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/* Copyright (c) 1996 Regents of the University of California */ |
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|
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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#endif |
| 6 |
|
| 7 |
/* |
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* genprism.c - generate a prism. |
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* 2D vertices in the xy plane are given on the |
| 10 |
* 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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|
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#include <stdio.h> |
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|
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#include <math.h> |
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|
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#include <ctype.h> |
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|
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#define MAXVERT 1024 /* maximum # vertices */ |
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|
| 23 |
#define FTINY 1e-6 |
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|
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#ifdef DCL_ATOF |
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extern double atof(); |
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#endif |
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|
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char *pmtype; /* material type */ |
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char *pname; /* name */ |
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|
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double lvect[3] = {0.0, 0.0, 1.0}; |
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double llen = 1.0; |
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|
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double vert[MAXVERT][2]; |
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int nverts = 0; |
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|
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double u[MAXVERT][2]; /* edge unit vectors */ |
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double a[MAXVERT]; /* corner trim sizes */ |
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|
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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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double crad = 0.0; /* radius for corners */ |
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|
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#define rounding (crad > FTINY) |
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|
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|
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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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int an; |
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|
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if (argc < 4) |
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goto userr; |
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|
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pmtype = argv[1]; |
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pname = argv[2]; |
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|
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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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|
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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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llen = sqrt(lvect[0]*lvect[0] + lvect[1]*lvect[1] + |
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lvect[2]*lvect[2]); |
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if (llen <= FTINY) { |
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fprintf(stderr, "%s: zero extrusion vector\n", |
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argv[0]); |
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exit(1); |
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} |
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break; |
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case 'r': /* radius */ |
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crad = 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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if (rounding) { |
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if (crad > fabs(lvect[2])) { |
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fprintf(stderr, "%s: rounding greater than height\n", |
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argv[0]); |
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exit(1); |
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} |
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compute_rounding(); |
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} |
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printhead(argc, argv); |
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|
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if (do_ends) |
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if (rounding) |
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printrends(); |
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else |
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printends(); |
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|
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printsides(rounding); |
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|
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exit(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][-r radius][-c][-e]\n"); |
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exit(1); |
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} |
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|
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|
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readverts(fname) /* read vertices from a file */ |
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char *fname; |
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{ |
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FILE *fp; |
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|
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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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|
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|
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compute_rounding() /* compute vectors for rounding operations */ |
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{ |
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register int i; |
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register double *v0, *v1; |
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double l; |
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|
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v0 = vert[nverts-1]; |
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for (i = 0; i < nverts; i++) { /* compute u[*] */ |
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v1 = vert[i]; |
