src/common/cone.c

#ifndef lint
static const char       RCSid[] = "$Id$";
#endif
/*
 *  cone.c - routines for making cones
 */

#include "copyright.h"

#include  "standard.h"

#include  "object.h"

#include  "otypes.h"

#include  "cone.h"

/*
 *     In general, a cone may be any one of a cone, a cylinder, a ring,
 *  a cup (inverted cone), or a tube (inverted cylinder).
 *     Most cones are specified with a starting point and radius and
 *  an ending point and radius.  In the cases of a cylinder or tube,
 *  only one radius is needed.  In the case of a ring, a normal direction
 *  is specified instead of a second endpoint.
 *
 *      mtype (cone|cup) name
 *      0
 *      0
 *      8 P0x P0y P0z P1x P1y P1z R0 R1
 *
 *      mtype (cylinder|tube) name
 *      0
 *      0
 *      7 P0x P0y P0z P1x P1y P1z R
 *
 *      mtype ring name
 *      0
 *      0
 *      8 Px Py Pz Nx Ny Nz R0 R1
 */


CONE *
getcone(o, getxf)                       /* get cone structure */
register OBJREC  *o;
int  getxf;
{
        int  sgn0, sgn1;
        register CONE  *co;

        if ((co = (CONE *)o->os) == NULL) {

                co = (CONE *)malloc(sizeof(CONE));
                if (co == NULL)
                        error(SYSTEM, "out of memory in makecone");

                co->ca = o->oargs.farg;
                                                /* get radii */
                if (o->otype == OBJ_CYLINDER | o->otype == OBJ_TUBE) {
                        if (o->oargs.nfargs != 7)
                                goto argcerr;
                        if (co->ca[6] < -FTINY) {
                                objerror(o, WARNING, "negative radius");
                                o->otype = o->otype == OBJ_CYLINDER ?
                                                OBJ_TUBE : OBJ_CYLINDER;
                                co->ca[6] = -co->ca[6];
                        } else if (co->ca[6] <= FTINY)
                                goto raderr;
                        co->p0 = 0; co->p1 = 3;
                        co->r0 = co->r1 = 6;
                } else {
                        if (o->oargs.nfargs != 8)
                                goto argcerr;
                        if (co->ca[6] < -FTINY) sgn0 = -1;
                        else if (co->ca[6] > FTINY) sgn0 = 1;
                        else sgn0 = 0;
                        if (co->ca[7] < -FTINY) sgn1 = -1;
                        else if (co->ca[7] > FTINY) sgn1 = 1;
                        else sgn1 = 0;
                        if (sgn0+sgn1 == 0)
                                goto raderr;
                        if (sgn0 < 0 | sgn1 < 0) {
                                objerror(o, o->otype==OBJ_RING?USER:WARNING,
                                        "negative radii");
                                o->otype = o->otype == OBJ_CONE ?
                                                OBJ_CUP : OBJ_CONE;
                        }
                        co->ca[6] = co->ca[6]*sgn0;
                        co->ca[7] = co->ca[7]*sgn1;
                        if (co->ca[7] - co->ca[6] > FTINY) {
                                if (o->otype == OBJ_RING)
                                        co->p0 = co->p1 = 0;
                                else {
                                        co->p0 = 0; co->p1 = 3;
                                }
                                co->r0 = 6; co->r1 = 7;
                        } else if (co->ca[6] - co->ca[7] > FTINY) {
                                if (o->otype == OBJ_RING)
                                        co->p0 = co->p1 = 0;
                                else {
                                        co->p0 = 3; co->p1 = 0;
                                }
                                co->r0 = 7; co->r1 = 6;
                        } else {
                                if (o->otype == OBJ_RING)
                                        goto raderr;
                                o->otype = o->otype == OBJ_CONE ?
                                                OBJ_CYLINDER : OBJ_TUBE;
                                o->oargs.nfargs = 7;
                                co->p0 = 0; co->p1 = 3;
                                co->r0 = co->r1 = 6;
                        }
                }
                                                /* get axis orientation */
                if (o->otype == OBJ_RING)
                        VCOPY(co->ad, o->oargs.farg+3);
                else {
                        co->ad[0] = CO_P1(co)[0] - CO_P0(co)[0];
                        co->ad[1] = CO_P1(co)[1] - CO_P0(co)[1];
                        co->ad[2] = CO_P1(co)[2] - CO_P0(co)[2];
                }
                co->al = normalize(co->ad);
                if (co->al == 0.0)
                        objerror(o, USER, "zero orientation");
                                        /* compute axis and side lengths */
                if (o->otype == OBJ_RING) {
                        co->al = 0.0;
                        co->sl = CO_R1(co) - CO_R0(co);
                } else if (o->otype == OBJ_CONE | o->otype == OBJ_CUP) {
                        co->sl = co->ca[7] - co->ca[6];
                        co->sl = sqrt(co->sl*co->sl + co->al*co->al);
                } else { /* OBJ_CYLINDER or OBJ_TUBE */
                        co->sl = co->al;
                }
                co->tm = NULL;
                o->os = (char *)co;
        }
        if (getxf && co->tm == NULL)
                conexform(co);
        return(co);

