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greg |
1.1 |
/* Copyright (c) 1994 Regents of the University of California */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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#endif |
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/* |
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* Parse an MGF file, converting or discarding unsupported entities |
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*/ |
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#include <stdio.h> |
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#include <math.h> |
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#include <ctype.h> |
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#include <string.h> |
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#include "parser.h" |
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#include "lookup.h" |
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#include "messages.h" |
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/* |
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* Global definitions of variables declared in parser.h |
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*/ |
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/* entity names */ |
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char mg_ename[MG_NENTITIES][MG_MAXELEN] = MG_NAMELIST; |
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/* Handler routines for each entity */ |
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int (*mg_ehand[MG_NENTITIES])(); |
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/* error messages */ |
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char *mg_err[MG_NERRS] = MG_ERRLIST; |
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MG_FCTXT *mg_file; /* current file context pointer */ |
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int mg_nqcdivs = MG_NQCD; /* number of divisions per quarter circle */ |
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/* |
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* The idea with this parser is to compensate for any missing entries in |
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* mg_ehand with alternate handlers that express these entities in terms |
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* of others that the calling program can handle. |
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* |
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* In some cases, no alternate handler is possible because the entity |
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* has no approximate equivalent. These entities are simply discarded. |
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* |
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* Certain entities are dependent on others, and mg_init() will fail |
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* if the supported entities are not consistent. |
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* |
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* Some alternate entity handlers require that earlier entities be |
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* noted in some fashion, and we therefore keep another array of |
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* parallel support handlers to assist in this effort. |
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*/ |
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/* temporary settings for testing */ |
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#define e_ies e_any_toss |
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greg |
1.4 |
#define e_cmix e_any_toss |
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#define e_cspec e_any_toss |
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greg |
1.1 |
/* alternate handler routines */ |
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static int e_any_toss(), /* discard unneeded entity */ |
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greg |
1.2 |
e_ies(), /* IES luminaire file */ |
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greg |
1.1 |
e_include(), /* include file */ |
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e_sph(), /* sphere */ |
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greg |
1.4 |
e_cmix(), /* color mixtures */ |
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e_cspec(); /* color spectra */ |
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greg |
1.1 |
e_cyl(), /* cylinder */ |
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e_cone(), /* cone */ |
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greg |
1.4 |
e_prism(), /* prism */ |
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greg |
1.1 |
e_ring(), /* ring */ |
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e_torus(); /* torus */ |
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/* alternate handler support functions */ |
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static int (*e_supp[MG_NENTITIES])(); |
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static char FLTFMT[] = "%.12g"; |
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static int warpconends; /* hack for generating good normals */ |
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void |
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mg_init() /* initialize alternate entity handlers */ |
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{ |
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unsigned long ineed = 0, uneed = 0; |
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register int i; |
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/* pick up slack */ |
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if (mg_ehand[MG_E_IES] == NULL) |
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mg_ehand[MG_E_IES] = e_ies; |
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if (mg_ehand[MG_E_INCLUDE] == NULL) |
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mg_ehand[MG_E_INCLUDE] = e_include; |
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if (mg_ehand[MG_E_SPH] == NULL) { |
