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greg |
2.1 |
#ifndef lint |
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greg |
2.10 |
static const char RCSid[] = "$Id: mgf2meta.c,v 2.9 2003/11/15 17:54:06 schorsch Exp $"; |
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greg |
2.1 |
#endif |
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/* |
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greg |
2.2 |
* Convert MGF (Materials and Geometry Format) to Metafile 2-d graphics |
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greg |
2.1 |
*/ |
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#include <stdio.h> |
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greg |
2.6 |
#include <stdlib.h> |
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schorsch |
2.7 |
#include <string.h> |
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greg |
2.1 |
#include <math.h> |
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schorsch |
2.9 |
|
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greg |
2.4 |
#include "random.h" |
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greg |
2.1 |
#include "mgflib/parser.h" |
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schorsch |
2.9 |
#include "plocate.h" /* XXX shouldn't this rather be in rtmath.h? */ |
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greg |
2.1 |
|
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greg |
2.5 |
#define MSIZE ((1<<14)-1) |
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#define MX(v) (int)(MSIZE*(v)[(proj_axis+1)%3]) |
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#define MY(v) (int)(MSIZE*(v)[(proj_axis+2)%3]) |
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greg |
2.1 |
int proj_axis; |
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double limit[3][2]; |
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greg |
2.3 |
int layer; |
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greg |
2.5 |
long rthresh = 1; |
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greg |
2.1 |
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extern int mg_nqcdivs; |
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schorsch |
2.9 |
static int r_face(int ac, char **av); |
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static void newlayer(void); |
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static int doline(int v1x, int v1y, int v2x, int v2y); |
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greg |
2.1 |
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schorsch |
2.9 |
int |
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main( /* convert files to stdout */ |
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int argc, |
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char *argv[] |
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) |
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greg |
2.1 |
{ |
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int i; |
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/* initialize dispatch table */ |
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mg_ehand[MG_E_FACE] = r_face; |
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mg_ehand[MG_E_POINT] = c_hvertex; |
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mg_ehand[MG_E_VERTEX] = c_hvertex; |
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mg_ehand[MG_E_XF] = xf_handler; |
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mg_nqcdivs = 3; /* reduce object subdivision */ |
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mg_init(); /* initialize the parser */ |
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/* get arguments */ |
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greg |
2.5 |
if (argc > 9 && !strcmp(argv[1], "-t")) { |
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rthresh = atof(argv[2])*MSIZE + 0.5; |
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rthresh *= rthresh; |
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argv += 2; |
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argc -= 2; |
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} |
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greg |
2.1 |
if (argc < 8 || (proj_axis = argv[1][0]-'x') < 0 || proj_axis > 2) |
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goto userr; |
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limit[0][0] = atof(argv[2]); limit[0][1] = atof(argv[3]); |
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limit[1][0] = atof(argv[4]); limit[1][1] = atof(argv[5]); |
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limit[2][0] = atof(argv[6]); limit[2][1] = atof(argv[7]); |
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if (argc == 8) { /* convert stdin */ |
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if (mg_load(NULL) != MG_OK) |
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exit(1); |
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} else /* convert each file */ |
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greg |
2.2 |
for (i = 8; i < argc; i++) { |
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greg |
2.1 |
if (mg_load(argv[i]) != MG_OK) |
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exit(1); |
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greg |
2.4 |
newlayer(); |
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greg |
2.2 |
} |
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greg |
2.3 |
mendpage(); /* print page */ |
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greg |
2.2 |
mdone(); /* close output */ |
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greg |
2.1 |
exit(0); |
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userr: |
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greg |
2.5 |
fputs("Usage: mgf2meta [-t thresh] {x|y|z} xmin xmax ymin ymax zmin zmax [file.mgf] ..\n", |
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stderr); |
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greg |
2.1 |
exit(1); |
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} |
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int |
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schorsch |
2.9 |
r_face( /* convert a face */ |
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int ac, |
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char **av |
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) |
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greg |
2.1 |
{ |
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static FVECT bbmin = {0,0,0}, bbmax = {1,1,1}; |
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register int i, j; |
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register C_VERTEX *cv; |
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FVECT v1, v2, vo; |
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90 |
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if (ac < 4) |
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return(MG_EARGC); |
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/* connect to last point */ |
93 |
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if ((cv = c_getvert(av[ac-1])) == NULL) |
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return(MG_EUNDEF); |
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xf_xfmpoint(vo, cv->p); |
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for (j = 0; j < 3; j++) |
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vo[j] = (vo[j] - limit[j][0])/(limit[j][1]-limit[j][0]); |
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for (i = 1; i < ac; i++) { /* go around face */ |
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if ((cv = c_getvert(av[i])) == NULL) |
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return(MG_EUNDEF); |
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xf_xfmpoint(v2, cv->p); |
102 |
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for (j = 0; j < 3; j++) |
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v2[j] = (v2[j] - limit[j][0])/(limit[j][1]-limit[j][0]); |
104 |
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VCOPY(v1, vo); |
105 |
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VCOPY(vo, v2); |
106 |
greg |
2.4 |
if (clip(v1, v2, bbmin, bbmax)) |
107 |
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doline(MX(v1), MY(v1), MX(v2), MY(v2)); |
108 |
greg |
2.1 |
} |
109 |
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return(MG_OK); |
110 |
greg |
2.4 |
} |
111 |
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112 |
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113 |
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#define HTBLSIZ 16381 /* prime hash table size */ |
114 |
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115 |
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short hshtab[HTBLSIZ][4]; /* done line segments */ |
116 |
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117 |
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#define hash(mx1,my1,mx2,my2) ((long)(mx1)<<15 ^ (long)(my1)<<10 ^ \ |
118 |
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(long)(mx2)<<5 ^ (long)(my2)) |
119 |
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120 |
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121 |
schorsch |
2.9 |
void |
122 |
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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 |
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mendpage(); |
127 |
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layer = 0; |
128 |
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} |
129 |
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} |
130 |
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131 |
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132 |
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int |
133 |
schorsch |
2.9 |
doline( /* draw line conditionally */ |
134 |
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int v1x, |
135 |
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int v1y, |
136 |
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int v2x, |
137 |
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int v2y |
138 |
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) |
139 |
greg |
2.4 |
{ |
140 |
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register int h; |
141 |
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142 |
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if (v1x > v2x || (v1x == v2x && v1y > v2y)) { /* sort endpoints */ |
143 |
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h=v1x; v1x=v2x; v2x=h; |
144 |
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h=v1y; v1y=v2y; v2y=h; |
145 |
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} |
146 |
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h = hash(v1x, v1y, v2x, v2y) % HTBLSIZ; |
147 |
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if (hshtab[h][0] == v1x && hshtab[h][1] == v1y && |
148 |
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hshtab[h][2] == v2x && hshtab[h][3] == v2y) |
149 |
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return(0); |
150 |
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hshtab[h][0] = v1x; hshtab[h][1] = v1y; |
151 |
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hshtab[h][2] = v2x; hshtab[h][3] = v2y; |
152 |
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if ((long)(v2x-v1x)*(v2x-v1x) + (long)(v2y-v1y)*(v2y-v1y) |
153 |
greg |
2.5 |
<= random() % rthresh) |
154 |
greg |
2.4 |
return(0); |
155 |
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mline(v1x, v1y, layer/4, 0, layer%4); |
156 |
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mdraw(v2x, v2y); |
157 |
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return(1); |
158 |
greg |
2.1 |
} |