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greg |
2.1 |
/* Copyright (c) 1995 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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greg |
2.2 |
* Convert MGF (Materials and Geometry Format) to Metafile 2-d graphics
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greg |
2.1 |
*/
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#include <stdio.h>
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#include <math.h>
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#include "mgflib/parser.h"
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greg |
2.2 |
#define MX(v) (int)(((1<<14)-1)*(v)[(proj_axis+1)%3])
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#define MY(v) (int)(((1<<14)-1)*(v)[(proj_axis+2)%3])
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greg |
2.1 |
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int r_face();
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int proj_axis;
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double limit[3][2];
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extern int mg_nqcdivs;
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main(argc, argv) /* convert files to stdout */
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int argc;
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char *argv[];
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{
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int i;
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/* initialize dispatch table */
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mg_ehand[MG_E_FACE] = r_face;
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mg_ehand[MG_E_POINT] = c_hvertex;
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mg_ehand[MG_E_VERTEX] = c_hvertex;
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mg_ehand[MG_E_XF] = xf_handler;
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mg_nqcdivs = 3; /* reduce object subdivision */
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mg_init(); /* initialize the parser */
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/* get arguments */
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if (argc < 8 || (proj_axis = argv[1][0]-'x') < 0 || proj_axis > 2)
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goto userr;
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limit[0][0] = atof(argv[2]); limit[0][1] = atof(argv[3]);
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limit[1][0] = atof(argv[4]); limit[1][1] = atof(argv[5]);
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limit[2][0] = atof(argv[6]); limit[2][1] = atof(argv[7]);
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if (argc == 8) { /* convert stdin */
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if (mg_load(NULL) != MG_OK)
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exit(1);
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greg |
2.2 |
mendpage();
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greg |
2.1 |
} else /* convert each file */
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greg |
2.2 |
for (i = 8; i < argc; i++) {
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greg |
2.1 |
if (mg_load(argv[i]) != MG_OK)
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exit(1);
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greg |
2.2 |
mendpage();
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}
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mdone(); /* close output */
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greg |
2.1 |
exit(0);
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userr:
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fprintf(stderr, "Usage: %s {x|y|z} xmin xmax ymin ymax zmin zmax [file.mgf] ..\n",
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argv[0]);
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exit(1);
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}
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int
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r_face(ac, av) /* convert a face */
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int ac;
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char **av;
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{
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static FVECT bbmin = {0,0,0}, bbmax = {1,1,1};
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register int i, j;
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register C_VERTEX *cv;
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FVECT v1, v2, vo;
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int newline = 1;
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if (ac < 4)
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return(MG_EARGC);
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/* connect to last point */
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if ((cv = c_getvert(av[ac-1])) == NULL)
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return(MG_EUNDEF);
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xf_xfmpoint(vo, cv->p);
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for (j = 0; j < 3; j++)
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vo[j] = (vo[j] - limit[j][0])/(limit[j][1]-limit[j][0]);
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for (i = 1; i < ac; i++) { /* go around face */
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if ((cv = c_getvert(av[i])) == NULL)
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return(MG_EUNDEF);
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xf_xfmpoint(v2, cv->p);
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for (j = 0; j < 3; j++)
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v2[j] = (v2[j] - limit[j][0])/(limit[j][1]-limit[j][0]);
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VCOPY(v1, vo);
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VCOPY(vo, v2);
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if (clip(v1, v2, bbmin, bbmax)) {
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mline(MX(v1), MY(v1), 0, 0, 0);
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mdraw(MX(v2), MY(v2));
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}
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}
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return(MG_OK);
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}
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