src/gen/genrev.c

#ifndef lint
static const char       RCSid[] = "$Id: genrev.c,v 2.6 2003/08/04 22:37:53 greg 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  "rterror.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
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);
}


void
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) );
}


int
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;
        }
        return 0;

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


Revision:	2.7
Committed:	Sun Nov 16 10:29:38 2003 UTC (20 years, 5 months ago) by schorsch
Content type:	text/plain
Branch:	MAIN
Changes since 2.6:	+8 -5 lines
Log Message:	Continued ANSIfication and reduced other compile warnings.
#	User	Rev	Content
1	greg	1.1	#ifndef lint
2	schorsch	2.7	static const char RCSid[] = "$Id: genrev.c,v 2.6 2003/08/04 22:37:53 greg 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	schorsch	2.7
19			#include "rterror.h"
20	greg	2.6	#include "calcomp.h"
21	greg	1.1
22	greg	1.10	#define ZNAME "Z`SYS`" /* z function name */
23			#define RNAME "R`SYS`" /* r function name */
24	greg	1.1
25			#define PI 3.14159265358979323846
26
27			#define FTINY 1e-9
28			/* orientation */
29			#define OUT 01
30			#define IN 02
31			#define UP 04
32			#define DOWN 010
33
34
35	schorsch	2.7	void
36	schorsch	2.5	computen(nzp, nrp, z0, r0, z1, r1) /* compute normal */
37			double nzp, nrp, z0, r0, z1, r1;
38			{
39			double dr, dz, len;
40
41			dz = r0 - r1; /* right angle vector */
42			dr = z1 - z0;
43			len = sqrt(drdr + dzdz);
44			*nzp = dz/len;
45			*nrp = dr/len;
46			}
47
48
49			void
50			eputs(msg)
51			char *msg;
52			{
53			fputs(msg, stderr);
54			}
55
56
57			void
58			wputs(msg)
59			char *msg;
60			{
61			eputs(msg);
62			}
63
64
65			void
66			quit(code)
67			int code;
68			{
69			exit(code);
70			}
71
72
73	schorsch	2.7	void
74	schorsch	2.5	printhead(ac, av) /* print command header */
75			register int ac;
76			register char **av;
77			{
78			putchar('#');
79			while (ac--) {
80			putchar(' ');
81			fputs(*av++, stdout);
82			}
83			putchar('\n');
84			}
85
86
87			double
88	greg	2.6	l_hermite(char *nm)
89	schorsch	2.5	{
90			double t;
91
92			t = argument(5);
93			return( argument(1)((2.0t-3.0)tt+1.0) +
94			argument(2)(-2.0t+3.0)tt +
95			argument(3)((t-2.0)t+1.0)*t +
96			argument(4)(t-1.0)t*t );
97			}
98
99
100			double
101	greg	2.6	l_bezier(char *nm)
102	schorsch	2.5	{
103			double t;
104
105			t = argument(5);
106			return( argument(1) * (1.+t(-3.+t(3.-t))) +
107			argument(2) * 3.t(1.+t*(-2.+t)) +
108			argument(3) * 3.tt*(1.-t) +
109			argument(4) * ttt );
110			}
111
112
113			double
114	greg	2.6	l_bspline(char *nm)
115	schorsch	2.5	{
116			double t;
117
118			t = argument(5);
119			return( argument(1) * (1./6.+t(-1./2.+t(1./2.-1./6.*t))) +
120			argument(2) * (2./3.+tt(-1.+1./2.*t)) +
121			argument(3) * (1./6.+t(1./2.+t(1./2.-1./2.*t))) +
122			argument(4) * (1./6.tt*t) );
123			}
124
125
126	schorsch	2.7	int
127	greg	1.1	main(argc, argv)
128			int argc;
129			char *argv[];
130			{
131			char stmp[256];
132			char *modname;
133			int smooth = 0;
134			double t, lastz, z, nextz, lastr, r, nextr;
135			double lastnz, lastnr, nz, nr, nextnz, nextnr;
136			int i, nseg;
137			int orient;
138
139	greg	1.8	varset("PI", ':', PI);
