src/common/cone.c

#ifndef lint
static const char       RCSid[] = "$Id: cone.c,v 2.8 2003/06/26 00:58:09 schorsch Exp $";
#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");
        return NULL; /* pro forma return */
}


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 = (RREAL (*)[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:	2.9
Committed:	Sun Jul 27 22:12:01 2003 UTC (20 years, 9 months ago) by schorsch
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rad4R2P2, rad5R0, rad3R7P2, rad3R7P1, rad4R2, rad4R1, rad4R0, rad3R6, rad3R6P1, rad3R8, rad3R9, rad4R2P1
Changes since 2.8:	+5 -5 lines
Log Message:	Added grouping parens to reduce ambiguity warnings.
#	User	Rev	Content
1	greg	1.1	#ifndef lint
2	schorsch	2.9	static const char RCSid[] = "$Id: cone.c,v 2.8 2003/06/26 00:58:09 schorsch Exp $";
3	greg	1.1	#endif
4			/*
5			* cone.c - routines for making cones
6	greg	2.5	*/
7
8	greg	2.6	#include "copyright.h"
9	greg	1.1
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	greg	1.4	int sgn0, sgn1;
49	greg	1.1	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	schorsch	2.9	if ((o->otype == OBJ_CYLINDER) \| (o->otype == OBJ_TUBE)) {
60	greg	1.1	if (o->oargs.nfargs != 7)
61			goto argcerr;
62	greg	1.4	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	greg	1.1	goto raderr;
69	greg	2.2	co->p0 = 0; co->p1 = 3;
70	greg	1.1	co->r0 = co->r1 = 6;
71			} else {
72			if (o->oargs.nfargs != 8)
73			goto argcerr;
74	greg	1.4	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	greg	1.1	goto raderr;
82	schorsch	2.9	if ((sgn0 < 0) \| (sgn1 < 0)) {
83	greg	1.4	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	greg	2.2	if (co->ca[7] - co->ca[6] > FTINY) {
91	greg	1.4	if (o->otype == OBJ_RING)
92	greg	2.2	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	greg	1.4	goto raderr;
107			o->otype = o->otype == OBJ_CONE ?
108			OBJ_CYLINDER : OBJ_TUBE;
109			o->oargs.nfargs = 7;
110	greg	2.2	co->p0 = 0; co->p1 = 3;
111			co->r0 = co->r1 = 6;
112	greg	1.4	}
113	greg	1.1	}
114			/* get axis orientation */
115	greg	2.2	if (o->otype == OBJ_RING)
116	greg	1.1	VCOPY(co->ad, o->oargs.farg+3);
117	greg	2.2	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	greg	1.1	}
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	greg	2.2	co->sl = CO_R1(co) - CO_R0(co);
129	schorsch	2.9	} else if ((o->otype == OBJ_CONE) \| (o->otype == OBJ_CUP)) {
130	greg	1.1	co->sl = co->ca[7] - co->ca[6];
131			co->sl = sqrt(co->slco->sl + co->alco->al);
132	greg	2.2	} else { /* OBJ_CYLINDER or OBJ_TUBE */
133	greg	1.1	co->sl = co->al;
134			}
135			co->tm = NULL;
136	greg	1.2	o->os = (char *)co;
137	greg	1.1	}
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	schorsch	2.7	return NULL; /* pro forma return */
147	greg	1.1	}
148
149
150	greg	2.5	void
151	greg	1.1	freecone(o) /* free memory associated with cone */
152			OBJREC *o;
153			{
154			register CONE co = (CONE )o->os;
155
156	greg	2.4	if (co == NULL)
157	greg	1.5	return;
158	greg	1.1	if (co->tm != NULL)
159	greg	2.5	free((void *)co->tm);
160			free((void *)co);
161	greg	1.1	o->os = NULL;
162			}
163
164
165	greg	2.5	void
166	greg	1.1	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	schorsch	2.8	co->tm = (RREAL (*)[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	schorsch	2.9	if ((co->p0 != co->p1) & (co->r0 != co->r1)) {
210	greg	2.2	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			}