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mg_ehand[MG_E_SPH] = e_sph; |
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ineed |= 1<<MG_E_POINT|1<<MG_E_VERTEX; |
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} else |
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uneed |= 1<<MG_E_POINT|1<<MG_E_VERTEX|1<<MG_E_XF; |
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if (mg_ehand[MG_E_CYL] == NULL) { |
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mg_ehand[MG_E_CYL] = e_cyl; |
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ineed |= 1<<MG_E_POINT|1<<MG_E_VERTEX; |
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} else |
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uneed |= 1<<MG_E_POINT|1<<MG_E_VERTEX|1<<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 |= 1<<MG_E_POINT|1<<MG_E_VERTEX; |
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} else |
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uneed |= 1<<MG_E_POINT|1<<MG_E_VERTEX|1<<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 |= 1<<MG_E_POINT|1<<MG_E_NORMAL|1<<MG_E_VERTEX; |
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} else |
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uneed |= 1<<MG_E_POINT|1<<MG_E_NORMAL|1<<MG_E_VERTEX|1<<MG_E_XF; |
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greg |
1.4 |
if (mg_ehand[MG_E_PRISM] == NULL) { |
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mg_ehand[MG_E_PRISM] = e_prism; |
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ineed |= 1<<MG_E_POINT|1<<MG_E_VERTEX; |
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} else |
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uneed |= 1<<MG_E_POINT|1<<MG_E_VERTEX|1<<MG_E_XF; |
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greg |
1.1 |
if (mg_ehand[MG_E_TORUS] == NULL) { |
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mg_ehand[MG_E_TORUS] = e_torus; |
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ineed |= 1<<MG_E_POINT|1<<MG_E_NORMAL|1<<MG_E_VERTEX; |
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} else |
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uneed |= 1<<MG_E_POINT|1<<MG_E_NORMAL|1<<MG_E_VERTEX|1<<MG_E_XF; |
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greg |
1.4 |
if (mg_ehand[MG_E_COLOR] != NULL) { |
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if (mg_ehand[MG_E_CMIX] == NULL) |
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mg_ehand[MG_E_CMIX] = e_cmix; |
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if (mg_ehand[MG_E_CSPEC] == NULL) |
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mg_ehand[MG_E_CSPEC] = e_cspec; |
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} |
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greg |
1.1 |
/* check for consistency */ |
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if (mg_ehand[MG_E_FACE] != NULL) |
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uneed |= 1<<MG_E_POINT|1<<MG_E_VERTEX|1<<MG_E_XF; |
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if (mg_ehand[MG_E_CXY] != NULL) |
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uneed |= 1<<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_ED] != NULL || |
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mg_ehand[MG_E_RS] != NULL || |
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mg_ehand[MG_E_TS] != NULL) |
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uneed |= 1<<MG_E_MATERIAL; |
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for (i = 0; i < MG_NENTITIES; i++) |
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if (uneed & 1<<i && mg_ehand[i] == NULL) { |
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fprintf(stderr, "Missing support for \"%s\" entity\n", |
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mg_ename[i]); |
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exit(1); |
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} |
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/* add support as needed */ |
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if (ineed & 1<<MG_E_VERTEX && mg_ehand[MG_E_VERTEX] != c_hvertex) |
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e_supp[MG_E_VERTEX] = c_hvertex; |
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if (ineed & 1<<MG_E_POINT && mg_ehand[MG_E_POINT] != c_hvertex) |
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e_supp[MG_E_POINT] = c_hvertex; |
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if (ineed & 1<<MG_E_NORMAL && mg_ehand[MG_E_NORMAL] != c_hvertex) |
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e_supp[MG_E_NORMAL] = c_hvertex; |
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/* discard remaining entities */ |
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for (i = 0; i < MG_NENTITIES; i++) |
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if (mg_ehand[i] == NULL) |
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mg_ehand[i] = e_any_toss; |
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} |
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int |
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mg_entity(name) /* get entity number from its name */ |
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char *name; |
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{ |
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static LUTAB ent_tab; /* entity lookup table */ |
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register char *cp; |
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if (!ent_tab.tsiz) { /* initialize hash table */ |
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if (!lu_init(&ent_tab, MG_NENTITIES)) |
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return(-1); /* what to do? */ |
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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; |
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} |
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cp = lu_find(&ent_tab, name)->key; |
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if (cp == NULL) |
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return(-1); |
