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root/radiance/ray/src/cv/mgf2meta.c
Revision: 2.10
Committed: Mon Nov 17 02:21:53 2003 UTC (20 years, 8 months ago) by greg
Content type: text/plain
Branch: MAIN
Changes since 2.9: +1 -2 lines
Log Message:
Unix compile fixes for previous change

File Contents

# User Rev Content
1 greg 2.1 #ifndef lint
2 greg 2.10 static const char RCSid[] = "$Id: mgf2meta.c,v 2.9 2003/11/15 17:54:06 schorsch 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 schorsch 2.9
13 greg 2.4 #include "random.h"
14 greg 2.1 #include "mgflib/parser.h"
15 schorsch 2.9 #include "plocate.h" /* XXX shouldn't this rather be in rtmath.h? */
16 greg 2.1
17 greg 2.5 #define MSIZE ((1<<14)-1)
18     #define MX(v) (int)(MSIZE*(v)[(proj_axis+1)%3])
19     #define MY(v) (int)(MSIZE*(v)[(proj_axis+2)%3])
20    
21 greg 2.1 int proj_axis;
22     double limit[3][2];
23 greg 2.3 int layer;
24 greg 2.5 long rthresh = 1;
25 greg 2.1
26     extern int mg_nqcdivs;
27    
28 schorsch 2.9 static int r_face(int ac, char **av);
29     static void newlayer(void);
30     static int doline(int v1x, int v1y, int v2x, int v2y);
31    
32 greg 2.1
33 schorsch 2.9 int
34     main( /* convert files to stdout */
35     int argc,
36     char *argv[]
37     )
38 greg 2.1 {
39     int i;
40     /* initialize dispatch table */
41     mg_ehand[MG_E_FACE] = r_face;
42     mg_ehand[MG_E_POINT] = c_hvertex;
43     mg_ehand[MG_E_VERTEX] = c_hvertex;
44     mg_ehand[MG_E_XF] = xf_handler;
45     mg_nqcdivs = 3; /* reduce object subdivision */
46     mg_init(); /* initialize the parser */
47     /* get arguments */
48 greg 2.5 if (argc > 9 && !strcmp(argv[1], "-t")) {
49     rthresh = atof(argv[2])*MSIZE + 0.5;
50     rthresh *= rthresh;
51     argv += 2;
52     argc -= 2;
53     }
54 greg 2.1 if (argc < 8 || (proj_axis = argv[1][0]-'x') < 0 || proj_axis > 2)
55     goto userr;
56     limit[0][0] = atof(argv[2]); limit[0][1] = atof(argv[3]);
57     limit[1][0] = atof(argv[4]); limit[1][1] = atof(argv[5]);
58     limit[2][0] = atof(argv[6]); limit[2][1] = atof(argv[7]);
59    
60     if (argc == 8) { /* convert stdin */
61     if (mg_load(NULL) != MG_OK)
62     exit(1);
63     } else /* convert each file */
64 greg 2.2 for (i = 8; i < argc; i++) {
65 greg 2.1 if (mg_load(argv[i]) != MG_OK)
66     exit(1);
67 greg 2.4 newlayer();
68 greg 2.2 }
69 greg 2.3 mendpage(); /* print page */
70 greg 2.2 mdone(); /* close output */
71 greg 2.1 exit(0);
72     userr:
73 greg 2.5 fputs("Usage: mgf2meta [-t thresh] {x|y|z} xmin xmax ymin ymax zmin zmax [file.mgf] ..\n",
74     stderr);
75 greg 2.1 exit(1);
76     }
77    
78    
79     int
80 schorsch 2.9 r_face( /* convert a face */
81     int ac,
82     char **av
83     )
84 greg 2.1 {
85     static FVECT bbmin = {0,0,0}, bbmax = {1,1,1};
86     register int i, j;
87     register C_VERTEX *cv;
88     FVECT v1, v2, vo;
89    
90     if (ac < 4)
91     return(MG_EARGC);
92     /* connect to last point */
93     if ((cv = c_getvert(av[ac-1])) == NULL)
94     return(MG_EUNDEF);
95     xf_xfmpoint(vo, cv->p);
96     for (j = 0; j < 3; j++)
97     vo[j] = (vo[j] - limit[j][0])/(limit[j][1]-limit[j][0]);
98     for (i = 1; i < ac; i++) { /* go around face */
99     if ((cv = c_getvert(av[i])) == NULL)
100     return(MG_EUNDEF);
101     xf_xfmpoint(v2, cv->p);
102     for (j = 0; j < 3; j++)
103     v2[j] = (v2[j] - limit[j][0])/(limit[j][1]-limit[j][0]);
104     VCOPY(v1, vo);
105     VCOPY(vo, v2);
106 greg 2.4 if (clip(v1, v2, bbmin, bbmax))
107     doline(MX(v1), MY(v1), MX(v2), MY(v2));
108 greg 2.1 }
109     return(MG_OK);
110 greg 2.4 }
111    
112    
113     #define HTBLSIZ 16381 /* prime hash table size */
114    
115     short hshtab[HTBLSIZ][4]; /* done line segments */
116    
117     #define hash(mx1,my1,mx2,my2) ((long)(mx1)<<15 ^ (long)(my1)<<10 ^ \
118     (long)(mx2)<<5 ^ (long)(my2))
119    
120    
121 schorsch 2.9 void
122     newlayer(void) /* start a new layer */
123 greg 2.4 {
124 schorsch 2.7 (void)memset((char *)hshtab, '\0', sizeof(hshtab));
125 greg 2.4 if (++layer >= 16) {
126     mendpage();
127     layer = 0;
128     }
129     }
130    
131    
132     int
133 schorsch 2.9 doline( /* draw line conditionally */
134     int v1x,
135     int v1y,
136     int v2x,
137     int v2y
138     )
139 greg 2.4 {
140     register int h;
141    
142     if (v1x > v2x || (v1x == v2x && v1y > v2y)) { /* sort endpoints */
143     h=v1x; v1x=v2x; v2x=h;
144     h=v1y; v1y=v2y; v2y=h;
145     }
146     h = hash(v1x, v1y, v2x, v2y) % HTBLSIZ;
147     if (hshtab[h][0] == v1x && hshtab[h][1] == v1y &&
148     hshtab[h][2] == v2x && hshtab[h][3] == v2y)
149     return(0);
150     hshtab[h][0] = v1x; hshtab[h][1] = v1y;
151     hshtab[h][2] = v2x; hshtab[h][3] = v2y;
152     if ((long)(v2x-v1x)*(v2x-v1x) + (long)(v2y-v1y)*(v2y-v1y)
153 greg 2.5 <= random() % rthresh)
154 greg 2.4 return(0);
155     mline(v1x, v1y, layer/4, 0, layer%4);
156     mdraw(v2x, v2y);
157     return(1);
158 greg 2.1 }