| 1 |
#ifndef lint |
| 2 |
static const char RCSid[] = "$Id$"; |
| 3 |
#endif |
| 4 |
/* |
| 5 |
* genprism.c - generate a prism. |
| 6 |
* 2D vertices in the xy plane are given on the |
| 7 |
* command line or from a file. Their order together |
| 8 |
* with the extrude direction will determine surface |
| 9 |
* orientation. |
| 10 |
*/ |
| 11 |
|
| 12 |
#include <stdio.h> |
| 13 |
|
| 14 |
#include <stdlib.h> |
| 15 |
|
| 16 |
#include <math.h> |
| 17 |
|
| 18 |
#include <ctype.h> |
| 19 |
|
| 20 |
#define MAXVERT 1024 /* maximum # vertices */ |
| 21 |
|
| 22 |
#define FTINY 1e-6 |
| 23 |
|
| 24 |
char *pmtype; /* material type */ |
| 25 |
char *pname; /* name */ |
| 26 |
|
| 27 |
double lvect[3] = {0.0, 0.0, 1.0}; |
| 28 |
int lvdir = 1; |
| 29 |
double llen = 1.0; |
| 30 |
|
| 31 |
double vert[MAXVERT][2]; |
| 32 |
int nverts = 0; |
| 33 |
|
| 34 |
double u[MAXVERT][2]; /* edge unit vectors */ |
| 35 |
double a[MAXVERT]; /* corner trim sizes */ |
| 36 |
|
| 37 |
int do_ends = 1; /* include end caps */ |
| 38 |
int iscomplete = 0; /* polygon is already completed */ |
| 39 |
double crad = 0.0; /* radius for corners (sign from lvdir) */ |
| 40 |
|
| 41 |
extern double compute_rounding(); |
| 42 |
|
| 43 |
|
| 44 |
main(argc, argv) |
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int argc; |
| 46 |
char **argv; |
| 47 |
{ |
| 48 |
int an; |
| 49 |
|
| 50 |
if (argc < 4) |
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goto userr; |
| 52 |
|
| 53 |
pmtype = argv[1]; |
| 54 |
pname = argv[2]; |
| 55 |
|
| 56 |
if (!strcmp(argv[3], "-")) { |
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readverts(NULL); |
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an = 4; |
| 59 |
} else if (isdigit(argv[3][0])) { |
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nverts = atoi(argv[3]); |
| 61 |
if (argc-3 < 2*nverts) |
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goto userr; |
| 63 |
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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if (lvect[2] < -FTINY) |
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lvdir = -1; |
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else if (lvect[2] > FTINY) |
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lvdir = 1; |
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else { |
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fprintf(stderr, |
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"%s: illegal extrusion vector\n", |
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argv[0]); |
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exit(1); |
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} |
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llen = sqrt(lvect[0]*lvect[0] + lvect[1]*lvect[1] + |
| 96 |
lvect[2]*lvect[2]); |
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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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} |
| 111 |
if (crad > FTINY) { |
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if (crad > lvdir*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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crad *= lvdir; /* simplifies formulas */ |
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compute_rounding(); |