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u[i][0] = v0[0] - v1[0]; |
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u[i][1] = v0[1] - v1[1]; |
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l = sqrt(u[i][0]*u[i][0] + u[i][1]*u[i][1]); |
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if (l <= FTINY) { |
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fprintf(stderr, "Degenerate side in prism\n"); |
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exit(1); |
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} |
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u[i][0] /= l; |
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u[i][1] /= l; |
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v0 = v1; |
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} |
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v1 = u[0]; |
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for (i = nverts; i--; ) { /* compute a[*] */ |
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v0 = u[i]; |
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l = v0[0]*v1[0] + v0[1]*v1[1]; |
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if (1+l <= FTINY) { |
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fprintf(stderr, "Overlapping sides in prism\n"); |
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exit(1); |
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} |
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if (1-l <= 0.) |
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a[i] = 0.; |
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else { |
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a[i] = sqrt((1-l)/(1+l)); |
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if ((v1[0]*v0[1]-v1[1]*v0[0] > 0.) != (lvect[2] > 0.)) |
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a[i] = -a[i]; |
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} |
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v1 = v0; |
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} |
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} |
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|
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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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/* bottom face */ |
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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", vert[i][0], |
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vert[i][1], 0.0); |
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/* top face */ |
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printf("\n%s polygon %s.t\n", pmtype, pname); |
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printf("0\n0\n%d\n", nverts*3); |
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for (i = nverts; i--; ) |
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printf("\t%18.12g\t%18.12g\t%18.12g\n", vert[i][0]+lvect[0], |
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vert[i][1]+lvect[1], lvect[2]); |
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} |
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|
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|
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printrends() /* print ends of prism with rounding */ |
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{ |
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register int i; |
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double c0[3], c1[3], cl[3]; |
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/* bottom face */ |
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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] + crad*(a[i]*u[i][0] - u[i][1]), |
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vert[i][1] + crad*(a[i]*u[i][1] + u[i][0]), |
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0.0); |
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} |
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/* bottom corners and edges */ |
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c0[0] = cl[0] = vert[nverts-1][0] + |
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crad*(a[nverts-1]*u[nverts-1][0] - u[nverts-1][1]); |
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c0[1] = cl[1] = vert[nverts-1][1] + |
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crad*(a[nverts-1]*u[nverts-1][1] + u[nverts-1][0]); |
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c0[2] = cl[2] = crad; |
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for (i = 0; i < nverts; i++) { |
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if (i < nverts-1) { |
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c1[0] = vert[i][0] + crad*(a[i]*u[i][0] - u[i][1]); |
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c1[1] = vert[i][1] + crad*(a[i]*u[i][1] + u[i][0]); |
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c1[2] = crad; |
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} else { |
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c1[0] = cl[0]; c1[1] = cl[1]; c1[2] = cl[2]; |
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} |
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if (a[i] > 0.) { |
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printf("\n%s sphere %s.bc%d\n", pmtype, pname, i+1); |
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printf("0\n0\n4 %18.12g %18.12g %18.12g %18.12g\n", |
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c1[0], c1[1], c1[2], crad); |
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} |
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printf("\n%s cylinder %s.be%d\n", pmtype, pname, i+1); |
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printf("0\n0\n7\n"); |
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printf("\t%18.12g\t%18.12g\t%18.12g\n", c0[0], c0[1], c0[2]); |
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printf("\t%18.12g\t%18.12g\t%18.12g\n", c1[0], c1[1], c1[2]); |
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printf("\t%18.12g\n", crad); |
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c0[0] = c1[0]; c0[1] = c1[1]; c0[2] = c1[2]; |
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} |
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/* top face */ |
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printf("\n%s polygon %s.t\n", pmtype, pname); |
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printf("0\n0\n%d\n", nverts*3); |
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for (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] + lvect[0] + crad*(a[i]*u[i][0] - u[i][1]), |
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vert[i][1] + lvect[1] + crad*(a[i]*u[i][1] + u[i][0]), |
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lvect[2]); |
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} |
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/* top corners and edges */ |
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c0[0] = cl[0] = vert[nverts-1][0] + lvect[0] + |
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crad*(a[nverts-1]*u[nverts-1][0] - u[nverts-1][1]); |
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c0[1] = cl[1] = vert[nverts-1][1] + lvect[1] + |
