src/common/cone.c

#ifndef lint
static const char       RCSid[] = "$Id: cone.c,v 2.9 2003/07/27 22:12:01 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(                                /* get cone structure */
        OBJREC  *o,
        int  getxf
)
{
        int  sgn0, sgn1;
        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, WARNING, "unknown orientation");
                        free(co);
                        return(NULL);
                }
                                        /* 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, WARNING, "illegal radii");
        free(co);
        return(NULL);
}


void
freecone(OBJREC *o)             /* free memory associated with cone */
{
        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(CONE *co)                     /* get cone transformation matrix */
{
        MAT4  m4;
        double  d;
        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:	2.10
Committed:	Thu Apr 21 00:40:35 2016 UTC (8 years ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.9:	+19 -16 lines
Log Message:	Made zero cone and ring radii non-fatal (degenerate -> ignore)
#	User	Rev	Content
1	greg	1.1	#ifndef lint
2	greg	2.10	static const char RCSid[] = "$Id: cone.c,v 2.9 2003/07/27 22:12:01 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	greg	2.10	getcone( /* get cone structure */
45			OBJREC *o,
46			int getxf
47			)
48	greg	1.1	{
49	greg	1.4	int sgn0, sgn1;
50	greg	2.10	CONE *co;
51	greg	1.1
52			if ((co = (CONE *)o->os) == NULL) {
53
54			co = (CONE *)malloc(sizeof(CONE));
55			if (co == NULL)
56			error(SYSTEM, "out of memory in makecone");
57
58			co->ca = o->oargs.farg;
59			/* get radii */
60	schorsch	2.9	if ((o->otype == OBJ_CYLINDER) \| (o->otype == OBJ_TUBE)) {
61	greg	1.1	if (o->oargs.nfargs != 7)
62			goto argcerr;
63	greg	1.4	if (co->ca[6] < -FTINY) {
64			objerror(o, WARNING, "negative radius");
65			o->otype = o->otype == OBJ_CYLINDER ?
66			OBJ_TUBE : OBJ_CYLINDER;
67			co->ca[6] = -co->ca[6];
68			} else if (co->ca[6] <= FTINY)
69	greg	1.1	goto raderr;
70	greg	2.2	co->p0 = 0; co->p1 = 3;
71	greg	1.1	co->r0 = co->r1 = 6;
72			} else {
73			if (o->oargs.nfargs != 8)
74			goto argcerr;
75	greg	1.4	if (co->ca[6] < -FTINY) sgn0 = -1;
76			else if (co->ca[6] > FTINY) sgn0 = 1;
77			else sgn0 = 0;
78			if (co->ca[7] < -FTINY) sgn1 = -1;
79			else if (co->ca[7] > FTINY) sgn1 = 1;
80			else sgn1 = 0;
81			if (sgn0+sgn1 == 0)
82	greg	1.1	goto raderr;
83	schorsch	2.9	if ((sgn0 < 0) \| (sgn1 < 0)) {
84	greg	1.4	objerror(o, o->otype==OBJ_RING?USER:WARNING,
85			"negative radii");
86			o->otype = o->otype == OBJ_CONE ?
87			OBJ_CUP : OBJ_CONE;
88			}
89			co->ca[6] = co->ca[6]*sgn0;
90			co->ca[7] = co->ca[7]*sgn1;
91	greg	2.2	if (co->ca[7] - co->ca[6] > FTINY) {
92	greg	1.4	if (o->otype == OBJ_RING)
93	greg	2.2	co->p0 = co->p1 = 0;
94			else {
95			co->p0 = 0; co->p1 = 3;
96			}
97			co->r0 = 6; co->r1 = 7;
98			} else if (co->ca[6] - co->ca[7] > FTINY) {
99			if (o->otype == OBJ_RING)
100			co->p0 = co->p1 = 0;
101			else {
102			co->p0 = 3; co->p1 = 0;
103			}
104			co->r0 = 7; co->r1 = 6;
105			} else {
106			if (o->otype == OBJ_RING)
107	greg	1.4	goto raderr;
108			o->otype = o->otype == OBJ_CONE ?
