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/* Copyright (c) 1994 Regents of the University of California */ |
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|
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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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/* |
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* Parse an MGF file, converting or discarding unsupported entities |
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*/ |
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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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/* |
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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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|
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char mg_ename[MG_NENTITIES][MG_MAXELEN] = MG_NAMELIST; |
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|
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/* Handler routines for each entity */ |
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|
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int (*mg_ehand[MG_NENTITIES])(); |
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|
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/* error messages */ |
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|
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char *mg_err[MG_NERRS] = MG_ERRLIST; |
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|
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MG_FCTXT *mg_file; /* current file context pointer */ |
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|
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int mg_nqcdivs = MG_NQCD; /* number of divisions per quarter circle */ |
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|
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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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|
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/* temporary settings for testing */ |
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#define e_ies e_any_toss |
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/* alternate handler routines */ |
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|
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static int e_any_toss(), /* discard unneeded entity */ |
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e_ies(), /* IES luminaire file */ |
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e_include(), /* include file */ |
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e_sph(), /* sphere */ |
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e_cmix(), /* color mixtures */ |
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e_cspec(), /* color spectra */ |
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e_cyl(), /* cylinder */ |
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e_cone(), /* cone */ |
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e_prism(), /* prism */ |
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e_ring(), /* ring */ |
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e_torus(); /* torus */ |
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|
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/* alternate handler support functions */ |
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|
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static int (*e_supp[MG_NENTITIES])(); |
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|
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static char FLTFMT[] = "%.12g"; |
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|
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static int warpconends; /* hack for generating good normals */ |
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|
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|