140	greg	1.9	funset("hermite", 5, ':', l_hermite);
141			funset("bezier", 5, ':', l_bezier);
142			funset("bspline", 5, ':', l_bspline);
143	greg	1.1
144			if (argc < 6)
145			goto userror;
146
147			for (i = 6; i < argc; i++)
148			if (!strcmp(argv[i], "-e"))
149	greg	1.7	scompile(argv[++i], NULL, 0);
150	greg	1.1	else if (!strcmp(argv[i], "-f"))
151			fcompile(argv[++i]);
152			else if (!strcmp(argv[i], "-s"))
153			smooth = 1;
154			else
155			goto userror;
156
157			sprintf(stmp, "%s(t)=%s;", ZNAME, argv[3]);
158	greg	1.7	scompile(stmp, NULL, 0);
159	greg	1.1	sprintf(stmp, "%s(t)=%s;", RNAME, argv[4]);
160	greg	1.7	scompile(stmp, NULL, 0);
161	greg	1.1	nseg = atoi(argv[5]);
162			if (nseg <= 0)
163			goto userror;
164	greg	1.3	modname = smooth ? "Phong" : argv[1];
165	greg	1.1
166			printhead(argc, argv);
167	greg	1.6	eclock = 0;
168	greg	1.1
169			lastnz = lastnr = 0.0;
170			t = 0.0;
171			lastz = funvalue(ZNAME, 1, &t);
172			lastr = funvalue(RNAME, 1, &t);
173			t = 1.0/nseg;
174			z = funvalue(ZNAME, 1, &t);
175			r = funvalue(RNAME, 1, &t);
176			computen(&nz, &nr, lastz, lastr, z, r);
177			for (i = 1; i <= nseg; i++) {
178			if (i < nseg) {
179			t = (double)(i+1)/nseg;
180			nextz = funvalue(ZNAME, 1, &t);
181			nextr = funvalue(RNAME, 1, &t);
182			computen(&nextnz, &nextnr, z, r, nextz, nextr);
183			} else
184			nextnz = nextnr = 0.0;
185			orient = 0;
186			if (z < lastz-FTINY)
187			orient \|= DOWN;
188			else if (z > lastz+FTINY)
189			orient \|= UP;
190			if (r < lastr-FTINY)
191			orient \|= IN;
192			else if (r > lastr+FTINY)
193			orient \|= OUT;
194			if (!orient)
195			goto endfor;
196			if (smooth) {
197	greg	1.3	printf("\n%s texfunc Phong\n", argv[1]);
198	greg	1.1	printf("4 rev_dx rev_dy rev_dz rev.cal\n");
199			printf("0\n4\n");
200			if (orient&(UP\|DOWN)) {
201			t = (nextnz - lastnz)/(z - lastz);
202			printf("\t%15.9g\t%15.9g\n",
203			t, lastnz - t*lastz);
204			} else
205			printf("\t0\t%d\n", orient&IN ? 1 : -1);
206			if (orient&(OUT\|IN)) {
207			t = (nextnr - lastnr)/(r - lastr);
208			printf("\t%15.9g\t%15.9g\n",
209			t, lastnr - t*lastr);
210			} else
211			printf("\t0\t%d\n", orient&UP ? 1 : -1);
212			}
213			if (!(orient&(IN\|OUT))) {
214			printf("\n%s %s %s.%d\n", modname,
215			orient&DOWN ? "tube" : "cylinder",
216			argv[2], i);
217			printf("0\n0\n7\n");
218			printf("\t0\t0\t%15.9g\n", lastz);
219			printf("\t0\t0\t%15.9g\n", z);
220			printf("\t%15.9g\n", r);
221			} else if (!(orient&(UP\|DOWN))) {
222			printf("\n%s ring %s.%d\n", modname, argv[2], i);
223			printf("0\n0\n8\n");
224			printf("\t0\t0\t%15.9g\n", z);
225			printf("\t0\t0\t%15.9g\n", orient&IN ? 1.0 : -1.0);
226			printf("\t%15.9g\t%15.9g\n", lastr, r);
227			} else {
228			printf("\n%s %s %s.%d\n", modname,
229			orient&DOWN ? "cup" : "cone",
230			argv[2], i);
231			printf("0\n0\n8\n");
232			printf("\t0\t0\t%15.9g\n", lastz);
233			printf("\t0\t0\t%15.9g\n", z);
234			printf("\t%15.9g\t%15.9g\n", lastr, r);
235			}
236			endfor:
237			lastz = z; lastr = r;
238			z = nextz; r = nextr;
239			lastnz = nz; lastnr = nr;
240			nz = nextnz; nr = nextnr;
241			}
242	schorsch	2.7	return 0;
243	greg	1.1
244			userror:
245			fprintf(stderr,
246			"Usage: %s material name z(t) r(t) nseg [-e expr] [-f file] [-s]\n",
247			argv[0]);
248	schorsch	2.7	return 1;
249	greg	1.1	}
250
251