1 |
/* Copyright (c) 1986 Regents of the University of California */ |
2 |
|
3 |
#ifndef lint |
4 |
static char SCCSid[] = "$SunId$ LBL"; |
5 |
#endif |
6 |
|
7 |
/* |
8 |
* xf.c - routines to convert transform arguments into 4X4 matrix. |
9 |
* |
10 |
* 1/28/86 |
11 |
*/ |
12 |
|
13 |
|
14 |
#define PI 3.14159265358979323846 |
15 |
|
16 |
#define checkarg(a,n) if (strcmp(av[i],a) || i+n >= ac) goto done |
17 |
|
18 |
|
19 |
int |
20 |
xf(retmat, retsca, ac, av) /* get transform specification */ |
21 |
double retmat[4][4]; |
22 |
double *retsca; |
23 |
int ac; |
24 |
char *av[]; |
25 |
{ |
26 |
double atof(), sin(), cos(); |
27 |
double xfmat[4][4], m4[4][4]; |
28 |
double xfsca, theta; |
29 |
int i, j; |
30 |
int rept; |
31 |
|
32 |
setident4(retmat); |
33 |
*retsca = 1.0; |
34 |
|
35 |
rept = 1; |
36 |
setident4(xfmat); |
37 |
xfsca = 1.0; |
38 |
|
39 |
for (i = 0; i < ac && av[i][0] == '-'; i++) { |
40 |
|
41 |
setident4(m4); |
42 |
|
43 |
switch (av[i][1]) { |
44 |
|
45 |
case 't': /* translate */ |
46 |
checkarg("-t",3); |
47 |
m4[3][0] = atof(av[++i]); |
48 |
m4[3][1] = atof(av[++i]); |
49 |
m4[3][2] = atof(av[++i]); |
50 |
break; |
51 |
|
52 |
case 'r': /* rotate */ |
53 |
switch (av[i][2]) { |
54 |
case 'x': |
55 |
checkarg("-rx",1); |
56 |
theta = PI/180.0 * atof(av[++i]); |
57 |
m4[1][1] = m4[2][2] = cos(theta); |
58 |
m4[2][1] = -(m4[1][2] = sin(theta)); |
59 |
break; |
60 |
case 'y': |
61 |
checkarg("-ry",1); |
62 |
theta = PI/180.0 * atof(av[++i]); |
63 |
m4[0][0] = m4[2][2] = cos(theta); |
64 |
m4[0][2] = -(m4[2][0] = sin(theta)); |
65 |
break; |
66 |
case 'z': |
67 |
checkarg("-rz",1); |
68 |
theta = PI/180.0 * atof(av[++i]); |
69 |
m4[0][0] = m4[1][1] = cos(theta); |
70 |
m4[1][0] = -(m4[0][1] = sin(theta)); |
71 |
break; |
72 |
default: |
73 |
return(i); |
74 |
} |
75 |
break; |
76 |
|
77 |
case 's': /* scale */ |
78 |
checkarg("-s",1); |
79 |
xfsca *= |
80 |
m4[0][0] = |
81 |
m4[1][1] = |
82 |
m4[2][2] = atof(av[++i]); |
83 |
break; |
84 |
|
85 |
case 'm': /* mirror */ |
86 |
switch (av[i][2]) { |
87 |
case 'x': |
88 |
checkarg("-mx",0); |
89 |
xfsca *= |
90 |
m4[0][0] = -1.0; |
91 |
break; |
92 |
case 'y': |
93 |
checkarg("-my",0); |
94 |
xfsca *= |
95 |
m4[1][1] = -1.0; |
96 |
break; |
97 |
case 'z': |
98 |
checkarg("-mz",0); |
99 |
xfsca *= |
100 |
m4[2][2] = -1.0; |
101 |
break; |
102 |
default: |
103 |
return(i); |
104 |
} |
105 |
break; |
106 |
|
107 |
case 'i': /* iterate */ |
108 |
checkarg("-i",1); |
109 |
for (j = 0; j < rept; j++) { |
110 |
multmat4(retmat, retmat, xfmat); |
111 |
*retsca *= xfsca; |
112 |
} |
113 |
rept = atoi(av[++i]); |
114 |
setident4(xfmat); |
115 |
xfsca = 1.0; |
116 |
break; |
117 |
|
118 |
default: |
119 |
return(i); |
120 |
|
121 |
} |
122 |
multmat4(xfmat, xfmat, m4); |
123 |
} |
124 |
done: |
125 |
