1 |
greg |
2.2 |
/* Copyright (c) 1992 Regents of the University of California */ |
2 |
greg |
1.1 |
|
3 |
|
|
#ifndef lint |
4 |
|
|
static char SCCSid[] = "$SunId$ LBL"; |
5 |
|
|
#endif |
6 |
|
|
|
7 |
|
|
/* |
8 |
|
|
* cone.c - routines for making cones |
9 |
|
|
* |
10 |
|
|
* 2/12/86 |
11 |
|
|
*/ |
12 |
|
|
|
13 |
|
|
#include "standard.h" |
14 |
|
|
|
15 |
|
|
#include "object.h" |
16 |
|
|
|
17 |
|
|
#include "otypes.h" |
18 |
|
|
|
19 |
|
|
#include "cone.h" |
20 |
|
|
|
21 |
|
|
/* |
22 |
|
|
* In general, a cone may be any one of a cone, a cylinder, a ring, |
23 |
|
|
* a cup (inverted cone), or a tube (inverted cylinder). |
24 |
|
|
* Most cones are specified with a starting point and radius and |
25 |
|
|
* an ending point and radius. In the cases of a cylinder or tube, |
26 |
|
|
* only one radius is needed. In the case of a ring, a normal direction |
27 |
|
|
* is specified instead of a second endpoint. |
28 |
|
|
* |
29 |
|
|
* mtype (cone|cup) name |
30 |
|
|
* 0 |
31 |
|
|
* 0 |
32 |
|
|
* 8 P0x P0y P0z P1x P1y P1z R0 R1 |
33 |
|
|
* |
34 |
|
|
* mtype (cylinder|tube) name |
35 |
|
|
* 0 |
36 |
|
|
* 0 |
37 |
|
|
* 7 P0x P0y P0z P1x P1y P1z R |
38 |
|
|
* |
39 |
|
|
* mtype ring name |
40 |
|
|
* 0 |
41 |
|
|
* 0 |
42 |
|
|
* 8 Px Py Pz Nx Ny Nz R0 R1 |
43 |
|
|
*/ |
44 |
|
|
|
45 |
|
|
|
46 |
|
|
CONE * |
47 |
|
|
getcone(o, getxf) /* get cone structure */ |
48 |
|
|
register OBJREC *o; |
49 |
|
|
int getxf; |
50 |
|
|
{ |
51 |
greg |
1.4 |
int sgn0, sgn1; |
52 |
greg |
1.1 |
register CONE *co; |
53 |
|
|
|
54 |
|
|
if ((co = (CONE *)o->os) == NULL) { |
55 |
|
|
|
56 |
|
|
co = (CONE *)malloc(sizeof(CONE)); |
57 |
|
|
if (co == NULL) |
58 |
|
|
error(SYSTEM, "out of memory in makecone"); |
59 |
|
|
|
60 |
|
|
co->ca = o->oargs.farg; |
61 |
|
|
/* get radii */ |
62 |
greg |
2.2 |
if (o->otype == OBJ_CYLINDER | o->otype == OBJ_TUBE) { |
63 |
greg |
1.1 |
if (o->oargs.nfargs != 7) |
64 |
|
|
goto argcerr; |
65 |
greg |
1.4 |
if (co->ca[6] < -FTINY) { |
66 |
|
|
objerror(o, WARNING, "negative radius"); |
67 |
|
|
o->otype = o->otype == OBJ_CYLINDER ? |
68 |
|
|
OBJ_TUBE : OBJ_CYLINDER; |
69 |
|
|
co->ca[6] = -co->ca[6]; |
70 |
|
|
} else if (co->ca[6] <= FTINY) |
71 |
greg |
1.1 |
goto raderr; |
72 |
greg |
2.2 |
co->p0 = 0; co->p1 = 3; |
73 |
greg |
1.1 |
co->r0 = co->r1 = 6; |
74 |
|
|
} else { |
75 |
|
|
if (o->oargs.nfargs != 8) |
76 |
|
|
goto argcerr; |