109			OBJ_CYLINDER : OBJ_TUBE;
110			o->oargs.nfargs = 7;
111	greg	2.2	co->p0 = 0; co->p1 = 3;
112			co->r0 = co->r1 = 6;
113	greg	1.4	}
114	greg	1.1	}
115			/* get axis orientation */
116	greg	2.2	if (o->otype == OBJ_RING)
117	greg	1.1	VCOPY(co->ad, o->oargs.farg+3);
118	greg	2.2	else {
119			co->ad[0] = CO_P1(co)[0] - CO_P0(co)[0];
120			co->ad[1] = CO_P1(co)[1] - CO_P0(co)[1];
121			co->ad[2] = CO_P1(co)[2] - CO_P0(co)[2];
122	greg	1.1	}
123			co->al = normalize(co->ad);
124	greg	2.10	if (co->al == 0.0) {
125			objerror(o, WARNING, "unknown orientation");
126			free(co);
127			return(NULL);
128			}
129	greg	1.1	/* compute axis and side lengths */
130			if (o->otype == OBJ_RING) {
131			co->al = 0.0;
132	greg	2.2	co->sl = CO_R1(co) - CO_R0(co);
133	schorsch	2.9	} else if ((o->otype == OBJ_CONE) \| (o->otype == OBJ_CUP)) {
134	greg	1.1	co->sl = co->ca[7] - co->ca[6];
135			co->sl = sqrt(co->slco->sl + co->alco->al);
136	greg	2.2	} else { /* OBJ_CYLINDER or OBJ_TUBE */
137	greg	1.1	co->sl = co->al;
138			}
139			co->tm = NULL;
140	greg	1.2	o->os = (char *)co;
141	greg	1.1	}
142			if (getxf && co->tm == NULL)
143			conexform(co);
144			return(co);
145
146			argcerr:
147			objerror(o, USER, "bad # arguments");
148			raderr:
149	greg	2.10	objerror(o, WARNING, "illegal radii");
150			free(co);
151			return(NULL);
152	greg	1.1	}
153
154
155	greg	2.5	void
156	greg	2.10	freecone(OBJREC o) / free memory associated with cone */
157	greg	1.1	{
158	greg	2.10	CONE co = (CONE )o->os;
159	greg	1.1
160	greg	2.4	if (co == NULL)
161	greg	1.5	return;
162	greg	1.1	if (co->tm != NULL)
163	greg	2.5	free((void *)co->tm);
164			free((void *)co);
165	greg	1.1	o->os = NULL;
166			}
167
168
169	greg	2.5	void
170	greg	2.10	conexform(CONE co) / get cone transformation matrix */
171	greg	1.1	{
172	greg	1.6	MAT4 m4;
173	greg	2.10	double d;
174			int i;
175	greg	1.1
176	schorsch	2.8	co->tm = (RREAL (*)[4])malloc(sizeof(MAT4));
177	greg	1.1	if (co->tm == NULL)
178			error(SYSTEM, "out of memory in conexform");
179
180			/* translate to origin */
181			setident4(co->tm);
182			if (co->r0 == co->r1)
183			d = 0.0;
184			else
185	greg	2.2	d = CO_R0(co) / (CO_R1(co) - CO_R0(co));
186	greg	1.1	for (i = 0; i < 3; i++)
187	greg	2.2	co->tm[3][i] = d*(CO_P1(co)[i] - CO_P0(co)[i])
188			- CO_P0(co)[i];
189	greg	1.1
190			/* rotate to positive z-axis */
191			setident4(m4);
192			d = co->ad[1]co->ad[1] + co->ad[2]co->ad[2];
193			if (d <= FTINY*FTINY) {
194			m4[0][0] = 0.0;
195			m4[0][2] = co->ad[0];
196			m4[2][0] = -co->ad[0];
197			m4[2][2] = 0.0;
198			} else {
199			d = sqrt(d);
200			m4[0][0] = d;
201			m4[1][0] = -co->ad[0]*co->ad[1]/d;
202			m4[2][0] = -co->ad[0]*co->ad[2]/d;
203			m4[1][1] = co->ad[2]/d;
204			m4[2][1] = -co->ad[1]/d;
205			m4[0][2] = co->ad[0];
206			m4[1][2] = co->ad[1];
207			m4[2][2] = co->ad[2];
208			}
209			multmat4(co->tm, co->tm, m4);
210
211			/* scale z-axis */
212	schorsch	2.9	if ((co->p0 != co->p1) & (co->r0 != co->r1)) {
213	greg	2.2	setident4(m4);
214			m4[2][2] = (CO_R1(co) - CO_R0(co)) / co->al;
215			multmat4(co->tm, co->tm, m4);
216	greg	1.1	}
217			}