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/* Copyright (c) 1995 Regents of the University of California */ |
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|
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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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/* |
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* Convert MGF (Materials and Geometry Format) to Metafile 2-d graphics |
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*/ |
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|
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#include <stdio.h> |
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#include <math.h> |
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#include "random.h" |
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#include "mgflib/parser.h" |
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|
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#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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|
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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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int layer; |
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|
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extern int mg_nqcdivs; |
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|
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|
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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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|
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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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} else /* convert each file */ |
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for (i = 8; i < argc; i++) { |
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if (mg_load(argv[i]) != MG_OK) |
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exit(1); |
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newlayer(); |
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} |
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mendpage(); /* print page */ |
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mdone(); /* close output */ |
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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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|
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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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|
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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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doline(MX(v1), MY(v1), MX(v2), MY(v2)); |
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} |
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return(MG_OK); |
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} |
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|
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|
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#define HTBLSIZ 16381 /* prime hash table size */ |
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|
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short hshtab[HTBLSIZ][4]; /* done line segments */ |
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|
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#define hash(mx1,my1,mx2,my2) ((long)(mx1)<<15 ^ (long)(my1)<<10 ^ \ |
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(long)(mx2)<<5 ^ (long)(my2)) |
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|
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#define RANDMASK ((1L<<14)-1) |
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|
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|
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newlayer() /* start a new layer */ |
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{ |
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#ifdef BSD |
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bzero((char *)hshtab, sizeof(hshtab)); |
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#else |
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(void)memset((char *)hshtab, 0, sizeof(hshtab)); |
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#endif |
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if (++layer >= 16) { |
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mendpage(); |
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layer = 0; |
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} |
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} |
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|
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|
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int |
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doline(v1x, v1y, v2x, v2y) /* draw line conditionally */ |
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int v1x, v1y, v2x, v2y; |
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{ |
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register int h; |
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|
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if (v1x > v2x || (v1x == v2x && v1y > v2y)) { /* sort endpoints */ |
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h=v1x; v1x=v2x; v2x=h; |
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h=v1y; v1y=v2y; v2y=h; |
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} |
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h = hash(v1x, v1y, v2x, v2y) % HTBLSIZ; |
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if (hshtab[h][0] == v1x && hshtab[h][1] == v1y && |
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hshtab[h][2] == v2x && hshtab[h][3] == v2y) |
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return(0); |
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hshtab[h][0] = v1x; hshtab[h][1] = v1y; |
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hshtab[h][2] = v2x; hshtab[h][3] = v2y; |
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if ((long)(v2x-v1x)*(v2x-v1x) + (long)(v2y-v1y)*(v2y-v1y) |
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<= (random()&RANDMASK)) |
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return(0); |
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mline(v1x, v1y, layer/4, 0, layer%4); |
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mdraw(v2x, v2y); |
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return(1); |
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} |
