1 |
#ifndef lint |
2 |
static char SCCSid[] = "$SunId$ LBL"; |
3 |
#endif |
4 |
|
5 |
/* Copyright (c) 1989 Regents of the University of California */ |
6 |
|
7 |
/* |
8 |
* genworm.c - program to generate worms (strings with varying thickness). |
9 |
* |
10 |
* The program takes as input the functions of t for x, y, |
11 |
* z and r (the radius). Cylinders and cones will be |
12 |
* joined by spheres. Negative radii are forbidden. |
13 |
* |
14 |
* 9/24/87 |
15 |
*/ |
16 |
|
17 |
#include <stdio.h> |
18 |
#include <math.h> |
19 |
#include "fvect.h" |
20 |
|
21 |
#define XNAME "X`SYS`" /* x function name */ |
22 |
#define YNAME "Y`SYS`" /* y function name */ |
23 |
#define ZNAME "Z`SYS`" /* z function name */ |
24 |
#define RNAME "R`SYS`" /* r function name */ |
25 |
|
26 |
#define PI 3.14159265358979323846 |
27 |
|
28 |
#define max(a,b) ((a) > (b) ? (a) : (b)) |
29 |
|
30 |
|
31 |
double funvalue(), l_hermite(), l_bezier(), l_bspline(), argument(); |
32 |
|
33 |
|
34 |
main(argc, argv) |
35 |
int argc; |
36 |
char *argv[]; |
37 |
{ |
38 |
extern long eclock; |
39 |
char stmp[256]; |
40 |
double t, f, lastr, r; |
41 |
FVECT lastp, p; |
42 |
int i, nseg; |
43 |
|
44 |
varset("PI", ':', PI); |
45 |
funset("hermite", 5, ':', l_hermite); |
46 |
funset("bezier", 5, ':', l_bezier); |
47 |
funset("bspline", 5, ':', l_bspline); |
48 |
|
49 |
if (argc < 8) |
50 |
goto userror; |
51 |
|
52 |
for (i = 8; i < argc; i++) |
53 |
if (!strcmp(argv[i], "-e")) |
54 |
scompile(argv[++i], NULL, 0); |
55 |
else if (!strcmp(argv[i], "-f")) |
56 |
fcompile(argv[++i]); |
57 |
else |
58 |
goto userror; |
59 |
|
60 |
sprintf(stmp, "%s(t)=%s;", XNAME, argv[3]); |
61 |
scompile(stmp, NULL, 0); |
62 |
sprintf(stmp, "%s(t)=%s;", YNAME, argv[4]); |
63 |
scompile(stmp, NULL, 0); |
64 |
sprintf(stmp, "%s(t)=%s;", ZNAME, argv[5]); |
65 |
scompile(stmp, NULL, 0); |
66 |
sprintf(stmp, "%s(t)=%s;", RNAME, argv[6]); |
67 |
scompile(stmp, NULL, 0); |
68 |
nseg = atoi(argv[7]); |
69 |
if (nseg <= 0) |
70 |
goto userror; |
71 |
|
72 |
printhead(argc, argv); |
73 |
eclock = 0; |
74 |
|
75 |
for (i = 0; i <= nseg; i++) { |
76 |
t = (double)i/nseg; |
77 |
p[0] = funvalue(XNAME, 1, &t); |
78 |
p[1] = funvalue(YNAME, 1, &t); |
79 |
p[2] = funvalue(ZNAME, 1, &t); |
80 |
r = funvalue(RNAME, 1, &t); |
81 |
if (i) |
82 |
if (lastr <= r+FTINY && lastr >= r-FTINY) { |
83 |
printf("\n%s cylinder %s.c%d\n", |
84 |
argv[1], argv[2], i); |
85 |
printf("0\n0\n7\n"); |
86 |
printf("%18.12g %18.12g %18.12g\n", |
87 |
lastp[0], lastp[1], lastp[2]); |
88 |
printf("%18.12g %18.12g %18.12g\n", |
