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/* Copyright (c) 1989 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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/* Copyright (c) 1989 Regents of the University of California */ |
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/* |
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* gensurf.c - program to generate functional surfaces |
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* |
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char *modname, *surfname; |
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double funvalue(), l_hermite(), l_bezier(), argument(); |
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double funvalue(), l_hermite(), l_bezier(), l_bspline(), argument(); |
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typedef struct { |
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FVECT p; /* vertex position */ |
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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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POINT *row0, *row1, *row2, *rp; |
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int i, j, m, n; |
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char stmp[256]; |
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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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if (argc < 8) |
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goto userror; |
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row0++; row1++; row2++; |
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/* print header */ |
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printhead(argc, argv); |
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eclock = 0; |
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/* initialize */ |
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comprow(-1.0/m, row0, n); |
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comprow(0.0, row1, n); |
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int siz; |
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{ |
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double st[2]; |
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int end; |
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register int i; |
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/* compute one past each end */ |
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if (smooth) { |
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i = -1; /* compute one past each end */ |
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end = siz+1; |
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} else { |
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if (s < -FTINY || s > 1.0+FTINY) |
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return; |
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i = 0; |
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end = siz; |
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} |
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st[0] = s; |
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for (i = -1; i <= siz+1; i++) { |
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while (i <= end) { |
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st[1] = (double)i/siz; |
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row[i].p[0] = funvalue(XNAME, 2, st); |
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row[i].p[1] = funvalue(YNAME, 2, st); |
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row[i].p[2] = funvalue(ZNAME, 2, st); |
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i++; |
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} |
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} |
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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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double |
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l_bspline() |
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{ |
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double t; |
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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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} |