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return((cp - mg_ename[0])/sizeof(mg_ename[0])); |
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} |
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static int |
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handle_it(en, ac, av) /* pass entity to appropriate handler */ |
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register int en; |
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int ac; |
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char **av; |
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{ |
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int rv; |
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if (en < 0 && (en = mg_entity(av[0])) < 0) |
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return(MG_EUNK); |
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if (e_supp[en] != NULL) { |
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if ((rv = (*e_supp[en])(ac, av)) != MG_OK) |
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return(rv); |
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} |
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return((*mg_ehand[en])(ac, av)); |
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} |
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int |
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mg_open(ctx, fn) /* open new input file */ |
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register MG_FCTXT *ctx; |
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char *fn; |
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{ |
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int olen; |
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register char *cp; |
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ctx->lineno = 0; |
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if (fn == NULL) { |
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ctx->fname = "<stdin>"; |
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ctx->fp = stdin; |
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ctx->prev = mg_file; |
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mg_file = ctx; |
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return(MG_OK); |
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} |
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/* get name relative to this context */ |
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if (mg_file != NULL && |
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(cp = strrchr(mg_file->fname, '/')) != NULL) |
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olen = cp - mg_file->fname + 1; |
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else |
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olen = 0; |
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ctx->fname = (char *)malloc(olen+strlen(fn)+1); |
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if (ctx->fname == NULL) |
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return(MG_EMEM); |
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if (olen) |
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strcpy(ctx->fname, mg_file->fname); |
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strcpy(ctx->fname+olen, fn); |
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ctx->fp = fopen(ctx->fname, "r"); |
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if (ctx->fp == NULL) { |
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free((MEM_PTR)ctx->fname); |
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return(MG_ENOFILE); |
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} |
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ctx->prev = mg_file; /* establish new context */ |
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mg_file = ctx; |
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return(MG_OK); |
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} |
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void |
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mg_close() /* close input file */ |
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{ |
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register MG_FCTXT *ctx = mg_file; |
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mg_file = ctx->prev; /* restore enclosing context */ |
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if (ctx->fp == stdin) |
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return; /* don't close standard input */ |
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fclose(ctx->fp); |
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free((MEM_PTR)ctx->fname); |
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} |
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int |
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mg_rewind() /* rewind input file */ |
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{ |
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if (mg_file->lineno == 0) |
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return(MG_OK); |
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if (mg_file->fp == stdin) |
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return(MG_ESEEK); /* cannot seek on standard input */ |
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if (fseek(mg_file->fp, 0L, 0) == EOF) |
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return(MG_ESEEK); |
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mg_file->lineno = 0; |
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return(MG_OK); |
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} |
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int |
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mg_read() /* read next line from file */ |
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{ |
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register int len = 0; |
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do { |
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if (fgets(mg_file->inpline+len, |
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MG_MAXLINE-len, mg_file->fp) == NULL) |
