src/gen/genrev.c

#ifndef lint
static const char       RCSid[] = "$Id: genrev.c,v 2.5 2003/06/08 12:03:09 schorsch Exp $";
#endif
/*
 *  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  <stdlib.h>
#include  <stdio.h>
#include  <string.h>
#include  <math.h>
#include  "calcomp.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

void    quit(), eputs(), wputs();


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;
}


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


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


void
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(char *nm)
{
        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(char *nm)
{
        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(char *nm)
{
        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) );
}


main(argc, argv)
int  argc;
char  *argv[];
{
        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);
}


Revision:	2.6
Committed:	Mon Aug 4 22:37:53 2003 UTC (20 years, 8 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.5:	+5 -7 lines
Log Message:	Added prototype for LIBR function pointer in calcomp.h
#	User	Rev	Content
1	greg	1.1	#ifndef lint
2	greg	2.6	static const char RCSid[] = "$Id: genrev.c,v 2.5 2003/06/08 12:03:09 schorsch Exp $";
3	greg	1.1	#endif
4	greg	1.2	/*
5	greg	1.1	* genrev.c - program to generate functions of rotation about z
6			*
7			* The program takes as input the functions of t for z and r
8			* (the radius). If z is increasing, the normal points
9			* outward, inward for decreasing z. Negative radii are forbidden.
10			*
11			* 8/6/86
12			*/
13
14	schorsch	2.5	#include <stdlib.h>
15	greg	1.1	#include <stdio.h>
16	schorsch	2.5	#include <string.h>
17	greg	2.2	#include <math.h>
18	greg	2.6	#include "calcomp.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	2.4	void quit(), eputs(), wputs();
33
34	greg	1.1
35	schorsch	2.5	computen(nzp, nrp, z0, r0, z1, r1) /* compute normal */
36			double nzp, nrp, z0, r0, z1, r1;
37			{
38			double dr, dz, len;
39
40			dz = r0 - r1; /* right angle vector */
41			dr = z1 - z0;
42			len = sqrt(drdr + dzdz);
43			*nzp = dz/len;
44			*nrp = dr/len;
45			}
46
47
48			void
49			eputs(msg)
50			char *msg;
51			{
52			fputs(msg, stderr);
53			}
54
55
56			void
57			wputs(msg)
58			char *msg;
59			{
60			eputs(msg);
61			}
62
63
64			void
65			quit(code)
66			int code;
67			{
68			exit(code);
69			}
70
71
72			printhead(ac, av) /* print command header */
73			register int ac;
74			register char **av;
75			{
76			putchar('#');
77			while (ac--) {
78			putchar(' ');
79			fputs(*av++, stdout);
80			}
81			putchar('\n');
82			}
83
84
85			double
86	greg	2.6	l_hermite(char *nm)
87	schorsch	2.5	{
88			double t;
89
90			t = argument(5);
91			return( argument(1)((2.0t-3.0)tt+1.0) +
92			argument(2)(-2.0t+3.0)tt +
93			argument(3)((t-2.0)t+1.0)*t +
94			argument(4)(t-1.0)t*t );
95			}
96
97
98			double
99	greg	2.6	l_bezier(char *nm)
100	schorsch	2.5	{
101			double t;
102
103			t = argument(5);
104			return( argument(1) * (1.+t(-3.+t(3.-t))) +
105			argument(2) * 3.t(1.+t*(-2.+t)) +
106			argument(3) * 3.tt*(1.-t) +
107			argument(4) * ttt );
108			}
109
110
111			double
112	greg	2.6	l_bspline(char *nm)
113	schorsch	2.5	{
114			double t;
115
116			t = argument(5);
117			return( argument(1) * (1./6.+t(-1./2.+t(1./2.-1./6.*t))) +
118			argument(2) * (2./3.+tt(-1.+1./2.*t)) +
119			argument(3) * (1./6.+t(1./2.+t(1./2.-1./2.*t))) +
120			argument(4) * (1./6.tt*t) );
121			}
122
123
124	greg	1.1	main(argc, argv)
125			int argc;
126			char *argv[];