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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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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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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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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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ineed |= 1<<MG_E_COLOR|1<<MG_E_CXY|1<<MG_E_CSPEC|1<<MG_E_CMIX; |
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} |
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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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ineed |= 1<<MG_E_COLOR|1<<MG_E_CXY|1<<MG_E_CSPEC|1<<MG_E_CMIX; |
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} |
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} |
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/* 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 || mg_ehand[MG_E_CSPEC] != NULL || |
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mg_ehand[MG_E_CMIX] != 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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mg_ehand[MG_E_SIDES] != 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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if (ineed & 1<<MG_E_COLOR && mg_ehand[MG_E_COLOR] != c_hcolor) |
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e_supp[MG_E_COLOR] = c_hcolor; |
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if (ineed & 1<<MG_E_CXY && mg_ehand[MG_E_CXY] != c_hcolor) |
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e_supp[MG_E_CXY] = c_hcolor; |
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if (ineed & 1<<MG_E_CSPEC && mg_ehand[MG_E_CSPEC] != c_hcolor) |
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e_supp[MG_E_CSPEC] = c_hcolor; |
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if (ineed & 1<<MG_E_CMIX && mg_ehand[MG_E_CMIX] != c_hcolor) |
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e_supp[MG_E_CMIX] = c_hcolor; |
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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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|
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|
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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 = LU_SINIT(NULL,NULL); /* lookup table */ |
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register char *cp; |
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|
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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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|
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|
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int |
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mg_handle(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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|
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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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|
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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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static int nfids; |
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int olen; |
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register char *cp; |
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|
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ctx->fid = ++nfids; |
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ctx->lineno = 0; |
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if (fn == NULL) { |
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strcpy(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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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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return(MG_ENOFILE); |
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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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|
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|
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void |
246 |
mg_close() /* close input file */ |
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{ |