89 |
p[0], p[1], p[2]); |
90 |
printf("%18.12g\n", r); |
91 |
} else { |
92 |
printf("\n%s cone %s.c%d\n", |
93 |
argv[1], argv[2], i); |
94 |
printf("0\n0\n8\n"); |
95 |
f = (lastr - r)/dist2(lastp,p); |
96 |
printf("%18.12g %18.12g %18.12g\n", |
97 |
lastp[0] + f*lastr*(p[0] - lastp[0]), |
98 |
lastp[1] + f*lastr*(p[1] - lastp[1]), |
99 |
lastp[2] + f*lastr*(p[2] - lastp[2])); |
100 |
printf("%18.12g %18.12g %18.12g\n", |
101 |
p[0] + f*r*(p[0] - lastp[0]), |
102 |
p[1] + f*r*(p[1] - lastp[1]), |
103 |
p[2] + f*r*(p[2] - lastp[2])); |
104 |
f = 1.0 - (lastr-r)*f; |
105 |
f = f <= 0.0 ? 0.0 : sqrt(f); |
106 |
printf("%18.12g %18.12g\n", f*lastr, f*r); |
107 |
} |
108 |
printf("\n%s sphere %s.s%d\n", argv[1], argv[2], i); |
109 |
printf("0\n0\n4 %18.12g %18.12g %18.12g %18.12g\n", |
110 |
p[0], p[1], p[2], r); |
111 |
VCOPY(lastp, p); |
112 |
lastr = r; |
113 |
} |
114 |
quit(0); |
115 |
|
116 |
userror: |
117 |
fprintf(stderr, |
118 |
"Usage: %s material name x(t) y(t) z(t) r(t) nseg [-e expr] [-f file]\n", |
119 |
argv[0]); |
120 |
quit(1); |
121 |
} |
122 |
|
123 |
|
124 |
eputs(msg) |
125 |
char *msg; |
126 |
{ |
127 |
fputs(msg, stderr); |
128 |
} |
129 |
|
130 |
|
131 |
wputs(msg) |
132 |
char *msg; |
133 |
{ |
134 |
eputs(msg); |
135 |
} |
136 |
|
137 |
|
138 |
quit(code) |
139 |
int code; |
140 |
{ |
141 |
exit(code); |
142 |
} |
143 |
|
144 |
|
145 |
printhead(ac, av) /* print command header */ |
146 |
register int ac; |
147 |
register char **av; |
148 |
{ |
149 |
putchar('#'); |
150 |
while (ac--) { |
151 |
putchar(' '); |
152 |
fputs(*av++, stdout); |
153 |
} |
154 |
putchar('\n'); |
155 |
} |
156 |
|
157 |
|
158 |
double |
159 |
l_hermite() |
160 |
{ |
161 |
double t; |
162 |
|
163 |
t = argument(5); |
164 |
return( argument(1)*((2.0*t-3.0)*t*t+1.0) + |
165 |
argument(2)*(-2.0*t+3.0)*t*t + |
166 |
argument(3)*((t-2.0)*t+1.0)*t + |
167 |
argument(4)*(t-1.0)*t*t ); |
168 |
} |
169 |
|
170 |
|
171 |
double |
172 |
l_bezier() |
173 |
{ |
174 |
double t; |
175 |
|
176 |
t = argument(5); |
177 |
return( argument(1) * (1.+t*(-3.+t*(3.-t))) + |
178 |
argument(2) * 3.*t*(1.+t*(-2.+t)) + |
179 |
argument(3) * 3.*t*t*(1.-t) + |
180 |
argument(4) * t*t*t ); |
181 |
} |
182 |
|
183 |
|
184 |
double |
185 |
l_bspline() |
186 |
{ |
187 |
double t; |
188 |
|
189 |
t = argument(5); |
190 |
return( argument(1) * (1./6.+t*(-1./2.+t*(1./2.-1./6.*t))) + |
191 |
argument(2) * (2./3.+t*t*(-1.+1./2.*t)) + |
192 |
argument(3) * (1./6.+t*(1./2.+t*(1./2.-1./2.*t))) + |
193 |
argument(4) * (1./6.*t*t*t) ); |
194 |
} |