argcerr:
        objerror(o, USER, "bad # arguments");
raderr:
        objerror(o, USER, "illegal radii");
}


void
freecone(o)                     /* free memory associated with cone */
OBJREC  *o;
{
        register CONE  *co = (CONE *)o->os;

        if (co == NULL)
                return;
        if (co->tm != NULL)
                free((void *)co->tm);
        free((void *)co);
        o->os = NULL;
}


void
conexform(co)                   /* get cone transformation matrix */
register CONE  *co;
{
        MAT4  m4;
        register double  d;
        register int  i;

        co->tm = (FLOAT (*)[4])malloc(sizeof(MAT4));
        if (co->tm == NULL)
                error(SYSTEM, "out of memory in conexform");

                                /* translate to origin */
        setident4(co->tm);
        if (co->r0 == co->r1)
                d = 0.0;
        else
                d = CO_R0(co) / (CO_R1(co) - CO_R0(co));
        for (i = 0; i < 3; i++)
                co->tm[3][i] = d*(CO_P1(co)[i] - CO_P0(co)[i])
                                - CO_P0(co)[i];
        
                                /* rotate to positive z-axis */
        setident4(m4);
        d = co->ad[1]*co->ad[1] + co->ad[2]*co->ad[2];
        if (d <= FTINY*FTINY) {
                m4[0][0] = 0.0;
                m4[0][2] = co->ad[0];
                m4[2][0] = -co->ad[0];
                m4[2][2] = 0.0;
        } else {
                d = sqrt(d);
                m4[0][0] = d;
                m4[1][0] = -co->ad[0]*co->ad[1]/d;
                m4[2][0] = -co->ad[0]*co->ad[2]/d;
                m4[1][1] = co->ad[2]/d;
                m4[2][1] = -co->ad[1]/d;
                m4[0][2] = co->ad[0];
                m4[1][2] = co->ad[1];
                m4[2][2] = co->ad[2];
        }
        multmat4(co->tm, co->tm, m4);