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register MG_FCTXT *ctx = mg_file; |
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|
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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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} |
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|
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|
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void |
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mg_fgetpos(pos) /* get current position in input file */ |
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register MG_FPOS *pos; |
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{ |
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extern long ftell(); |
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|
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pos->fid = mg_file->fid; |
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pos->lineno = mg_file->lineno; |
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pos->offset = ftell(mg_file->fp); |
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} |
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|
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|
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int |
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mg_fgoto(pos) /* reposition input file pointer */ |
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register MG_FPOS *pos; |
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{ |
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if (pos->fid != mg_file->fid) |
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return(MG_ESEEK); |
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if (pos->lineno == mg_file->lineno) |
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return(MG_OK); |
277 |
if (mg_file->fp == stdin) |
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return(MG_ESEEK); /* cannot seek on standard input */ |
279 |
if (fseek(mg_file->fp, pos->offset, 0) == EOF) |
280 |
return(MG_ESEEK); |
281 |
mg_file->lineno = pos->lineno; |
282 |
return(MG_OK); |
283 |
} |
284 |
|
285 |
|
286 |
int |
287 |
mg_read() /* read next line from file */ |
288 |
{ |
289 |
register int len = 0; |
290 |
|
291 |
do { |
292 |
if (fgets(mg_file->inpline+len, |
293 |
MG_MAXLINE-len, mg_file->fp) == NULL) |
294 |
return(len); |
295 |
mg_file->lineno++; |
296 |
len += strlen(mg_file->inpline+len); |
297 |
if (len > 1 && mg_file->inpline[len-2] == '\\') |
298 |
mg_file->inpline[--len-1] = ' '; |
299 |
} while (mg_file->inpline[len]); |
300 |
|
301 |
return(len); |
302 |
} |
303 |
|
304 |
|
305 |
int |
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mg_parse() /* parse current input line */ |
307 |
{ |
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char abuf[MG_MAXLINE]; |
309 |
char *argv[MG_MAXARGC]; |
310 |
int en; |
311 |
register char *cp, **ap; |
312 |
|
313 |
strcpy(cp=abuf, mg_file->inpline); |
314 |
ap = argv; /* break into words */ |
315 |
for ( ; ; ) { |
316 |
while (isspace(*cp)) |
317 |
*cp++ = '\0'; |
318 |
if (!*cp) |
319 |
break; |
320 |
if (ap - argv >= MG_MAXARGC-1) |
321 |
return(MG_EARGC); |
322 |
*ap++ = cp; |
323 |
while (*++cp && !isspace(*cp)) |
324 |
; |
325 |
} |
326 |
if (ap == argv) |
327 |
return(MG_OK); /* no words in line */ |
328 |
*ap = NULL; |
329 |
/* else handle it */ |
330 |
return(mg_handle(-1, ap-argv, argv)); |
331 |
} |
332 |
|
333 |
|
334 |
int |
335 |
mg_load(fn) /* load an MGF file */ |
336 |
char *fn; |
337 |
{ |
338 |
MG_FCTXT cntxt; |
339 |
int rval; |
340 |
|
341 |
if ((rval = mg_open(&cntxt, fn)) != MG_OK) { |
342 |
fprintf(stderr, "%s: %s\n", fn, mg_err[rval]); |
343 |
return(rval); |
344 |
} |
345 |
while (mg_read()) /* parse each line */ |
346 |
if ((rval = mg_parse()) != MG_OK) { |
347 |
fprintf(stderr, "%s: %d: %s:\n%s", cntxt.fname, |
348 |
cntxt.lineno, mg_err[rval], |
349 |
cntxt.inpline); |
350 |
break; |
351 |
} |
352 |
mg_close(); |
353 |
return(rval); |
354 |
} |
355 |
|
356 |
|
357 |
void |
358 |
mg_clear() /* clear parser history */ |
359 |
{ |
360 |
c_clearall(); /* clear context tables */ |
361 |
mg_file = NULL; /* reset our context */ |
362 |
} |
363 |
|
364 |
|
365 |