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return(len); |
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mg_file->lineno++; |
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len += strlen(mg_file->inpline+len); |
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if (len > 1 && mg_file->inpline[len-2] == '\\') |
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mg_file->inpline[--len-1] = ' '; |
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} while (mg_file->inpline[len]); |
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return(len); |
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} |
| 280 |
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int |
| 283 |
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mg_parse() /* parse current input line */ |
| 284 |
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{ |
| 285 |
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char abuf[MG_MAXLINE]; |
| 286 |
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char *argv[MG_MAXARGC]; |
| 287 |
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int en; |
| 288 |
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register char *cp, **ap; |
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| 290 |
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strcpy(cp=abuf, mg_file->inpline); |
| 291 |
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ap = argv; /* break into words */ |
| 292 |
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for ( ; ; ) { |
| 293 |
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while (isspace(*cp)) |
| 294 |
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*cp++ = '\0'; |
| 295 |
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if (!*cp) |
| 296 |
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break; |
| 297 |
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if (ap - argv >= MG_MAXARGC-1) |
| 298 |
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return(MG_EARGC); |
| 299 |
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*ap++ = cp; |
| 300 |
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while (*++cp && !isspace(*cp)) |
| 301 |
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; |
| 302 |
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} |
| 303 |
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if (ap == argv) |
| 304 |
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return(MG_OK); /* no words in line */ |
| 305 |
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*ap = NULL; |
| 306 |
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/* else handle it */ |
| 307 |
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return(handle_it(-1, ap-argv, argv)); |
| 308 |
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} |
| 309 |
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| 310 |
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| 311 |
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int |
| 312 |
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mg_load(fn) /* load an MGF file */ |
| 313 |
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char *fn; |
| 314 |
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{ |
| 315 |
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MG_FCTXT cntxt; |
| 316 |
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int rval; |
| 317 |
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| 318 |
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if ((rval = mg_open(&cntxt, fn)) != MG_OK) { |
| 319 |
greg |
1.2 |
fprintf(stderr, "%s: %s\n", fn, mg_err[rval]); |
| 320 |
greg |
1.1 |
return(rval); |
| 321 |
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} |
| 322 |
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while (mg_read()) /* parse each line */ |
| 323 |
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if ((rval = mg_parse()) != MG_OK) { |
| 324 |
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fprintf(stderr, "%s: %d: %s:\n%s", cntxt.fname, |
| 325 |
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cntxt.lineno, mg_err[rval], |
| 326 |
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cntxt.inpline); |
| 327 |
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break; |
| 328 |
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} |
| 329 |
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mg_close(); |
| 330 |
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return(rval); |
| 331 |
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} |
| 332 |
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| 333 |
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| 334 |
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void |
| 335 |
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mg_clear() /* clear parser history */ |
| 336 |
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{ |
| 337 |
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c_clearall(); /* clear context tables */ |
| 338 |
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mg_file = NULL; /* reset our context */ |
| 339 |
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} |
| 340 |
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| 341 |
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| 342 |
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int |
| 343 |
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mg_iterate(ac, av, f) /* iterate on statement */ |
| 344 |
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int ac; |
| 345 |
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register char **av; |
| 346 |
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int (*f)(); |
| 347 |
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{ |
| 348 |
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int niter, rval; |
| 349 |
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register int i, j; |
| 350 |
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char *argv[MG_MAXARGC]; |
| 351 |
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char cntbuf[10]; |
| 352 |
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/* build partial transformation */ |
| 353 |
