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root/radiance/ray/src/cv/mgf2meta.c
Revision: 2.5
Committed: Thu May 4 14:25:15 1995 UTC (28 years, 11 months ago) by greg
Content type: text/plain
Branch: MAIN
Changes since 2.4: +17 -7 lines
Log Message:
made random tossing of lines optional with -t

File Contents

# User Rev Content
1 greg 2.1 /* Copyright (c) 1995 Regents of the University of California */
2    
3     #ifndef lint
4     static char SCCSid[] = "$SunId$ LBL";
5     #endif
6    
7     /*
8 greg 2.2 * Convert MGF (Materials and Geometry Format) to Metafile 2-d graphics
9 greg 2.1 */
10    
11     #include <stdio.h>
12     #include <math.h>
13 greg 2.4 #include "random.h"
14 greg 2.1 #include "mgflib/parser.h"
15    
16 greg 2.5 #define MSIZE ((1<<14)-1)
17     #define MX(v) (int)(MSIZE*(v)[(proj_axis+1)%3])
18     #define MY(v) (int)(MSIZE*(v)[(proj_axis+2)%3])
19 greg 2.1
20 greg 2.5 #ifdef DCL_ATOF
21     extern double atof();
22     #endif
23    
24 greg 2.1 int r_face();
25     int proj_axis;
26     double limit[3][2];
27 greg 2.3 int layer;
28 greg 2.5 long rthresh = 1;
29 greg 2.1
30     extern int mg_nqcdivs;
31    
32    
33     main(argc, argv) /* convert files to stdout */
34     int argc;
35     char *argv[];
36     {
37     int i;
38     /* initialize dispatch table */
39     mg_ehand[MG_E_FACE] = r_face;
40     mg_ehand[MG_E_POINT] = c_hvertex;
41     mg_ehand[MG_E_VERTEX] = c_hvertex;
42     mg_ehand[MG_E_XF] = xf_handler;
43     mg_nqcdivs = 3; /* reduce object subdivision */
44     mg_init(); /* initialize the parser */
45     /* get arguments */
46 greg 2.5 if (argc > 9 && !strcmp(argv[1], "-t")) {
47     rthresh = atof(argv[2])*MSIZE + 0.5;
48     rthresh *= rthresh;
49     argv += 2;
50     argc -= 2;
51     }
52 greg 2.1 if (argc < 8 || (proj_axis = argv[1][0]-'x') < 0 || proj_axis > 2)
53     goto userr;
54     limit[0][0] = atof(argv[2]); limit[0][1] = atof(argv[3]);
55     limit[1][0] = atof(argv[4]); limit[1][1] = atof(argv[5]);
56     limit[2][0] = atof(argv[6]); limit[2][1] = atof(argv[7]);
57    
58     if (argc == 8) { /* convert stdin */
59     if (mg_load(NULL) != MG_OK)
60     exit(1);
61     } else /* convert each file */
62 greg 2.2 for (i = 8; i < argc; i++) {
63 greg 2.1 if (mg_load(argv[i]) != MG_OK)
64     exit(1);
65 greg 2.4 newlayer();
66 greg 2.2 }
67 greg 2.3 mendpage(); /* print page */
68 greg 2.2 mdone(); /* close output */
69 greg 2.1 exit(0);
70     userr:
71 greg 2.5 fputs("Usage: mgf2meta [-t thresh] {x|y|z} xmin xmax ymin ymax zmin zmax [file.mgf] ..\n",
72     stderr);
73 greg 2.1 exit(1);
74     }
75    
76    
77     int
78     r_face(ac, av) /* convert a face */
79     int ac;
80     char **av;
81     {
82     static FVECT bbmin = {0,0,0}, bbmax = {1,1,1};
83     register int i, j;
84     register C_VERTEX *cv;
85     FVECT v1, v2, vo;
86    
87     if (ac < 4)
88     return(MG_EARGC);
89     /* connect to last point */
90     if ((cv = c_getvert(av[ac-1])) == NULL)
91     return(MG_EUNDEF);
92     xf_xfmpoint(vo, cv->p);
93     for (j = 0; j < 3; j++)
94     vo[j] = (vo[j] - limit[j][0])/(limit[j][1]-limit[j][0]);
95     for (i = 1; i < ac; i++) { /* go around face */
96     if ((cv = c_getvert(av[i])) == NULL)
97     return(MG_EUNDEF);
98     xf_xfmpoint(v2, cv->p);
99     for (j = 0; j < 3; j++)
100     v2[j] = (v2[j] - limit[j][0])/(limit[j][1]-limit[j][0]);
101     VCOPY(v1, vo);
102     VCOPY(vo, v2);
103 greg 2.4 if (clip(v1, v2, bbmin, bbmax))
104     doline(MX(v1), MY(v1), MX(v2), MY(v2));
105 greg 2.1 }
106     return(MG_OK);
107 greg 2.4 }
108    
109    
110     #define HTBLSIZ 16381 /* prime hash table size */
111    
112     short hshtab[HTBLSIZ][4]; /* done line segments */
113    
114     #define hash(mx1,my1,mx2,my2) ((long)(mx1)<<15 ^ (long)(my1)<<10 ^ \
115     (long)(mx2)<<5 ^ (long)(my2))
116    
117    
118     newlayer() /* start a new layer */
119     {
120     #ifdef BSD
121     bzero((char *)hshtab, sizeof(hshtab));
122     #else
123     (void)memset((char *)hshtab, 0, sizeof(hshtab));
124     #endif
125     if (++layer >= 16) {
126     mendpage();
127     layer = 0;
128     }
129     }
130    
131    
132     int
133     doline(v1x, v1y, v2x, v2y) /* draw line conditionally */
134     int v1x, v1y, v2x, v2y;
135     {
136     register int h;
137    
138     if (v1x > v2x || (v1x == v2x && v1y > v2y)) { /* sort endpoints */
139     h=v1x; v1x=v2x; v2x=h;
140     h=v1y; v1y=v2y; v2y=h;
141     }
142     h = hash(v1x, v1y, v2x, v2y) % HTBLSIZ;
143     if (hshtab[h][0] == v1x && hshtab[h][1] == v1y &&
144     hshtab[h][2] == v2x && hshtab[h][3] == v2y)
145     return(0);
146     hshtab[h][0] = v1x; hshtab[h][1] = v1y;
147     hshtab[h][2] = v2x; hshtab[h][3] = v2y;
148     if ((long)(v2x-v1x)*(v2x-v1x) + (long)(v2y-v1y)*(v2y-v1y)
149 greg 2.5 <= random() % rthresh)
150 greg 2.4 return(0);
151     mline(v1x, v1y, layer/4, 0, layer%4);
152     mdraw(v2x, v2y);
153     return(1);
154 greg 2.1 }