src/gen/genrev.c

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

/* Copyright (c) 1989 Regents of the University of California */

/*
 *  genrev.c - program to generate functions of rotation about z
 *
 *      The program takes as input the functions of t for z and r
 *      (the radius).  If z is increasing, the normal points
 *      outward, inward for decreasing z.  Negative radii are forbidden.
 *
 *      8/6/86
 */

#include  <stdio.h>
#include  <math.h>

#define  ZNAME          "Z`SYS`"                /* z function name */
#define  RNAME          "R`SYS`"                /* r function name */

#define  PI             3.14159265358979323846

#define  FTINY          1e-9
                                        /* orientation */
#define  OUT            01
#define  IN             02
#define  UP             04
#define  DOWN           010

double  funvalue(), l_hermite(), l_bezier(), l_bspline(), argument();


main(argc, argv)
int  argc;
char  *argv[];
{
        extern long     eclock;
        char  stmp[256];
        char  *modname;
        int  smooth = 0;
        double  t, lastz, z, nextz, lastr, r, nextr;
        double  lastnz, lastnr, nz, nr, nextnz, nextnr;
        int  i, nseg;
        int  orient;

        varset("PI", ':', PI);
        funset("hermite", 5, ':', l_hermite);
        funset("bezier", 5, ':', l_bezier);
        funset("bspline", 5, ':', l_bspline);

        if (argc < 6)
                goto userror;

        for (i = 6; i < argc; i++)
                if (!strcmp(argv[i], "-e"))
                        scompile(argv[++i], NULL, 0);
                else if (!strcmp(argv[i], "-f"))
                        fcompile(argv[++i]);
                else if (!strcmp(argv[i], "-s"))
                        smooth = 1;
                else
                        goto userror;

        sprintf(stmp, "%s(t)=%s;", ZNAME, argv[3]);
        scompile(stmp, NULL, 0);
        sprintf(stmp, "%s(t)=%s;", RNAME, argv[4]);
        scompile(stmp, NULL, 0);
        nseg = atoi(argv[5]);
        if (nseg <= 0)
                goto userror;
        modname = smooth ? "Phong" : argv[1];

        printhead(argc, argv);
        eclock = 0;

        lastnz = lastnr = 0.0;
        t = 0.0;
        lastz = funvalue(ZNAME, 1, &t);
        lastr = funvalue(RNAME, 1, &t);
        t = 1.0/nseg;
        z = funvalue(ZNAME, 1, &t);
        r = funvalue(RNAME, 1, &t);
        computen(&nz, &nr, lastz, lastr, z, r);
        for (i = 1; i <= nseg; i++) {
                if (i < nseg) {
                        t = (double)(i+1)/nseg;
                        nextz = funvalue(ZNAME, 1, &t);
                        nextr = funvalue(RNAME, 1, &t);
                        computen(&nextnz, &nextnr, z, r, nextz, nextr);
                } else
                        nextnz = nextnr = 0.0;
                orient = 0;
                if (z < lastz-FTINY)
                        orient |= DOWN;
                else if (z > lastz+FTINY)
                        orient |= UP;
                if (r < lastr-FTINY)
                        orient |= IN;
                else if (r > lastr+FTINY)
                        orient |= OUT;
                if (!orient)
                        goto endfor;
                if (smooth) {
                        printf("\n%s texfunc Phong\n", argv[1]);
                        printf("4 rev_dx rev_dy rev_dz rev.cal\n");
                        printf("0\n4\n");
                        if (orient&(UP|DOWN)) {
                                t = (nextnz - lastnz)/(z - lastz);
                                printf("\t%15.9g\t%15.9g\n",
                                                t, lastnz - t*lastz);
                        } else
                                printf("\t0\t%d\n", orient&IN ? 1 : -1);
                        if (orient&(OUT|IN))  {
                                t = (nextnr - lastnr)/(r - lastr);
                                printf("\t%15.9g\t%15.9g\n",
                                                t, lastnr - t*lastr);
                        } else
                                printf("\t0\t%d\n", orient&UP ? 1 : -1);
                }
                if (!(orient&(IN|OUT))) {
                        printf("\n%s %s %s.%d\n", modname,
                                        orient&DOWN ? "tube" : "cylinder",
                                        argv[2], i);
                        printf("0\n0\n7\n");
                        printf("\t0\t0\t%15.9g\n", lastz);
                        printf("\t0\t0\t%15.9g\n", z);
                        printf("\t%15.9g\n", r);
                } else if (!(orient&(UP|DOWN))) {
                        printf("\n%s ring %s.%d\n", modname, argv[2], i);
                        printf("0\n0\n8\n");
                        printf("\t0\t0\t%15.9g\n", z);
                        printf("\t0\t0\t%15.9g\n", orient&IN ? 1.0 : -1.0);
                        printf("\t%15.9g\t%15.9g\n", lastr, r);
                } else {
                        printf("\n%s %s %s.%d\n", modname,
                                        orient&DOWN ? "cup" : "cone",
                                        argv[2], i);
                        printf("0\n0\n8\n");
                        printf("\t0\t0\t%15.9g\n", lastz);
                        printf("\t0\t0\t%15.9g\n", z);
                        printf("\t%15.9g\t%15.9g\n", lastr, r);
                }
        endfor:
                lastz = z; lastr = r;
                z = nextz; r = nextr;
                lastnz = nz; lastnr = nr;
                nz = nextnz; nr = nextnr;
        }
        quit(0);