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for (i = 0; i < ac; i++) { |
| 354 |
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if (av[i][0] == '-' && av[i][1] == 'a' && av[i][2] == '\0') |
| 355 |
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break; |
| 356 |
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argv[i+1] = av[i]; |
| 357 |
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} |
| 358 |
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argv[i+1] = NULL; |
| 359 |
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if (i) { /* handle transformation */ |
| 360 |
|
|
argv[0] = mg_ename[MG_E_XF]; |
| 361 |
|
|
if ((rval = handle_it(MG_E_XF, i+1, argv)) != MG_OK) |
| 362 |
|
|
return(rval); |
| 363 |
|
|
} |
| 364 |
|
|
if (i < ac) { /* run array */ |
| 365 |
|
|
if (i+1 >= ac || !isint(av[i+1])) |
| 366 |
|
|
return(MG_ETYPE); |
| 367 |
|
|
niter = atoi(av[i+1]); |
| 368 |
greg |
1.2 |
argv[0] = mg_ename[MG_E_OBJECT]; |
| 369 |
greg |
1.1 |
argv[1] = cntbuf; |
| 370 |
|
|
for (j = 2; j+i < ac; j++) |
| 371 |
|
|
argv[j] = av[j+i]; |
| 372 |
|
|
argv[j] = NULL; |
| 373 |
|
|
for (j = 0; j < niter; j++) { |
| 374 |
|
|
sprintf(cntbuf, "%d", j); |
| 375 |
greg |
1.2 |
if ((rval = handle_it(MG_E_OBJECT, 2, argv)) != MG_OK) |
| 376 |
|
|
return(rval); |
| 377 |
|
|
argv[0] = "-i"; |
| 378 |
greg |
1.1 |
if ((rval = mg_iterate(ac-i, argv, f)) != MG_OK) |
| 379 |
greg |
1.2 |
return(rval); |
| 380 |
|
|
argv[0] = mg_ename[MG_E_OBJECT]; |
| 381 |
|
|
if ((rval = handle_it(MG_E_OBJECT, 1, argv)) != MG_OK) |
| 382 |
greg |
1.1 |
return(rval); |
| 383 |
|
|
} |
| 384 |
|
|
} else if ((rval = (*f)()) != MG_OK) /* else do this instance */ |
| 385 |
|
|
return(rval); |
| 386 |
|
|
if (i) { /* reset the transform */ |
| 387 |
|
|
argv[0] = mg_ename[MG_E_XF]; |
| 388 |
|
|
argv[1] = NULL; |
| 389 |
|
|
(void)handle_it(MG_E_XF, 1, argv); |
| 390 |
|
|
} |
| 391 |
|
|
return(MG_OK); |
| 392 |
|
|
} |
| 393 |
|
|
|
| 394 |
|
|
|
| 395 |
|
|
/**************************************************************************** |
| 396 |
|
|
* The following routines handle unsupported entities |
| 397 |
|
|
*/ |
| 398 |
|
|
|
| 399 |
|
|
|
| 400 |
|
|
static int |
| 401 |
|
|
e_any_toss(ac, av) /* discard an unwanted entity */ |
| 402 |
|
|
int ac; |
| 403 |
|
|
char **av; |
| 404 |
|
|
{ |
| 405 |
|
|
return(MG_OK); |
| 406 |
|
|
} |
| 407 |
|
|
|
| 408 |
|
|
|
| 409 |
|
|
static int |
| 410 |
|
|
reload_file() /* reload current MGF file */ |
| 411 |
|
|
{ |
| 412 |
|
|
register int rval; |
| 413 |
|
|
|
| 414 |
|
|
if ((rval = mg_rewind()) != MG_OK) |
| 415 |
|
|
return(rval); |
| 416 |
|
|
while (mg_read()) |
| 417 |
|
|
if ((rval = mg_parse()) != MG_OK) |
| 418 |
|
|
return(rval); |
| 419 |
|
|
return(MG_OK); |
| 420 |
|
|
} |
| 421 |
|
|
|
| 422 |
|
|
|
| 423 |
|
|
static int |
| 424 |
|
|
e_include(ac, av) /* include file */ |
| 425 |
|
|
int ac; |
| 426 |
|
|
char **av; |
| 427 |
|
|
{ |
| 428 |
|
|
MG_FCTXT ictx; |
| 429 |
|
|
int rv; |
| 430 |
|
|
|
| 431 |
|
|
if (ac < 2) |
| 432 |
|
|
return(MG_EARGC); |
| 433 |
|
|
if ((rv = mg_open(&ictx, av[1])) != MG_OK) |
| 434 |
|
|
return(rv); |
| 435 |
|
|
if ((rv = mg_iterate(ac-2, av+2, reload_file)) != MG_OK) { |
| 436 |
|
|
fprintf(stderr, "%s: %d: %s:\n%s", ictx.fname, |
| 437 |
|
|
ictx.lineno, mg_err[rv], ictx.inpline); |
| 438 |
|
|
mg_close(); |
| 439 |
|
|
return(MG_EINCL); |
| 440 |
|
|
} |
| 441 |
|
|
mg_close(); |
| 442 |
|
|
return(MG_OK); |
| 443 |
|
|
} |
| 444 |
|
|
|
| 445 |
|
|
|
| 446 |
|
|
static void |
| 447 |
|
|
make_axes(u, v, w) /* compute u and v given w (normalized) */ |
| 448 |
|
|
FVECT u, v, w; |
| 449 |
|
|
{ |
| 450 |
|
|
register int i; |
| 451 |
|
|
|
| 452 |
|
|
v[0] = v[1] = v[2] = 0.; |
| 453 |
|
|
for (i = 0; i < 3; i++) |
| 454 |
|
|
if (w[i] < .6 && w[i] > -.6) |
| 455 |
|
|
break; |
| 456 |
|
|
v[i] = 1.; |
| 457 |
|
|
fcross(u, v, w); |
| 458 |
|
|
normalize(u); |
| 459 |
|
|
fcross(v, w, u); |
| 460 |
|
|
} |
| 461 |
|
|
|
| 462 |
|
|
|
| 463 |
|
|
static int |
| 464 |
|
|
e_sph(ac, av) /* expand a sphere into cones */ |
| 465 |
|
|
int ac; |
| 466 |
|
|
char **av; |
| 467 |
|
|
{ |
| 468 |
|
|
static char p2x[24], p2y[24], p2z[24], r1[24], r2[24]; |
| 469 |
|
|
static char *v1ent[5] = {mg_ename[MG_E_VERTEX],"_sv1","=","_sv2"}; |
| 470 |
|
|
static char *v2ent[4] = {mg_ename[MG_E_VERTEX],"_sv2","="}; |
| 471 |
|
|
static char *p2ent[5] = {mg_ename[MG_E_POINT],p2x,p2y,p2z}; |
| 472 |
|
|
static char *conent[6] = {mg_ename[MG_E_CONE],"_sv1",r1,"_sv2",r2}; |
| 473 |
|
|
register C_VERTEX *cv; |
| 474 |
|
|
register int i; |
| 475 |
|
|
int rval; |
| 476 |
|
|
double rad; |
| 477 |
|
|
double theta; |
| 478 |
|
|
|
| 479 |
|
|
if (ac != 3) |
| 480 |
|
|
return(MG_EARGC); |
| 481 |
|
|
if ((cv = c_getvert(av[1])) == NULL) |
| 482 |
|
|
return(MG_EUNDEF); |
| 483 |
|
|
if (!isflt(av[2])) |
| 484 |
|
|
return(MG_ETYPE); |
| 485 |
|
|
rad = atof(av[2]); |
| 486 |
|
|
/* initialize */ |
| 487 |
|
|
warpconends = 1; |
| 488 |
|
|
if ((rval = handle_it(MG_E_VERTEX, 3, v2ent)) != MG_OK) |
| 489 |
|
|
return(rval); |
| 490 |
|
|
sprintf(p2x, FLTFMT, cv->p[0]); |
| 491 |
|
|
sprintf(p2y, FLTFMT, cv->p[1]); |
| 492 |
|
|
sprintf(p2z, FLTFMT, cv->p[2]+rad); |
| 493 |
|
|
if ((rval = handle_it(MG_E_POINT, 4, p2ent)) != MG_OK) |
| 494 |
|
|
return(rval); |
| 495 |
|
|
r2[0] = '0'; r2[1] = '\0'; |
| 496 |
|
|
for (i = 1; i <= 2*mg_nqcdivs; i++) { |
| 497 |
|
|
theta = i*(PI/2)/mg_nqcdivs; |
| 498 |
|
|
if ((rval = handle_it(MG_E_VERTEX, 4, v1ent)) != MG_OK) |
| 499 |
|
|
return(rval); |
| 500 |
|
|
sprintf(p2z, FLTFMT, cv->p[2]+rad*cos(theta)); |
| 501 |
|
|
if ((rval = handle_it(MG_E_VERTEX, 2, v2ent)) != MG_OK) |
| 502 |
|
|
return(rval); |
| 503 |
|
|
if ((rval = handle_it(MG_E_POINT, 4, p2ent)) != MG_OK) |
| 504 |
|
|
return(rval); |
| 505 |
|
|
strcpy(r1, r2); |
| 506 |
|
|
sprintf(r2, FLTFMT, rad*sin(theta)); |
| 507 |
|
|
if ((rval = handle_it(MG_E_CONE, 5, conent)) != MG_OK) |
| 508 |
|
|
return(rval); |
| 509 |
|
|
} |
| 510 |
|
|
warpconends = 0; |
| 511 |
|
|
return(MG_OK); |
| 512 |
|
|
} |
| 513 |
|
|
|
| 514 |
|
|
|
| 515 |
|
|
static int |
| 516 |
|
|
e_torus(ac, av) /* expand a torus into cones */ |
| 517 |
|
|
int ac; |