for (j = 0; j < rept; j++) { |
126 |
multmat4(retmat, retmat, xfmat); |
127 |
*retsca *= xfsca; |
128 |
} |
129 |
return(i); |
130 |
} |
131 |
|
132 |
|
133 |
#ifdef INVXF |
134 |
int |
135 |
invxf(retmat, retsca, ac, av) /* invert transform specification */ |
136 |
double retmat[4][4]; |
137 |
double *retsca; |
138 |
int ac; |
139 |
char *av[]; |
140 |
{ |
141 |
double atof(), sin(), cos(); |
142 |
double xfmat[4][4], m4[4][4]; |
143 |
double xfsca, theta; |
144 |
int i, j; |
145 |
int rept; |
146 |
|
147 |
setident4(retmat); |
148 |
*retsca = 1.0; |
149 |
|
150 |
rept = 1; |
151 |
setident4(xfmat); |
152 |
xfsca = 1.0; |
153 |
|
154 |
for (i = 0; i < ac && av[i][0] == '-'; i++) { |
155 |
|
156 |
setident4(m4); |
157 |
|
158 |
switch (av[i][1]) { |
159 |
|
160 |
case 't': /* translate */ |
161 |
checkarg("-t",3); |
162 |
m4[3][0] = -atof(av[++i]); |
163 |
m4[3][1] = -atof(av[++i]); |
164 |
m4[3][2] = -atof(av[++i]); |
165 |
break; |
166 |
|
167 |
case 'r': /* rotate */ |
168 |
switch (av[i][2]) { |
169 |
case 'x': |
170 |
checkarg("-rx",1); |
171 |
theta = -PI/180.0 * atof(av[++i]); |
172 |
m4[1][1] = m4[2][2] = cos(theta); |
173 |
m4[2][1] = -(m4[1][2] = sin(theta)); |
174 |
break; |
175 |
case 'y': |
176 |
checkarg("-ry",1); |
177 |
theta = -PI/180.0 * atof(av[++i]); |
178 |
m4[0][0] = m4[2][2] = cos(theta); |
179 |
m4[0][2] = -(m4[2][0] = sin(theta)); |
180 |
break; |
181 |
case 'z': |
182 |
checkarg("-rz",1); |
183 |
theta = -PI/180.0 * atof(av[++i]); |
184 |
m4[0][0] = m4[1][1] = cos(theta); |
185 |
m4[1][0] = -(m4[0][1] = sin(theta)); |
186 |
break; |
187 |
default: |
188 |
return(i); |
189 |
} |
190 |
break; |
191 |
|
192 |
case 's': /* scale */ |
193 |
checkarg("-s",1); |
194 |
*xfsca *= |
195 |
m4[0][0] = |
196 |
m4[1][1] = |
197 |
m4[2][2] = 1.0 / atof(av[++i]); |
198 |
break; |
199 |
|
200 |
case 'm': /* mirror */ |
201 |
switch (av[i][2]) { |
202 |
case 'x': |
203 |
checkarg("-mx",0); |
204 |
*xfsca *= |
205 |
m4[0][0] = -1.0; |
206 |
break; |
207 |
case 'y': |
208 |
checkarg("-my",0); |
209 |
*xfsca *= |
210 |
m4[1][1] = -1.0; |
211 |
break; |
212 |
case 'z': |
213 |
checkarg("-mz",0); |
214 |
*xfsca *= |
215 |
m4[2][2] = -1.0; |
216 |
break; |
217 |
default: |
218 |
return(i); |
219 |
} |
220 |
break; |
221 |
|
222 |
case 'i': /* iterate */ |
223 |
checkarg("-i",1); |
224 |
for (j = 0; j < rept; j++) { |
225 |
multmat4(retmat, xfmat, retmat); |
226 |
*retsca *= xfsca; |
227 |
} |
228 |
rept = atoi(av[++i]); |
229 |
setident4(xfmat); |
230 |
xfsca = 1.0; |
231 |
break; |
232 |
|
233 |
default: |
234 |
return(i); |
235 |
|
236 |
} |
237 |
multmat4(xfmat, m4, xfmat); /* left multiply */ |
238 |
} |
239 |
done: |
240 |
for (j = 0; j < rept; j++) { |
241 |
multmat4(retmat, xfmat, retmat); |
242 |
*retsca *= xfsca; |
243 |
} |
244 |
return(i); |
245 |
} |
246 |
#endif |