| 1 |
#ifndef lint |
| 2 |
static const char RCSid[] = "$Id: parser.c,v 1.27 2003/02/28 20:11:29 greg Exp $"; |
| 3 |
#endif |
| 4 |
/* |
| 5 |
* Parse an MGF file, converting or discarding unsupported entities |
| 6 |
*/ |
| 7 |
|
| 8 |
#include <stdio.h> |
| 9 |
#include <stdlib.h> |
| 10 |
#include <math.h> |
| 11 |
#include <ctype.h> |
| 12 |
#include <string.h> |
| 13 |
#include "parser.h" |
| 14 |
#include "lookup.h" |
| 15 |
#include "messages.h" |
| 16 |
|
| 17 |
/* |
| 18 |
* Global definitions of variables declared in parser.h |
| 19 |
*/ |
| 20 |
/* entity names */ |
| 21 |
|
| 22 |
char mg_ename[MG_NENTITIES][MG_MAXELEN] = MG_NAMELIST; |
| 23 |
|
| 24 |
/* Handler routines for each entity */ |
| 25 |
|
| 26 |
int (*mg_ehand[MG_NENTITIES])(); |
| 27 |
|
| 28 |
/* Handler routine for unknown entities */ |
| 29 |
|
| 30 |
int (*mg_uhand)() = mg_defuhand; |
| 31 |
|
| 32 |
unsigned mg_nunknown; /* count of unknown entities */ |
| 33 |
|
| 34 |
/* error messages */ |
| 35 |
|
| 36 |
char *mg_err[MG_NERRS] = MG_ERRLIST; |
| 37 |
|
| 38 |
MG_FCTXT *mg_file; /* current file context pointer */ |
| 39 |
|
| 40 |
int mg_nqcdivs = MG_NQCD; /* number of divisions per quarter circle */ |
| 41 |
|
| 42 |
/* |
| 43 |
* The idea with this parser is to compensate for any missing entries in |
| 44 |
* mg_ehand with alternate handlers that express these entities in terms |
| 45 |
* of others that the calling program can handle. |
| 46 |
* |
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* In some cases, no alternate handler is possible because the entity |
| 48 |
* has no approximate equivalent. These entities are simply discarded. |
| 49 |
* |
| 50 |
* Certain entities are dependent on others, and mg_init() will fail |
| 51 |
* if the supported entities are not consistent. |
| 52 |
* |
| 53 |
* Some alternate entity handlers require that earlier entities be |
| 54 |
* noted in some fashion, and we therefore keep another array of |
| 55 |
* parallel support handlers to assist in this effort. |
| 56 |
*/ |
| 57 |
|
| 58 |
/* temporary settings for testing */ |
| 59 |
#define e_ies e_any_toss |
| 60 |
/* alternate handler routines */ |
| 61 |
|
| 62 |
static void make_axes(FVECT u, FVECT v, FVECT w); |
| 63 |
static int put_cxy(void); |
| 64 |
static int put_cspec(void); |
| 65 |
|
| 66 |
static int e_any_toss(int ac, char **av); /* discard an unwanted entity */ |
| 67 |
static int e_cspec(int ac, char **av); /* handle spectral color */ |
| 68 |
static int e_cmix(int ac, char **av); /* handle mixing of colors */ |
| 69 |
static int e_cct(int ac, char **av); /* handle color temperature */ |
| 70 |
|
| 71 |
|
| 72 |
/* alternate handler support functions */ |
| 73 |
|
| 74 |
static int (*e_supp[MG_NENTITIES])(int ac, char **av); |
| 75 |
|
| 76 |
static char FLTFMT[] = "%.12g"; |
| 77 |
|
| 78 |
static int warpconends; /* hack for generating good normals */ |
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|
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|
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void |
| 82 |
mg_init(void) /* initialize alternate entity handlers */ |
| 83 |
{ |
| 84 |
unsigned long ineed = 0, uneed = 0; |
| 85 |
register int i; |
| 86 |
/* pick up slack */ |
| 87 |
if (mg_ehand[MG_E_IES] == NULL) |
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mg_ehand[MG_E_IES] = e_ies; |
| 89 |
if (mg_ehand[MG_E_INCLUDE] == NULL) |
| 90 |
mg_ehand[MG_E_INCLUDE] = e_include; |
| 91 |
if (mg_ehand[MG_E_SPH] == NULL) { |
| 92 |
mg_ehand[MG_E_SPH] = e_sph; |
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ineed |= 1L<<MG_E_POINT|1L<<MG_E_VERTEX; |
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} else |
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uneed |= 1L<<MG_E_POINT|1L<<MG_E_VERTEX|1L<<MG_E_XF; |
| 96 |
if (mg_ehand[MG_E_CYL] == NULL) { |
| 97 |
mg_ehand[MG_E_CYL] = e_cyl; |
| 98 |
ineed |= 1L<<MG_E_POINT|1L<<MG_E_VERTEX; |
| 99 |
} else |
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uneed |= 1L<<MG_E_POINT|1L<<MG_E_VERTEX|1L<<MG_E_XF; |
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if (mg_ehand[MG_E_CONE] == NULL) { |
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mg_ehand[MG_E_CONE] = e_cone; |
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ineed |= 1L<<MG_E_POINT|1L<<MG_E_VERTEX; |
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} else |
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uneed |= 1L<<MG_E_POINT|1L<<MG_E_VERTEX|1L<<MG_E_XF; |
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if (mg_ehand[MG_E_RING] == NULL) { |
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mg_ehand[MG_E_RING] = e_ring; |
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ineed |= 1L<<MG_E_POINT|1L<<MG_E_NORMAL|1L<<MG_E_VERTEX; |
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} else |
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uneed |= 1L<<MG_E_POINT|1L<<MG_E_NORMAL|1L<<MG_E_VERTEX|1L<<MG_E_XF; |
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if (mg_ehand[MG_E_PRISM] == NULL) { |
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mg_ehand[MG_E_PRISM] = e_prism; |
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ineed |= 1L<<MG_E_POINT|1L<<MG_E_VERTEX; |
