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greg |
1.1 |
/* Copyright (c) 1987 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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* genprism.c - generate a prism.
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* 2D vertices in the xy plane are given on the
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* command line or from a file. Their order together
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* with the extrude direction will determine surface
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* orientation.
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*
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* 8/24/87
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*/
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#include <stdio.h>
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#include <ctype.h>
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#define MAXVERT 1024 /* maximum # vertices */
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char *pmtype; /* material type */
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char *pname; /* name */
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double lvect[3] = {0.0, 0.0, 1.0};
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double vert[MAXVERT][2];
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int nverts = 0;
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int do_ends = 1; /* include end caps */
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int iscomplete = 0; /* polygon is already completed */
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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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double atof();
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int an;
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if (argc < 4)
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goto userr;
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pmtype = argv[1];
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pname = argv[2];
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if (!strcmp(argv[3], "-")) {
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readverts(NULL);
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an = 4;
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} else if (isdigit(argv[3][0])) {
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nverts = atoi(argv[3]);
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if (argc-3 < 2*nverts)
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goto userr;
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for (an = 0; an < nverts; an++) {
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vert[an][0] = atof(argv[2*an+4]);
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vert[an][1] = atof(argv[2*an+5]);
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}
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an = 2*nverts+4;
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} else {
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readverts(argv[3]);
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an = 4;
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}
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if (nverts < 3) {
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fprintf(stderr, "%s: not enough vertices\n", argv[0]);
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exit(1);
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}
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for ( ; an < argc; an++) {
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if (argv[an][0] != '-')
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goto userr;
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switch (argv[an][1]) {
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case 'l': /* length vector */
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lvect[0] = atof(argv[++an]);
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lvect[1] = atof(argv[++an]);
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lvect[2] = atof(argv[++an]);
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break;
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case 'e': /* ends */
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do_ends = !do_ends;
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break;
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case 'c': /* complete */
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iscomplete = !iscomplete;
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break;
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default:
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goto userr;
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}
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}
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printhead(argc, argv);
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if (do_ends)
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printends();
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printsides();
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return(0);
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userr:
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fprintf(stderr, "Usage: %s material name ", argv[0]);
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fprintf(stderr, "{ - | vfile | N v1 v2 .. vN } ");
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fprintf(stderr, "[-l lvect][-c][-e]\n");
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exit(1);
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}
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readverts(fname) /* read vertices from a file */
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greg |
1.2 |
char *fname;
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greg |
1.1 |
{
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FILE *fp;
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if (fname == NULL)
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fp = stdin;
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else if ((fp = fopen(fname, "r")) == NULL) {
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fprintf(stderr, "%s: cannot open\n", fname);
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exit(1);
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}
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while (fscanf(fp, "%lf %lf", &vert[nverts][0], &vert[nverts][1]) == 2)
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nverts++;
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fclose(fp);
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}
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printends() /* print ends of prism */
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{
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register int i;
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printf("\n%s polygon %s.b\n", pmtype, pname);
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printf("0\n0\n%d\n", nverts*3);
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for (i = 0; i < nverts; i++) {
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printf("\t%18.12g\t%18.12g\t%18.12g\n",
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vert[i][0],
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vert[i][1],
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0.0);
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}
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printf("\n%s polygon %s.e\n", pmtype, pname);
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printf("0\n0\n%d\n", nverts*3);
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for (i = nverts-1; i >= 0; i--) {
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printf("\t%18.12g\t%18.12g\t%18.12g\n",
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vert[i][0]+lvect[0],
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vert[i][1]+lvect[1],
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lvect[2]);
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}
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}
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printsides() /* print prism sides */
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{
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register int i;
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for (i = 0; i < nverts-1; i++)
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side(i, i+1);
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if (!iscomplete)
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side(nverts-1, 0);
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}
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side(n1, n2) /* print single side */
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register int n1, n2;
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{
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printf("\n%s polygon %s.%d\n", pmtype, pname, n1+1);
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printf("0\n0\n12\n");
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printf("\t%18.12g\t%18.12g\t%18.12g\n",
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vert[n1][0],
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vert[n1][1],
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0.0);
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printf("\t%18.12g\t%18.12g\t%18.12g\n",
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vert[n1][0]+lvect[0],
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vert[n1][1]+lvect[1],
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lvect[2]);
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printf("\t%18.12g\t%18.12g\t%18.12g\n",
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vert[n2][0]+lvect[0],
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vert[n2][1]+lvect[1],
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lvect[2]);
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printf("\t%18.12g\t%18.12g\t%18.12g\n",
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vert[n2][0],
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vert[n2][1],
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0.0);
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}
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printhead(ac, av) /* print command header */
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register int ac;
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register char **av;
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{
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putchar('#');
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while (ac--) {
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putchar(' ');
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fputs(*av++, stdout);
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}
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putchar('\n');
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}
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