127			{
128			char stmp[256];
129			char *modname;
130			int smooth = 0;
131			double t, lastz, z, nextz, lastr, r, nextr;
132			double lastnz, lastnr, nz, nr, nextnz, nextnr;
133			int i, nseg;
134			int orient;
135
136	greg	1.8	varset("PI", ':', PI);
137	greg	1.9	funset("hermite", 5, ':', l_hermite);
138			funset("bezier", 5, ':', l_bezier);
139			funset("bspline", 5, ':', l_bspline);
140	greg	1.1
141			if (argc < 6)
142			goto userror;
143
144			for (i = 6; i < argc; i++)
145			if (!strcmp(argv[i], "-e"))
146	greg	1.7	scompile(argv[++i], NULL, 0);
147	greg	1.1	else if (!strcmp(argv[i], "-f"))
148			fcompile(argv[++i]);
149			else if (!strcmp(argv[i], "-s"))
150			smooth = 1;
151			else
152			goto userror;
153
154			sprintf(stmp, "%s(t)=%s;", ZNAME, argv[3]);
155	greg	1.7	scompile(stmp, NULL, 0);
156	greg	1.1	sprintf(stmp, "%s(t)=%s;", RNAME, argv[4]);
157	greg	1.7	scompile(stmp, NULL, 0);
158	greg	1.1	nseg = atoi(argv[5]);
159			if (nseg <= 0)
160			goto userror;
161	greg	1.3	modname = smooth ? "Phong" : argv[1];
162	greg	1.1
163			printhead(argc, argv);
164	greg	1.6	eclock = 0;
165	greg	1.1
166			lastnz = lastnr = 0.0;
167			t = 0.0;
168			lastz = funvalue(ZNAME, 1, &t);
169			lastr = funvalue(RNAME, 1, &t);
170			t = 1.0/nseg;
171			z = funvalue(ZNAME, 1, &t);
172			r = funvalue(RNAME, 1, &t);
173			computen(&nz, &nr, lastz, lastr, z, r);
174			for (i = 1; i <= nseg; i++) {
175			if (i < nseg) {
176			t = (double)(i+1)/nseg;
177			nextz = funvalue(ZNAME, 1, &t);
178			nextr = funvalue(RNAME, 1, &t);
179			computen(&nextnz, &nextnr, z, r, nextz, nextr);
180			} else
181			nextnz = nextnr = 0.0;
182			orient = 0;
183			if (z < lastz-FTINY)
184			orient \|= DOWN;
185			else if (z > lastz+FTINY)
186			orient \|= UP;
187			if (r < lastr-FTINY)
188			orient \|= IN;
189			else if (r > lastr+FTINY)
190			orient \|= OUT;
191			if (!orient)
192			goto endfor;
193			if (smooth) {
194	greg	1.3	printf("\n%s texfunc Phong\n", argv[1]);
195	greg	1.1	printf("4 rev_dx rev_dy rev_dz rev.cal\n");
196			printf("0\n4\n");
197			if (orient&(UP\|DOWN)) {
198			t = (nextnz - lastnz)/(z - lastz);
199			printf("\t%15.9g\t%15.9g\n",
200			t, lastnz - t*lastz);
201			} else
202			printf("\t0\t%d\n", orient&IN ? 1 : -1);
203			if (orient&(OUT\|IN)) {
204			t = (nextnr - lastnr)/(r - lastr);
205			printf("\t%15.9g\t%15.9g\n",
206			t, lastnr - t*lastr);
207			} else
208			printf("\t0\t%d\n", orient&UP ? 1 : -1);
209			}
210			if (!(orient&(IN\|OUT))) {
211			printf("\n%s %s %s.%d\n", modname,
212			orient&DOWN ? "tube" : "cylinder",
213			argv[2], i);
214			printf("0\n0\n7\n");
215			printf("\t0\t0\t%15.9g\n", lastz);
216			printf("\t0\t0\t%15.9g\n", z);
217			printf("\t%15.9g\n", r);
218			} else if (!(orient&(UP\|DOWN))) {
219			printf("\n%s ring %s.%d\n", modname, argv[2], i);
220			printf("0\n0\n8\n");
221			printf("\t0\t0\t%15.9g\n", z);
222			printf("\t0\t0\t%15.9g\n", orient&IN ? 1.0 : -1.0);
223			printf("\t%15.9g\t%15.9g\n", lastr, r);
224			} else {
225			printf("\n%s %s %s.%d\n", modname,
226			orient&DOWN ? "cup" : "cone",
227			argv[2], i);
228			printf("0\n0\n8\n");
229			printf("\t0\t0\t%15.9g\n", lastz);
230			printf("\t0\t0\t%15.9g\n", z);
231			printf("\t%15.9g\t%15.9g\n", lastr, r);
232			}
233			endfor:
234			lastz = z; lastr = r;
235			z = nextz; r = nextr;
236			lastnz = nz; lastnr = nr;
237			nz = nextnz; nr = nextnr;
238			}
239			quit(0);
240
241			userror:
242			fprintf(stderr,
243			"Usage: %s material name z(t) r(t) nseg [-e expr] [-f file] [-s]\n",
244			argv[0]);
245			quit(1);
246			}
247
248