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} else |
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uneed |= 1L<<MG_E_POINT|1L<<MG_E_VERTEX|1L<<MG_E_XF; |
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if (mg_ehand[MG_E_TORUS] == NULL) { |
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mg_ehand[MG_E_TORUS] = e_torus; |
| 118 |
ineed |= 1L<<MG_E_POINT|1L<<MG_E_NORMAL|1L<<MG_E_VERTEX; |
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} else |
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uneed |= 1L<<MG_E_POINT|1L<<MG_E_NORMAL|1L<<MG_E_VERTEX|1L<<MG_E_XF; |
| 121 |
if (mg_ehand[MG_E_FACE] == NULL) |
| 122 |
mg_ehand[MG_E_FACE] = mg_ehand[MG_E_FACEH]; |
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else if (mg_ehand[MG_E_FACEH] == NULL) |
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mg_ehand[MG_E_FACEH] = e_faceh; |
| 125 |
if (mg_ehand[MG_E_COLOR] != NULL) { |
| 126 |
if (mg_ehand[MG_E_CMIX] == NULL) { |
| 127 |
mg_ehand[MG_E_CMIX] = e_cmix; |
| 128 |
ineed |= 1L<<MG_E_COLOR|1L<<MG_E_CXY|1L<<MG_E_CSPEC|1L<<MG_E_CMIX|1L<<MG_E_CCT; |
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} |
| 130 |
if (mg_ehand[MG_E_CSPEC] == NULL) { |
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mg_ehand[MG_E_CSPEC] = e_cspec; |
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ineed |= 1L<<MG_E_COLOR|1L<<MG_E_CXY|1L<<MG_E_CSPEC|1L<<MG_E_CMIX|1L<<MG_E_CCT; |
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} |
| 134 |
if (mg_ehand[MG_E_CCT] == NULL) { |
| 135 |
mg_ehand[MG_E_CCT] = e_cct; |
| 136 |
ineed |= 1L<<MG_E_COLOR|1L<<MG_E_CXY|1L<<MG_E_CSPEC|1L<<MG_E_CMIX|1L<<MG_E_CCT; |
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} |
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} |
| 139 |
/* check for consistency */ |
| 140 |
if (mg_ehand[MG_E_FACE] != NULL) |
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uneed |= 1L<<MG_E_POINT|1L<<MG_E_VERTEX|1L<<MG_E_XF; |
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if (mg_ehand[MG_E_CXY] != NULL || mg_ehand[MG_E_CSPEC] != NULL || |
| 143 |
mg_ehand[MG_E_CMIX] != NULL) |
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uneed |= 1L<<MG_E_COLOR; |
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if (mg_ehand[MG_E_RD] != NULL || mg_ehand[MG_E_TD] != NULL || |
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mg_ehand[MG_E_IR] != NULL || |
| 147 |
mg_ehand[MG_E_ED] != NULL || |
| 148 |
mg_ehand[MG_E_RS] != NULL || |
| 149 |
mg_ehand[MG_E_TS] != NULL || |
| 150 |
mg_ehand[MG_E_SIDES] != NULL) |
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uneed |= 1L<<MG_E_MATERIAL; |
| 152 |
for (i = 0; i < MG_NENTITIES; i++) |
| 153 |
if (uneed & 1L<<i && mg_ehand[i] == NULL) { |
| 154 |
fprintf(stderr, "Missing support for \"%s\" entity\n", |
| 155 |
mg_ename[i]); |
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exit(1); |
| 157 |
} |
| 158 |
/* add support as needed */ |
| 159 |
if (ineed & 1L<<MG_E_VERTEX && mg_ehand[MG_E_VERTEX] != c_hvertex) |
| 160 |
e_supp[MG_E_VERTEX] = c_hvertex; |
| 161 |
if (ineed & 1L<<MG_E_POINT && mg_ehand[MG_E_POINT] != c_hvertex) |
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e_supp[MG_E_POINT] = c_hvertex; |
| 163 |
if (ineed & 1L<<MG_E_NORMAL && mg_ehand[MG_E_NORMAL] != c_hvertex) |
| 164 |
e_supp[MG_E_NORMAL] = c_hvertex; |
| 165 |
if (ineed & 1L<<MG_E_COLOR && mg_ehand[MG_E_COLOR] != c_hcolor) |
| 166 |
e_supp[MG_E_COLOR] = c_hcolor; |
| 167 |
if (ineed & 1L<<MG_E_CXY && mg_ehand[MG_E_CXY] != c_hcolor) |
| 168 |
e_supp[MG_E_CXY] = c_hcolor; |
| 169 |
if (ineed & 1L<<MG_E_CSPEC && mg_ehand[MG_E_CSPEC] != c_hcolor) |
| 170 |
e_supp[MG_E_CSPEC] = c_hcolor; |
| 171 |
if (ineed & 1L<<MG_E_CMIX && mg_ehand[MG_E_CMIX] != c_hcolor) |
| 172 |
e_supp[MG_E_CMIX] = c_hcolor; |
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if (ineed & 1L<<MG_E_CCT && mg_ehand[MG_E_CCT] != c_hcolor) |
| 174 |
e_supp[MG_E_CCT] = c_hcolor; |
| 175 |
/* discard remaining entities */ |
| 176 |
for (i = 0; i < MG_NENTITIES; i++) |
| 177 |
if (mg_ehand[i] == NULL) |
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mg_ehand[i] = e_any_toss; |
| 179 |
} |
| 180 |
|
| 181 |
|
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int |
| 183 |
mg_entity( /* get entity number from its name */ |
| 184 |
char *name |
| 185 |
) |
| 186 |
{ |
| 187 |
static LUTAB ent_tab = LU_SINIT(NULL,NULL); /* lookup table */ |
| 188 |
register char *cp; |
| 189 |
|
| 190 |
if (!ent_tab.tsiz) { /* initialize hash table */ |
| 191 |
if (!lu_init(&ent_tab, MG_NENTITIES)) |
| 192 |
return(-1); /* what to do? */ |
| 193 |
for (cp = mg_ename[MG_NENTITIES-1]; cp >= mg_ename[0]; |
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cp -= sizeof(mg_ename[0])) |
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lu_find(&ent_tab, cp)->key = cp; |
| 196 |
} |
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cp = lu_find(&ent_tab, name)->key; |
| 198 |
if (cp == NULL) |
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return(-1); |
| 200 |
return((cp - mg_ename[0])/sizeof(mg_ename[0])); |
| 201 |
} |
| 202 |
|
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|
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int |
| 205 |