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printhead(argc, argv); |
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if (do_ends) |
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printrends(); |
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printsides(1); |
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} else { |
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printhead(argc, argv); |
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if (do_ends) |
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printends(); |
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printsides(0); |
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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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double |
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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, asum; |
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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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asum = 0.; |
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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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asum += l = v1[0]*v0[1]-v1[1]*v0[0]; |
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if (l < 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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return(asum*.5); |
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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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/* 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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/* 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 (lvdir*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], lvdir*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", lvdir*crad); |
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c0[0] = c1[0]; c0[1] = c1[1]; c0[2] = c1[2]; |
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} |
| 265 |
/* top corners and edges */ |
| 266 |
c0[0] = cl[0] = vert[nverts-1][0] + lvect[0] + |
| 267 |
crad*(a[nverts-1]*u[nverts-1][0] - u[nverts-1][1]); |
| 268 |
c0[1] = cl[1] = vert[nverts-1][1] + lvect[1] + |
| 269 |
crad*(a[nverts-1]*u[nverts-1][1] + u[nverts-1][0]); |
| 270 |
c0[2] = cl[2] = lvect[2] - crad; |
| 271 |
for (i = 0; i < nverts; i++) { |
| 272 |
if (i < nverts-1) { |
| 273 |
c1[0] = vert[i][0] + lvect[0] + |
| 274 |
crad*(a[i]*u[i][0] - u[i][1]); |
| 275 |
c1[1] = vert[i][1] + lvect[1] + |
| 276 |
crad*(a[i]*u[i][1] + u[i][0]); |
| 277 |
c1[2] = lvect[2] - crad; |
| 278 |
} else { |
| 279 |
c1[0] = cl[0]; c1[1] = cl[1]; c1[2] = cl[2]; |
| 280 |
} |
| 281 |
if (lvdir*a[i] > 0.) { |
| 282 |
printf("\n%s sphere %s.tc%d\n", pmtype, pname, i+1); |
| 283 |
printf("0\n0\n4 %18.12g %18.12g %18.12g %18.12g\n", |
| 284 |
c1[0], c1[1], c1[2], lvdir*crad); |
| 285 |
} |
| 286 |
printf("\n%s cylinder %s.te%d\n", pmtype, pname, i+1); |
| 287 |
printf("0\n0\n7\n"); |
| 288 |
printf("\t%18.12g\t%18.12g\t%18.12g\n", c0[0], c0[1], c0[2]); |
| 289 |
printf("\t%18.12g\t%18.12g\t%18.12g\n", c1[0], c1[1], c1[2]); |
| 290 |
printf("\t%18.12g\n", lvdir*crad); |
| 291 |
c0[0] = c1[0]; c0[1] = c1[1]; c0[2] = c1[2]; |
| 292 |
} |
| 293 |
} |
| 294 |
|
| 295 |
|
| 296 |