/**************************************************************************** |
366 |
* The following routines handle unsupported entities |
367 |
*/ |
368 |
|
369 |
|
370 |
static int |
371 |
e_any_toss(ac, av) /* discard an unwanted entity */ |
372 |
int ac; |
373 |
char **av; |
374 |
{ |
375 |
return(MG_OK); |
376 |
} |
377 |
|
378 |
|
379 |
static int |
380 |
e_include(ac, av) /* include file */ |
381 |
int ac; |
382 |
char **av; |
383 |
{ |
384 |
char *xfarg[MG_MAXARGC]; |
385 |
MG_FCTXT ictx; |
386 |
int rv; |
387 |
|
388 |
if (ac < 2) |
389 |
return(MG_EARGC); |
390 |
if ((rv = mg_open(&ictx, av[1])) != MG_OK) |
391 |
return(rv); |
392 |
if (ac > 2) { |
393 |
register int i; |
394 |
|
395 |
xfarg[0] = mg_ename[MG_E_XF]; |
396 |
for (i = 1; i < ac-1; i++) |
397 |
xfarg[i] = av[i+1]; |
398 |
xfarg[ac-1] = NULL; |
399 |
if ((rv = mg_handle(MG_E_XF, ac-1, xfarg)) != MG_OK) |
400 |
return(rv); |
401 |
} |
402 |
while (!feof(mg_file->fp)) { |
403 |
while (mg_read()) |
404 |
if ((rv = mg_parse()) != MG_OK) { |
405 |
fprintf(stderr, "%s: %d: %s:\n%s", ictx.fname, |
406 |
ictx.lineno, mg_err[rv], |
407 |
ictx.inpline); |
408 |
mg_close(); |
409 |
return(MG_EINCL); |
410 |
} |
411 |
if (ac > 2) |
412 |
if ((rv = mg_handle(MG_E_XF, 1, xfarg)) != MG_OK) |
413 |
return(rv); |
414 |
} |
415 |
mg_close(); |
416 |
return(MG_OK); |
417 |
} |
418 |
|
419 |
|
420 |
static void |
421 |
make_axes(u, v, w) /* compute u and v given w (normalized) */ |
422 |
FVECT u, v, w; |
423 |
{ |
424 |
register int i; |
425 |
|
426 |
v[0] = v[1] = v[2] = 0.; |
427 |
for (i = 0; i < 3; i++) |
428 |
if (w[i] < .6 && w[i] > -.6) |
429 |
break; |
430 |
v[i] = 1.; |
431 |
fcross(u, v, w); |
432 |
normalize(u); |
433 |
fcross(v, w, u); |
434 |
} |
435 |
|
436 |
|
437 |
static int |
438 |
e_sph(ac, av) /* expand a sphere into cones */ |
439 |
int ac; |
440 |
char **av; |
441 |
{ |
442 |
static char p2x[24], p2y[24], p2z[24], r1[24], r2[24]; |
443 |
static char *v1ent[5] = {mg_ename[MG_E_VERTEX],"_sv1","=","_sv2"}; |
444 |
static char *v2ent[4] = {mg_ename[MG_E_VERTEX],"_sv2","="}; |
445 |
static char *p2ent[5] = {mg_ename[MG_E_POINT],p2x,p2y,p2z}; |
446 |
static char *conent[6] = {mg_ename[MG_E_CONE],"_sv1",r1,"_sv2",r2}; |
447 |
register C_VERTEX *cv; |
448 |
register int i; |
449 |
int rval; |
450 |
double rad; |
451 |
double theta; |
452 |
|
453 |
if (ac != 3) |
454 |
return(MG_EARGC); |
455 |
if ((cv = c_getvert(av[1])) == NULL) |
456 |
return(MG_EUNDEF); |
457 |
if (!isflt(av[2])) |
458 |
return(MG_ETYPE); |
459 |
rad = atof(av[2]); |
460 |
/* initialize */ |
461 |
warpconends = 1; |
462 |
if ((rval = mg_handle(MG_E_VERTEX, 3, v2ent)) != MG_OK) |
463 |
return(rval); |
464 |
sprintf(p2x, FLTFMT, cv->p[0]); |
465 |
sprintf(p2y, FLTFMT, cv->p[1]); |
466 |
sprintf(p2z, FLTFMT, cv->p[2]+rad); |
467 |
if ((rval = mg_handle(MG_E_POINT, 4, p2ent)) != MG_OK) |
468 |
return(rval); |
469 |
r2[0] = '0'; r2[1] = '\0'; |
470 |
for (i = 1; i <= 2*mg_nqcdivs; i++) { |
471 |
theta = i*(PI/2)/mg_nqcdivs; |
472 |
if ((rval = mg_handle(MG_E_VERTEX, 4, v1ent)) != MG_OK) |
473 |
return(rval); |
474 |
sprintf(p2z, FLTFMT, cv->p[2]+rad*cos(theta)); |
475 |
if ((rval = mg_handle(MG_E_VERTEX, 2, v2ent)) != MG_OK) |
476 |
return(rval); |
477 |
if ((rval = mg_handle(MG_E_POINT, 4, p2ent)) != MG_OK) |
478 |
return(rval); |
479 |
strcpy(r1, r2); |
480 |
sprintf(r2, FLTFMT, rad*sin(theta)); |
481 |
if ((rval = mg_handle(MG_E_CONE, 5, conent)) != MG_OK) |
482 |
return(rval); |
483 |
} |
484 |
warpconends = 0; |
485 |
return(MG_OK); |
486 |
} |
487 |
|
488 |
|
489 |
static int |
490 |
e_torus(ac, av) /* expand a torus into cones */ |
491 |
int ac; |
492 |
char **av; |
493 |
{ |
494 |
static char p2[3][24], r1[24], r2[24]; |
495 |
static char *v1ent[5] = {mg_ename[MG_E_VERTEX],"_tv1","=","_tv2"}; |
496 |
static char *v2ent[5] = {mg_ename[MG_E_VERTEX],"_tv2","="}; |
497 |
static char *p2ent[5] = {mg_ename[MG_E_POINT],p2[0],p2[1],p2[2]}; |
498 |
static char *conent[6] = {mg_ename[MG_E_CONE],"_tv1",r1,"_tv2",r2}; |
499 |
register C_VERTEX *cv; |
500 |
register int i, j; |
501 |
int rval; |
502 |
int sgn; |
503 |
double minrad, maxrad, avgrad; |
504 |
double theta; |
505 |
|
506 |
if (ac != 4) |
507 |
return(MG_EARGC); |
508 |
if ((cv = c_getvert(av[1])) == NULL) |
509 |
return(MG_EUNDEF); |
510 |
