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greg |
2.1 |
/* Copyright (c) 1994 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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* Move a viewpoint the given distance to the right
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*/
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#include "standard.h"
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#include "view.h"
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VIEW leftview = STDVIEW;
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VIEW rightview;
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char *progname;
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main(argc, argv)
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int argc;
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char *argv[];
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{
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char linebuf[256];
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int gotview = 0;
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double dist;
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FVECT v1;
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register int i;
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progname = argv[0];
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if (argc != 2 || !isflt(argv[1])) {
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fprintf(stderr, "Usage: %s offset\n", progname);
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exit(1);
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}
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while (fgets(linebuf, sizeof(linebuf), stdin) != NULL) {
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if (linebuf[0] == '\n')
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break;
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if (isview(linebuf) && sscanview(&leftview, linebuf) > 0)
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gotview++;
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}
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if (!gotview) {
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fprintf(stderr, "%s: no view on standard input\n", progname);
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exit(1);
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}
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fcross(v1, leftview.vdir, leftview.vup);
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if (normalize(v1) == 0.) {
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fprintf(stderr,
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"%s: view direction parallel to view up vector\n",
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progname);
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exit(1);
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}
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copystruct(&rightview, &leftview);
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dist = atof(argv[1]);
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for (i = 0; i < 3; i++)
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rightview.vp[i] += dist*v1[i];
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fputs(VIEWSTR, stdout);
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fprintview(&rightview, stdout);
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putchar('\n');
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exit(0);
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}
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