| 518 |
|
|
char **av; |
| 519 |
|
|
{ |
| 520 |
|
|
static char p2[3][24], r1[24], r2[24]; |
| 521 |
|
|
static char *v1ent[5] = {mg_ename[MG_E_VERTEX],"_tv1","=","_tv2"}; |
| 522 |
|
|
static char *v2ent[5] = {mg_ename[MG_E_VERTEX],"_tv2","="}; |
| 523 |
|
|
static char *p2ent[5] = {mg_ename[MG_E_POINT],p2[0],p2[1],p2[2]}; |
| 524 |
|
|
static char *conent[6] = {mg_ename[MG_E_CONE],"_tv1",r1,"_tv2",r2}; |
| 525 |
|
|
register C_VERTEX *cv; |
| 526 |
|
|
register int i, j; |
| 527 |
|
|
int rval; |
| 528 |
|
|
int sgn; |
| 529 |
|
|
double minrad, maxrad, avgrad; |
| 530 |
|
|
double theta; |
| 531 |
|
|
|
| 532 |
|
|
if (ac != 4) |
| 533 |
|
|
return(MG_EARGC); |
| 534 |
|
|
if ((cv = c_getvert(av[1])) == NULL) |
| 535 |
|
|
return(MG_EUNDEF); |
| 536 |
greg |
1.3 |
if (is0vect(cv->n)) |
| 537 |
greg |
1.1 |
return(MG_EILL); |
| 538 |
|
|
if (!isflt(av[2]) || !isflt(av[3])) |
| 539 |
|
|
return(MG_ETYPE); |
| 540 |
|
|
minrad = atof(av[2]); |
| 541 |
greg |
1.3 |
round0(minrad); |
| 542 |
greg |
1.1 |
maxrad = atof(av[3]); |
| 543 |
|
|
/* check orientation */ |
| 544 |
|
|
if (minrad > 0.) |
| 545 |
|
|
sgn = 1; |
| 546 |
|
|
else if (minrad < 0.) |
| 547 |
|
|
sgn = -1; |
| 548 |
|
|
else if (maxrad > 0.) |
| 549 |
|
|
sgn = 1; |
| 550 |
|
|
else if (maxrad < 0.) |
| 551 |
|
|
sgn = -1; |
| 552 |
|
|
else |
| 553 |
|
|
return(MG_EILL); |
| 554 |
|
|
if (sgn*(maxrad-minrad) <= 0.) |
| 555 |
|
|
return(MG_EILL); |
| 556 |
|
|
/* initialize */ |
| 557 |
|
|
warpconends = 1; |
| 558 |
|
|
v2ent[3] = av[1]; |
| 559 |
|
|
for (j = 0; j < 3; j++) |
| 560 |
|
|
sprintf(p2[j], FLTFMT, cv->p[j] + |
| 561 |
|
|
.5*sgn*(maxrad-minrad)*cv->n[j]); |
| 562 |
|
|
if ((rval = handle_it(MG_E_VERTEX, 4, v2ent)) != MG_OK) |
| 563 |
|
|
return(rval); |
| 564 |
|
|
if ((rval = handle_it(MG_E_POINT, 4, p2ent)) != MG_OK) |
| 565 |
|
|
return(rval); |
| 566 |
|
|
sprintf(r2, FLTFMT, avgrad=.5*(minrad+maxrad)); |
| 567 |
|
|
/* run outer section */ |
| 568 |
|
|
for (i = 1; i <= 2*mg_nqcdivs; i++) { |
| 569 |
|
|
theta = i*(PI/2)/mg_nqcdivs; |
| 570 |
|
|
if ((rval = handle_it(MG_E_VERTEX, 4, v1ent)) != MG_OK) |
| 571 |
|
|
return(rval); |
| 572 |
|
|
for (j = 0; j < 3; j++) |
| 573 |
|
|
sprintf(p2[j], FLTFMT, cv->p[j] + |
| 574 |
|
|
.5*sgn*(maxrad-minrad)*cos(theta)*cv->n[j]); |
| 575 |
|
|
if ((rval = handle_it(MG_E_VERTEX, 2, v2ent)) != MG_OK) |
| 576 |
|
|
return(rval); |
| 577 |
|
|
if ((rval = handle_it(MG_E_POINT, 4, p2ent)) != MG_OK) |
| 578 |
|
|
return(rval); |
| 579 |
|
|
strcpy(r1, r2); |
| 580 |
|
|
sprintf(r2, FLTFMT, avgrad + .5*(maxrad-minrad)*sin(theta)); |
| 581 |
|
|
if ((rval = handle_it(MG_E_CONE, 5, conent)) != MG_OK) |
| 582 |
|
|
return(rval); |
| 583 |
|
|
} |
| 584 |
|
|
/* run inner section */ |
| 585 |
|
|
sprintf(r2, FLTFMT, -.5*(minrad+maxrad)); |
| 586 |
|
|
for ( ; i <= 4*mg_nqcdivs; i++) { |
| 587 |
|
|
theta = i*(PI/2)/mg_nqcdivs; |
| 588 |
|
|
for (j = 0; j < 3; j++) |
| 589 |
|
|
sprintf(p2[j], FLTFMT, cv->p[j] + |
| 590 |
|
|
.5*sgn*(maxrad-minrad)*cos(theta)*cv->n[j]); |
| 591 |
|
|
if ((rval = handle_it(MG_E_VERTEX, 4, v1ent)) != MG_OK) |
| 592 |
|
|
return(rval); |
| 593 |
|
|
if ((rval = handle_it(MG_E_VERTEX, 2, v2ent)) != MG_OK) |
| 594 |
|
|
return(rval); |
| 595 |
|
|
if ((rval = handle_it(MG_E_POINT, 4, p2ent)) != MG_OK) |
| 596 |
|
|
return(rval); |
| 597 |
|
|
strcpy(r1, r2); |
| 598 |
|
|
sprintf(r2, FLTFMT, -avgrad - .5*(maxrad-minrad)*sin(theta)); |
| 599 |
|
|
if ((rval = handle_it(MG_E_CONE, 5, conent)) != MG_OK) |
| 600 |
|
|
return(rval); |
| 601 |
|
|
} |
| 602 |
|
|
warpconends = 0; |
| 603 |
|
|
return(MG_OK); |
| 604 |
|
|
} |
| 605 |
|
|
|
| 606 |
|
|
|
| 607 |
|
|
static int |
| 608 |
|
|
e_cyl(ac, av) /* replace a cylinder with equivalent cone */ |
| 609 |
|
|
int ac; |
| 610 |
|
|
char **av; |
| 611 |
|
|
{ |
| 612 |
|
|
static char *avnew[6] = {mg_ename[MG_E_CONE]}; |
| 613 |
|
|
|
| 614 |
|
|
if (ac != 4) |
| 615 |
|
|
return(MG_EARGC); |
| 616 |
|
|
avnew[1] = av[1]; |
| 617 |
|
|
avnew[2] = av[2]; |
| 618 |
|
|
avnew[3] = av[3]; |
| 619 |
|
|
avnew[4] = av[2]; |
| 620 |
|
|
return(handle_it(MG_E_CONE, 5, avnew)); |
| 621 |
|
|
} |
| 622 |
|
|
|
| 623 |
|
|
|
| 624 |
|
|
static int |
| 625 |
|
|
e_ring(ac, av) /* turn a ring into polygons */ |
| 626 |
|
|
int ac; |
| 627 |
|
|
char **av; |
| 628 |
|
|
{ |
| 629 |
|
|
static char p3[3][24], p4[3][24]; |
| 630 |
|
|
static char *nzent[5] = {mg_ename[MG_E_NORMAL],"0","0","0"}; |
| 631 |
|
|
static char *v1ent[5] = {mg_ename[MG_E_VERTEX],"_rv1","="}; |
| 632 |
|
|
static char *v2ent[5] = {mg_ename[MG_E_VERTEX],"_rv2","=","_rv3"}; |
| 633 |
|
|
static char *v3ent[4] = {mg_ename[MG_E_VERTEX],"_rv3","="}; |
| 634 |
|
|
static char *p3ent[5] = {mg_ename[MG_E_POINT],p3[0],p3[1],p3[2]}; |
| 635 |
|
|
static char *v4ent[4] = {mg_ename[MG_E_VERTEX],"_rv4","="}; |
| 636 |
|
|
static char *p4ent[5] = {mg_ename[MG_E_POINT],p4[0],p4[1],p4[2]}; |
| 637 |
|
|
static char *fent[6] = {mg_ename[MG_E_FACE],"_rv1","_rv2","_rv3","_rv4"}; |
| 638 |
|
|
register C_VERTEX *cv; |
| 639 |
|
|
register int i, j; |
| 640 |
|
|
FVECT u, v; |
| 641 |
|
|
double minrad, maxrad; |
| 642 |
|
|
int rv; |
| 643 |
|
|
double theta, d; |
| 644 |
|
|
|
| 645 |
|
|
if (ac != 4) |
| 646 |
|
|
return(MG_EARGC); |
| 647 |
|
|
if ((cv = c_getvert(av[1])) == NULL) |
| 648 |
|
|
return(MG_EUNDEF); |
| 649 |
greg |
1.3 |
if (is0vect(cv->n)) |
| 650 |
greg |
1.1 |
return(MG_EILL); |
| 651 |
|
|
if (!isflt(av[2]) || !isflt(av[3])) |
| 652 |
|
|
return(MG_ETYPE); |
| 653 |
|
|
minrad = atof(av[2]); |
| 654 |
greg |
1.3 |
round0(minrad); |
| 655 |
greg |
1.1 |
maxrad = atof(av[3]); |
| 656 |
|
|
if (minrad < 0. || maxrad <= minrad) |
| 657 |
|
|
return(MG_EILL); |
| 658 |
|
|
/* initialize */ |
| 659 |
|
|
make_axes(u, v, cv->n); |
| 660 |
|
|
for (j = 0; j < 3; j++) |
| 661 |
|
|
sprintf(p3[j], FLTFMT, cv->p[j] + maxrad*u[j]); |
| 662 |
|
|
if ((rv = handle_it(MG_E_VERTEX, 3, v3ent)) != MG_OK) |
| 663 |
|
|
return(rv); |
| 664 |
|
|
if ((rv = handle_it(MG_E_POINT, 4, p3ent)) != MG_OK) |
| 665 |
|
|
return(rv); |
| 666 |
|
|
if (minrad == 0.) { /* closed */ |
| 667 |
|
|
v1ent[3] = av[1]; |
| 668 |
|
|
if ((rv = handle_it(MG_E_VERTEX, 4, v1ent)) != MG_OK) |
| 669 |
|
|