                                /* scale z-axis */
        if (co->p0 != co->p1 & co->r0 != co->r1) {
                setident4(m4);
                m4[2][2] = (CO_R1(co) - CO_R0(co)) / co->al;
                multmat4(co->tm, co->tm, m4);
        }
}
Revision:	2.6
Committed:	Tue Feb 25 02:47:21 2003 UTC (21 years, 2 months ago) by greg
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rad3R5
Changes since 2.5:	+1 -56 lines
Log Message:	Replaced inline copyright notice with #include "copyright.h"
#	Content
1	#ifndef lint
2	static const char RCSid[] = "$Id$";
3	#endif
4	/*
5	* cone.c - routines for making cones
6	*/
7
8	#include "copyright.h"
9
10	#include "standard.h"
11
12	#include "object.h"
13
14	#include "otypes.h"
15
16	#include "cone.h"
17
18	/*
19	* In general, a cone may be any one of a cone, a cylinder, a ring,
20	* a cup (inverted cone), or a tube (inverted cylinder).
21	* Most cones are specified with a starting point and radius and
22	* an ending point and radius. In the cases of a cylinder or tube,
23	* only one radius is needed. In the case of a ring, a normal direction
24	* is specified instead of a second endpoint.
25	*
26	* mtype (cone\|cup) name
27	* 0
28	* 0
29	* 8 P0x P0y P0z P1x P1y P1z R0 R1
30	*
31	* mtype (cylinder\|tube) name
32	* 0
33	* 0
34	* 7 P0x P0y P0z P1x P1y P1z R
35	*
36	* mtype ring name
37	* 0
38	* 0
39	* 8 Px Py Pz Nx Ny Nz R0 R1
40	*/
41
42
43	CONE *
44	getcone(o, getxf) /* get cone structure */
45	register OBJREC *o;
46	int getxf;
47	{
48	int sgn0, sgn1;
49	register CONE *co;
50
51	if ((co = (CONE *)o->os) == NULL) {
52
53	co = (CONE *)malloc(sizeof(CONE));
54	if (co == NULL)
55	error(SYSTEM, "out of memory in makecone");
56
57	co->ca = o->oargs.farg;
58	/* get radii */
59	if (o->otype == OBJ_CYLINDER \| o->otype == OBJ_TUBE) {
60	if (o->oargs.nfargs != 7)
61	goto argcerr;
62	if (co->ca[6] < -FTINY) {
63	objerror(o, WARNING, "negative radius");
64	o->otype = o->otype == OBJ_CYLINDER ?
65	OBJ_TUBE : OBJ_CYLINDER;
66	co->ca[6] = -co->ca[6];
67	} else if (co->ca[6] <= FTINY)
68	goto raderr;
69	co->p0 = 0; co->p1 = 3;
70	co->r0 = co->r1 = 6;
71	} else {
72	if (o->oargs.nfargs != 8)
73	goto argcerr;
74	if (co->ca[6] < -FTINY) sgn0 = -1;
75	else if (co->ca[6] > FTINY) sgn0 = 1;
76	else sgn0 = 0;
77	if (co->ca[7] < -FTINY) sgn1 = -1;
78	else if (co->ca[7] > FTINY) sgn1 = 1;
79	else sgn1 = 0;
80	if (sgn0+sgn1 == 0)
81	goto raderr;
82	if (sgn0 < 0 \| sgn1 < 0) {
83	objerror(o, o->otype==OBJ_RING?USER:WARNING,
84	"negative radii");
85	o->otype = o->otype == OBJ_CONE ?
86	OBJ_CUP : OBJ_CONE;
87	}
88	co->ca[6] = co->ca[6]*sgn0;
89	co->ca[7] = co->ca[7]*sgn1;
90	if (co->ca[7] - co->ca[6] > FTINY) {
91	if (o->otype == OBJ_RING)
92	co->p0 = co->p1 = 0;
93	else {
94	co->p0 = 0; co->p1 = 3;
95	}
96	co->r0 = 6; co->r1 = 7;