if (is0vect(cv->n)) |
511 |
return(MG_EILL); |
512 |
if (!isflt(av[2]) || !isflt(av[3])) |
513 |
return(MG_ETYPE); |
514 |
minrad = atof(av[2]); |
515 |
round0(minrad); |
516 |
maxrad = atof(av[3]); |
517 |
/* check orientation */ |
518 |
if (minrad > 0.) |
519 |
sgn = 1; |
520 |
else if (minrad < 0.) |
521 |
sgn = -1; |
522 |
else if (maxrad > 0.) |
523 |
sgn = 1; |
524 |
else if (maxrad < 0.) |
525 |
sgn = -1; |
526 |
else |
527 |
return(MG_EILL); |
528 |
if (sgn*(maxrad-minrad) <= 0.) |
529 |
return(MG_EILL); |
530 |
/* initialize */ |
531 |
warpconends = 1; |
532 |
v2ent[3] = av[1]; |
533 |
for (j = 0; j < 3; j++) |
534 |
sprintf(p2[j], FLTFMT, cv->p[j] + |
535 |
.5*sgn*(maxrad-minrad)*cv->n[j]); |
536 |
if ((rval = mg_handle(MG_E_VERTEX, 4, v2ent)) != MG_OK) |
537 |
return(rval); |
538 |
if ((rval = mg_handle(MG_E_POINT, 4, p2ent)) != MG_OK) |
539 |
return(rval); |
540 |
sprintf(r2, FLTFMT, avgrad=.5*(minrad+maxrad)); |
541 |
/* run outer section */ |
542 |
for (i = 1; i <= 2*mg_nqcdivs; i++) { |
543 |
theta = i*(PI/2)/mg_nqcdivs; |
544 |
if ((rval = mg_handle(MG_E_VERTEX, 4, v1ent)) != MG_OK) |
545 |
return(rval); |
546 |
for (j = 0; j < 3; j++) |
547 |
sprintf(p2[j], FLTFMT, cv->p[j] + |
548 |
.5*sgn*(maxrad-minrad)*cos(theta)*cv->n[j]); |
549 |
if ((rval = mg_handle(MG_E_VERTEX, 2, v2ent)) != MG_OK) |
550 |
return(rval); |
551 |
if ((rval = mg_handle(MG_E_POINT, 4, p2ent)) != MG_OK) |
552 |
return(rval); |
553 |
strcpy(r1, r2); |
554 |
sprintf(r2, FLTFMT, avgrad + .5*(maxrad-minrad)*sin(theta)); |
555 |
if ((rval = mg_handle(MG_E_CONE, 5, conent)) != MG_OK) |
556 |
return(rval); |
557 |
} |
558 |
/* run inner section */ |
559 |
sprintf(r2, FLTFMT, -.5*(minrad+maxrad)); |
560 |
for ( ; i <= 4*mg_nqcdivs; i++) { |
561 |
theta = i*(PI/2)/mg_nqcdivs; |
562 |
for (j = 0; j < 3; j++) |
563 |
sprintf(p2[j], FLTFMT, cv->p[j] + |
564 |
.5*sgn*(maxrad-minrad)*cos(theta)*cv->n[j]); |
565 |
if ((rval = mg_handle(MG_E_VERTEX, 4, v1ent)) != MG_OK) |
566 |
return(rval); |
567 |
if ((rval = mg_handle(MG_E_VERTEX, 2, v2ent)) != MG_OK) |
568 |
return(rval); |
569 |
if ((rval = mg_handle(MG_E_POINT, 4, p2ent)) != MG_OK) |
570 |
return(rval); |
571 |
strcpy(r1, r2); |
572 |
sprintf(r2, FLTFMT, -avgrad - .5*(maxrad-minrad)*sin(theta)); |
573 |
if ((rval = mg_handle(MG_E_CONE, 5, conent)) != MG_OK) |
574 |
return(rval); |
575 |
} |
576 |
warpconends = 0; |
577 |
return(MG_OK); |
578 |
} |
579 |
|
580 |
|
581 |
static int |
582 |
e_cyl(ac, av) /* replace a cylinder with equivalent cone */ |
583 |
int ac; |
584 |
char **av; |
585 |
{ |
586 |
static char *avnew[6] = {mg_ename[MG_E_CONE]}; |
587 |
|
588 |
if (ac != 4) |
589 |
return(MG_EARGC); |
590 |
avnew[1] = av[1]; |
591 |
avnew[2] = av[2]; |
592 |
avnew[3] = av[3]; |
593 |
avnew[4] = av[2]; |
594 |
return(mg_handle(MG_E_CONE, 5, avnew)); |
595 |
} |
596 |
|
597 |
|
598 |
static int |
599 |
e_ring(ac, av) /* turn a ring into polygons */ |
600 |
int ac; |
601 |
char **av; |
602 |
{ |
603 |
static char p3[3][24], p4[3][24]; |
604 |
static char *nzent[5] = {mg_ename[MG_E_NORMAL],"0","0","0"}; |
605 |
static char *v1ent[5] = {mg_ename[MG_E_VERTEX],"_rv1","="}; |
606 |
static char *v2ent[5] = {mg_ename[MG_E_VERTEX],"_rv2","=","_rv3"}; |
607 |
static char *v3ent[4] = {mg_ename[MG_E_VERTEX],"_rv3","="}; |
608 |
static char *p3ent[5] = {mg_ename[MG_E_POINT],p3[0],p3[1],p3[2]}; |
609 |
static char *v4ent[4] = {mg_ename[MG_E_VERTEX],"_rv4","="}; |
610 |
static char *p4ent[5] = {mg_ename[MG_E_POINT],p4[0],p4[1],p4[2]}; |
611 |
static char *fent[6] = {mg_ename[MG_E_FACE],"_rv1","_rv2","_rv3","_rv4"}; |
612 |
register C_VERTEX *cv; |
613 |
register int i, j; |
614 |
FVECT u, v; |
615 |
double minrad, maxrad; |
616 |
int rv; |
617 |
double theta, d; |
618 |
|
619 |
if (ac != 4) |
620 |
return(MG_EARGC); |
621 |
if ((cv = c_getvert(av[1])) == NULL) |
622 |
return(MG_EUNDEF); |
623 |
if (is0vect(cv->n)) |
624 |
return(MG_EILL); |
625 |
if (!isflt(av[2]) || !isflt(av[3])) |
626 |
return(MG_ETYPE); |
627 |
minrad = atof(av[2]); |
628 |
round0(minrad); |
629 |
maxrad = atof(av[3]); |
630 |
if (minrad < 0. || maxrad <= minrad) |
631 |
return(MG_EILL); |
632 |
/* initialize */ |
633 |
make_axes(u, v, cv->n); |
634 |
for (j = 0; j < 3; j++) |
635 |
sprintf(p3[j], FLTFMT, cv->p[j] + maxrad*u[j]); |
