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/* Copyright (c) 1989 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 |
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|
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/* |
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* genworm.c - program to generate worms (strings with varying thickness). |
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* |
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* The program takes as input the functions of t for x, y, |
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* z and r (the radius). Cylinders and cones will be |
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* joined by spheres. Negative radii are forbidden. |
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* |
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* 9/24/87 |
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*/ |
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|
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#include <stdio.h> |
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|
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#include "fvect.h" |
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|
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#define XNAME "X_" /* x function name */ |
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#define YNAME "Y_" /* y function name */ |
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#define ZNAME "Z_" /* z function name */ |
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#define RNAME "R_" /* r function name */ |
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|
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#define PI 3.14159265358979323846 |
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|
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#define FTINY 1e-7 |
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|
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#define max(a,b) ((a) > (b) ? (a) : (b)) |
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|
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|
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double funvalue(), l_hermite(), l_bezier(), argument(); |
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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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char stmp[256]; |
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double t, f, lastr, r; |
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FVECT lastp, p; |
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int i, nseg; |
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|
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varset("PI", PI, NULL); |
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funset("hermite", 5, l_hermite); |
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funset("bezier", 5, l_bezier); |
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|
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if (argc < 8) |
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goto userror; |
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|
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for (i = 8; i < argc; i++) |
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if (!strcmp(argv[i], "-e")) |
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scompile(NULL, argv[++i]); |
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else if (!strcmp(argv[i], "-f")) |
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fcompile(argv[++i]); |
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else |
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goto userror; |
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|
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sprintf(stmp, "%s(t)=%s;", XNAME, argv[3]); |
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scompile(NULL, stmp); |
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sprintf(stmp, "%s(t)=%s;", YNAME, argv[4]); |
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scompile(NULL, stmp); |
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sprintf(stmp, "%s(t)=%s;", ZNAME, argv[5]); |
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scompile(NULL, stmp); |
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sprintf(stmp, "%s(t)=%s;", RNAME, argv[6]); |
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scompile(NULL, stmp); |
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nseg = atoi(argv[7]); |
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if (nseg <= 0) |
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goto userror; |
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|
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printhead(argc, argv); |
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|
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for (i = 0; i <= nseg; i++) { |
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t = (double)i/nseg; |
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p[0] = funvalue(XNAME, 1, &t); |
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p[1] = funvalue(YNAME, 1, &t); |
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p[2] = funvalue(ZNAME, 1, &t); |
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r = funvalue(RNAME, 1, &t); |
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if (i) |
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if (lastr <= r+FTINY && lastr >= r-FTINY) { |
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printf("\n%s cylinder %s.c%d\n", |
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argv[1], argv[2], i); |
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printf("0\n0\n7\n"); |
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printf("%18.12g %18.12g %18.12g\n", |
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lastp[0], lastp[1], lastp[2]); |
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printf("%18.12g %18.12g %18.12g\n", |
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p[0], p[1], p[2]); |
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printf("%18.12g\n", r); |
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} else { |
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printf("\n%s cone %s.c%d\n", |
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argv[1], argv[2], i); |
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printf("0\n0\n8\n"); |
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f = (lastr - r)/dist2(lastp,p); |
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printf("%18.12g %18.12g %18.12g\n", |
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lastp[0] + f*lastr*(p[0] - lastp[0]), |
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lastp[1] + f*lastr*(p[1] - lastp[1]), |
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lastp[2] + f*lastr*(p[2] - lastp[2])); |
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printf("%18.12g %18.12g %18.12g\n", |
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p[0] + f*r*(p[0] - lastp[0]), |
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p[1] + f*r*(p[1] - lastp[1]), |
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p[2] + f*r*(p[2] - lastp[2])); |
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f = 1.0 - (lastr-r)*f; |
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f = f <= 0.0 ? 0.0 : sqrt(f); |
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printf("%18.12g %18.12g\n", f*lastr, f*r); |
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} |
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printf("\n%s sphere %s.s%d\n", argv[1], argv[2], i); |
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printf("0\n0\n4 %18.12g %18.12g %18.12g %18.12g\n", |
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p[0], p[1], p[2], r); |
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VCOPY(lastp, p); |
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lastr = r; |
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} |
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quit(0); |
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|
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userror: |
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fprintf(stderr, |
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"Usage: %s material name x(t) y(t) z(t) r(t) nseg [-e expr] [-f file]\n", |
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argv[0]); |
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quit(1); |
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} |
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|
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|
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eputs(msg) |
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char *msg; |
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{ |
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fputs(msg, stderr); |
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} |
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|
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|
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wputs(msg) |
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char *msg; |
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{ |
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eputs(msg); |
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} |
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|
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|
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quit(code) |
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{ |
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exit(code); |
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} |
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|
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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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|
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|
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double |
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l_hermite() |
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{ |
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double t; |
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|
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t = argument(5); |
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return( argument(1)*((2.0*t-3.0)*t*t+1.0) + |
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argument(2)*(-2.0*t+3.0)*t*t + |
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argument(3)*((t-2.0)*t+1.0)*t + |
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argument(4)*(t-1.0)*t*t ); |
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} |
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|
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|
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double |
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l_bezier() |
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{ |
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double t; |
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|
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t = argument(5); |
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return( argument(1) * (1.+t*(-3.+t*(3.-t))) + |
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argument(2) * 3.*t*(1.+t*(-2.+t)) + |
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argument(3) * 3.*t*t*(1.-t) + |
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argument(4) * t*t*t ); |
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} |