97	} else if (co->ca[6] - co->ca[7] > FTINY) {
98	if (o->otype == OBJ_RING)
99	co->p0 = co->p1 = 0;
100	else {
101	co->p0 = 3; co->p1 = 0;
102	}
103	co->r0 = 7; co->r1 = 6;
104	} else {
105	if (o->otype == OBJ_RING)
106	goto raderr;
107	o->otype = o->otype == OBJ_CONE ?
108	OBJ_CYLINDER : OBJ_TUBE;
109	o->oargs.nfargs = 7;
110	co->p0 = 0; co->p1 = 3;
111	co->r0 = co->r1 = 6;
112	}
113	}
114	/* get axis orientation */
115	if (o->otype == OBJ_RING)
116	VCOPY(co->ad, o->oargs.farg+3);
117	else {
118	co->ad[0] = CO_P1(co)[0] - CO_P0(co)[0];
119	co->ad[1] = CO_P1(co)[1] - CO_P0(co)[1];
120	co->ad[2] = CO_P1(co)[2] - CO_P0(co)[2];
121	}
122	co->al = normalize(co->ad);
123	if (co->al == 0.0)
124	objerror(o, USER, "zero orientation");
125	/* compute axis and side lengths */
126	if (o->otype == OBJ_RING) {
127	co->al = 0.0;
128	co->sl = CO_R1(co) - CO_R0(co);
129	} else if (o->otype == OBJ_CONE \| o->otype == OBJ_CUP) {
130	co->sl = co->ca[7] - co->ca[6];
131	co->sl = sqrt(co->slco->sl + co->alco->al);
132	} else { /* OBJ_CYLINDER or OBJ_TUBE */
133	co->sl = co->al;
134	}
135	co->tm = NULL;
136	o->os = (char *)co;
137	}
138	if (getxf && co->tm == NULL)
139	conexform(co);
140	return(co);
141
142	argcerr:
143	objerror(o, USER, "bad # arguments");
144	raderr:
145	objerror(o, USER, "illegal radii");
146	}
147
148
149	void
150	freecone(o) /* free memory associated with cone */
151	OBJREC *o;
152	{
153	register CONE co = (CONE )o->os;
154
155	if (co == NULL)
156	return;
157	if (co->tm != NULL)
158	free((void *)co->tm);
159	free((void *)co);
160	o->os = NULL;
161	}
162
163
164	void
165	conexform(co) /* get cone transformation matrix */
166	register CONE *co;
167	{
168	MAT4 m4;
169	register double d;
170	register int i;
171
172	co->tm = (FLOAT (*)[4])malloc(sizeof(MAT4));
173	if (co->tm == NULL)
174	error(SYSTEM, "out of memory in conexform");
175
176	/* translate to origin */
177	setident4(co->tm);
178	if (co->r0 == co->r1)
179	d = 0.0;
180	else
181	d = CO_R0(co) / (CO_R1(co) - CO_R0(co));
182	for (i = 0; i < 3; i++)
183	co->tm[3][i] = d*(CO_P1(co)[i] - CO_P0(co)[i])
184	- CO_P0(co)[i];
185
186	/* rotate to positive z-axis */
187	setident4(m4);
188	d = co->ad[1]co->ad[1] + co->ad[2]co->ad[2];
189	if (d <= FTINY*FTINY) {
190	m4[0][0] = 0.0;
191	m4[0][2] = co->ad[0];
192	m4[2][0] = -co->ad[0];
193	m4[2][2] = 0.0;
194	} else {
195	d = sqrt(d);
196	m4[0][0] = d;
197	m4[1][0] = -co->ad[0]*co->ad[1]/d;
198	m4[2][0] = -co->ad[0]*co->ad[2]/d;
199	m4[1][1] = co->ad[2]/d;
200	m4[2][1] = -co->ad[1]/d;
201	m4[0][2] = co->ad[0];
202	m4[1][2] = co->ad[1];
203	m4[2][2] = co->ad[2];
204	}
205	multmat4(co->tm, co->tm, m4);
206
207	/* scale z-axis */
208	if (co->p0 != co->p1 & co->r0 != co->r1) {
209	setident4(m4);
210	m4[2][2] = (CO_R1(co) - CO_R0(co)) / co->al;
211	multmat4(co->tm, co->tm, m4);
212	}
213	}