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crad*(a[nverts-1]*u[nverts-1][1] + u[nverts-1][0]); |
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c0[2] = cl[2] = lvect[2] - crad; |
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for (i = 0; i < nverts; i++) { |
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if (i < nverts-1) { |
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c1[0] = vert[i][0] + lvect[0] + |
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crad*(a[i]*u[i][0] - u[i][1]); |
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c1[1] = vert[i][1] + lvect[1] + |
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crad*(a[i]*u[i][1] + u[i][0]); |
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c1[2] = lvect[2] - crad; |
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} else { |
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c1[0] = cl[0]; c1[1] = cl[1]; c1[2] = cl[2]; |
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} |
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if (a[i] > 0.) { |
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printf("\n%s sphere %s.tc%d\n", pmtype, pname, i+1); |
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printf("0\n0\n4 %18.12g %18.12g %18.12g %18.12g\n", |
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c1[0], c1[1], c1[2], crad); |
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} |
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printf("\n%s cylinder %s.te%d\n", pmtype, pname, i+1); |
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printf("0\n0\n7\n"); |
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printf("\t%18.12g\t%18.12g\t%18.12g\n", c0[0], c0[1], c0[2]); |
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printf("\t%18.12g\t%18.12g\t%18.12g\n", c1[0], c1[1], c1[2]); |
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printf("\t%18.12g\n", crad); |
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c0[0] = c1[0]; c0[1] = c1[1]; c0[2] = c1[2]; |
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} |
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} |
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|
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|
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printsides(round) /* print prism sides */ |
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int round; |
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{ |
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register int i; |
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|
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for (i = 0; i < nverts-1; i++) |
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if (round) |
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rside(i, i+1); |
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else |
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side(i, i+1); |
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if (!iscomplete) |
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if (round) |
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rside(nverts-1, 0); |
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else |
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side(nverts-1, 0); |
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} |
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|
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|
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side(n0, n1) /* print single side */ |
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register int n0, n1; |
| 311 |
{ |
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printf("\n%s polygon %s.%d\n", pmtype, pname, n0+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", vert[n0][0], |
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vert[n0][1], 0.0); |
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printf("\t%18.12g\t%18.12g\t%18.12g\n", vert[n0][0]+lvect[0], |
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vert[n0][1]+lvect[1], lvect[2]); |
| 318 |
printf("\t%18.12g\t%18.12g\t%18.12g\n", vert[n1][0]+lvect[0], |
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vert[n1][1]+lvect[1], lvect[2]); |
| 320 |
printf("\t%18.12g\t%18.12g\t%18.12g\n", vert[n1][0], |
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vert[n1][1], 0.0); |
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} |
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|
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|
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rside(n0, n1) /* print side with rounded edge */ |
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register int n0, n1; |
| 327 |
{ |
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double s, c, t[3]; |
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|
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/* compute tanget offset vector */ |
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s = (lvect[1]*u[n1][0] - lvect[0]*u[n1][1])/llen; |
| 332 |
if (s < -FTINY || s > FTINY) { |
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c = sqrt(1. - s*s); |
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t[0] = (c - 1.)*u[n1][1]; |
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t[1] = (1. - c)*u[n1][0]; |
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t[2] = s; |
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} else |
| 338 |
t[0] = t[1] = t[2] = 0.; |
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/* output side */ |
| 340 |
printf("\n%s polygon %s.%d\n", pmtype, pname, n0+1); |
| 341 |
printf("0\n0\n12\n"); |
| 342 |
printf("\t%18.12g\t%18.12g\t%18.12g\n", |
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vert[n0][0] + crad*(t[0] - a[n0]*u[n1][0]), |
| 344 |
vert[n0][1] + crad*(t[1] - a[n0]*u[n1][1]), |
| 345 |
crad*(t[2] + 1.)); |
| 346 |
printf("\t%18.12g\t%18.12g\t%18.12g\n", |
| 347 |
vert[n0][0] + lvect[0] + crad*(t[0] - a[n0]*u[n1][0]), |
| 348 |
vert[n0][1] + lvect[1] + crad*(t[1] - a[n0]*u[n1][1]), |
| 349 |
lvect[2] + crad*(t[2] - 1.)); |
| 350 |
printf("\t%18.12g\t%18.12g\t%18.12g\n", |
| 351 |
vert[n1][0] + lvect[0] + crad*(t[0] + a[n1]*u[n1][0]), |
| 352 |
vert[n1][1] + lvect[1] + crad*(t[1] + a[n1]*u[n1][1]), |
| 353 |
lvect[2] + crad*(t[2] - 1.)); |
| 354 |
printf("\t%18.12g\t%18.12g\t%18.12g\n", |
| 355 |
vert[n1][0] + crad*(t[0] + a[n1]*u[n1][0]), |
| 356 |
vert[n1][1] + crad*(t[1] + a[n1]*u[n1][1]), |
| 357 |
crad*(t[2] + 1.)); |
| 358 |
/* output joining edge */ |
| 359 |
if (a[n1] < 0.) |
| 360 |
return; |
| 361 |
printf("\n%s cylinder %s.e%d\n", pmtype, pname, n0+1); |
| 362 |
printf("0\n0\n7\n"); |
| 363 |
printf("\t%18.12g\t%18.12g\t%18.12g\n", |
| 364 |
vert[n1][0] + crad*(a[n1]*u[n1][0] - u[n1][1]), |
| 365 |
vert[n1][1] + crad*(a[n1]*u[n1][1] + u[n1][0]), |
| 366 |
crad); |
| 367 |
printf("\t%18.12g\t%18.12g\t%18.12g\n", |
| 368 |
vert[n1][0] + lvect[0] + crad*(a[n1]*u[n1][0] - u[n1][1]), |
| 369 |
vert[n1][1] + lvect[1] + crad*(a[n1]*u[n1][1] + u[n1][0]), |
| 370 |
lvect[2] - crad); |
| 371 |
printf("\t%18.12g\n", crad); |
| 372 |
} |
| 373 |
|
| 374 |
|
| 375 |
printhead(ac, av) /* print command header */ |
| 376 |
register int ac; |
| 377 |
register char **av; |
| 378 |
{ |
| 379 |
putchar('#'); |
| 380 |
while (ac--) { |
| 381 |
putchar(' '); |
| 382 |
fputs(*av++, stdout); |
| 383 |
} |
| 384 |
putchar('\n'); |
| 385 |
} |
