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root/radiance/ray/src/cv/mgf2meta.c
Revision: 2.11
Committed: Mon Nov 17 13:20:10 2003 UTC (20 years, 4 months ago) by schorsch
Content type: text/plain
Branch: MAIN
CVS Tags: rad3R7P2, rad3R7P1, rad4R0, rad3R6, rad3R6P1, rad3R8, rad3R9
Changes since 2.10: +2 -1 lines
Log Message:
Repeating the original fix in a way that actually works.

File Contents

# Content
1 #ifndef lint
2 static const char RCSid[] = "$Id: mgf2meta.c,v 2.10 2003/11/17 02:21:53 greg 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
13 #include "meta.h"
14 #include "random.h"
15 #include "mgflib/parser.h"
16 #include "plocate.h" /* XXX shouldn't this rather be in rtmath.h? */
17
18 #define MSIZE ((1<<14)-1)
19 #define MX(v) (int)(MSIZE*(v)[(proj_axis+1)%3])
20 #define MY(v) (int)(MSIZE*(v)[(proj_axis+2)%3])
21
22 int proj_axis;
23 double limit[3][2];
24 int layer;
25 long rthresh = 1;
26
27 extern int mg_nqcdivs;
28
29 static int r_face(int ac, char **av);
30 static void newlayer(void);
31 static int doline(int v1x, int v1y, int v2x, int v2y);
32
33
34 int
35 main( /* convert files to stdout */
36 int argc,
37 char *argv[]
38 )
39 {
40 int i;
41 /* initialize dispatch table */
42 mg_ehand[MG_E_FACE] = r_face;
43 mg_ehand[MG_E_POINT] = c_hvertex;
44 mg_ehand[MG_E_VERTEX] = c_hvertex;
45 mg_ehand[MG_E_XF] = xf_handler;
46 mg_nqcdivs = 3; /* reduce object subdivision */
47 mg_init(); /* initialize the parser */
48 /* get arguments */
49 if (argc > 9 && !strcmp(argv[1], "-t")) {
50 rthresh = atof(argv[2])*MSIZE + 0.5;
51 rthresh *= rthresh;
52 argv += 2;
53 argc -= 2;
54 }
55 if (argc < 8 || (proj_axis = argv[1][0]-'x') < 0 || proj_axis > 2)
56 goto userr;
57 limit[0][0] = atof(argv[2]); limit[0][1] = atof(argv[3]);
58 limit[1][0] = atof(argv[4]); limit[1][1] = atof(argv[5]);
59 limit[2][0] = atof(argv[6]); limit[2][1] = atof(argv[7]);
60
61 if (argc == 8) { /* convert stdin */
62 if (mg_load(NULL) != MG_OK)
63 exit(1);
64 } else /* convert each file */
65 for (i = 8; i < argc; i++) {
66 if (mg_load(argv[i]) != MG_OK)
67 exit(1);
68 newlayer();
69 }
70 mendpage(); /* print page */
71 mdone(); /* close output */
72 exit(0);
73 userr:
74 fputs("Usage: mgf2meta [-t thresh] {x|y|z} xmin xmax ymin ymax zmin zmax [file.mgf] ..\n",
75 stderr);
76 exit(1);
77 }
78
79
80 int
81 r_face( /* convert a face */
82 int ac,
83 char **av
84 )
85 {
86 static FVECT bbmin = {0,0,0}, bbmax = {1,1,1};
87 register int i, j;
88 register C_VERTEX *cv;
89 FVECT v1, v2, vo;
90
91 if (ac < 4)
92 return(MG_EARGC);
93 /* connect to last point */
94 if ((cv = c_getvert(av[ac-1])) == NULL)
95 return(MG_EUNDEF);
96 xf_xfmpoint(vo, cv->p);
97 for (j = 0; j < 3; j++)
98 vo[j] = (vo[j] - limit[j][0])/(limit[j][1]-limit[j][0]);
99 for (i = 1; i < ac; i++) { /* go around face */
100 if ((cv = c_getvert(av[i])) == NULL)
101 return(MG_EUNDEF);
102 xf_xfmpoint(v2, cv->p);
103 for (j = 0; j < 3; j++)
104 v2[j] = (v2[j] - limit[j][0])/(limit[j][1]-limit[j][0]);
105 VCOPY(v1, vo);
106 VCOPY(vo, v2);
107 if (clip(v1, v2, bbmin, bbmax))
108 doline(MX(v1), MY(v1), MX(v2), MY(v2));
109 }
110 return(MG_OK);
111 }
112
113
114 #define HTBLSIZ 16381 /* prime hash table size */
115
116 short hshtab[HTBLSIZ][4]; /* done line segments */
117
118 #define hash(mx1,my1,mx2,my2) ((long)(mx1)<<15 ^ (long)(my1)<<10 ^ \
119 (long)(mx2)<<5 ^ (long)(my2))
120
121
122 void
123 newlayer(void) /* start a new layer */
124 {
125 (void)memset((char *)hshtab, '\0', sizeof(hshtab));
126 if (++layer >= 16) {
127 mendpage();
128 layer = 0;
129 }
130 }
131
132
133 int
134 doline( /* draw line conditionally */
135 int v1x,
136 int v1y,
137 int v2x,
138 int v2y
139 )
140 {
141 register int h;
142
143 if (v1x > v2x || (v1x == v2x && v1y > v2y)) { /* sort endpoints */
144 h=v1x; v1x=v2x; v2x=h;
145 h=v1y; v1y=v2y; v2y=h;
146 }
147 h = hash(v1x, v1y, v2x, v2y) % HTBLSIZ;
148 if (hshtab[h][0] == v1x && hshtab[h][1] == v1y &&
149 hshtab[h][2] == v2x && hshtab[h][3] == v2y)
150 return(0);
151 hshtab[h][0] = v1x; hshtab[h][1] = v1y;
152 hshtab[h][2] = v2x; hshtab[h][3] = v2y;
153 if ((long)(v2x-v1x)*(v2x-v1x) + (long)(v2y-v1y)*(v2y-v1y)
154 <= random() % rthresh)
155 return(0);
156 mline(v1x, v1y, layer/4, 0, layer%4);
157 mdraw(v2x, v2y);
158 return(1);
159 }