636 |
if ((rv = mg_handle(MG_E_VERTEX, 3, v3ent)) != MG_OK) |
637 |
return(rv); |
638 |
if ((rv = mg_handle(MG_E_POINT, 4, p3ent)) != MG_OK) |
639 |
return(rv); |
640 |
if (minrad == 0.) { /* closed */ |
641 |
v1ent[3] = av[1]; |
642 |
if ((rv = mg_handle(MG_E_VERTEX, 4, v1ent)) != MG_OK) |
643 |
return(rv); |
644 |
if ((rv = mg_handle(MG_E_NORMAL, 4, nzent)) != MG_OK) |
645 |
return(rv); |
646 |
for (i = 1; i <= 4*mg_nqcdivs; i++) { |
647 |
theta = i*(PI/2)/mg_nqcdivs; |
648 |
if ((rv = mg_handle(MG_E_VERTEX, 4, v2ent)) != MG_OK) |
649 |
return(rv); |
650 |
for (j = 0; j < 3; j++) |
651 |
sprintf(p3[j], FLTFMT, cv->p[j] + |
652 |
maxrad*u[j]*cos(theta) + |
653 |
maxrad*v[j]*sin(theta)); |
654 |
if ((rv = mg_handle(MG_E_VERTEX, 2, v3ent)) != MG_OK) |
655 |
return(rv); |
656 |
if ((rv = mg_handle(MG_E_POINT, 4, p3ent)) != MG_OK) |
657 |
return(rv); |
658 |
if ((rv = mg_handle(MG_E_FACE, 4, fent)) != MG_OK) |
659 |
return(rv); |
660 |
} |
661 |
} else { /* open */ |
662 |
if ((rv = mg_handle(MG_E_VERTEX, 3, v4ent)) != MG_OK) |
663 |
return(rv); |
664 |
for (j = 0; j < 3; j++) |
665 |
sprintf(p4[j], FLTFMT, cv->p[j] + minrad*u[j]); |
666 |
if ((rv = mg_handle(MG_E_POINT, 4, p4ent)) != MG_OK) |
667 |
return(rv); |
668 |
v1ent[3] = "_rv4"; |
669 |
for (i = 1; i <= 4*mg_nqcdivs; i++) { |
670 |
theta = i*(PI/2)/mg_nqcdivs; |
671 |
if ((rv = mg_handle(MG_E_VERTEX, 4, v1ent)) != MG_OK) |
672 |
return(rv); |
673 |
if ((rv = mg_handle(MG_E_VERTEX, 4, v2ent)) != MG_OK) |
674 |
return(rv); |
675 |
for (j = 0; j < 3; j++) { |
676 |
d = u[j]*cos(theta) + v[j]*sin(theta); |
677 |
sprintf(p3[j], FLTFMT, cv->p[j] + maxrad*d); |
678 |
sprintf(p4[j], FLTFMT, cv->p[j] + minrad*d); |
679 |
} |
680 |
if ((rv = mg_handle(MG_E_VERTEX, 2, v3ent)) != MG_OK) |
681 |
return(rv); |
682 |
if ((rv = mg_handle(MG_E_POINT, 4, p3ent)) != MG_OK) |
683 |
return(rv); |
684 |
if ((rv = mg_handle(MG_E_VERTEX, 2, v4ent)) != MG_OK) |
685 |
return(rv); |
686 |
if ((rv = mg_handle(MG_E_POINT, 4, p4ent)) != MG_OK) |
687 |
return(rv); |
688 |
if ((rv = mg_handle(MG_E_FACE, 5, fent)) != MG_OK) |
689 |
return(rv); |
690 |
} |
691 |
} |
692 |
return(MG_OK); |
693 |
} |
694 |
|
695 |
|
696 |
static int |
697 |
e_cone(ac, av) /* turn a cone into polygons */ |
698 |
int ac; |
699 |
char **av; |
700 |
{ |
701 |
static char p3[3][24], p4[3][24], n3[3][24], n4[3][24]; |
702 |
static char *v1ent[5] = {mg_ename[MG_E_VERTEX],"_cv1","="}; |
703 |
static char *v2ent[5] = {mg_ename[MG_E_VERTEX],"_cv2","=","_cv3"}; |
704 |
static char *v3ent[4] = {mg_ename[MG_E_VERTEX],"_cv3","="}; |
705 |
static char *p3ent[5] = {mg_ename[MG_E_POINT],p3[0],p3[1],p3[2]}; |
706 |
static char *n3ent[5] = {mg_ename[MG_E_NORMAL],n3[0],n3[1],n3[2]}; |
707 |
static char *v4ent[4] = {mg_ename[MG_E_VERTEX],"_cv4","="}; |
708 |
static char *p4ent[5] = {mg_ename[MG_E_POINT],p4[0],p4[1],p4[2]}; |
709 |
static char *n4ent[5] = {mg_ename[MG_E_NORMAL],n4[0],n4[1],n4[2]}; |
710 |
static char *fent[6] = {mg_ename[MG_E_FACE],"_cv1","_cv2","_cv3","_cv4"}; |
711 |
register C_VERTEX *cv1, *cv2; |
712 |
register int i, j; |
713 |
FVECT u, v, w; |
714 |
double rad1, rad2; |
715 |
int sgn; |
716 |
double n1off, n2off; |
717 |
double d; |
718 |
int rv; |
719 |
double theta; |
720 |
|
721 |
if (ac != 5) |
722 |
return(MG_EARGC); |
723 |
if ((cv1 = c_getvert(av[1])) == NULL || |
724 |
(cv2 = c_getvert(av[3])) == NULL) |
725 |
return(MG_EUNDEF); |
726 |
if (!isflt(av[2]) || !isflt(av[4])) |
727 |
return(MG_ETYPE); |
728 |
rad1 = atof(av[2]); |
729 |
round0(rad1); |
730 |
rad2 = atof(av[4]); |
731 |
round0(rad2); |
732 |
if (rad1 == 0.) { |
733 |
if (rad2 == 0.) |
734 |
return(MG_EILL); |
735 |
} else if (rad2 != 0.) { |
736 |
if (rad1 < 0. ^ rad2 < 0.) |
737 |
return(MG_EILL); |
738 |
} else { /* swap */ |
739 |
C_VERTEX *cv; |
740 |
|
741 |
cv = cv1; |
742 |
cv1 = cv2; |
743 |
cv2 = cv; |
744 |
d = rad1; |
745 |
rad1 = rad2; |
746 |
rad2 = d; |
747 |
} |
748 |
sgn = rad2 < 0. ? -1 : 1; |
749 |
/* initialize */ |
750 |
for (j = 0; j < 3; j++) |
751 |
w[j] = cv1->p[j] - cv2->p[j]; |
752 |
if ((d = normalize(w)) == 0.) |
753 |
return(MG_EILL); |
754 |
n1off = n2off = (rad2 - rad1)/d; |
755 |
if (warpconends) { /* hack for e_sph and e_torus */ |
756 |
d = atan(n2off) - (PI/4)/mg_nqcdivs; |
757 |
if (d <= -PI/2+FTINY) |