userror:
        fprintf(stderr,
        "Usage: %s material name z(t) r(t) nseg [-e expr] [-f file] [-s]\n",
                        argv[0]);
        quit(1);
}


computen(nzp, nrp, z0, r0, z1, r1)              /* compute normal */
double  *nzp, *nrp, z0, r0, z1, r1;
{
        double  dr, dz, len;

        dz = r0 - r1;                           /* right angle vector */
        dr = z1 - z0;
        len = sqrt(dr*dr + dz*dz);
        *nzp = dz/len;
        *nrp = dr/len;
}


eputs(msg)
char  *msg;
{
        fputs(msg, stderr);
}


wputs(msg)
char  *msg;
{
        eputs(msg);
}


quit(code)
int  code;
{
        exit(code);
}


printhead(ac, av)               /* print command header */
register int  ac;
register char  **av;
{
        putchar('#');
        while (ac--) {
                putchar(' ');
                fputs(*av++, stdout);
        }
        putchar('\n');
}


double
l_hermite()                     
{
        double  t;
        
        t = argument(5);
        return( argument(1)*((2.0*t-3.0)*t*t+1.0) +
                argument(2)*(-2.0*t+3.0)*t*t +
                argument(3)*((t-2.0)*t+1.0)*t +
                argument(4)*(t-1.0)*t*t );
}


double
l_bezier()
{
        double  t;

        t = argument(5);
        return( argument(1) * (1.+t*(-3.+t*(3.-t))) +
                argument(2) * 3.*t*(1.+t*(-2.+t)) +
                argument(3) * 3.*t*t*(1.-t) +
                argument(4) * t*t*t );
}


double
l_bspline()
{
        double  t;

