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root/radiance/ray/src/cv/mgf2meta.c
Revision: 2.8
Committed: Tue Oct 21 19:19:28 2003 UTC (20 years, 5 months ago) by schorsch
Content type: text/plain
Branch: MAIN
Changes since 2.7: +2 -2 lines
Log Message:
Various platform compatibility fixes.

File Contents

# Content
1 #ifndef lint
2 static const char RCSid[] = "$Id: mgf2meta.c,v 2.7 2003/06/30 14:59:11 schorsch Exp $";
3 #endif
4 /*
5 * Convert MGF (Materials and Geometry Format) to Metafile 2-d graphics
6 */
7
8 #include <stdio.h>
9 #include <stdlib.h>
10 #include <string.h>
11 #include <math.h>
12 #include "random.h"
13 #include "mgflib/parser.h"
14
15 #define MSIZE ((1<<14)-1)
16 #define MX(v) (int)(MSIZE*(v)[(proj_axis+1)%3])
17 #define MY(v) (int)(MSIZE*(v)[(proj_axis+2)%3])
18
19 int r_face(int ac, char **av);
20 int proj_axis;
21 double limit[3][2];
22 int layer;
23 long rthresh = 1;
24
25 extern int mg_nqcdivs;
26
27
28 main(argc, argv) /* convert files to stdout */
29 int argc;
30 char *argv[];
31 {
32 int i;
33 /* initialize dispatch table */
34 mg_ehand[MG_E_FACE] = r_face;
35 mg_ehand[MG_E_POINT] = c_hvertex;
36 mg_ehand[MG_E_VERTEX] = c_hvertex;
37 mg_ehand[MG_E_XF] = xf_handler;
38 mg_nqcdivs = 3; /* reduce object subdivision */
39 mg_init(); /* initialize the parser */
40 /* get arguments */
41 if (argc > 9 && !strcmp(argv[1], "-t")) {
42 rthresh = atof(argv[2])*MSIZE + 0.5;
43 rthresh *= rthresh;
44 argv += 2;
45 argc -= 2;
46 }
47 if (argc < 8 || (proj_axis = argv[1][0]-'x') < 0 || proj_axis > 2)
48 goto userr;
49 limit[0][0] = atof(argv[2]); limit[0][1] = atof(argv[3]);
50 limit[1][0] = atof(argv[4]); limit[1][1] = atof(argv[5]);
51 limit[2][0] = atof(argv[6]); limit[2][1] = atof(argv[7]);
52
53 if (argc == 8) { /* convert stdin */
54 if (mg_load(NULL) != MG_OK)
55 exit(1);
56 } else /* convert each file */
57 for (i = 8; i < argc; i++) {
58 if (mg_load(argv[i]) != MG_OK)
59 exit(1);
60 newlayer();
61 }
62 mendpage(); /* print page */
63 mdone(); /* close output */
64 exit(0);
65 userr:
66 fputs("Usage: mgf2meta [-t thresh] {x|y|z} xmin xmax ymin ymax zmin zmax [file.mgf] ..\n",
67 stderr);
68 exit(1);
69 }
70
71
72 int
73 r_face(ac, av) /* convert a face */
74 int ac;
75 char **av;
76 {
77 static FVECT bbmin = {0,0,0}, bbmax = {1,1,1};
78 register int i, j;
79 register C_VERTEX *cv;
80 FVECT v1, v2, vo;
81
82 if (ac < 4)
83 return(MG_EARGC);
84 /* connect to last point */
85 if ((cv = c_getvert(av[ac-1])) == NULL)
86 return(MG_EUNDEF);
87 xf_xfmpoint(vo, cv->p);
88 for (j = 0; j < 3; j++)
89 vo[j] = (vo[j] - limit[j][0])/(limit[j][1]-limit[j][0]);
90 for (i = 1; i < ac; i++) { /* go around face */
91 if ((cv = c_getvert(av[i])) == NULL)
92 return(MG_EUNDEF);
93 xf_xfmpoint(v2, cv->p);
94 for (j = 0; j < 3; j++)
95 v2[j] = (v2[j] - limit[j][0])/(limit[j][1]-limit[j][0]);
96 VCOPY(v1, vo);
97 VCOPY(vo, v2);
98 if (clip(v1, v2, bbmin, bbmax))
99 doline(MX(v1), MY(v1), MX(v2), MY(v2));
100 }
101 return(MG_OK);
102 }
103
104
105 #define HTBLSIZ 16381 /* prime hash table size */
106
107 short hshtab[HTBLSIZ][4]; /* done line segments */
108
109 #define hash(mx1,my1,mx2,my2) ((long)(mx1)<<15 ^ (long)(my1)<<10 ^ \
110 (long)(mx2)<<5 ^ (long)(my2))
111
112
113 newlayer() /* start a new layer */
114 {
115 (void)memset((char *)hshtab, '\0', sizeof(hshtab));
116 if (++layer >= 16) {
117 mendpage();
118 layer = 0;
119 }
120 }
121
122
123 int
124 doline(v1x, v1y, v2x, v2y) /* draw line conditionally */
125 int v1x, v1y, v2x, v2y;
126 {
127 register int h;
128
129 if (v1x > v2x || (v1x == v2x && v1y > v2y)) { /* sort endpoints */
130 h=v1x; v1x=v2x; v2x=h;
131 h=v1y; v1y=v2y; v2y=h;
132 }
133 h = hash(v1x, v1y, v2x, v2y) % HTBLSIZ;
134 if (hshtab[h][0] == v1x && hshtab[h][1] == v1y &&
135 hshtab[h][2] == v2x && hshtab[h][3] == v2y)
136 return(0);
137 hshtab[h][0] = v1x; hshtab[h][1] = v1y;
138 hshtab[h][2] = v2x; hshtab[h][3] = v2y;
139 if ((long)(v2x-v1x)*(v2x-v1x) + (long)(v2y-v1y)*(v2y-v1y)
140 <= random() % rthresh)
141 return(0);
142 mline(v1x, v1y, layer/4, 0, layer%4);
143 mdraw(v2x, v2y);
144 return(1);
145 }