mg_handle( /* pass entity to appropriate handler */ |
| 206 |
register int en, |
| 207 |
int ac, |
| 208 |
char **av |
| 209 |
) |
| 210 |
{ |
| 211 |
int rv; |
| 212 |
|
| 213 |
if (en < 0 && (en = mg_entity(av[0])) < 0) { /* unknown entity */ |
| 214 |
if (mg_uhand != NULL) |
| 215 |
return((*mg_uhand)(ac, av)); |
| 216 |
return(MG_EUNK); |
| 217 |
} |
| 218 |
if (e_supp[en] != NULL) { /* support handler */ |
| 219 |
if ((rv = (*e_supp[en])(ac, av)) != MG_OK) |
| 220 |
return(rv); |
| 221 |
} |
| 222 |
return((*mg_ehand[en])(ac, av)); /* assigned handler */ |
| 223 |
} |
| 224 |
|
| 225 |
|
| 226 |
int |
| 227 |
mg_open( /* open new input file */ |
| 228 |
register MG_FCTXT *ctx, |
| 229 |
char *fn |
| 230 |
) |
| 231 |
{ |
| 232 |
static int nfids; |
| 233 |
register char *cp; |
| 234 |
|
| 235 |
ctx->fid = ++nfids; |
| 236 |
ctx->lineno = 0; |
| 237 |
if (fn == NULL) { |
| 238 |
strcpy(ctx->fname, "<stdin>"); |
| 239 |
ctx->fp = stdin; |
| 240 |
ctx->prev = mg_file; |
| 241 |
mg_file = ctx; |
| 242 |
return(MG_OK); |
| 243 |
} |
| 244 |
/* get name relative to this context */ |
| 245 |
if (fn[0] != '/' && mg_file != NULL && |
| 246 |
(cp = strrchr(mg_file->fname, '/')) != NULL) { |
| 247 |
strcpy(ctx->fname, mg_file->fname); |
| 248 |
strcpy(ctx->fname+(cp-mg_file->fname+1), fn); |
| 249 |
} else |
| 250 |
strcpy(ctx->fname, fn); |
| 251 |
ctx->fp = fopen(ctx->fname, "r"); |
| 252 |
if (ctx->fp == NULL) |
| 253 |
return(MG_ENOFILE); |
| 254 |
ctx->prev = mg_file; /* establish new context */ |
| 255 |
mg_file = ctx; |
| 256 |
return(MG_OK); |
| 257 |
} |
| 258 |
|
| 259 |
|
| 260 |
void |
| 261 |
mg_close(void) /* close input file */ |
| 262 |
{ |
| 263 |
register MG_FCTXT *ctx = mg_file; |
| 264 |
|
| 265 |
mg_file = ctx->prev; /* restore enclosing context */ |
| 266 |
if (ctx->fp != stdin) /* close file if it's a file */ |
| 267 |
fclose(ctx->fp); |
| 268 |
} |
| 269 |
|
| 270 |
|
| 271 |
void |
| 272 |
mg_fgetpos( /* get current position in input file */ |
| 273 |
register MG_FPOS *pos |
| 274 |
) |
| 275 |
{ |
| 276 |
pos->fid = mg_file->fid; |
| 277 |
pos->lineno = mg_file->lineno; |
| 278 |
pos->offset = ftell(mg_file->fp); |
| 279 |
} |
| 280 |
|
| 281 |
|
| 282 |
int |
| 283 |
mg_fgoto( /* reposition input file pointer */ |
| 284 |
register MG_FPOS *pos |
| 285 |
) |
| 286 |
{ |
| 287 |
if (pos->fid != mg_file->fid) |
| 288 |
return(MG_ESEEK); |
| 289 |
if (pos->lineno == mg_file->lineno) |
| 290 |
return(MG_OK); |
| 291 |
if (mg_file->fp == stdin) |
| 292 |
return(MG_ESEEK); /* cannot seek on standard input */ |
| 293 |
if (fseek(mg_file->fp, pos->offset, 0) == EOF) |
| 294 |
return(MG_ESEEK); |
| 295 |
mg_file->lineno = pos->lineno; |
| 296 |
return(MG_OK); |
| 297 |
} |
| 298 |
|
| 299 |
|
| 300 |
int |
| 301 |
mg_read(void) /* read next line from file */ |
| 302 |
{ |
| 303 |
register int len = 0; |
| 304 |
|
| 305 |
do { |
| 306 |
if (fgets(mg_file->inpline+len, |
| 307 |
MG_MAXLINE-len, mg_file->fp) == NULL) |
| 308 |
return(len); |
| 309 |
len += strlen(mg_file->inpline+len); |
| 310 |
if (len >= MG_MAXLINE-1) |
| 311 |
return(len); |
| 312 |
mg_file->lineno++; |
| 313 |
} while (len > 1 && mg_file->inpline[len-2] == '\\'); |
| 314 |
|
| 315 |
return(len); |
| 316 |
} |
| 317 |
|
| 318 |
|
| 319 |
int |
| 320 |
mg_parse(void) /* parse current input line */ |
| 321 |
{ |
| 322 |
char abuf[MG_MAXLINE]; |
| 323 |
char *argv[MG_MAXARGC]; |
| 324 |
register char *cp, *cp2, **ap; |
| 325 |
/* copy line, removing escape chars */ |
| 326 |
cp = abuf; cp2 = mg_file->inpline; |
| 327 |
while ((*cp++ = *cp2++)) |
| 328 |
if (cp2[0] == '\n' && cp2[-1] == '\\') |
| 329 |
cp--; |
| 330 |
cp = abuf; ap = argv; /* break into words */ |
| 331 |
for ( ; ; ) { |
| 332 |
while (isspace(*cp)) |
| 333 |
*cp++ = '\0'; |
| 334 |
if (!*cp) |
| 335 |
break; |
| 336 |
if (ap - argv >= MG_MAXARGC-1) |
| 337 |
return(MG_EARGC); |
| 338 |
*ap++ = cp; |
| 339 |
while (*++cp && !isspace(*cp)) |
| 340 |
; |
| 341 |
} |
| 342 |
if (ap == argv) |
| 343 |
return(MG_OK); /* no words in line */ |
| 344 |
*ap = NULL; |
| 345 |
/* else handle it */ |
| 346 |
return(mg_handle(-1, ap-argv, argv)); |
| 347 |
} |
| 348 |
|
| 349 |
|
| 350 |
int |
| 351 |
mg_load( /* load an MGF file */ |
| 352 |
char *fn |
| 353 |
) |
| 354 |
{ |
| 355 |
MG_FCTXT cntxt; |
| 356 |
int rval; |
| 357 |
register int nbr; |
| 358 |
|
| 359 |
if ((rval = mg_open(&cntxt, fn)) != MG_OK) { |
| 360 |
fprintf(stderr, "%s: %s\n", fn, mg_err[rval]); |
| 361 |
return(rval); |
| 362 |
} |
| 363 |
while ((nbr = mg_read()) > 0) { /* parse each line */ |
| 364 |
if (nbr >= MG_MAXLINE-1) { |
| 365 |
fprintf(stderr, "%s: %d: %s\n", cntxt.fname, |
| 366 |
cntxt.lineno, mg_err[rval=MG_ELINE]); |
| 367 |
break; |
| 368 |
} |
| 369 |
if ((rval = mg_parse()) != MG_OK) { |
| 370 |
fprintf(stderr, "%s: %d: %s:\n%s", cntxt.fname, |
| 371 |
cntxt.lineno, mg_err[rval], |
| 372 |
cntxt.inpline); |
| 373 |
break; |
| 374 |
} |
| 375 |
} |
| 376 |
mg_close(); |
| 377 |
return(rval); |
| 378 |
} |
| 379 |
|
| 380 |
|
| 381 |
int |
| 382 |
mg_defuhand( /* default handler for unknown entities */ |
| 383 |
int ac, |
| 384 |
char **av |
| 385 |
) |
| 386 |
{ |
| 387 |
if (mg_nunknown++ == 0) /* report first incident */ |
| 388 |