758 |
n2off = -FHUGE; |
759 |
else |
760 |
n2off = tan(d); |
761 |
} |
762 |
make_axes(u, v, w); |
763 |
for (j = 0; j < 3; j++) { |
764 |
sprintf(p3[j], FLTFMT, cv2->p[j] + rad2*u[j]); |
765 |
if (n2off <= -FHUGE) |
766 |
sprintf(n3[j], FLTFMT, -w[j]); |
767 |
else |
768 |
sprintf(n3[j], FLTFMT, u[j] + w[j]*n2off); |
769 |
} |
770 |
if ((rv = mg_handle(MG_E_VERTEX, 3, v3ent)) != MG_OK) |
771 |
return(rv); |
772 |
if ((rv = mg_handle(MG_E_POINT, 4, p3ent)) != MG_OK) |
773 |
return(rv); |
774 |
if ((rv = mg_handle(MG_E_NORMAL, 4, n3ent)) != MG_OK) |
775 |
return(rv); |
776 |
if (rad1 == 0.) { /* triangles */ |
777 |
v1ent[3] = av[1]; |
778 |
if ((rv = mg_handle(MG_E_VERTEX, 4, v1ent)) != MG_OK) |
779 |
return(rv); |
780 |
for (j = 0; j < 3; j++) |
781 |
sprintf(n4[j], FLTFMT, w[j]); |
782 |
if ((rv = mg_handle(MG_E_NORMAL, 4, n4ent)) != MG_OK) |
783 |
return(rv); |
784 |
for (i = 1; i <= 4*mg_nqcdivs; i++) { |
785 |
theta = sgn*i*(PI/2)/mg_nqcdivs; |
786 |
if ((rv = mg_handle(MG_E_VERTEX, 4, v2ent)) != MG_OK) |
787 |
return(rv); |
788 |
for (j = 0; j < 3; j++) { |
789 |
d = u[j]*cos(theta) + v[j]*sin(theta); |
790 |
sprintf(p3[j], FLTFMT, cv2->p[j] + rad2*d); |
791 |
if (n2off > -FHUGE) |
792 |
sprintf(n3[j], FLTFMT, d + w[j]*n2off); |
793 |
} |
794 |
if ((rv = mg_handle(MG_E_VERTEX, 2, v3ent)) != MG_OK) |
795 |
return(rv); |
796 |
if ((rv = mg_handle(MG_E_POINT, 4, p3ent)) != MG_OK) |
797 |
return(rv); |
798 |
if (n2off > -FHUGE && |
799 |
(rv = mg_handle(MG_E_NORMAL, 4, n3ent)) != MG_OK) |
800 |
return(rv); |
801 |
if ((rv = mg_handle(MG_E_FACE, 4, fent)) != MG_OK) |
802 |
return(rv); |
803 |
} |
804 |
} else { /* quads */ |
805 |
v1ent[3] = "_cv4"; |
806 |
if (warpconends) { /* hack for e_sph and e_torus */ |
807 |
d = atan(n1off) + (PI/4)/mg_nqcdivs; |
808 |
if (d >= PI/2-FTINY) |
809 |
n1off = FHUGE; |
810 |
else |
811 |
n1off = tan(atan(n1off)+(PI/4)/mg_nqcdivs); |
812 |
} |
813 |
for (j = 0; j < 3; j++) { |
814 |
sprintf(p4[j], FLTFMT, cv1->p[j] + rad1*u[j]); |
815 |
if (n1off >= FHUGE) |
816 |
sprintf(n4[j], FLTFMT, w[j]); |
817 |
else |
818 |
sprintf(n4[j], FLTFMT, u[j] + w[j]*n1off); |
819 |
} |
820 |
if ((rv = mg_handle(MG_E_VERTEX, 3, v4ent)) != MG_OK) |
821 |
return(rv); |
822 |
if ((rv = mg_handle(MG_E_POINT, 4, p4ent)) != MG_OK) |
823 |
return(rv); |
824 |
if ((rv = mg_handle(MG_E_NORMAL, 4, n4ent)) != MG_OK) |
825 |
return(rv); |
826 |
for (i = 1; i <= 4*mg_nqcdivs; i++) { |
827 |
theta = sgn*i*(PI/2)/mg_nqcdivs; |
828 |
if ((rv = mg_handle(MG_E_VERTEX, 4, v1ent)) != MG_OK) |
829 |
return(rv); |
830 |
if ((rv = mg_handle(MG_E_VERTEX, 4, v2ent)) != MG_OK) |
831 |
return(rv); |
832 |
for (j = 0; j < 3; j++) { |
833 |
d = u[j]*cos(theta) + v[j]*sin(theta); |
834 |
sprintf(p3[j], FLTFMT, cv2->p[j] + rad2*d); |
835 |
if (n2off > -FHUGE) |
836 |
sprintf(n3[j], FLTFMT, d + w[j]*n2off); |
837 |
sprintf(p4[j], FLTFMT, cv1->p[j] + rad1*d); |
838 |
if (n1off < FHUGE) |
839 |
sprintf(n4[j], FLTFMT, d + w[j]*n1off); |
840 |
} |
841 |
if ((rv = mg_handle(MG_E_VERTEX, 2, v3ent)) != MG_OK) |
842 |
return(rv); |
843 |
if ((rv = mg_handle(MG_E_POINT, 4, p3ent)) != MG_OK) |
844 |
return(rv); |
845 |
if (n2off > -FHUGE && |
846 |
(rv = mg_handle(MG_E_NORMAL, 4, n3ent)) != MG_OK) |
847 |
return(rv); |
848 |
if ((rv = mg_handle(MG_E_VERTEX, 2, v4ent)) != MG_OK) |
849 |
return(rv); |
850 |
if ((rv = mg_handle(MG_E_POINT, 4, p4ent)) != MG_OK) |
851 |
return(rv); |
852 |
if (n1off < FHUGE && |
853 |
(rv = mg_handle(MG_E_NORMAL, 4, n4ent)) != MG_OK) |
854 |
return(rv); |
855 |
if ((rv = mg_handle(MG_E_FACE, 5, fent)) != MG_OK) |
856 |
return(rv); |
857 |
} |
858 |
} |
859 |
return(MG_OK); |
860 |
} |
861 |
|
862 |
|
863 |
static int |
864 |
e_prism(ac, av) /* turn a prism into polygons */ |
865 |
int ac; |
866 |
char **av; |
867 |
{ |
868 |
static char p[3][24]; |
869 |
static char *vent[4] = {mg_ename[MG_E_VERTEX],NULL,"="}; |
870 |
static char *pent[5] = {mg_ename[MG_E_POINT],p[0],p[1],p[2]}; |
871 |
char *newav[MG_MAXARGC], nvn[MG_MAXARGC-1][8]; |
872 |
double length; |
873 |
FVECT v1, v2, v3, norm; |
874 |
register C_VERTEX *cv; |
875 |
C_VERTEX *cv0; |
876 |
int rv; |
877 |
register int i, j; |
878 |
|
879 |
if (ac < 5) |
880 |
return(MG_EARGC); |
881 |
if (!isflt(av[ac-1])) |
882 |
return(MG_ETYPE); |
883 |
