| 1 |
#ifndef lint |
| 2 |
static const char RCSid[] = "$Id: genworm.c,v 2.13 2024/12/10 17:22:39 greg Exp $"; |
| 3 |
#endif |
| 4 |
/* |
| 5 |
* genworm.c - program to generate worms (strings with varying thickness). |
| 6 |
* |
| 7 |
* The program takes as input the functions of t for x, y, |
| 8 |
* z and r (the radius). Cylinders and cones will be |
| 9 |
* joined by spheres. Negative radii are forbidden. |
| 10 |
* |
| 11 |
* 9/24/87 |
| 12 |
*/ |
| 13 |
|
| 14 |
#include <stdlib.h> |
| 15 |
#include <math.h> |
| 16 |
|
| 17 |
#include "calcomp.h" |
| 18 |
#include "rtio.h" |
| 19 |
#include "resolu.h" |
| 20 |
#include "rterror.h" |
| 21 |
#include "fvect.h" |
| 22 |
|
| 23 |
#define XNAME "X`SYS`" /* x function name */ |
| 24 |
#define YNAME "Y`SYS`" /* y function name */ |
| 25 |
#define ZNAME "Z`SYS`" /* z function name */ |
| 26 |
#define RNAME "R`SYS`" /* r function name */ |
| 27 |
|
| 28 |
#define PI 3.14159265358979323846 |
| 29 |
|
| 30 |
#define max(a,b) ((a) > (b) ? (a) : (b)) |
| 31 |
|
| 32 |
|
| 33 |
/* XXX redundant, move to library */ |
| 34 |
double l_hermite(char *), l_bezier(char *), l_bspline(char *); |
| 35 |
|
| 36 |
|
| 37 |
int |
| 38 |
main(argc, argv) |
| 39 |
int argc; |
| 40 |
char *argv[]; |
| 41 |
{ |
| 42 |
char stmp[256]; |
| 43 |
double t, f, lastr = 0, r; |
| 44 |
FVECT lastp, p; |
| 45 |
int i, nseg; |
| 46 |
|
| 47 |
esupport |= E_VARIABLE|E_FUNCTION|E_RCONST; |
| 48 |
esupport &= ~(E_OUTCHAN|E_INCHAN); |
| 49 |
varset("PI", ':', PI); |
| 50 |
funset("hermite", 5, ':', l_hermite); |
| 51 |
funset("bezier", 5, ':', l_bezier); |
| 52 |
funset("bspline", 5, ':', l_bspline); |
| 53 |
|
| 54 |
if (argc < 8) |
| 55 |
goto userror; |
| 56 |
|
| 57 |
for (i = 8; i < argc; i++) |
| 58 |
if (!strcmp(argv[i], "-e")) |
| 59 |
scompile(argv[++i], NULL, 0); |
| 60 |
else if (!strcmp(argv[i], "-f")) { |
| 61 |
char *fpath = getpath(argv[++i], getrlibpath(), 0); |
| 62 |
if (fpath == NULL) { |
| 63 |
fprintf(stderr, "%s: cannot find file '%s'\n", |
| 64 |
argv[0], argv[i]); |
| 65 |
quit(1); |
| 66 |
} |
| 67 |
fcompile(fpath); |
| 68 |
} else |
| 69 |
goto userror; |
| 70 |
|
| 71 |
sprintf(stmp, "%s(t)=%s;", XNAME, argv[3]); |
| 72 |
scompile(stmp, NULL, 0); |
| 73 |
sprintf(stmp, "%s(t)=%s;", YNAME, argv[4]); |
| 74 |
scompile(stmp, NULL, 0); |
| 75 |
sprintf(stmp, "%s(t)=%s;", ZNAME, argv[5]); |
| 76 |
scompile(stmp, NULL, 0); |
| 77 |
sprintf(stmp, "%s(t)=%s;", RNAME, argv[6]); |
| 78 |
scompile(stmp, NULL, 0); |
| 79 |
nseg = eval(argv[7]) + .5; |
| 80 |
if (nseg <= 0) |
| 81 |
goto userror; |
| 82 |
|
| 83 |
fputs("# ", stdout); |
| 84 |
printargs(argc, argv, stdout); |
| 85 |
doptimize(1); |
| 86 |
eclock++; |
| 87 |
|
| 88 |
