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)
#	Content
1	#ifndef lint
2	static const char RCSid[] = "$Id: cone.c,v 2.9 2003/07/27 22:12:01 schorsch Exp $";
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( /* get cone structure */
45	OBJREC *o,
46	int getxf
47	)
48	{
49	int sgn0, sgn1;
50	CONE *co;
51
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	if ((o->otype == OBJ_CYLINDER) \| (o->otype == OBJ_TUBE)) {
61	if (o->oargs.nfargs != 7)
62	goto argcerr;
63	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	goto raderr;
70	co->p0 = 0; co->p1 = 3;
71	co->r0 = co->r1 = 6;
72	} else {
73	if (o->oargs.nfargs != 8)
74	goto argcerr;
75	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	goto raderr;
83	if ((sgn0 < 0) \| (sgn1 < 0)) {
84	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	if (co->ca[7] - co->ca[6] > FTINY) {
92	if (o->otype == OBJ_RING)
93	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	goto raderr;
108	o->otype = o->otype == OBJ_CONE ?
109	OBJ_CYLINDER : OBJ_TUBE;
110	o->oargs.nfargs = 7;
111	co->p0 = 0; co->p1 = 3;
112	co->r0 = co->r1 = 6;
113	}
114	}
115	/* get axis orientation */
116	if (o->otype == OBJ_RING)
117	VCOPY(co->ad, o->oargs.farg+3);
118	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	}
123	co->al = normalize(co->ad);
124	if (co->al == 0.0) {
125	objerror(o, WARNING, "unknown orientation");
126	free(co);
127	return(NULL);
128	}
129	/* compute axis and side lengths */
130	if (o->otype == OBJ_RING) {
131	co->al = 0.0;
132	co->sl = CO_R1(co) - CO_R0(co);
133	} else if ((o->otype == OBJ_CONE) \| (o->otype == OBJ_CUP)) {
134	co->sl = co->ca[7] - co->ca[6];
135	co->sl = sqrt(co->slco->sl + co->alco->al);
136	} else { /* OBJ_CYLINDER or OBJ_TUBE */
137	co->sl = co->al;
138	}
139	co->tm = NULL;
140	o->os = (char *)co;
141	}
142	if (getxf && co->tm == NULL)
143	conexform(co);
144	return(co);
145
146	argcerr:
147	objerror(o, USER, "bad # arguments");
148	raderr:
149	objerror(o, WARNING, "illegal radii");
150	free(co);
151	return(NULL);
152	}
153
154
155	void
156	freecone(OBJREC o) / free memory associated with cone */
157	{
158	CONE co = (CONE )o->os;
159
160	if (co == NULL)
161	return;
162	if (co->tm != NULL)
163	free((void *)co->tm);
164	free((void *)co);
165	o->os = NULL;
166	}
167
168
169	void
170	conexform(CONE co) / get cone transformation matrix */
171	{
172	MAT4 m4;
173	double d;
174	int i;
175
176	co->tm = (RREAL (*)[4])malloc(sizeof(MAT4));
177	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	d = CO_R0(co) / (CO_R1(co) - CO_R0(co));
186	for (i = 0; i < 3; i++)
187	co->tm[3][i] = d*(CO_P1(co)[i] - CO_P0(co)[i])
188	- CO_P0(co)[i];
189
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	if ((co->p0 != co->p1) & (co->r0 != co->r1)) {
213	setident4(m4);
214	m4[2][2] = (CO_R1(co) - CO_R0(co)) / co->al;
215	multmat4(co->tm, co->tm, m4);
216	}
217	}