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root/radiance/ray/src/cv/mgf2meta.c
Revision: 2.7
Committed: Mon Jun 30 14:59:11 2003 UTC (20 years, 9 months ago) by schorsch
Content type: text/plain
Branch: MAIN
Changes since 2.6: +3 -6 lines
Log Message:
Replaced most outdated BSD function calls with their posix equivalents, and cleaned up a few other platform dependencies.

File Contents

# User Rev Content
1 greg 2.1 #ifndef lint
2 schorsch 2.7 static const char RCSid[] = "$Id: mgf2meta.c,v 2.6 2003/02/22 02:07:23 greg Exp $";
3 greg 2.1 #endif
4     /*
5 greg 2.2 * Convert MGF (Materials and Geometry Format) to Metafile 2-d graphics
6 greg 2.1 */
7    
8     #include <stdio.h>
9 greg 2.6 #include <stdlib.h>
10 schorsch 2.7 #include <string.h>
11 greg 2.1 #include <math.h>
12 greg 2.4 #include "random.h"
13 greg 2.1 #include "mgflib/parser.h"
14    
15 greg 2.5 #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 greg 2.1 int r_face();
20     int proj_axis;
21     double limit[3][2];
22 greg 2.3 int layer;
23 greg 2.5 long rthresh = 1;
24 greg 2.1
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 greg 2.5 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 greg 2.1 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 greg 2.2 for (i = 8; i < argc; i++) {
58 greg 2.1 if (mg_load(argv[i]) != MG_OK)
59     exit(1);
60 greg 2.4 newlayer();
61 greg 2.2 }
62 greg 2.3 mendpage(); /* print page */
63 greg 2.2 mdone(); /* close output */
64 greg 2.1 exit(0);
65     userr:
66 greg 2.5 fputs("Usage: mgf2meta [-t thresh] {x|y|z} xmin xmax ymin ymax zmin zmax [file.mgf] ..\n",
67     stderr);
68 greg 2.1 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 greg 2.4 if (clip(v1, v2, bbmin, bbmax))
99     doline(MX(v1), MY(v1), MX(v2), MY(v2));
100 greg 2.1 }
101     return(MG_OK);
102 greg 2.4 }
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 schorsch 2.7 (void)memset((char *)hshtab, '\0', sizeof(hshtab));
116 greg 2.4 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 greg 2.5 <= random() % rthresh)
141 greg 2.4 return(0);
142     mline(v1x, v1y, layer/4, 0, layer%4);
143     mdraw(v2x, v2y);
144     return(1);
145 greg 2.1 }