src/common/cone.c

/* Copyright (c) 1992 Regents of the University of California */

#ifndef lint
static char SCCSid[] = "$SunId$ LBL";
#endif

/*
 *  cone.c - routines for making cones
 *
 *     2/12/86
 */

#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");
}


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

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


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:	2.4
Committed:	Thu Nov 19 21:32:48 1992 UTC (31 years, 5 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.3:	+2 -2 lines
Log Message:	insignificant change to freecone()
#	User	Rev	Content
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->slco->sl + co->alco->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	2.4	if (co == NULL)
158	greg	1.5	return;
159	greg	1.1	if (co->tm != NULL)
160			free((char *)co->tm);
161	greg	2.4	free((char *)co);
162	greg	1.1	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			}