fprintf(stderr, "%s: %d: %s: %s\n", mg_file->fname, |
| 389 |
mg_file->lineno, mg_err[MG_EUNK], av[0]); |
| 390 |
return(MG_OK); |
| 391 |
} |
| 392 |
|
| 393 |
|
| 394 |
void |
| 395 |
mg_clear(void) /* clear parser history */ |
| 396 |
{ |
| 397 |
c_clearall(); /* clear context tables */ |
| 398 |
while (mg_file != NULL) /* reset our file context */ |
| 399 |
mg_close(); |
| 400 |
} |
| 401 |
|
| 402 |
|
| 403 |
/**************************************************************************** |
| 404 |
* The following routines handle unsupported entities |
| 405 |
*/ |
| 406 |
|
| 407 |
|
| 408 |
static int |
| 409 |
e_any_toss( /* discard an unwanted entity */ |
| 410 |
int ac, |
| 411 |
char **av |
| 412 |
) |
| 413 |
{ |
| 414 |
return(MG_OK); |
| 415 |
} |
| 416 |
|
| 417 |
|
| 418 |
int |
| 419 |
e_include( /* include file */ |
| 420 |
int ac, |
| 421 |
char **av |
| 422 |
) |
| 423 |
{ |
| 424 |
char *xfarg[MG_MAXARGC]; |
| 425 |
MG_FCTXT ictx; |
| 426 |
XF_SPEC *xf_orig = xf_context; |
| 427 |
register int rv; |
| 428 |
|
| 429 |
if (ac < 2) |
| 430 |
return(MG_EARGC); |
| 431 |
if ((rv = mg_open(&ictx, av[1])) != MG_OK) |
| 432 |
return(rv); |
| 433 |
if (ac > 2) { |
| 434 |
register int i; |
| 435 |
|
| 436 |
xfarg[0] = mg_ename[MG_E_XF]; |
| 437 |
for (i = 1; i < ac-1; i++) |
| 438 |
xfarg[i] = av[i+1]; |
| 439 |
xfarg[ac-1] = NULL; |
| 440 |
if ((rv = mg_handle(MG_E_XF, ac-1, xfarg)) != MG_OK) { |
| 441 |
mg_close(); |
| 442 |
return(rv); |
| 443 |
} |
| 444 |
} |
| 445 |
do { |
| 446 |
while ((rv = mg_read()) > 0) { |
| 447 |
if (rv >= MG_MAXLINE-1) { |
| 448 |
fprintf(stderr, "%s: %d: %s\n", ictx.fname, |
| 449 |
ictx.lineno, mg_err[MG_ELINE]); |
| 450 |
mg_close(); |
| 451 |
return(MG_EINCL); |
| 452 |
} |
| 453 |
if ((rv = mg_parse()) != MG_OK) { |
| 454 |
fprintf(stderr, "%s: %d: %s:\n%s", ictx.fname, |
| 455 |
ictx.lineno, mg_err[rv], |
| 456 |
ictx.inpline); |
| 457 |
mg_close(); |
| 458 |
return(MG_EINCL); |
| 459 |
} |
| 460 |
} |
| 461 |
if (ac > 2) |
| 462 |
if ((rv = mg_handle(MG_E_XF, 1, xfarg)) != MG_OK) { |
| 463 |
mg_close(); |
| 464 |
return(rv); |
| 465 |
} |
| 466 |
} while (xf_context != xf_orig); |
| 467 |
mg_close(); |
| 468 |
return(MG_OK); |
| 469 |
} |
| 470 |
|
| 471 |
|
| 472 |
int |
| 473 |
e_faceh( /* replace face+holes with single contour */ |
| 474 |
int ac, |
| 475 |
char **av |
| 476 |
) |
| 477 |
{ |
| 478 |
char *newav[MG_MAXARGC]; |
| 479 |
int lastp = 0; |
| 480 |
register int i, j; |
| 481 |
|
| 482 |
newav[0] = mg_ename[MG_E_FACE]; |
| 483 |
for (i = 1; i < ac; i++) |
| 484 |
if (av[i][0] == '-') { |
| 485 |
if (i < 4) |
| 486 |
return(MG_EARGC); |
| 487 |
if (i >= ac-1) |
| 488 |
break; |
| 489 |
if (!lastp) |
| 490 |
lastp = i-1; |
| 491 |
for (j = i+1; j < ac-1 && av[j+1][0] != '-'; j++) |
| 492 |
; |
| 493 |
if (j - i < 3) |
| 494 |
return(MG_EARGC); |
| 495 |
newav[i] = av[j]; /* connect hole loop */ |
| 496 |
} else |
| 497 |
newav[i] = av[i]; /* hole or perimeter vertex */ |
| 498 |
if (lastp) |
| 499 |
newav[i++] = av[lastp]; /* finish seam to outside */ |
| 500 |
newav[i] = NULL; |
| 501 |
return(mg_handle(MG_E_FACE, i, newav)); |
| 502 |
} |
| 503 |
|
| 504 |
|
| 505 |
static void |
| 506 |
make_axes( /* compute u and v given w (normalized) */ |
| 507 |
FVECT u, |
| 508 |
FVECT v, |
| 509 |
FVECT w |
| 510 |
) |
| 511 |
{ |
| 512 |
register int i; |
| 513 |
|
| 514 |
v[0] = v[1] = v[2] = 0.; |
| 515 |
for (i = 0; i < 3; i++) |
| 516 |
if (w[i] < .6 && w[i] > -.6) |
| 517 |
break; |
| 518 |
v[i] = 1.; |
| 519 |
fcross(u, v, w); |
| 520 |
normalize(u); |
| 521 |
fcross(v, w, u); |
| 522 |
} |
| 523 |
|
| 524 |
|
| 525 |
int |
| 526 |
e_sph( /* expand a sphere into cones */ |
| 527 |
int ac, |
| 528 |
char **av |
| 529 |
) |
| 530 |
{ |
| 531 |
static char p2x[24], p2y[24], p2z[24], r1[24], r2[24]; |
| 532 |
static char *v1ent[5] = {mg_ename[MG_E_VERTEX],"_sv1","=","_sv2"}; |
| 533 |
static char *v2ent[4] = {mg_ename[MG_E_VERTEX],"_sv2","="}; |
| 534 |
static char *p2ent[5] = {mg_ename[MG_E_POINT],p2x,p2y,p2z}; |
| 535 |
static char *conent[6] = {mg_ename[MG_E_CONE],"_sv1",r1,"_sv2",r2}; |
| 536 |
register C_VERTEX *cv; |
| 537 |
register int i; |
| 538 |
int rval; |
| 539 |
double rad; |
| 540 |
double theta; |
| 541 |
|
| 542 |
if (ac != 3) |
| 543 |
return(MG_EARGC); |
| 544 |
if ((cv = c_getvert(av[1])) == NULL) |
| 545 |
return(MG_EUNDEF); |
| 546 |
if (!isflt(av[2])) |
| 547 |
return(MG_ETYPE); |
| 548 |
rad = atof(av[2]); |
| 549 |
/* initialize */ |
| 550 |
warpconends = 1; |
| 551 |
if ((rval = mg_handle(MG_E_VERTEX, 3, v2ent)) != MG_OK) |
| 552 |
return(rval); |
| 553 |
sprintf(p2x, FLTFMT, cv->p[0]); |
| 554 |
sprintf(p2y, FLTFMT, cv->p[1]); |
| 555 |
sprintf(p2z, FLTFMT, cv->p[2]+rad); |
| 556 |
if ((rval = mg_handle(MG_E_POINT, 4, p2ent)) != MG_OK) |
| 557 |
return(rval); |
| 558 |
r2[0] = '0'; r2[1] = '\0'; |
| 559 |
for (i = 1; i <= 2*mg_nqcdivs; i++) { |
| 560 |
theta = i*(PI/2)/mg_nqcdivs; |
| 561 |
if ((rval = mg_handle(MG_E_VERTEX, 4, v1ent)) != MG_OK) |
| 562 |
return(rval); |
| 563 |
sprintf(p2z, FLTFMT, cv->p[2]+rad*cos(theta)); |
| 564 |
if ((rval = mg_handle(MG_E_VERTEX, 2, v2ent)) != MG_OK) |
| 565 |
return(rval); |
| 566 |
if ((rval = mg_handle(MG_E_POINT, 4, p2ent)) != MG_OK) |
