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/* Copyright (c) 1990 Regents of the University of California */
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#ifndef lint
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static char SCCSid[] = "$SunId$ LBL";
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#endif
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/*
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* xf.c - routines to convert transform arguments into 4X4 matrix.
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*
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* 1/28/86
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*/
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#include "standard.h"
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#define d2r(a) ((PI/180.)*(a))
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#define checkarg(a,n) if (av[i][a] || i+n >= ac) goto done
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int
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xf(ret, ac, av) /* get transform specification */
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register XF *ret;
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int ac;
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char *av[];
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{
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double atof(), sin(), cos();
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double xfmat[4][4], m4[4][4];
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double xfsca, dtmp;
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int i, icnt;
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setident4(ret->xfm);
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ret->sca = 1.0;
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icnt = 1;
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setident4(xfmat);
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xfsca = 1.0;
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for (i = 0; i < ac && av[i][0] == '-'; i++) {
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setident4(m4);
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switch (av[i][1]) {
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case 't': /* translate */
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checkarg(2,3);
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m4[3][0] = atof(av[++i]);
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m4[3][1] = atof(av[++i]);
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m4[3][2] = atof(av[++i]);
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break;
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case 'r': /* rotate */
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switch (av[i][2]) {
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case 'x':
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checkarg(3,1);
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dtmp = d2r(atof(av[++i]));
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m4[1][1] = m4[2][2] = cos(dtmp);
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m4[2][1] = -(m4[1][2] = sin(dtmp));
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break;
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case 'y':
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checkarg(3,1);
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dtmp = d2r(atof(av[++i]));
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m4[0][0] = m4[2][2] = cos(dtmp);
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m4[0][2] = -(m4[2][0] = sin(dtmp));
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break;
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case 'z':
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checkarg(3,1);
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dtmp = d2r(atof(av[++i]));
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m4[0][0] = m4[1][1] = cos(dtmp);
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m4[1][0] = -(m4[0][1] = sin(dtmp));
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break;
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default:
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return(i);
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}
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break;
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case 's': /* scale */
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checkarg(2,1);
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dtmp = atof(av[i+1]);
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if (dtmp == 0.0) goto done;
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i++;
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xfsca *=
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m4[0][0] =
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m4[1][1] =
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m4[2][2] = dtmp;
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break;
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case 'm': /* mirror */
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switch (av[i][2]) {
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case 'x':
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checkarg(3,0);
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xfsca *=
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m4[0][0] = -1.0;
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break;
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case 'y':
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checkarg(3,0);
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xfsca *=
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m4[1][1] = -1.0;
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break;
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case 'z':
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checkarg(3,0);
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xfsca *=
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m4[2][2] = -1.0;
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break;
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default:
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return(i);
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}
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break;
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case 'i': /* iterate */
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checkarg(2,1);
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while (icnt-- > 0) {
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multmat4(ret->xfm, ret->xfm, xfmat);
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ret->sca *= xfsca;
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}
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icnt = atoi(av[++i]);
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setident4(xfmat);
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xfsca = 1.0;
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continue;
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default:
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return(i);
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}
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multmat4(xfmat, xfmat, m4);
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}
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done:
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while (icnt-- > 0) {
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multmat4(ret->xfm, ret->xfm, xfmat);
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ret->sca *= xfsca;
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}
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return(i);
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}
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#ifdef INVXF
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int
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invxf(ret, ac, av) /* invert transform specification */
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register XF *ret;
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int ac;
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char *av[];
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{
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double atof(), sin(), cos();
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double xfmat[4][4], m4[4][4];
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double xfsca, dtmp;
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int i, icnt;
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setident4(ret->xfm);
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ret->sca = 1.0;
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icnt = 1;
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setident4(xfmat);
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xfsca = 1.0;
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for (i = 0; i < ac && av[i][0] == '-'; i++) {
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setident4(m4);
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switch (av[i][1]) {
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case 't': /* translate */
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checkarg(2,3);
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m4[3][0] = -atof(av[++i]);
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m4[3][1] = -atof(av[++i]);
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m4[3][2] = -atof(av[++i]);
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break;
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case 'r': /* rotate */
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switch (av[i][2]) {
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case 'x':
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checkarg(3,1);
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dtmp = -d2r(atof(av[++i]));
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m4[1][1] = m4[2][2] = cos(dtmp);
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m4[2][1] = -(m4[1][2] = sin(dtmp));
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break;
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case 'y':
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checkarg(3,1);
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dtmp = -d2r(atof(av[++i]));
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m4[0][0] = m4[2][2] = cos(dtmp);
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m4[0][2] = -(m4[2][0] = sin(dtmp));
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break;
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case 'z':
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checkarg(3,1);
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dtmp = -d2r(atof(av[++i]));
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m4[0][0] = m4[1][1] = cos(dtmp);
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m4[1][0] = -(m4[0][1] = sin(dtmp));
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break;
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default:
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return(i);
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}
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break;
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case 's': /* scale */
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checkarg(2,1);
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dtmp = atof(av[i+1]);
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if (dtmp == 0.0) goto done;
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i++;
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xfsca *=
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m4[0][0] =
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m4[1][1] =
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m4[2][2] = 1.0 / dtmp;
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break;
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case 'm': /* mirror */
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switch (av[i][2]) {
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case 'x':
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checkarg(3,0);
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xfsca *=
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m4[0][0] = -1.0;
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break;
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case 'y':
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checkarg(3,0);
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xfsca *=
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m4[1][1] = -1.0;
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break;
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case 'z':
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checkarg(3,0);
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xfsca *=
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m4[2][2] = -1.0;
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break;
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default:
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return(i);
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}
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break;
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case 'i': /* iterate */
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checkarg(2,1);
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while (icnt-- > 0) {
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multmat4(ret->xfm, xfmat, ret->xfm);
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ret->sca *= xfsca;
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}
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icnt = atoi(av[++i]);
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setident4(xfmat);
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xfsca = 1.0;
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break;
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default:
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return(i);
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}
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multmat4(xfmat, m4, xfmat); /* left multiply */
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}
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done:
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while (icnt-- > 0) {
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multmat4(ret->xfm, xfmat, ret->xfm);
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ret->sca *= xfsca;
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}
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return(i);
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}
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int
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fullxf(fx, ac, av) /* compute both forward and inverse */
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FULLXF *fx;
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int ac;
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char *av[];
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{
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xf(&fx->f, ac, av);
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return(invxf(&fx->b, ac, av));
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}
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#endif
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