        t = argument(5);
        return( argument(1) * (1./6.+t*(-1./2.+t*(1./2.-1./6.*t))) +
                argument(2) * (2./3.+t*t*(-1.+1./2.*t)) +
                argument(3) * (1./6.+t*(1./2.+t*(1./2.-1./2.*t))) +
                argument(4) * (1./6.*t*t*t) );
}
Revision:	2.3
Committed:	Thu Nov 18 09:33:01 1993 UTC (31 years, 11 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.2:	+1 -0 lines
Log Message:	minor compiler warning fixes
#	User	Rev	Content
1	greg	1.1	#ifndef lint
2			static char SCCSid[] = "$SunId$ LBL";
3			#endif
4	greg	1.2
5	greg	1.5	/* Copyright (c) 1989 Regents of the University of California */
6
7	greg	1.2	/*
8	greg	1.1	* genrev.c - program to generate functions of rotation about z
9			*
10			* The program takes as input the functions of t for z and r
11			* (the radius). If z is increasing, the normal points
12			* outward, inward for decreasing z. Negative radii are forbidden.
13			*
14			* 8/6/86
15			*/
16
17			#include <stdio.h>
18	greg	2.2	#include <math.h>
19	greg	1.1
20	greg	1.10	#define ZNAME "Z`SYS`" /* z function name */
21			#define RNAME "R`SYS`" /* r function name */
22	greg	1.1
23			#define PI 3.14159265358979323846
24
25			#define FTINY 1e-9
26			/* orientation */
27			#define OUT 01
28			#define IN 02
29			#define UP 04
30			#define DOWN 010
31
32	greg	1.5	double funvalue(), l_hermite(), l_bezier(), l_bspline(), argument();
33	greg	1.1
34
35			main(argc, argv)
36			int argc;
37			char *argv[];
38			{
39	greg	1.6	extern long eclock;
40	greg	1.1	char stmp[256];
41			char *modname;
42			int smooth = 0;
43			double t, lastz, z, nextz, lastr, r, nextr;
44			double lastnz, lastnr, nz, nr, nextnz, nextnr;
45			int i, nseg;
46			int orient;
47
48	greg	1.8	varset("PI", ':', PI);
49	greg	1.9	funset("hermite", 5, ':', l_hermite);
50			funset("bezier", 5, ':', l_bezier);
51			funset("bspline", 5, ':', l_bspline);
52	greg	1.1
53			if (argc < 6)
54			goto userror;
55
56			for (i = 6; i < argc; i++)
57			if (!strcmp(argv[i], "-e"))
58	greg	1.7	scompile(argv[++i], NULL, 0);
59	greg	1.1	else if (!strcmp(argv[i], "-f"))
60			fcompile(argv[++i]);
61			else if (!strcmp(argv[i], "-s"))
62			smooth = 1;
63			else
64			goto userror;
65
66			sprintf(stmp, "%s(t)=%s;", ZNAME, argv[3]);
67	greg	1.7	scompile(stmp, NULL, 0);
68	greg	1.1	sprintf(stmp, "%s(t)=%s;", RNAME, argv[4]);
69	greg	1.7	scompile(stmp, NULL, 0);
70	greg	1.1	nseg = atoi(argv[5]);
71			if (nseg <= 0)
72			goto userror;
73	greg	1.3	modname = smooth ? "Phong" : argv[1];
74	greg	1.1
75			printhead(argc, argv);
76	greg	1.6	eclock = 0;
77	greg	1.1
78			lastnz = lastnr = 0.0;
79			t = 0.0;
80			lastz = funvalue(ZNAME, 1, &t);
81			lastr = funvalue(RNAME, 1, &t);
82			t = 1.0/nseg;
83			z = funvalue(ZNAME, 1, &t);
84			r = funvalue(RNAME, 1, &t);
85			computen(&nz, &nr, lastz, lastr, z, r);
86			for (i = 1; i <= nseg; i++) {
87			if (i < nseg) {
88			t = (double)(i+1)/nseg;
89			nextz = funvalue(ZNAME, 1, &t);
90			nextr = funvalue(RNAME, 1, &t);
91			computen(&nextnz, &nextnr, z, r, nextz, nextr);
92			} else
93			nextnz = nextnr = 0.0;
94			orient = 0;
95			if (z < lastz-FTINY)
96			orient \|= DOWN;
97			else if (z > lastz+FTINY)
98			orient \|= UP;
99			if (r < lastr-FTINY)
100			orient \|= IN;
101			else if (r > lastr+FTINY)
102			orient \|= OUT;