printsides(round) /* print prism sides */ |
| 297 |
int round; |
| 298 |
{ |
| 299 |
register int i; |
| 300 |
|
| 301 |
for (i = 0; i < nverts-1; i++) |
| 302 |
if (round) |
| 303 |
rside(i, i+1); |
| 304 |
else |
| 305 |
side(i, i+1); |
| 306 |
if (!iscomplete) |
| 307 |
if (round) |
| 308 |
rside(nverts-1, 0); |
| 309 |
else |
| 310 |
side(nverts-1, 0); |
| 311 |
} |
| 312 |
|
| 313 |
|
| 314 |
side(n0, n1) /* print single side */ |
| 315 |
register int n0, n1; |
| 316 |
{ |
| 317 |
printf("\n%s polygon %s.%d\n", pmtype, pname, n0+1); |
| 318 |
printf("0\n0\n12\n"); |
| 319 |
printf("\t%18.12g\t%18.12g\t%18.12g\n", vert[n0][0], |
| 320 |
vert[n0][1], 0.0); |
| 321 |
printf("\t%18.12g\t%18.12g\t%18.12g\n", vert[n0][0]+lvect[0], |
| 322 |
vert[n0][1]+lvect[1], lvect[2]); |
| 323 |
printf("\t%18.12g\t%18.12g\t%18.12g\n", vert[n1][0]+lvect[0], |
| 324 |
vert[n1][1]+lvect[1], lvect[2]); |
| 325 |
printf("\t%18.12g\t%18.12g\t%18.12g\n", vert[n1][0], |
| 326 |
vert[n1][1], 0.0); |
| 327 |
} |
| 328 |
|
| 329 |
|
| 330 |
rside(n0, n1) /* print side with rounded edge */ |
| 331 |
register int n0, n1; |
| 332 |
{ |
| 333 |
double s, c, t[3]; |
| 334 |
|
| 335 |
/* compute tanget offset vector */ |
| 336 |
s = lvdir*(lvect[1]*u[n1][0] - lvect[0]*u[n1][1])/llen; |
| 337 |
if (s < -FTINY || s > FTINY) { |
| 338 |
c = sqrt(1. - s*s); |
| 339 |
t[0] = (c - 1.)*u[n1][1]; |
| 340 |
t[1] = (1. - c)*u[n1][0]; |
| 341 |
t[2] = s; |
| 342 |
} else |
| 343 |
t[0] = t[1] = t[2] = 0.; |
| 344 |
/* output side */ |
| 345 |
printf("\n%s polygon %s.%d\n", pmtype, pname, n0+1); |
| 346 |
printf("0\n0\n12\n"); |
| 347 |
printf("\t%18.12g\t%18.12g\t%18.12g\n", |
| 348 |
vert[n0][0] + crad*(t[0] - a[n0]*u[n1][0]), |
| 349 |
vert[n0][1] + crad*(t[1] - a[n0]*u[n1][1]), |
| 350 |
crad*(t[2] + 1.)); |
| 351 |
printf("\t%18.12g\t%18.12g\t%18.12g\n", |
| 352 |
vert[n0][0] + lvect[0] + crad*(t[0] - a[n0]*u[n1][0]), |
| 353 |
vert[n0][1] + lvect[1] + crad*(t[1] - a[n0]*u[n1][1]), |
| 354 |
lvect[2] + crad*(t[2] - 1.)); |
| 355 |
printf("\t%18.12g\t%18.12g\t%18.12g\n", |
| 356 |
vert[n1][0] + lvect[0] + crad*(t[0] + a[n1]*u[n1][0]), |
| 357 |
vert[n1][1] + lvect[1] + crad*(t[1] + a[n1]*u[n1][1]), |
| 358 |
lvect[2] + crad*(t[2] - 1.)); |
| 359 |
printf("\t%18.12g\t%18.12g\t%18.12g\n", |
| 360 |
vert[n1][0] + crad*(t[0] + a[n1]*u[n1][0]), |
| 361 |
vert[n1][1] + crad*(t[1] + a[n1]*u[n1][1]), |
| 362 |
crad*(t[2] + 1.)); |
| 363 |
/* output joining edge */ |
| 364 |
if (lvdir*a[n1] < 0.) |
| 365 |
return; |
| 366 |
printf("\n%s cylinder %s.e%d\n", pmtype, pname, n0+1); |
| 367 |
printf("0\n0\n7\n"); |
| 368 |
printf("\t%18.12g\t%18.12g\t%18.12g\n", |
| 369 |
vert[n1][0] + crad*(a[n1]*u[n1][0] - u[n1][1]), |
| 370 |
vert[n1][1] + crad*(a[n1]*u[n1][1] + u[n1][0]), |
| 371 |
crad); |
| 372 |
printf("\t%18.12g\t%18.12g\t%18.12g\n", |
| 373 |
vert[n1][0] + lvect[0] + crad*(a[n1]*u[n1][0] - u[n1][1]), |
| 374 |
vert[n1][1] + lvect[1] + crad*(a[n1]*u[n1][1] + u[n1][0]), |
| 375 |
lvect[2] - crad); |
| 376 |
printf("\t%18.12g\n", lvdir*crad); |
| 377 |
} |
| 378 |
|
| 379 |
|
| 380 |
printhead(ac, av) /* print command header */ |
| 381 |
register int ac; |
| 382 |
register char **av; |
| 383 |
{ |
| 384 |
putchar('#'); |
| 385 |
while (ac--) { |
| 386 |
putchar(' '); |
| 387 |
fputs(*av++, stdout); |
| 388 |
} |
| 389 |
putchar('\n'); |
| 390 |
} |