77 |
greg |
1.4 |
if (co->ca[6] < -FTINY) sgn0 = -1; |
78 |
|
|
else if (co->ca[6] > FTINY) sgn0 = 1; |
79 |
|
|
else sgn0 = 0; |
80 |
|
|
if (co->ca[7] < -FTINY) sgn1 = -1; |
81 |
|
|
else if (co->ca[7] > FTINY) sgn1 = 1; |
82 |
|
|
else sgn1 = 0; |
83 |
|
|
if (sgn0+sgn1 == 0) |
84 |
greg |
1.1 |
goto raderr; |
85 |
greg |
2.2 |
if (sgn0 < 0 | sgn1 < 0) { |
86 |
greg |
1.4 |
objerror(o, o->otype==OBJ_RING?USER:WARNING, |
87 |
|
|
"negative radii"); |
88 |
|
|
o->otype = o->otype == OBJ_CONE ? |
89 |
|
|
OBJ_CUP : OBJ_CONE; |
90 |
|
|
} |
91 |
|
|
co->ca[6] = co->ca[6]*sgn0; |
92 |
|
|
co->ca[7] = co->ca[7]*sgn1; |
93 |
greg |
2.2 |
if (co->ca[7] - co->ca[6] > FTINY) { |
94 |
greg |
1.4 |
if (o->otype == OBJ_RING) |
95 |
greg |
2.2 |
co->p0 = co->p1 = 0; |
96 |
|
|
else { |
97 |
|
|
co->p0 = 0; co->p1 = 3; |
98 |
|
|
} |
99 |
|
|
co->r0 = 6; co->r1 = 7; |
100 |
|
|
} else if (co->ca[6] - co->ca[7] > FTINY) { |
101 |
|
|
if (o->otype == OBJ_RING) |
102 |
|
|
co->p0 = co->p1 = 0; |
103 |
|
|
else { |
104 |
|
|
co->p0 = 3; co->p1 = 0; |
105 |
|
|
} |
106 |
|
|
co->r0 = 7; co->r1 = 6; |
107 |
|
|
} else { |
108 |
|
|
if (o->otype == OBJ_RING) |
109 |
greg |
1.4 |
goto raderr; |
110 |
|
|
o->otype = o->otype == OBJ_CONE ? |
111 |
|
|
OBJ_CYLINDER : OBJ_TUBE; |
112 |
|
|
o->oargs.nfargs = 7; |
113 |
greg |
2.2 |
co->p0 = 0; co->p1 = 3; |
114 |
|
|
co->r0 = co->r1 = 6; |
115 |
greg |
1.4 |
} |
116 |
greg |
1.1 |
} |
117 |
|
|
/* get axis orientation */ |
118 |
greg |
2.2 |
if (o->otype == OBJ_RING) |
119 |
greg |
1.1 |
VCOPY(co->ad, o->oargs.farg+3); |
120 |
greg |
2.2 |
else { |
121 |
|
|
co->ad[0] = CO_P1(co)[0] - CO_P0(co)[0]; |
122 |
|
|
co->ad[1] = CO_P1(co)[1] - CO_P0(co)[1]; |
123 |
|
|
co->ad[2] = CO_P1(co)[2] - CO_P0(co)[2]; |
124 |
greg |
1.1 |
} |
125 |
|
|
co->al = normalize(co->ad); |
126 |
|
|
if (co->al == 0.0) |
127 |
|
|
objerror(o, USER, "zero orientation"); |
128 |
|
|
/* compute axis and side lengths */ |
129 |
|
|
if (o->otype == OBJ_RING) { |
130 |
|
|
co->al = 0.0; |
131 |
greg |
2.2 |
co->sl = CO_R1(co) - CO_R0(co); |
132 |
|
|
} else if (o->otype == OBJ_CONE | o->otype == OBJ_CUP) { |
133 |
greg |
1.1 |
co->sl = co->ca[7] - co->ca[6]; |
134 |
|
|
co->sl = sqrt(co->sl*co->sl + co->al*co->al); |
135 |
greg |
2.2 |
} else { /* OBJ_CYLINDER or OBJ_TUBE */ |
136 |
greg |
1.1 |
co->sl = co->al; |
137 |
|
|
} |
138 |
|
|
co->tm = NULL; |
139 |
greg |
1.2 |