for (i = 0; i <= nseg; i++) { |
| 89 |
t = (double)i/nseg; |
| 90 |
p[0] = funvalue(XNAME, 1, &t); |
| 91 |
p[1] = funvalue(YNAME, 1, &t); |
| 92 |
p[2] = funvalue(ZNAME, 1, &t); |
| 93 |
r = funvalue(RNAME, 1, &t); |
| 94 |
if (i) { |
| 95 |
if (lastr <= r+FTINY && lastr >= r-FTINY) { |
| 96 |
printf("\n%s cylinder %s.c%d\n", |
| 97 |
argv[1], argv[2], i); |
| 98 |
printf("0\n0\n7\n"); |
| 99 |
printf("%18.12g %18.12g %18.12g\n", |
| 100 |
lastp[0], lastp[1], lastp[2]); |
| 101 |
printf("%18.12g %18.12g %18.12g\n", |
| 102 |
p[0], p[1], p[2]); |
| 103 |
printf("%18.12g\n", r); |
| 104 |
} else { |
| 105 |
printf("\n%s cone %s.c%d\n", |
| 106 |
argv[1], argv[2], i); |
| 107 |
printf("0\n0\n8\n"); |
| 108 |
f = (lastr - r)/dist2(lastp,p); |
| 109 |
printf("%18.12g %18.12g %18.12g\n", |
| 110 |
lastp[0] + f*lastr*(p[0] - lastp[0]), |
| 111 |
lastp[1] + f*lastr*(p[1] - lastp[1]), |
| 112 |
lastp[2] + f*lastr*(p[2] - lastp[2])); |
| 113 |
printf("%18.12g %18.12g %18.12g\n", |
| 114 |
p[0] + f*r*(p[0] - lastp[0]), |
| 115 |
p[1] + f*r*(p[1] - lastp[1]), |
| 116 |
p[2] + f*r*(p[2] - lastp[2])); |
| 117 |
f = 1.0 - (lastr-r)*f; |
| 118 |
f = f <= 0.0 ? 0.0 : sqrt(f); |
| 119 |
printf("%18.12g %18.12g\n", f*lastr, f*r); |
| 120 |
} |
| 121 |
} |
| 122 |
printf("\n%s sphere %s.s%d\n", argv[1], argv[2], i); |
| 123 |
printf("0\n0\n4 %18.12g %18.12g %18.12g %18.12g\n", |
| 124 |
p[0], p[1], p[2], r); |
| 125 |
VCOPY(lastp, p); |
| 126 |
lastr = r; |
| 127 |
} |
| 128 |
return 0; |
| 129 |
|
| 130 |
userror: |
| 131 |
fprintf(stderr, |
| 132 |
"Usage: %s material name x(t) y(t) z(t) r(t) nseg [-e expr] [-f file]\n", |
| 133 |
argv[0]); |
| 134 |
return 1; |
| 135 |
} |
| 136 |
|
| 137 |
|
| 138 |
double |
| 139 |
l_hermite(char *nm) |
| 140 |
{ |
| 141 |
double t; |
| 142 |
|
| 143 |
t = argument(5); |
| 144 |
return( argument(1)*((2.0*t-3.0)*t*t+1.0) + |
| 145 |
argument(2)*(-2.0*t+3.0)*t*t + |
| 146 |
argument(3)*((t-2.0)*t+1.0)*t + |
| 147 |
argument(4)*(t-1.0)*t*t ); |
| 148 |
} |
| 149 |
|
| 150 |
|
| 151 |
double |
| 152 |
l_bezier(char *nm) |
| 153 |
{ |
| 154 |
double t; |
| 155 |
|
| 156 |
t = argument(5); |
| 157 |
return( argument(1) * (1.+t*(-3.+t*(3.-t))) + |
| 158 |
argument(2) * 3.*t*(1.+t*(-2.+t)) + |
| 159 |
argument(3) * 3.*t*t*(1.-t) + |
| 160 |
argument(4) * t*t*t ); |
| 161 |
} |
| 162 |
|
| 163 |
|
| 164 |
double |
| 165 |
l_bspline(char *nm) |
| 166 |
{ |
| 167 |
double t; |
| 168 |
|
| 169 |
t = argument(5); |
| 170 |
return( argument(1) * (1./6.+t*(-1./2.+t*(1./2.-1./6.*t))) + |
| 171 |
argument(2) * (2./3.+t*t*(-1.+1./2.*t)) + |
| 172 |
argument(3) * (1./6.+t*(1./2.+t*(1./2.-1./2.*t))) + |
| 173 |
argument(4) * (1./6.*t*t*t) ); |
| 174 |
} |
