstions. |
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* |
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* 8/22/86 |
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*/ |
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#include "stdio.h" |
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#include "ctype.h" |
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#define MAXPTS 2048 /* maximum number of input points */ |
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typedef float DATAPT[3]; |
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DATAPT xyz[MAXPTS]; /* the input data */ |
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int xyzsiz; |
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double zmin = 1e20; /* z minimum */ |
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double zmax = -1e20; /* z maximum */ |
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int minset = 0; /* user set minimum? */ |
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int maxset = 0; /* user set maximum? */ |
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int ncurves = 6; /* number of contours */ |
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main(argc, argv) |
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int argc; |
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char *argv[]; |
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{ |
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extern double atof(); |
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extern int xycmp(); |
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FILE *fp; |
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int i; |
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for (i = 1; i < argc && argv[i][0] == '-'; i++) |
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switch (argv[i][1]) { |
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case 'n': |
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ncurves = atoi(argv[++i]); |
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break; |
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case 'l': |
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zmin = atof(argv[++i]); |
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minset = 1; |
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break; |
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case 'u': |
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zmax = atof(argv[++i]); |
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maxset = 1; |
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break; |
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default: |
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fprintf(stderr, "%s: unknown option: %s\n", |
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argv[0], argv[i]); |
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exit(1); |
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} |
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if (i == argc) |
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getdata(stdin); |
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else if (i < argc-1) { |
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fprintf(stderr, "%s: too many file names\n", argv[0]); |
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exit(1); |
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} else if ((fp = fopen(argv[i], "r")) == NULL) { |
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fprintf(stderr, "%s: file not found\n", argv[i]); |
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exit(1); |
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} else |
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getdata(fp); |
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qsort(xyz, xyzsiz, sizeof(DATAPT), xycmp); /* sort data */ |
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for (i = 0; i < ncurves; i++) /* do contours */ |
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contour(i); |
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exit(0); |
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} |
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getdata(fp) /* read input data */ |
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FILE *fp; |
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{ |
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register int i; |
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while (xyzsiz < MAXPTS) { |
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for (i = 0; i < 3; i++) |
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if (fscanf(fp, "%f", &xyz[xyzsiz][i]) != 1) |
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break; |
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if (i != 3) |
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break; |
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if (xyz[xyzsiz][2] < zmin) |
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if (minset) |
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continue; |
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else |
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zmin = xyz[xyzsiz][2]; |
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if (xyz[xyzsiz][2] > zmax) |
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if (maxset) |
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continue; |
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else |
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zmax = xyz[xyzsiz][2]; |
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xyzsiz++; |
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} |
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if (!feof(fp)) { |
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fprintf(stderr, "Error reading input data\n"); |
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exit(1); |
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} |
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} |
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int |
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xycmp(p1, p2) /* -1 if p1 < p2, 0 if equal, 1 if p1 > p2 */ |
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DATAPT p1, p2; |
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{ |
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if (p1[0] > p2[0]) |
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return(1); |
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if (p1[0] < p2[0]) |
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return(-1); |
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if (p1[1] > p2[1]) |
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return(1); |
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if (p1[1] < p2[1]) |
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return(-1); |
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return(0); |
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} |
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contour(n) /* make contour n */ |
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int n; |
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{ |
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double z; |
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z = (n+.5)*(zmax-zmin)/ncurves + zmin; |
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printf("%clabel=\"%f\";\n", n+'A', z); |
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printf("%cdata=\n", n+'A'); |
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crossings(z); |
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printf(";\n"); |
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} |
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crossings(z) /* find crossings for z */ |
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double z; |
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{ |
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register DATAPT *p0, *p1; |
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p0 = p1 = xyz; |
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while (p0 < xyz+xyzsiz-2) { |
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while (p1 < xyz+xyzsiz-2) { |
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if (p0[0][0] < p1[0][0] && p0[0][1] <= p1[0][1]) |
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break; |
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p1++; |
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} |
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if (p0[0][0] == p0[1][0]) |
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cross(p0[0], p0[1], z); |
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if (p0[0][1] == p1[0][1]) |
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cross(p0[0], p1[0], z); |
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p0++; |
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} |
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} |
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cross(p0, p1, z) /* mark crossing between p0 and p1 */ |
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register DATAPT p0, p1; |
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double z; |
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{ |
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if (p1[2] - p0[2] == 0.0) |
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return; |
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z = (z - p0[2])/(p1[2] - p0[2]); |
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if (z < 0.0 || z >= 1.0) |
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return; |
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printf("%e\t", p0[0]*(1.0 - z) + p1[0]*z); |
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printf("%e\n", p0[1]*(1.0 - z) + p1[1]*z); |
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} |