o->os = (char *)co; |
140 |
greg |
1.1 |
} |
141 |
|
|
if (getxf && co->tm == NULL) |
142 |
|
|
conexform(co); |
143 |
|
|
return(co); |
144 |
|
|
|
145 |
|
|
argcerr: |
146 |
|
|
objerror(o, USER, "bad # arguments"); |
147 |
|
|
raderr: |
148 |
|
|
objerror(o, USER, "illegal radii"); |
149 |
|
|
} |
150 |
|
|
|
151 |
|
|
|
152 |
|
|
freecone(o) /* free memory associated with cone */ |
153 |
|
|
OBJREC *o; |
154 |
|
|
{ |
155 |
|
|
register CONE *co = (CONE *)o->os; |
156 |
|
|
|
157 |
greg |
1.5 |
if (o->os == NULL) |
158 |
|
|
return; |
159 |
greg |
1.1 |
if (co->tm != NULL) |
160 |
|
|
free((char *)co->tm); |
161 |
|
|
free(o->os); |
162 |
|
|
o->os = NULL; |
163 |
|
|
} |
164 |
|
|
|
165 |
|
|
|
166 |
|
|
conexform(co) /* get cone transformation matrix */ |
167 |
|
|
register CONE *co; |
168 |
|
|
{ |
169 |
greg |
1.6 |
MAT4 m4; |
170 |
greg |
1.1 |
register double d; |
171 |
|
|
register int i; |
172 |
|
|
|
173 |
greg |
2.2 |
co->tm = (FLOAT (*)[4])malloc(sizeof(MAT4)); |
174 |
greg |
1.1 |
if (co->tm == NULL) |
175 |
|
|
error(SYSTEM, "out of memory in conexform"); |
176 |
|
|
|
177 |
|
|
/* translate to origin */ |
178 |
|
|
setident4(co->tm); |
179 |
|
|
if (co->r0 == co->r1) |
180 |
|
|
d = 0.0; |
181 |
|
|
else |
182 |
greg |
2.2 |
d = CO_R0(co) / (CO_R1(co) - CO_R0(co)); |
183 |
greg |
1.1 |
for (i = 0; i < 3; i++) |
184 |
greg |
2.2 |
co->tm[3][i] = d*(CO_P1(co)[i] - CO_P0(co)[i]) |
185 |
|
|
- CO_P0(co)[i]; |
186 |
greg |
1.1 |
|
187 |
|
|
/* rotate to positive z-axis */ |
188 |
|
|
setident4(m4); |
189 |
|
|
d = co->ad[1]*co->ad[1] + co->ad[2]*co->ad[2]; |
190 |
|
|
if (d <= FTINY*FTINY) { |
191 |
|
|
m4[0][0] = 0.0; |
192 |
|
|
m4[0][2] = co->ad[0]; |
193 |
|
|
m4[2][0] = -co->ad[0]; |
194 |
|
|
m4[2][2] = 0.0; |
195 |
|
|
} else { |
196 |
|
|
d = sqrt(d); |
197 |
|
|
m4[0][0] = d; |
198 |
|
|
m4[1][0] = -co->ad[0]*co->ad[1]/d; |
199 |
|
|
m4[2][0] = -co->ad[0]*co->ad[2]/d; |
200 |
|
|
m4[1][1] = co->ad[2]/d; |
201 |
|
|
m4[2][1] = -co->ad[1]/d; |
202 |
|
|
m4[0][2] = co->ad[0]; |
203 |
|
|
m4[1][2] = co->ad[1]; |
204 |
|
|
m4[2][2] = co->ad[2]; |
205 |
|
|
} |
206 |
|
|
multmat4(co->tm, co->tm, m4); |
207 |
|
|
|
208 |
|
|
/* scale z-axis */ |
209 |
greg |
2.2 |
if (co->p0 != co->p1 & co->r0 != co->r1) { |
210 |
|
|
setident4(m4); |
211 |
|
|
m4[2][2] = (CO_R1(co) - CO_R0(co)) / co->al; |
212 |
|
|
multmat4(co->tm, co->tm, m4); |
213 |
greg |
1.1 |
} |
214 |
|
|
} |