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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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/* Copyright (c) 1989 Regents of the University of California */ |
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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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#define max(a,b) ((a) > (b) ? (a) : (b)) |
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double funvalue(), l_hermite(), argument(); |
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double funvalue(), l_hermite(), l_bezier(), l_bspline(), argument(); |
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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 long eclock; |
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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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varset("PI", ':', PI); |
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funset("hermite", 5, l_hermite); |
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funset("bezier", 5, l_bezier); |
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funset("bspline", 5, l_bspline); |
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|
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if (argc < 8) |
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goto userror; |
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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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scompile(argv[++i], NULL, 0); |
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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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sprintf(stmp, "%s(t)=%s;", XNAME, argv[3]); |
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scompile(NULL, stmp); |
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scompile(stmp, NULL, 0); |
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sprintf(stmp, "%s(t)=%s;", YNAME, argv[4]); |
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scompile(NULL, stmp); |
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scompile(stmp, NULL, 0); |
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sprintf(stmp, "%s(t)=%s;", ZNAME, argv[5]); |
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scompile(NULL, stmp); |
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scompile(stmp, NULL, 0); |
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sprintf(stmp, "%s(t)=%s;", RNAME, argv[6]); |
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scompile(NULL, stmp); |
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scompile(stmp, NULL, 0); |
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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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printhead(argc, argv); |
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eclock = 0; |
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for (i = 0; i <= nseg; i++) { |
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t = (double)i/nseg; |
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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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} |
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|
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|
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double |
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l_bspline() |
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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./6.+t*(-1./2.+t*(1./2.-1./6.*t))) + |
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argument(2) * (2./3.+t*t*(-1.+1./2.*t)) + |
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argument(3) * (1./6.+t*(1./2.+t*(1./2.-1./2.*t))) + |
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argument(4) * (1./6.*t*t*t) ); |
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} |