return(rv); |
| 670 |
|
|
if ((rv = handle_it(MG_E_NORMAL, 4, nzent)) != MG_OK) |
| 671 |
|
|
return(rv); |
| 672 |
|
|
for (i = 1; i <= 4*mg_nqcdivs; i++) { |
| 673 |
|
|
theta = i*(PI/2)/mg_nqcdivs; |
| 674 |
|
|
if ((rv = handle_it(MG_E_VERTEX, 4, v2ent)) != MG_OK) |
| 675 |
|
|
return(rv); |
| 676 |
|
|
for (j = 0; j < 3; j++) |
| 677 |
|
|
sprintf(p3[j], FLTFMT, cv->p[j] + |
| 678 |
|
|
maxrad*u[j]*cos(theta) + |
| 679 |
|
|
maxrad*v[j]*sin(theta)); |
| 680 |
greg |
1.3 |
if ((rv = handle_it(MG_E_VERTEX, 2, v3ent)) != MG_OK) |
| 681 |
greg |
1.1 |
return(rv); |
| 682 |
|
|
if ((rv = handle_it(MG_E_POINT, 4, p3ent)) != MG_OK) |
| 683 |
|
|
return(rv); |
| 684 |
|
|
if ((rv = handle_it(MG_E_FACE, 4, fent)) != MG_OK) |
| 685 |
|
|
return(rv); |
| 686 |
|
|
} |
| 687 |
|
|
} else { /* open */ |
| 688 |
|
|
if ((rv = handle_it(MG_E_VERTEX, 3, v4ent)) != MG_OK) |
| 689 |
|
|
return(rv); |
| 690 |
|
|
for (j = 0; j < 3; j++) |
| 691 |
|
|
sprintf(p4[j], FLTFMT, cv->p[j] + minrad*u[j]); |
| 692 |
|
|
if ((rv = handle_it(MG_E_POINT, 4, p4ent)) != MG_OK) |
| 693 |
|
|
return(rv); |
| 694 |
|
|
v1ent[3] = "_rv4"; |
| 695 |
|
|
for (i = 1; i <= 4*mg_nqcdivs; i++) { |
| 696 |
|
|
theta = i*(PI/2)/mg_nqcdivs; |
| 697 |
|
|
if ((rv = handle_it(MG_E_VERTEX, 4, v1ent)) != MG_OK) |
| 698 |
|
|
return(rv); |
| 699 |
|
|
if ((rv = handle_it(MG_E_VERTEX, 4, v2ent)) != MG_OK) |
| 700 |
|
|
return(rv); |
| 701 |
|
|
for (j = 0; j < 3; j++) { |
| 702 |
|
|
d = u[j]*cos(theta) + v[j]*sin(theta); |
| 703 |
|
|
sprintf(p3[j], FLTFMT, cv->p[j] + maxrad*d); |
| 704 |
|
|
sprintf(p4[j], FLTFMT, cv->p[j] + minrad*d); |
| 705 |
|
|
} |
| 706 |
greg |
1.3 |
if ((rv = handle_it(MG_E_VERTEX, 2, v3ent)) != MG_OK) |
| 707 |
greg |
1.1 |
return(rv); |
| 708 |
|
|
if ((rv = handle_it(MG_E_POINT, 4, p3ent)) != MG_OK) |
| 709 |
|
|
return(rv); |
| 710 |
greg |
1.3 |
if ((rv = handle_it(MG_E_VERTEX, 2, v4ent)) != MG_OK) |
| 711 |
greg |
1.1 |
return(rv); |
| 712 |
|
|
if ((rv = handle_it(MG_E_POINT, 4, p4ent)) != MG_OK) |
| 713 |
|
|
return(rv); |
| 714 |
|
|
if ((rv = handle_it(MG_E_FACE, 5, fent)) != MG_OK) |
| 715 |
|
|
return(rv); |
| 716 |
|
|
} |
| 717 |
|
|
} |
| 718 |
|
|
return(MG_OK); |
| 719 |
|
|
} |
| 720 |
|
|
|
| 721 |
|
|
|
| 722 |
|
|
static int |
| 723 |
|
|
e_cone(ac, av) /* turn a cone into polygons */ |
| 724 |
|
|
int ac; |
| 725 |
|
|
char **av; |
| 726 |
|
|
{ |
| 727 |
|
|
static char p3[3][24], p4[3][24], n3[3][24], n4[3][24]; |
| 728 |
|
|
static char *v1ent[5] = {mg_ename[MG_E_VERTEX],"_cv1","="}; |
| 729 |
|
|
static char *v2ent[5] = {mg_ename[MG_E_VERTEX],"_cv2","=","_cv3"}; |
| 730 |
|
|
static char *v3ent[4] = {mg_ename[MG_E_VERTEX],"_cv3","="}; |
| 731 |
|
|
static char *p3ent[5] = {mg_ename[MG_E_POINT],p3[0],p3[1],p3[2]}; |
| 732 |
|
|
static char *n3ent[5] = {mg_ename[MG_E_NORMAL],n3[0],n3[1],n3[2]}; |
| 733 |
|
|
static char *v4ent[4] = {mg_ename[MG_E_VERTEX],"_cv4","="}; |
| 734 |
|
|
static char *p4ent[5] = {mg_ename[MG_E_POINT],p4[0],p4[1],p4[2]}; |
| 735 |
|
|
static char *n4ent[5] = {mg_ename[MG_E_NORMAL],n4[0],n4[1],n4[2]}; |
| 736 |
|
|
static char *fent[6] = {mg_ename[MG_E_FACE],"_cv1","_cv2","_cv3","_cv4"}; |
| 737 |
|
|
register C_VERTEX *cv1, *cv2; |
| 738 |
|
|
register int i, j; |
| 739 |
|
|
FVECT u, v, w; |
| 740 |
|
|
double rad1, rad2; |
| 741 |
|
|
int sgn; |
| 742 |
|
|
double n1off, n2off; |
| 743 |
|
|
double d; |
| 744 |
|
|
int rv; |
| 745 |
|
|
double theta; |
| 746 |
|
|
|
| 747 |
|
|
if (ac != 5) |
| 748 |
|
|
return(MG_EARGC); |
| 749 |
|
|
if ((cv1 = c_getvert(av[1])) == NULL || |
| 750 |
|
|
(cv2 = c_getvert(av[3])) == NULL) |
| 751 |
|
|
return(MG_EUNDEF); |
| 752 |
|
|
if (!isflt(av[2]) || !isflt(av[4])) |
| 753 |
|
|
return(MG_ETYPE); |
| 754 |
|
|
rad1 = atof(av[2]); |
| 755 |
greg |
1.3 |
round0(rad1); |
| 756 |
greg |
1.1 |
rad2 = atof(av[4]); |
| 757 |
greg |
1.3 |
round0(rad2); |
| 758 |
greg |
1.1 |
if (rad1 == 0.) { |
| 759 |
|
|
if (rad2 == 0.) |
| 760 |
|
|
return(MG_EILL); |
| 761 |
|
|
} else if (rad2 != 0.) { |
| 762 |
|
|
if (rad1 < 0. ^ rad2 < 0.) |
| 763 |
|
|
return(MG_EILL); |
| 764 |
|
|
} else { /* swap */ |
| 765 |
|
|
C_VERTEX *cv; |
| 766 |
|
|
|
| 767 |
|
|
cv = cv1; |
| 768 |
|
|
cv1 = cv2; |
| 769 |
|
|
cv2 = cv; |
| 770 |
|
|
d = rad1; |
| 771 |
|
|
rad1 = rad2; |
| 772 |
|
|
rad2 = d; |
| 773 |
|
|
} |
| 774 |
|
|
sgn = rad2 < 0. ? -1 : 1; |
| 775 |
|
|
/* initialize */ |
| 776 |
|
|
for (j = 0; j < 3; j++) |
| 777 |
|
|
w[j] = cv1->p[j] - cv2->p[j]; |
| 778 |
|
|
if ((d = normalize(w)) == 0.) |
| 779 |
|
|
return(MG_EILL); |
| 780 |
|
|
n1off = n2off = (rad2 - rad1)/d; |
| 781 |
greg |
1.3 |
if (warpconends) { /* hack for e_sph and e_torus */ |
| 782 |
|
|
d = atan(n2off) - (PI/4)/mg_nqcdivs; |
| 783 |
|
|
if (d <= -PI/2+FTINY) |
| 784 |
|
|
n2off = -FHUGE; |
| 785 |
|
|
else |
| 786 |
|
|
n2off = tan(d); |
| 787 |
|
|
} |
| 788 |
greg |
1.1 |
make_axes(u, v, w); |
| 789 |
|
|
for (j = 0; j < 3; j++) { |
| 790 |
|
|
sprintf(p3[j], FLTFMT, cv2->p[j] + rad2*u[j]); |
| 791 |
greg |
1.3 |
if (n2off <= -FHUGE) |
| 792 |
|
|
sprintf(n3[j], FLTFMT, -w[j]); |
| 793 |
|
|
else |
| 794 |
|
|
sprintf(n3[j], FLTFMT, u[j] + w[j]*n2off); |
| 795 |
greg |
1.1 |
} |
| 796 |
|
|
if ((rv = handle_it(MG_E_VERTEX, 3, v3ent)) != MG_OK) |
| 797 |
|
|
return(rv); |
| 798 |
|
|
if ((rv = handle_it(MG_E_POINT, 4, p3ent)) != MG_OK) |
| 799 |
|
|
return(rv); |
| 800 |
|
|
if ((rv = handle_it(MG_E_NORMAL, 4, n3ent)) != MG_OK) |
| 801 |
|
|
return(rv); |
| 802 |
|
|
if (rad1 == 0.) { /* triangles */ |
| 803 |
|
|
v1ent[3] = av[1]; |
| 804 |
|
|
if ((rv = handle_it(MG_E_VERTEX, 4, v1ent)) != MG_OK) |
| 805 |
|
|
return(rv); |
| 806 |
|
|
for (j = 0; j < 3; j++) |
| 807 |
|
|
sprintf(n4[j], FLTFMT, w[j]); |
| 808 |
|
|
if ((rv = handle_it(MG_E_NORMAL, 4, n4ent)) != MG_OK) |
| 809 |
|
|
return(rv); |
| 810 |
|
|
for (i = 1; i <= 4*mg_nqcdivs; i++) { |
| 811 |
|
|
theta = sgn*i*(PI/2)/mg_nqcdivs; |
| 812 |
|
|
if ((rv = handle_it(MG_E_VERTEX, 4, v2ent)) != MG_OK) |
| 813 |
|
|
return(rv); |
| 814 |
|
|
for (j = 0; j < 3; j++) { |
| 815 |
|
|
d = u[j]*cos(theta) + v[j]*sin(theta); |
| 816 |
|
|
sprintf(p3[j], FLTFMT, cv2->p[j] + rad2*d); |
| 817 |
greg |
1.3 |
if (n2off > -FHUGE) |
| 818 |
|
|