length = atof(av[ac-1]); |
884 |
if (length <= FTINY && length >= -FTINY) |
885 |
return(MG_EILL); |
886 |
/* do bottom face */ |
887 |
newav[0] = mg_ename[MG_E_FACE]; |
888 |
for (i = 1; i < ac-1; i++) |
889 |
newav[i] = av[i]; |
890 |
newav[i] = NULL; |
891 |
if ((rv = mg_handle(MG_E_FACE, i, newav)) != MG_OK) |
892 |
return(rv); |
893 |
/* compute face normal */ |
894 |
if ((cv0 = c_getvert(av[1])) == NULL) |
895 |
return(MG_EUNDEF); |
896 |
norm[0] = norm[1] = norm[2] = 0.; |
897 |
v1[0] = v1[1] = v1[2] = 0.; |
898 |
for (i = 2; i < ac-1; i++) { |
899 |
if ((cv = c_getvert(av[i])) == NULL) |
900 |
return(MG_EUNDEF); |
901 |
v2[0] = cv->p[0] - cv0->p[0]; |
902 |
v2[1] = cv->p[1] - cv0->p[1]; |
903 |
v2[2] = cv->p[2] - cv0->p[2]; |
904 |
fcross(v3, v1, v2); |
905 |
norm[0] += v3[0]; |
906 |
norm[1] += v3[1]; |
907 |
norm[2] += v3[2]; |
908 |
VCOPY(v1, v2); |
909 |
} |
910 |
if (normalize(norm) == 0.) |
911 |
return(MG_EILL); |
912 |
/* create moved vertices */ |
913 |
for (i = 1; i < ac-1; i++) { |
914 |
sprintf(nvn[i-1], "_pv%d", i); |
915 |
vent[1] = nvn[i-1]; |
916 |
if ((rv = mg_handle(MG_E_VERTEX, 3, vent)) != MG_OK) |
917 |
return(rv); |
918 |
cv = c_getvert(av[i]); /* checked above */ |
919 |
for (j = 0; j < 3; j++) |
920 |
sprintf(p[j], FLTFMT, cv->p[j] - length*norm[j]); |
921 |
if ((rv = mg_handle(MG_E_POINT, 4, pent)) != MG_OK) |
922 |
return(rv); |
923 |
newav[ac-1-i] = nvn[i-1]; /* reverse */ |
924 |
} |
925 |
/* do top face */ |
926 |
if ((rv = mg_handle(MG_E_FACE, ac-1, newav)) != MG_OK) |
927 |
return(rv); |
928 |
/* do the side faces */ |
929 |
newav[5] = NULL; |
930 |
newav[3] = av[ac-2]; |
931 |
newav[4] = nvn[ac-3]; |
932 |
for (i = 1; i < ac-1; i++) { |
933 |
newav[1] = nvn[i-1]; |
934 |
newav[2] = av[i]; |
935 |
if ((rv = mg_handle(MG_E_FACE, 5, newav)) != MG_OK) |
936 |
return(rv); |
937 |
newav[3] = newav[2]; |
938 |
newav[4] = newav[1]; |
939 |
} |
940 |
return(MG_OK); |
941 |
} |
942 |
|
943 |
|
944 |
static int |
945 |
e_cspec(ac, av) /* handle spectral color */ |
946 |
int ac; |
947 |
char **av; |
948 |
{ |
949 |
static char xbuf[24], ybuf[24]; |
950 |
static char *ccom[4] = {mg_ename[MG_E_CXY], xbuf, ybuf}; |
951 |
int rv; |
952 |
|
953 |
c_ccvt(c_ccolor, C_CSXY); |
954 |
/* if it's really their handler, use it */ |
955 |
if (mg_ehand[MG_E_CXY] != c_hcolor) { |
956 |
sprintf(xbuf, "%.4f", c_ccolor->cx); |
957 |
sprintf(ybuf, "%.4f", c_ccolor->cy); |
958 |
if ((rv = mg_handle(MG_E_CXY, 3, ccom)) != MG_OK) |
959 |
return(rv); |
960 |
} |
961 |
return(MG_OK); |
962 |
} |
963 |
|
964 |
|
965 |
static int |
966 |
e_cmix(ac, av) /* handle mixing of colors */ |
967 |
int ac; |
968 |
char **av; |
969 |
{ |
970 |
char wl[2][6], vbuf[C_CNSS][24]; |
971 |
char *newav[C_CNSS+4]; |
972 |
int rv; |
973 |
register int i; |
974 |
/* |
975 |
* Contorted logic works as follows: |
976 |
* 1. the colors are already mixed in c_hcolor() support function |
977 |
* 2. if we would handle a spectral result, make sure it's not |
978 |
* 3. if c_hcolor() would handle a spectral result, don't bother |
979 |
* 4. otherwise, make cspec entity and pass it to their handler |
980 |
* 5. if we have only xy results, handle it as c_spec() would |
981 |
*/ |
982 |
if (mg_ehand[MG_E_CSPEC] == e_cspec) |
983 |
c_ccvt(c_ccolor, C_CSXY); |
984 |
else if (c_ccolor->flags & C_CDSPEC) { |
985 |
if (mg_ehand[MG_E_CSPEC] != c_hcolor) { |
986 |
sprintf(wl[0], "%d", C_CMINWL); |
987 |
sprintf(wl[1], "%d", C_CMAXWL); |
988 |
newav[0] = mg_ename[MG_E_CSPEC]; |
989 |
newav[1] = wl[0]; |
990 |
newav[2] = wl[1]; |
991 |
for (i = 0; i < C_CNSS; i++) { |
992 |
sprintf(vbuf[i], "%.6f", |
993 |
(double)c_ccolor->ssamp[i] / |
994 |
c_ccolor->ssum); |
995 |
newav[i+3] = vbuf[i]; |
996 |
} |
997 |
newav[C_CNSS+3] = NULL; |
998 |
if ((rv = mg_handle(MG_E_CSPEC, C_CNSS+3, newav)) != MG_OK) |
999 |
return(rv); |
1000 |
} |
1001 |
return(MG_OK); |
1002 |
} |
1003 |
if (mg_ehand[MG_E_CXY] != c_hcolor) { |
1004 |
sprintf(vbuf[0], "%.4f", c_ccolor->cx); |
1005 |
sprintf(vbuf[1], "%.4f", c_ccolor->cy); |
1006 |
newav[0] = mg_ename[MG_E_CXY]; |
1007 |
newav[1] = vbuf[0]; |
1008 |
newav[2] = vbuf[1]; |
1009 |
newav[3] = NULL; |
1010 |
if ((rv = mg_handle(MG_E_CXY, 3, newav)) != MG_OK) |
1011 |
return(rv); |
1012 |
} |
1013 |
return(MG_OK); |
1014 |
} |