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/* Copyright (c) 1986 Regents of the University of California */ |
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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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* 1/28/86 |
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*/ |
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#include "standard.h" |
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#define PI 3.14159265358979323846 |
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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(retmat, retsca, ac, av) /* get transform specification */ |
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double retmat[4][4]; |
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double *retsca; |
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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 xfsca, dtmp; |
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int i, icnt; |
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setident4(retmat); |
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*retsca = 1.0; |
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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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case 'i': /* iterate */ |
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checkarg(2,1); |
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icnt = atoi(av[++i]); |
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while (icnt-- > 0) { |
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multmat4(retmat, retmat, xfmat); |
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*retsca *= xfsca; |
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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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break; |
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continue; |
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default: |
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return(i); |
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multmat4(xfmat, xfmat, m4); |
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} |
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done: |
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multmat4(retmat, retmat, xfmat); |
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*retsca *= xfsca; |
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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(retmat, retsca, ac, av) /* invert transform specification */ |
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double retmat[4][4]; |
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double *retsca; |
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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 xfsca, dtmp; |
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int i, icnt; |
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setident4(retmat); |
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*retsca = 1.0; |
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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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case 'i': /* iterate */ |
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checkarg(2,1); |
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icnt = atoi(av[++i]); |
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while (icnt-- > 0) { |
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multmat4(retmat, xfmat, retmat); |
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*retsca *= xfsca; |
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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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multmat4(xfmat, m4, xfmat); /* left multiply */ |
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} |
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done: |
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multmat4(retmat, xfmat, retmat); |
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*retsca *= xfsca; |
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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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#endif |
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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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} |