sprintf(n3[j], FLTFMT, d + w[j]*n2off); |
| 819 |
greg |
1.1 |
} |
| 820 |
greg |
1.3 |
if ((rv = handle_it(MG_E_VERTEX, 2, v3ent)) != MG_OK) |
| 821 |
greg |
1.1 |
return(rv); |
| 822 |
|
|
if ((rv = handle_it(MG_E_POINT, 4, p3ent)) != MG_OK) |
| 823 |
|
|
return(rv); |
| 824 |
greg |
1.3 |
if (n2off > -FHUGE && |
| 825 |
|
|
(rv = handle_it(MG_E_NORMAL, 4, n3ent)) != MG_OK) |
| 826 |
greg |
1.1 |
return(rv); |
| 827 |
|
|
if ((rv = handle_it(MG_E_FACE, 4, fent)) != MG_OK) |
| 828 |
|
|
return(rv); |
| 829 |
|
|
} |
| 830 |
|
|
} else { /* quads */ |
| 831 |
|
|
v1ent[3] = "_cv4"; |
| 832 |
greg |
1.3 |
if (warpconends) { /* hack for e_sph and e_torus */ |
| 833 |
|
|
d = atan(n1off) + (PI/4)/mg_nqcdivs; |
| 834 |
|
|
if (d >= PI/2-FTINY) |
| 835 |
|
|
n1off = FHUGE; |
| 836 |
|
|
else |
| 837 |
|
|
n1off = tan(atan(n1off)+(PI/4)/mg_nqcdivs); |
| 838 |
|
|
} |
| 839 |
greg |
1.1 |
for (j = 0; j < 3; j++) { |
| 840 |
|
|
sprintf(p4[j], FLTFMT, cv1->p[j] + rad1*u[j]); |
| 841 |
greg |
1.3 |
if (n1off >= FHUGE) |
| 842 |
|
|
sprintf(n4[j], FLTFMT, w[j]); |
| 843 |
|
|
else |
| 844 |
|
|
sprintf(n4[j], FLTFMT, u[j] + w[j]*n1off); |
| 845 |
greg |
1.1 |
} |
| 846 |
|
|
if ((rv = handle_it(MG_E_VERTEX, 3, v4ent)) != MG_OK) |
| 847 |
|
|
return(rv); |
| 848 |
|
|
if ((rv = handle_it(MG_E_POINT, 4, p4ent)) != MG_OK) |
| 849 |
|
|
return(rv); |
| 850 |
|
|
if ((rv = handle_it(MG_E_NORMAL, 4, n4ent)) != MG_OK) |
| 851 |
|
|
return(rv); |
| 852 |
|
|
for (i = 1; i <= 4*mg_nqcdivs; i++) { |
| 853 |
|
|
theta = sgn*i*(PI/2)/mg_nqcdivs; |
| 854 |
|
|
if ((rv = handle_it(MG_E_VERTEX, 4, v1ent)) != MG_OK) |
| 855 |
|
|
return(rv); |
| 856 |
|
|
if ((rv = handle_it(MG_E_VERTEX, 4, v2ent)) != MG_OK) |
| 857 |
|
|
return(rv); |
| 858 |
|
|
for (j = 0; j < 3; j++) { |
| 859 |
|
|
d = u[j]*cos(theta) + v[j]*sin(theta); |
| 860 |
|
|
sprintf(p3[j], FLTFMT, cv2->p[j] + rad2*d); |
| 861 |
greg |
1.3 |
if (n2off > -FHUGE) |
| 862 |
|
|
sprintf(n3[j], FLTFMT, d + w[j]*n2off); |
| 863 |
greg |
1.1 |
sprintf(p4[j], FLTFMT, cv1->p[j] + rad1*d); |
| 864 |
greg |
1.3 |
if (n1off < FHUGE) |
| 865 |
|
|
sprintf(n4[j], FLTFMT, d + w[j]*n1off); |
| 866 |
greg |
1.1 |
} |
| 867 |
greg |
1.3 |
if ((rv = handle_it(MG_E_VERTEX, 2, v3ent)) != MG_OK) |
| 868 |
greg |
1.1 |
return(rv); |
| 869 |
|
|
if ((rv = handle_it(MG_E_POINT, 4, p3ent)) != MG_OK) |
| 870 |
|
|
return(rv); |
| 871 |
greg |
1.3 |
if (n2off > -FHUGE && |
| 872 |
|
|
(rv = handle_it(MG_E_NORMAL, 4, n3ent)) != MG_OK) |
| 873 |
greg |
1.1 |
return(rv); |
| 874 |
greg |
1.3 |
if ((rv = handle_it(MG_E_VERTEX, 2, v4ent)) != MG_OK) |
| 875 |
greg |
1.1 |
return(rv); |
| 876 |
|
|
if ((rv = handle_it(MG_E_POINT, 4, p4ent)) != MG_OK) |
| 877 |
|
|
return(rv); |
| 878 |
greg |
1.3 |
if (n1off < FHUGE && |
| 879 |
|
|
(rv = handle_it(MG_E_NORMAL, 4, n4ent)) != MG_OK) |
| 880 |
greg |
1.1 |
return(rv); |
| 881 |
|
|
if ((rv = handle_it(MG_E_FACE, 5, fent)) != MG_OK) |
| 882 |
|
|
return(rv); |
| 883 |
|
|
} |
| 884 |
greg |
1.4 |
} |
| 885 |
|
|
return(MG_OK); |
| 886 |
|
|
} |
| 887 |
|
|
|
| 888 |
|
|
|
| 889 |
|
|
static int |
| 890 |
|
|
e_prism(ac, av) /* turn a prism into polygons */ |
| 891 |
|
|
int ac; |
| 892 |
|
|
char **av; |
| 893 |
|
|
{ |
| 894 |
|
|
static char p[3][24]; |
| 895 |
|
|
static char *vent[4] = {mg_ename[MG_E_VERTEX],NULL,"="}; |
| 896 |
|
|
static char *pent[5] = {mg_ename[MG_E_POINT],p[0],p[1],p[2]}; |
| 897 |
|
|
char *newav[MG_MAXARGC], nvn[MG_MAXARGC-1][8]; |
| 898 |
|
|
double length; |
| 899 |
|
|
FVECT v1, v2, v3, norm; |
| 900 |
|
|
register C_VERTEX *cv; |
| 901 |
|
|
C_VERTEX *cv0; |
| 902 |
|
|
int rv; |
| 903 |
|
|
register int i, j; |
| 904 |
|
|
|
| 905 |
|
|
if (ac < 5) |
| 906 |
|
|
return(MG_EARGC); |
| 907 |
greg |
1.5 |
if (!isflt(av[ac-1])) |
| 908 |
greg |
1.4 |
return(MG_ETYPE); |
| 909 |
greg |
1.5 |
length = atof(av[ac-1]); |
| 910 |
greg |
1.4 |
if (length <= FTINY && length >= -FTINY) |
| 911 |
|
|
return(MG_EILL); |
| 912 |
|
|
/* do bottom face */ |
| 913 |
|
|
newav[0] = mg_ename[MG_E_FACE]; |
| 914 |
|
|
for (i = 1; i < ac-1; i++) |
| 915 |
greg |
1.5 |
newav[i] = av[i]; |
| 916 |
greg |
1.4 |
newav[i] = NULL; |
| 917 |
|
|
if ((rv = handle_it(MG_E_FACE, i, newav)) != MG_OK) |
| 918 |
|
|
return(rv); |
| 919 |
|
|
/* compute face normal */ |
| 920 |
|
|
if ((cv0 = c_getvert(av[2])) == NULL) |
| 921 |
|
|
return(MG_EUNDEF); |
| 922 |
|
|
norm[0] = norm[1] = norm[2] = 0.; |
| 923 |
|
|
v1[0] = v1[1] = v1[2] = 0.; |
| 924 |
|
|
for (i = 2; i < ac-1; i++) { |
| 925 |
greg |
1.5 |
if ((cv = c_getvert(av[i])) == NULL) |
| 926 |
greg |
1.4 |
return(MG_EUNDEF); |
| 927 |
|
|
v2[0] = cv->p[0] - cv0->p[0]; |
| 928 |
|
|
v2[1] = cv->p[1] - cv0->p[1]; |
| 929 |
|
|
v2[2] = cv->p[2] - cv0->p[2]; |
| 930 |
|
|
fcross(v3, v1, v2); |
| 931 |
|
|
norm[0] += v3[0]; |
| 932 |
|
|
norm[1] += v3[1]; |
| 933 |
|
|
norm[2] += v3[2]; |
| 934 |
|
|
VCOPY(v1, v2); |
| 935 |
|
|
} |
| 936 |
|
|
if (normalize(norm) == 0.) |
| 937 |
|
|
return(MG_EILL); |
| 938 |
|
|
/* create moved vertices */ |
| 939 |
|
|
for (i = 1; i < ac-1; i++) { |
| 940 |
|
|
sprintf(nvn[i-1], "_pv%d", i); |
| 941 |
|
|
vent[1] = nvn[i-1]; |
| 942 |
|
|
if ((rv = handle_it(MG_E_VERTEX, 3, vent)) != MG_OK) |
| 943 |
|
|
return(rv); |
| 944 |
greg |
1.5 |
cv = c_getvert(av[i]); /* checked above */ |
| 945 |
greg |
1.4 |
for (j = 0; j < 3; j++) |
| 946 |
|
|
sprintf(p[j], FLTFMT, cv->p[j] - length*norm[j]); |
| 947 |
|
|
if ((rv = handle_it(MG_E_POINT, 4, pent)) != MG_OK) |
| 948 |
|
|
return(rv); |
| 949 |
|
|
newav[ac-1-i] = nvn[i-1]; /* reverse */ |
| 950 |
|
|
} |
| 951 |
|
|
/* do top face */ |
| 952 |
|
|
if ((rv = handle_it(MG_E_FACE, ac-1, newav)) != MG_OK) |
| 953 |
|
|
return(rv); |
| 954 |
|
|
/* do the side faces */ |
| 955 |
|
|
newav[5] = NULL; |
| 956 |
greg |
1.5 |
newav[3] = av[ac-2]; |
| 957 |
greg |
1.4 |
newav[4] = nvn[ac-3]; |
| 958 |
|
|
for (i = 1; i < ac-1; i++) { |
| 959 |
|
|
newav[1] = nvn[i-1]; |
| 960 |
greg |
1.5 |
newav[2] = av[i]; |
| 961 |
greg |
1.4 |
if ((rv = handle_it(MG_E_FACE, 5, newav)) != MG_OK) |
| 962 |
|
|
return(rv); |
| 963 |
|
|
newav[3] = newav[2]; |
| 964 |
|
|
newav[4] = newav[1]; |
| 965 |
greg |
1.1 |
} |
| 966 |
|
|
return(MG_OK); |
| 967 |
|
|
} |