103			if (!orient)
104			goto endfor;
105			if (smooth) {
106	greg	1.3	printf("\n%s texfunc Phong\n", argv[1]);
107	greg	1.1	printf("4 rev_dx rev_dy rev_dz rev.cal\n");
108			printf("0\n4\n");
109			if (orient&(UP\|DOWN)) {
110			t = (nextnz - lastnz)/(z - lastz);
111			printf("\t%15.9g\t%15.9g\n",
112			t, lastnz - t*lastz);
113			} else
114			printf("\t0\t%d\n", orient&IN ? 1 : -1);
115			if (orient&(OUT\|IN)) {
116			t = (nextnr - lastnr)/(r - lastr);
117			printf("\t%15.9g\t%15.9g\n",
118			t, lastnr - t*lastr);
119			} else
120			printf("\t0\t%d\n", orient&UP ? 1 : -1);
121			}
122			if (!(orient&(IN\|OUT))) {
123			printf("\n%s %s %s.%d\n", modname,
124			orient&DOWN ? "tube" : "cylinder",
125			argv[2], i);
126			printf("0\n0\n7\n");
127			printf("\t0\t0\t%15.9g\n", lastz);
128			printf("\t0\t0\t%15.9g\n", z);
129			printf("\t%15.9g\n", r);
130			} else if (!(orient&(UP\|DOWN))) {
131			printf("\n%s ring %s.%d\n", modname, argv[2], i);
132			printf("0\n0\n8\n");
133			printf("\t0\t0\t%15.9g\n", z);
134			printf("\t0\t0\t%15.9g\n", orient&IN ? 1.0 : -1.0);
135			printf("\t%15.9g\t%15.9g\n", lastr, r);
136			} else {
137			printf("\n%s %s %s.%d\n", modname,
138			orient&DOWN ? "cup" : "cone",
139			argv[2], i);
140			printf("0\n0\n8\n");
141			printf("\t0\t0\t%15.9g\n", lastz);
142			printf("\t0\t0\t%15.9g\n", z);
143			printf("\t%15.9g\t%15.9g\n", lastr, r);
144			}
145			endfor:
146			lastz = z; lastr = r;
147			z = nextz; r = nextr;
148			lastnz = nz; lastnr = nr;
149			nz = nextnz; nr = nextnr;
150			}
151			quit(0);
152
153			userror:
154			fprintf(stderr,
155			"Usage: %s material name z(t) r(t) nseg [-e expr] [-f file] [-s]\n",
156			argv[0]);
157			quit(1);
158			}
159
160
161			computen(nzp, nrp, z0, r0, z1, r1) /* compute normal */
162			double nzp, nrp, z0, r0, z1, r1;
163			{
164			double dr, dz, len;
165
166			dz = r0 - r1; /* right angle vector */
167			dr = z1 - z0;
168			len = sqrt(drdr + dzdz);
169			*nzp = dz/len;
170			*nrp = dr/len;
171			}
172
173
174			eputs(msg)
175			char *msg;
176			{
177			fputs(msg, stderr);
178			}
179
180
181			wputs(msg)
182			char *msg;
183			{
184			eputs(msg);
185			}
186
187
188			quit(code)
189	greg	2.3	int code;
190	greg	1.1	{
191			exit(code);
192			}
193
194
195			printhead(ac, av) /* print command header */
196			register int ac;
197			register char **av;
198			{
199			putchar('#');
200			while (ac--) {
201			putchar(' ');
202			fputs(*av++, stdout);
203			}
204			putchar('\n');
205			}
206
207
208			double
209			l_hermite()
210			{
211			double t;
212
213			t = argument(5);
214			return( argument(1)((2.0t-3.0)tt+1.0) +
215			argument(2)(-2.0t+3.0)tt +
216			argument(3)((t-2.0)t+1.0)*t +
217			argument(4)(t-1.0)t*t );
218	greg	1.4	}
219
220
221			double
222			l_bezier()
223			{
224			double t;
225
226			t = argument(5);
227			return( argument(1) * (1.+t(-3.+t(3.-t))) +
228			argument(2) * 3.t(1.+t*(-2.+t)) +
229			argument(3) * 3.tt*(1.-t) +
230			argument(4) * ttt );
231	greg	1.5	}
232
233
234			double
235			l_bspline()
236			{
237			double t;
238
239			t = argument(5);
240			return( argument(1) * (1./6.+t(-1./2.+t(1./2.-1./6.*t))) +
241			argument(2) * (2./3.+tt(-1.+1./2.*t)) +
242			argument(3) * (1./6.+t(1./2.+t(1./2.-1./2.*t))) +
243			argument(4) * (1./6.tt*t) );
244	greg	1.1	}