| 567 |
return(rval); |
| 568 |
strcpy(r1, r2); |
| 569 |
sprintf(r2, FLTFMT, rad*sin(theta)); |
| 570 |
if ((rval = mg_handle(MG_E_CONE, 5, conent)) != MG_OK) |
| 571 |
return(rval); |
| 572 |
} |
| 573 |
warpconends = 0; |
| 574 |
return(MG_OK); |
| 575 |
} |
| 576 |
|
| 577 |
|
| 578 |
int |
| 579 |
e_torus( /* expand a torus into cones */ |
| 580 |
int ac, |
| 581 |
char **av |
| 582 |
) |
| 583 |
{ |
| 584 |
static char p2[3][24], r1[24], r2[24]; |
| 585 |
static char *v1ent[5] = {mg_ename[MG_E_VERTEX],"_tv1","=","_tv2"}; |
| 586 |
static char *v2ent[5] = {mg_ename[MG_E_VERTEX],"_tv2","="}; |
| 587 |
static char *p2ent[5] = {mg_ename[MG_E_POINT],p2[0],p2[1],p2[2]}; |
| 588 |
static char *conent[6] = {mg_ename[MG_E_CONE],"_tv1",r1,"_tv2",r2}; |
| 589 |
register C_VERTEX *cv; |
| 590 |
register int i, j; |
| 591 |
int rval; |
| 592 |
int sgn; |
| 593 |
double minrad, maxrad, avgrad; |
| 594 |
double theta; |
| 595 |
|
| 596 |
if (ac != 4) |
| 597 |
return(MG_EARGC); |
| 598 |
if ((cv = c_getvert(av[1])) == NULL) |
| 599 |
return(MG_EUNDEF); |
| 600 |
if (is0vect(cv->n)) |
| 601 |
return(MG_EILL); |
| 602 |
if (!isflt(av[2]) || !isflt(av[3])) |
| 603 |
return(MG_ETYPE); |
| 604 |
minrad = atof(av[2]); |
| 605 |
round0(minrad); |
| 606 |
maxrad = atof(av[3]); |
| 607 |
/* check orientation */ |
| 608 |
if (minrad > 0.) |
| 609 |
sgn = 1; |
| 610 |
else if (minrad < 0.) |
| 611 |
sgn = -1; |
| 612 |
else if (maxrad > 0.) |
| 613 |
sgn = 1; |
| 614 |
else if (maxrad < 0.) |
| 615 |
sgn = -1; |
| 616 |
else |
| 617 |
return(MG_EILL); |
| 618 |
if (sgn*(maxrad-minrad) <= 0.) |
| 619 |
return(MG_EILL); |
| 620 |
/* initialize */ |
| 621 |
warpconends = 1; |
| 622 |
v2ent[3] = av[1]; |
| 623 |
for (j = 0; j < 3; j++) |
| 624 |
sprintf(p2[j], FLTFMT, cv->p[j] + |
| 625 |
.5*sgn*(maxrad-minrad)*cv->n[j]); |
| 626 |
if ((rval = mg_handle(MG_E_VERTEX, 4, v2ent)) != MG_OK) |
| 627 |
return(rval); |
| 628 |
if ((rval = mg_handle(MG_E_POINT, 4, p2ent)) != MG_OK) |
| 629 |
return(rval); |
| 630 |
sprintf(r2, FLTFMT, avgrad=.5*(minrad+maxrad)); |
| 631 |
/* run outer section */ |
| 632 |
for (i = 1; i <= 2*mg_nqcdivs; i++) { |
| 633 |
theta = i*(PI/2)/mg_nqcdivs; |
| 634 |
if ((rval = mg_handle(MG_E_VERTEX, 4, v1ent)) != MG_OK) |
| 635 |
return(rval); |
| 636 |
for (j = 0; j < 3; j++) |
| 637 |
sprintf(p2[j], FLTFMT, cv->p[j] + |
| 638 |
.5*sgn*(maxrad-minrad)*cos(theta)*cv->n[j]); |
| 639 |
if ((rval = mg_handle(MG_E_VERTEX, 2, v2ent)) != MG_OK) |
| 640 |
return(rval); |
| 641 |
if ((rval = mg_handle(MG_E_POINT, 4, p2ent)) != MG_OK) |
| 642 |
return(rval); |
| 643 |
strcpy(r1, r2); |
| 644 |
sprintf(r2, FLTFMT, avgrad + .5*(maxrad-minrad)*sin(theta)); |
| 645 |
if ((rval = mg_handle(MG_E_CONE, 5, conent)) != MG_OK) |
| 646 |
return(rval); |
| 647 |
} |
| 648 |
/* run inner section */ |
| 649 |
sprintf(r2, FLTFMT, -.5*(minrad+maxrad)); |
| 650 |
for ( ; i <= 4*mg_nqcdivs; i++) { |
| 651 |
theta = i*(PI/2)/mg_nqcdivs; |
| 652 |
for (j = 0; j < 3; j++) |
| 653 |
sprintf(p2[j], FLTFMT, cv->p[j] + |
| 654 |
.5*sgn*(maxrad-minrad)*cos(theta)*cv->n[j]); |
| 655 |
if ((rval = mg_handle(MG_E_VERTEX, 4, v1ent)) != MG_OK) |
| 656 |
return(rval); |
| 657 |
if ((rval = mg_handle(MG_E_VERTEX, 2, v2ent)) != MG_OK) |
| 658 |
return(rval); |
| 659 |
if ((rval = mg_handle(MG_E_POINT, 4, p2ent)) != MG_OK) |
| 660 |
return(rval); |
| 661 |
strcpy(r1, r2); |
| 662 |
sprintf(r2, FLTFMT, -avgrad - .5*(maxrad-minrad)*sin(theta)); |
| 663 |
if ((rval = mg_handle(MG_E_CONE, 5, conent)) != MG_OK) |
| 664 |
return(rval); |
| 665 |
} |
| 666 |
warpconends = 0; |
| 667 |
return(MG_OK); |
| 668 |
} |
| 669 |
|
| 670 |
|
| 671 |
int |
| 672 |
e_cyl( /* replace a cylinder with equivalent cone */ |
| 673 |
int ac, |
| 674 |
char **av |
| 675 |
) |
| 676 |
{ |
| 677 |
static char *avnew[6] = {mg_ename[MG_E_CONE]}; |
| 678 |
|
| 679 |
if (ac != 4) |
| 680 |
return(MG_EARGC); |
| 681 |
avnew[1] = av[1]; |
| 682 |
avnew[2] = av[2]; |
| 683 |
avnew[3] = av[3]; |
| 684 |
avnew[4] = av[2]; |
| 685 |
return(mg_handle(MG_E_CONE, 5, avnew)); |
| 686 |
} |
| 687 |
|
| 688 |
|
| 689 |
int |
| 690 |
e_ring( /* turn a ring into polygons */ |
| 691 |
int ac, |
| 692 |
char **av |
| 693 |
) |
| 694 |
{ |
| 695 |
static char p3[3][24], p4[3][24]; |
| 696 |
static char *nzent[5] = {mg_ename[MG_E_NORMAL],"0","0","0"}; |
| 697 |
static char *v1ent[5] = {mg_ename[MG_E_VERTEX],"_rv1","="}; |
| 698 |
static char *v2ent[5] = {mg_ename[MG_E_VERTEX],"_rv2","=","_rv3"}; |
| 699 |
static char *v3ent[4] = {mg_ename[MG_E_VERTEX],"_rv3","="}; |
| 700 |
static char *p3ent[5] = {mg_ename[MG_E_POINT],p3[0],p3[1],p3[2]}; |
| 701 |
static char *v4ent[4] = {mg_ename[MG_E_VERTEX],"_rv4","="}; |
| 702 |
static char *p4ent[5] = {mg_ename[MG_E_POINT],p4[0],p4[1],p4[2]}; |
| 703 |
static char *fent[6] = {mg_ename[MG_E_FACE],"_rv1","_rv2","_rv3","_rv4"}; |
| 704 |
register C_VERTEX *cv; |
| 705 |
register int i, j; |
| 706 |
FVECT u, v; |
| 707 |
double minrad, maxrad; |
| 708 |
int rv; |
| 709 |
double theta, d; |
| 710 |
|
| 711 |
if (ac != 4) |
| 712 |
return(MG_EARGC); |
| 713 |
if ((cv = c_getvert(av[1])) == NULL) |
| 714 |
return(MG_EUNDEF); |
| 715 |
if (is0vect(cv->n)) |
| 716 |
return(MG_EILL); |
| 717 |
if (!isflt(av[2]) || !isflt(av[3])) |
