1 |
greg |
1.1 |
#ifndef lint |
2 |
greg |
2.6 |
static const char RCSid[] = "$Id: genworm.c,v 2.5 2003/07/21 22:30:18 schorsch Exp $"; |
3 |
greg |
1.1 |
#endif |
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greg |
1.2 |
/* |
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greg |
1.1 |
* genworm.c - program to generate worms (strings with varying thickness). |
6 |
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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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#include <stdio.h> |
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greg |
2.2 |
#include <math.h> |
16 |
greg |
2.6 |
#include "calcomp.h" |
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greg |
1.1 |
#include "fvect.h" |
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19 |
greg |
1.9 |
#define XNAME "X`SYS`" /* x function name */ |
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#define YNAME "Y`SYS`" /* y function name */ |
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#define ZNAME "Z`SYS`" /* z function name */ |
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#define RNAME "R`SYS`" /* r function name */ |
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greg |
1.1 |
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24 |
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#define PI 3.14159265358979323846 |
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#define max(a,b) ((a) > (b) ? (a) : (b)) |
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29 |
greg |
2.6 |
double l_hermite(char *), l_bezier(char *), l_bspline(char *); |
30 |
greg |
2.4 |
void quit(); |
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greg |
1.1 |
|
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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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42 |
greg |
1.7 |
varset("PI", ':', PI); |
43 |
greg |
1.8 |
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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greg |
1.1 |
|
47 |
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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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greg |
1.6 |
scompile(argv[++i], NULL, 0); |
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greg |
1.1 |
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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greg |
1.6 |
scompile(stmp, NULL, 0); |
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greg |
1.1 |
sprintf(stmp, "%s(t)=%s;", YNAME, argv[4]); |
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greg |
1.6 |
scompile(stmp, NULL, 0); |
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greg |
1.1 |
sprintf(stmp, "%s(t)=%s;", ZNAME, argv[5]); |
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greg |
1.6 |
scompile(stmp, NULL, 0); |
64 |
greg |
1.1 |
sprintf(stmp, "%s(t)=%s;", RNAME, argv[6]); |
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greg |
1.6 |
scompile(stmp, NULL, 0); |
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greg |
1.1 |
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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greg |
1.5 |
eclock = 0; |
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greg |
1.1 |
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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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schorsch |
2.5 |
if (i) { |
80 |
greg |
1.1 |
if (lastr <= r+FTINY && lastr >= r-FTINY) { |
81 |
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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 { |
90 |
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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])); |
98 |
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printf("%18.12g %18.12g %18.12g\n", |
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p[0] + f*r*(p[0] - lastp[0]), |
100 |
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p[1] + f*r*(p[1] - lastp[1]), |
101 |
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p[2] + f*r*(p[2] - lastp[2])); |
102 |
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f = 1.0 - (lastr-r)*f; |
103 |
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f = f <= 0.0 ? 0.0 : sqrt(f); |
104 |
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printf("%18.12g %18.12g\n", f*lastr, f*r); |
105 |
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} |
106 |
schorsch |
2.5 |
} |
107 |
greg |
1.1 |
printf("\n%s sphere %s.s%d\n", argv[1], argv[2], i); |
108 |
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printf("0\n0\n4 %18.12g %18.12g %18.12g %18.12g\n", |
109 |
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p[0], p[1], p[2], r); |
110 |
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VCOPY(lastp, p); |
111 |
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lastr = r; |
112 |
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} |
113 |
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quit(0); |
114 |
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115 |
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userror: |
116 |
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fprintf(stderr, |
117 |
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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]); |
119 |
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quit(1); |
120 |
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} |
121 |
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122 |
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123 |
greg |
2.4 |
void |
124 |
greg |
1.1 |
eputs(msg) |
125 |
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char *msg; |
126 |
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{ |
127 |
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fputs(msg, stderr); |
128 |
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} |
129 |
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130 |
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131 |
greg |
2.4 |
void |
132 |
greg |
1.1 |
wputs(msg) |
133 |
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char *msg; |
134 |
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{ |
135 |
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eputs(msg); |
136 |
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} |
137 |
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138 |
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139 |
greg |
2.4 |
void |
140 |
greg |
1.1 |
quit(code) |
141 |
greg |
2.3 |
int code; |
142 |
greg |
1.1 |
{ |
143 |
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exit(code); |
144 |
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} |
145 |
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146 |
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147 |
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printhead(ac, av) /* print command header */ |
148 |
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register int ac; |
149 |
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register char **av; |
150 |
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{ |
151 |
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putchar('#'); |
152 |
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while (ac--) { |
153 |
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putchar(' '); |
154 |
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fputs(*av++, stdout); |
155 |
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} |
156 |
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putchar('\n'); |
157 |
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} |
158 |
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159 |
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160 |
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double |
161 |
greg |
2.6 |
l_hermite(char *nm) |
162 |
greg |
1.1 |
{ |
163 |
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double t; |
164 |
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165 |
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t = argument(5); |
166 |
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return( argument(1)*((2.0*t-3.0)*t*t+1.0) + |
167 |
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argument(2)*(-2.0*t+3.0)*t*t + |
168 |
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argument(3)*((t-2.0)*t+1.0)*t + |
169 |
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argument(4)*(t-1.0)*t*t ); |
170 |
greg |
1.3 |
} |
171 |
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172 |
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173 |
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double |
174 |
greg |
2.6 |
l_bezier(char *nm) |
175 |
greg |
1.3 |
{ |
176 |
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double t; |
177 |
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178 |
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t = argument(5); |
179 |
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return( argument(1) * (1.+t*(-3.+t*(3.-t))) + |
180 |
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argument(2) * 3.*t*(1.+t*(-2.+t)) + |
181 |
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argument(3) * 3.*t*t*(1.-t) + |
182 |
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argument(4) * t*t*t ); |
183 |
greg |
1.4 |
} |
184 |
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185 |
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186 |
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double |
187 |
greg |
2.6 |
l_bspline(char *nm) |
188 |
greg |
1.4 |
{ |
189 |
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double t; |
190 |
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191 |
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t = argument(5); |
192 |
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return( argument(1) * (1./6.+t*(-1./2.+t*(1./2.-1./6.*t))) + |
193 |
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argument(2) * (2./3.+t*t*(-1.+1./2.*t)) + |
194 |
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argument(3) * (1./6.+t*(1./2.+t*(1./2.-1./2.*t))) + |
195 |
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argument(4) * (1./6.*t*t*t) ); |
196 |
greg |
1.1 |
} |