| 718 |
return(MG_ETYPE); |
| 719 |
minrad = atof(av[2]); |
| 720 |
round0(minrad); |
| 721 |
maxrad = atof(av[3]); |
| 722 |
if (minrad < 0. || maxrad <= minrad) |
| 723 |
return(MG_EILL); |
| 724 |
/* initialize */ |
| 725 |
make_axes(u, v, cv->n); |
| 726 |
for (j = 0; j < 3; j++) |
| 727 |
sprintf(p3[j], FLTFMT, cv->p[j] + maxrad*u[j]); |
| 728 |
if ((rv = mg_handle(MG_E_VERTEX, 3, v3ent)) != MG_OK) |
| 729 |
return(rv); |
| 730 |
if ((rv = mg_handle(MG_E_POINT, 4, p3ent)) != MG_OK) |
| 731 |
return(rv); |
| 732 |
if (minrad == 0.) { /* closed */ |
| 733 |
v1ent[3] = av[1]; |
| 734 |
if ((rv = mg_handle(MG_E_VERTEX, 4, v1ent)) != MG_OK) |
| 735 |
return(rv); |
| 736 |
if ((rv = mg_handle(MG_E_NORMAL, 4, nzent)) != MG_OK) |
| 737 |
return(rv); |
| 738 |
for (i = 1; i <= 4*mg_nqcdivs; i++) { |
| 739 |
theta = i*(PI/2)/mg_nqcdivs; |
| 740 |
if ((rv = mg_handle(MG_E_VERTEX, 4, v2ent)) != MG_OK) |
| 741 |
return(rv); |
| 742 |
for (j = 0; j < 3; j++) |
| 743 |
sprintf(p3[j], FLTFMT, cv->p[j] + |
| 744 |
maxrad*u[j]*cos(theta) + |
| 745 |
maxrad*v[j]*sin(theta)); |
| 746 |
if ((rv = mg_handle(MG_E_VERTEX, 2, v3ent)) != MG_OK) |
| 747 |
return(rv); |
| 748 |
if ((rv = mg_handle(MG_E_POINT, 4, p3ent)) != MG_OK) |
| 749 |
return(rv); |
| 750 |
if ((rv = mg_handle(MG_E_FACE, 4, fent)) != MG_OK) |
| 751 |
return(rv); |
| 752 |
} |
| 753 |
} else { /* open */ |
| 754 |
if ((rv = mg_handle(MG_E_VERTEX, 3, v4ent)) != MG_OK) |
| 755 |
return(rv); |
| 756 |
for (j = 0; j < 3; j++) |
| 757 |
sprintf(p4[j], FLTFMT, cv->p[j] + minrad*u[j]); |
| 758 |
if ((rv = mg_handle(MG_E_POINT, 4, p4ent)) != MG_OK) |
| 759 |
return(rv); |
| 760 |
v1ent[3] = "_rv4"; |
| 761 |
for (i = 1; i <= 4*mg_nqcdivs; i++) { |
| 762 |
theta = i*(PI/2)/mg_nqcdivs; |
| 763 |
if ((rv = mg_handle(MG_E_VERTEX, 4, v1ent)) != MG_OK) |
| 764 |
return(rv); |
| 765 |
if ((rv = mg_handle(MG_E_VERTEX, 4, v2ent)) != MG_OK) |
| 766 |
return(rv); |
| 767 |
for (j = 0; j < 3; j++) { |
| 768 |
d = u[j]*cos(theta) + v[j]*sin(theta); |
| 769 |
sprintf(p3[j], FLTFMT, cv->p[j] + maxrad*d); |
| 770 |
sprintf(p4[j], FLTFMT, cv->p[j] + minrad*d); |
| 771 |
} |
| 772 |
if ((rv = mg_handle(MG_E_VERTEX, 2, v3ent)) != MG_OK) |
| 773 |
return(rv); |
| 774 |
if ((rv = mg_handle(MG_E_POINT, 4, p3ent)) != MG_OK) |
| 775 |
return(rv); |
| 776 |
if ((rv = mg_handle(MG_E_VERTEX, 2, v4ent)) != MG_OK) |
| 777 |
return(rv); |
| 778 |
if ((rv = mg_handle(MG_E_POINT, 4, p4ent)) != MG_OK) |
| 779 |
return(rv); |
| 780 |
if ((rv = mg_handle(MG_E_FACE, 5, fent)) != MG_OK) |
| 781 |
return(rv); |
| 782 |
} |
| 783 |
} |
| 784 |
return(MG_OK); |
| 785 |
} |
| 786 |
|
| 787 |
|
| 788 |
int |
| 789 |
e_cone( /* turn a cone into polygons */ |
| 790 |
int ac, |
| 791 |
char **av |
| 792 |
) |
| 793 |
{ |
| 794 |
static char p3[3][24], p4[3][24], n3[3][24], n4[3][24]; |
| 795 |
static char *v1ent[5] = {mg_ename[MG_E_VERTEX],"_cv1","="}; |
| 796 |
static char *v2ent[5] = {mg_ename[MG_E_VERTEX],"_cv2","=","_cv3"}; |
| 797 |
static char *v3ent[4] = {mg_ename[MG_E_VERTEX],"_cv3","="}; |
| 798 |
static char *p3ent[5] = {mg_ename[MG_E_POINT],p3[0],p3[1],p3[2]}; |
| 799 |
static char *n3ent[5] = {mg_ename[MG_E_NORMAL],n3[0],n3[1],n3[2]}; |
| 800 |
static char *v4ent[4] = {mg_ename[MG_E_VERTEX],"_cv4","="}; |
| 801 |
static char *p4ent[5] = {mg_ename[MG_E_POINT],p4[0],p4[1],p4[2]}; |
| 802 |
static char *n4ent[5] = {mg_ename[MG_E_NORMAL],n4[0],n4[1],n4[2]}; |
| 803 |
static char *fent[6] = {mg_ename[MG_E_FACE],"_cv1","_cv2","_cv3","_cv4"}; |
| 804 |
char *v1n; |
| 805 |
register C_VERTEX *cv1, *cv2; |
| 806 |
register int i, j; |
| 807 |
FVECT u, v, w; |
| 808 |
double rad1, rad2; |
| 809 |
int sgn; |
| 810 |
double n1off, n2off; |
| 811 |
double d; |
| 812 |
int rv; |
| 813 |
double theta; |
| 814 |
|
| 815 |
if (ac != 5) |
| 816 |
return(MG_EARGC); |
| 817 |
if ((cv1 = c_getvert(av[1])) == NULL || |
| 818 |
(cv2 = c_getvert(av[3])) == NULL) |
| 819 |
return(MG_EUNDEF); |
| 820 |
v1n = av[1]; |
| 821 |
if (!isflt(av[2]) || !isflt(av[4])) |
| 822 |
return(MG_ETYPE); |
| 823 |
rad1 = atof(av[2]); |
| 824 |
round0(rad1); |
| 825 |
rad2 = atof(av[4]); |
| 826 |
round0(rad2); |
| 827 |
if (rad1 == 0.) { |
| 828 |
if (rad2 == 0.) |
| 829 |
return(MG_EILL); |
| 830 |
} else if (rad2 != 0.) { |
| 831 |
if ((rad1 < 0.) ^ (rad2 < 0.)) |
| 832 |
return(MG_EILL); |
| 833 |
} else { /* swap */ |
| 834 |
C_VERTEX *cv; |
| 835 |
|
| 836 |
cv = cv1; |
| 837 |
cv1 = cv2; |
| 838 |
cv2 = cv; |
| 839 |
v1n = av[3]; |
| 840 |
d = rad1; |
| 841 |
rad1 = rad2; |
| 842 |
rad2 = d; |
| 843 |
} |
| 844 |
sgn = rad2 < 0. ? -1 : 1; |
| 845 |
/* initialize */ |
| 846 |
for (j = 0; j < 3; j++) |
| 847 |
w[j] = cv1->p[j] - cv2->p[j]; |
| 848 |
if ((d = normalize(w)) == 0.) |
| 849 |
return(MG_EILL); |
| 850 |
n1off = n2off = (rad2 - rad1)/d; |
| 851 |
if (warpconends) { /* hack for e_sph and e_torus */ |
| 852 |
d = atan(n2off) - (PI/4)/mg_nqcdivs; |
| 853 |
if (d <= -PI/2+FTINY) |
| 854 |
n2off = -FHUGE; |
| 855 |
else |
| 856 |
n2off = tan(d); |
| 857 |
} |
| 858 |
make_axes(u, v, w); |
| 859 |
for (j = 0; j < 3; j++) { |
| 860 |
sprintf(p3[j], FLTFMT, cv2->p[j] + rad2*u[j]); |
| 861 |
if (n2off <= -FHUGE) |
| 862 |
sprintf(n3[j], FLTFMT, -w[j]); |
| 863 |
else |
| 864 |
sprintf(n3[j], FLTFMT, u[j] + w[j]*n2off); |
| 865 |
} |
| 866 |
if ((rv = mg_handle(MG_E_VERTEX, 3, v3ent)) != MG_OK) |
| 867 |
return(rv); |
| 868 |
if ((rv = mg_handle(MG_E_POINT, 4, p3ent)) != MG_OK) |
| 869 |
return(rv); |
| 870 |
if ((rv = mg_handle(MG_E_NORMAL, 4, n3ent)) != MG_OK) |
| 871 |
return(rv); |
| 872 |
if (rad1 == 0.) { /* triangles */ |
| 873 |
v1ent[3] = v1n; |
| 874 |
if ((rv = mg_handle(MG_E_VERTEX, 4, v1ent)) != MG_OK) |
| 875 |
return(rv); |
| 876 |
for (j = 0; j < 3; j++) |
| 877 |
sprintf(n4[j], FLTFMT, w[j]); |
| 878 |
if ((rv = mg_handle(MG_E_NORMAL, 4, n4ent)) != MG_OK) |
| 879 |
return(rv); |
| 880 |
for (i = 1; i <= 4*mg_nqcdivs; i++) { |
| 881 |
theta = sgn*i*(PI/2)/mg_nqcdivs; |
| 882 |
if ((rv = mg_handle(MG_E_VERTEX, 4, v2ent)) != MG_OK) |
| 883 |
return(rv); |
| 884 |
for (j = 0; j < 3; j++) { |
| 885 |
d = u[j]*cos(theta) + v[j]*sin(theta); |
| 886 |
sprintf(p3[j], FLTFMT, cv2->p[j] + rad2*d); |
| 887 |
if (n2off > -FHUGE) |
| 888 |
sprintf(n3[j], FLTFMT, d + w[j]*n2off); |
| 889 |
} |
| 890 |
if ((rv = mg_handle(MG_E_VERTEX, 2, v3ent)) != MG_OK) |
| 891 |
return(rv); |
| 892 |
if ((rv = mg_handle(MG_E_POINT, 4, p3ent)) != MG_OK) |
| 893 |
return(rv); |
| 894 |
if (n2off > -FHUGE && |
| 895 |
(rv = mg_handle(MG_E_NORMAL, 4, n3ent)) != MG_OK) |
| 896 |
return(rv); |
| 897 |
if ((rv = mg_handle(MG_E_FACE, 4, fent)) != MG_OK) |
| 898 |
return(rv); |
| 899 |
} |
| 900 |
} else { /* quads */ |
| 901 |
v1ent[3] = "_cv4"; |
| 902 |
if (warpconends) { /* hack for e_sph and e_torus */ |
| 903 |
d = atan(n1off) + (PI/4)/mg_nqcdivs; |
| 904 |
if (d >= PI/2-FTINY) |
| 905 |
n1off = FHUGE; |
| 906 |
else |
| 907 |
n1off = tan(atan(n1off)+(PI/4)/mg_nqcdivs); |
| 908 |
} |
| 909 |
for (j = 0; j < 3; j++) { |
| 910 |
sprintf(p4[j], FLTFMT, cv1->p[j] + rad1*u[j]); |
| 911 |
if (n1off >= FHUGE) |
| 912 |
sprintf(n4[j], FLTFMT, w[j]); |
| 913 |
else |
| 914 |
sprintf(n4[j], FLTFMT, u[j] + w[j]*n1off); |
| 915 |
} |
| 916 |
if ((rv = mg_handle(MG_E_VERTEX, 3, v4ent)) != MG_OK) |
| 917 |
return(rv); |
| 918 |
if ((rv = mg_handle(MG_E_POINT, 4, p4ent)) != MG_OK) |
| 919 |
return(rv); |
| 920 |
if ((rv = mg_handle(MG_E_NORMAL, 4, n4ent)) != MG_OK) |
| 921 |
return(rv); |
| 922 |
for (i = 1; i <= 4*mg_nqcdivs; i++) { |
| 923 |
theta = sgn*i*(PI/2)/mg_nqcdivs; |
| 924 |
if ((rv = mg_handle(MG_E_VERTEX, 4, v1ent)) != MG_OK) |
| 925 |
return(rv); |
| 926 |
if ((rv = mg_handle(MG_E_VERTEX, 4, v2ent)) != MG_OK) |
| 927 |
return(rv); |
| 928 |
for (j = 0; j < 3; j++) { |
| 929 |
d = u[j]*cos(theta) + v[j]*sin(theta); |
| 930 |
sprintf(p3[j], FLTFMT, cv2->p[j] + rad2*d); |
| 931 |
if (n2off > -FHUGE) |
| 932 |
sprintf(n3[j], FLTFMT, d + w[j]*n2off); |
| 933 |
sprintf(p4[j], FLTFMT, cv1->p[j] + rad1*d); |
| 934 |
if (n1off < FHUGE) |
| 935 |
sprintf(n4[j], FLTFMT, d + w[j]*n1off); |
| 936 |
} |
| 937 |
if ((rv = mg_handle(MG_E_VERTEX, 2, v3ent)) != MG_OK) |
| 938 |
return(rv); |
| 939 |
if ((rv = mg_handle(MG_E_POINT, 4, p3ent)) != MG_OK) |
| 940 |
return(rv); |
| 941 |
if (n2off > -FHUGE && |
| 942 |
(rv = mg_handle(MG_E_NORMAL, 4, n3ent)) != MG_OK) |
| 943 |
return(rv); |
| 944 |
if ((rv = mg_handle(MG_E_VERTEX, 2, v4ent)) != MG_OK) |
| 945 |
return(rv); |
| 946 |
if ((rv = mg_handle(MG_E_POINT, 4, p4ent)) != MG_OK) |
| 947 |
return(rv); |
| 948 |
if (n1off < FHUGE && |
| 949 |
(rv = mg_handle(MG_E_NORMAL, 4, n4ent)) != MG_OK) |
| 950 |
return(rv); |
| 951 |
if ((rv = mg_handle(MG_E_FACE, 5, fent)) != MG_OK) |
| 952 |
return(rv); |
| 953 |
} |
| 954 |
} |
| 955 |
return(MG_OK); |
| 956 |
} |
| 957 |
|
| 958 |
|
| 959 |
int |
| 960 |
e_prism( /* turn a prism into polygons */ |
| 961 |
int ac, |
| 962 |
char **av |
| 963 |
) |
| 964 |
{ |
| 965 |
static char p[3][24]; |
| 966 |
static char *vent[5] = {mg_ename[MG_E_VERTEX],NULL,"="}; |
| 967 |
static char *pent[5] = {mg_ename[MG_E_POINT],p[0],p[1],p[2]}; |
| 968 |
static char *znorm[5] = {mg_ename[MG_E_NORMAL],"0","0","0"}; |
| 969 |
char *newav[MG_MAXARGC], nvn[MG_MAXARGC-1][8]; |
| 970 |
double length; |
| 971 |
int hasnorm; |
| 972 |
FVECT v1, v2, v3, norm; |
| 973 |
register C_VERTEX *cv; |
| 974 |
C_VERTEX *cv0; |
| 975 |
int rv; |
| 976 |
register int i, j; |
| 977 |
/* check arguments */ |
| 978 |
if (ac < 5) |
| 979 |
return(MG_EARGC); |
| 980 |
if (!isflt(av[ac-1])) |
| 981 |
return(MG_ETYPE); |
| 982 |
length = atof(av[ac-1]); |
| 983 |
if (length <= FTINY && length >= -FTINY) |
| 984 |
return(MG_EILL); |
| 985 |
/* compute face normal */ |
| 986 |
if ((cv0 = c_getvert(av[1])) == NULL) |
| 987 |
return(MG_EUNDEF); |
| 988 |
hasnorm = 0; |
| 989 |
norm[0] = norm[1] = norm[2] = 0.; |
| 990 |
v1[0] = v1[1] = v1[2] = 0.; |
| 991 |
for (i = 2; i < ac-1; i++) { |
| 992 |
if ((cv = c_getvert(av[i])) == NULL) |
| 993 |
return(MG_EUNDEF); |
| 994 |
hasnorm += !is0vect(cv->n); |
| 995 |
v2[0] = cv->p[0] - cv0->p[0]; |
| 996 |
v2[1] = cv->p[1] - cv0->p[1]; |
| 997 |
v2[2] = cv->p[2] - cv0->p[2]; |
| 998 |
fcross(v3, v1, v2); |
| 999 |
norm[0] += v3[0]; |
| 1000 |
norm[1] += v3[1]; |
| 1001 |
norm[2] += v3[2]; |
| 1002 |
VCOPY(v1, v2); |
| 1003 |
} |
| 1004 |
if (normalize(norm) == 0.) |
| 1005 |
return(MG_EILL); |
| 1006 |
/* create moved vertices */ |
| 1007 |
for (i = 1; i < ac-1; i++) { |
| 1008 |
sprintf(nvn[i-1], "_pv%d", i); |
| 1009 |
vent[1] = nvn[i-1]; |
| 1010 |
vent[3] = av[i]; |
| 1011 |
if ((rv = mg_handle(MG_E_VERTEX, 4, vent)) != MG_OK) |
| 1012 |
return(rv); |
| 1013 |
cv = c_getvert(av[i]); /* checked above */ |
| 1014 |
for (j = 0; j < 3; j++) |
| 1015 |
sprintf(p[j], FLTFMT, cv->p[j] - length*norm[j]); |
| 1016 |
if ((rv = mg_handle(MG_E_POINT, 4, pent)) != MG_OK) |
| 1017 |
return(rv); |
| 1018 |
} |
| 1019 |
/* make faces */ |
| 1020 |
newav[0] = mg_ename[MG_E_FACE]; |
| 1021 |
/* do the side faces */ |
| 1022 |
newav[5] = NULL; |
| 1023 |
newav[3] = av[ac-2]; |
| 1024 |
newav[4] = nvn[ac-3]; |
| 1025 |
for (i = 1; i < ac-1; i++) { |
| 1026 |
newav[1] = nvn[i-1]; |
| 1027 |
newav[2] = av[i]; |
| 1028 |
if ((rv = mg_handle(MG_E_FACE, 5, newav)) != MG_OK) |
| 1029 |
return(rv); |
| 1030 |
newav[3] = newav[2]; |
| 1031 |
newav[4] = newav[1]; |
| 1032 |
} |
| 1033 |
/* do top face */ |
| 1034 |
for (i = 1; i < ac-1; i++) { |
| 1035 |
if (hasnorm) { /* zero normals */ |
| 1036 |
vent[1] = nvn[i-1]; |
| 1037 |
if ((rv = mg_handle(MG_E_VERTEX, 2, vent)) != MG_OK) |
| 1038 |
return(rv); |
| 1039 |
if ((rv = mg_handle(MG_E_NORMAL, 4, znorm)) != MG_OK) |
| 1040 |
return(rv); |
| 1041 |
} |
| 1042 |
newav[ac-1-i] = nvn[i-1]; /* reverse */ |
| 1043 |
} |
| 1044 |
if ((rv = mg_handle(MG_E_FACE, ac-1, newav)) != MG_OK) |
| 1045 |
return(rv); |
| 1046 |
/* do bottom face */ |
| 1047 |
if (hasnorm) |
| 1048 |
for (i = 1; i < ac-1; i++) { |
| 1049 |
vent[1] = nvn[i-1]; |
| 1050 |
vent[3] = av[i]; |
| 1051 |
if ((rv = mg_handle(MG_E_VERTEX, 4, vent)) != MG_OK) |
| 1052 |
return(rv); |
| 1053 |
if ((rv = mg_handle(MG_E_NORMAL, 4, znorm)) != MG_OK) |
| 1054 |
return(rv); |
| 1055 |
newav[i] = nvn[i-1]; |
| 1056 |
} |
| 1057 |
else |
| 1058 |
for (i = 1; i < ac-1; i++) |
| 1059 |
newav[i] = av[i]; |
| 1060 |
newav[i] = NULL; |
| 1061 |
if ((rv = mg_handle(MG_E_FACE, i, newav)) != MG_OK) |
| 1062 |
return(rv); |
| 1063 |
return(MG_OK); |
| 1064 |
} |
| 1065 |
|
| 1066 |
|
| 1067 |
static int |
| 1068 |
put_cxy(void) /* put out current xy chromaticities */ |
| 1069 |
{ |
| 1070 |
static char xbuf[24], ybuf[24]; |
| 1071 |
static char *ccom[4] = {mg_ename[MG_E_CXY], xbuf, ybuf}; |
| 1072 |
|
| 1073 |
sprintf(xbuf, "%.4f", c_ccolor->cx); |
| 1074 |
sprintf(ybuf, "%.4f", c_ccolor->cy); |
| 1075 |
return(mg_handle(MG_E_CXY, 3, ccom)); |
| 1076 |
} |
| 1077 |
|
| 1078 |
|
| 1079 |
static int |
| 1080 |
put_cspec(void) /* put out current color spectrum */ |
| 1081 |
{ |
| 1082 |
char wl[2][6], vbuf[C_CNSS][24]; |
| 1083 |
char *newav[C_CNSS+4]; |
| 1084 |
double sf; |
| 1085 |
register int i; |
| 1086 |
|
| 1087 |
if (mg_ehand[MG_E_CSPEC] != c_hcolor) { |
| 1088 |
sprintf(wl[0], "%d", C_CMINWL); |
| 1089 |
sprintf(wl[1], "%d", C_CMAXWL); |
| 1090 |
newav[0] = mg_ename[MG_E_CSPEC]; |
| 1091 |
newav[1] = wl[0]; |
| 1092 |
newav[2] = wl[1]; |
| 1093 |
sf = (double)C_CNSS / c_ccolor->ssum; |
| 1094 |
for (i = 0; i < C_CNSS; i++) { |
| 1095 |
sprintf(vbuf[i], "%.4f", sf*c_ccolor->ssamp[i]); |
| 1096 |
newav[i+3] = vbuf[i]; |
| 1097 |
} |
| 1098 |
newav[C_CNSS+3] = NULL; |
| 1099 |
if ((i = mg_handle(MG_E_CSPEC, C_CNSS+3, newav)) != MG_OK) |
| 1100 |
return(i); |
| 1101 |
} |
| 1102 |
return(MG_OK); |
| 1103 |
} |
| 1104 |
|
| 1105 |
|
| 1106 |
static int |
| 1107 |
e_cspec( /* handle spectral color */ |
| 1108 |
int ac, |
| 1109 |
char **av |
| 1110 |
) |
| 1111 |
{ |
| 1112 |
/* convert to xy chromaticity */ |
| 1113 |
c_ccvt(c_ccolor, C_CSXY); |
| 1114 |
/* if it's really their handler, use it */ |
| 1115 |
if (mg_ehand[MG_E_CXY] != c_hcolor) |
| 1116 |
return(put_cxy()); |
| 1117 |
return(MG_OK); |
| 1118 |
} |
| 1119 |
|
| 1120 |
|
| 1121 |
static int |
| 1122 |
e_cmix( /* handle mixing of colors */ |
| 1123 |
int ac, |
| 1124 |
char **av |
| 1125 |
) |
| 1126 |
{ |
| 1127 |
/* |
| 1128 |
* Contorted logic works as follows: |
| 1129 |
* 1. the colors are already mixed in c_hcolor() support function |
| 1130 |
* 2. if we would handle a spectral result, make sure it's not |
| 1131 |
* 3. if c_hcolor() would handle a spectral result, don't bother |
| 1132 |
* 4. otherwise, make cspec entity and pass it to their handler |
| 1133 |
* 5. if we have only xy results, handle it as c_spec() would |
| 1134 |
*/ |
| 1135 |
if (mg_ehand[MG_E_CSPEC] == e_cspec) |
| 1136 |
c_ccvt(c_ccolor, C_CSXY); |
| 1137 |
else if (c_ccolor->flags & C_CDSPEC) |
| 1138 |
return(put_cspec()); |
| 1139 |
if (mg_ehand[MG_E_CXY] != c_hcolor) |
| 1140 |
return(put_cxy()); |
| 1141 |
return(MG_OK); |
| 1142 |
} |
| 1143 |
|
| 1144 |
|
| 1145 |
static int |
| 1146 |
e_cct( /* handle color temperature */ |
| 1147 |
int ac, |
| 1148 |
char **av |
| 1149 |
) |
| 1150 |
{ |
| 1151 |
/* |
| 1152 |
* Logic is similar to e_cmix here. Support handler has already |
| 1153 |
* converted temperature to spectral color. Put it out as such |
| 1154 |
* if they support it, otherwise convert to xy chromaticity and |
| 1155 |
* put it out if they handle it. |
| 1156 |
*/ |
| 1157 |
if (mg_ehand[MG_E_CSPEC] != e_cspec) |
| 1158 |
return(put_cspec()); |
| 1159 |
c_ccvt(c_ccolor, C_CSXY); |
| 1160 |
if (mg_ehand[MG_E_CXY] != c_hcolor) |
| 1161 |
return(put_cxy()); |
| 1162 |
return(MG_OK); |
| 1163 |
} |
