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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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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; /* entity 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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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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|
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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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int olen; |
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register char *cp; |
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|
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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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|
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|
247 |
void |
248 |
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); |
256 |
free((MEM_PTR)ctx->fname); |
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} |
258 |
|
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|
260 |
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 */ |
267 |
if (fseek(mg_file->fp, 0L, 0) == EOF) |
268 |
return(MG_ESEEK); |
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mg_file->lineno = 0; |
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return(MG_OK); |
271 |
} |
272 |
|
273 |
|
274 |
int |
275 |
mg_read() /* read next line from file */ |
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{ |
277 |
register int len = 0; |
278 |
|
279 |
do { |
280 |
if (fgets(mg_file->inpline+len, |
281 |
MG_MAXLINE-len, mg_file->fp) == NULL) |
282 |
return(len); |
283 |
mg_file->lineno++; |
284 |
len += strlen(mg_file->inpline+len); |
285 |
if (len > 1 && mg_file->inpline[len-2] == '\\') |
286 |
mg_file->inpline[--len-1] = ' '; |
287 |
} while (mg_file->inpline[len]); |
288 |
|
289 |
return(len); |
290 |
} |
291 |
|
292 |
|
293 |
int |
294 |
mg_parse() /* parse current input line */ |
295 |
{ |
296 |
char abuf[MG_MAXLINE]; |
297 |
char *argv[MG_MAXARGC]; |
298 |
int en; |
299 |
register char *cp, **ap; |
300 |
|
301 |
strcpy(cp=abuf, mg_file->inpline); |
302 |
ap = argv; /* break into words */ |
303 |
for ( ; ; ) { |
304 |
while (isspace(*cp)) |
305 |
*cp++ = '\0'; |
306 |
if (!*cp) |
307 |
break; |
308 |
if (ap - argv >= MG_MAXARGC-1) |
309 |
return(MG_EARGC); |
310 |
*ap++ = cp; |
311 |
while (*++cp && !isspace(*cp)) |
312 |
; |
313 |
} |
314 |
if (ap == argv) |
315 |
return(MG_OK); /* no words in line */ |
316 |
*ap = NULL; |
317 |
/* else handle it */ |
318 |
return(handle_it(-1, ap-argv, argv)); |
319 |
} |
320 |
|
321 |
|
322 |
int |
323 |
mg_load(fn) /* load an MGF file */ |
324 |
char *fn; |
325 |
{ |
326 |
MG_FCTXT cntxt; |
327 |
int rval; |
328 |
|
329 |
if ((rval = mg_open(&cntxt, fn)) != MG_OK) { |
330 |
fprintf(stderr, "%s: %s\n", fn, mg_err[rval]); |
331 |
return(rval); |
332 |
} |
333 |
while (mg_read()) /* parse each line */ |
334 |
if ((rval = mg_parse()) != MG_OK) { |
335 |
fprintf(stderr, "%s: %d: %s:\n%s", cntxt.fname, |
336 |
cntxt.lineno, mg_err[rval], |
337 |
cntxt.inpline); |
338 |
break; |
339 |
} |
340 |
mg_close(); |
341 |
return(rval); |
342 |
} |
343 |
|
344 |
|
345 |
void |
346 |
mg_clear() /* clear parser history */ |
347 |
{ |
348 |
c_clearall(); /* clear context tables */ |
349 |
mg_file = NULL; /* reset our context */ |
350 |
} |
351 |
|
352 |
|
353 |
int |
354 |
mg_iterate(ac, av, f) /* iterate on statement */ |
355 |
int ac; |
356 |
register char **av; |
357 |
int (*f)(); |
358 |
{ |
359 |
int niter, rval; |
360 |
register int i, j; |
361 |
char *argv[MG_MAXARGC]; |
362 |
char cntbuf[10]; |
363 |
/* build partial transformation */ |
364 |
for (i = 0; i < ac; i++) { |
365 |
if (av[i][0] == '-' && av[i][1] == 'a' && av[i][2] == '\0') |
366 |
break; |
367 |
argv[i+1] = av[i]; |
368 |
} |
369 |
argv[i+1] = NULL; |
370 |
if (i) { /* handle transformation */ |
371 |
argv[0] = mg_ename[MG_E_XF]; |
372 |
if ((rval = handle_it(MG_E_XF, i+1, argv)) != MG_OK) |
373 |
return(rval); |
374 |
} |
375 |
if (i < ac) { /* run array */ |
376 |
if (i+1 >= ac || !isint(av[i+1])) |
377 |
return(MG_ETYPE); |
378 |
niter = atoi(av[i+1]); |
379 |
argv[0] = mg_ename[MG_E_OBJECT]; |
380 |
argv[1] = cntbuf; |
381 |
for (j = 2; j+i < ac; j++) |
382 |
argv[j] = av[j+i]; |
383 |
argv[j] = NULL; |
384 |
for (j = 0; j < niter; j++) { |
385 |
sprintf(cntbuf, "%d", j); |
386 |
if ((rval = handle_it(MG_E_OBJECT, 2, argv)) != MG_OK) |
387 |
return(rval); |
388 |
argv[0] = "-i"; |
389 |
if ((rval = mg_iterate(ac-i, argv, f)) != MG_OK) |
390 |
return(rval); |
391 |
argv[0] = mg_ename[MG_E_OBJECT]; |
392 |
if ((rval = handle_it(MG_E_OBJECT, 1, argv)) != MG_OK) |
393 |
return(rval); |
394 |
} |
395 |
} else if ((rval = (*f)()) != MG_OK) /* else do this instance */ |
396 |
return(rval); |
397 |
if (i) { /* reset the transform */ |
398 |
argv[0] = mg_ename[MG_E_XF]; |
399 |
argv[1] = NULL; |
400 |
(void)handle_it(MG_E_XF, 1, argv); |
401 |
} |
402 |
return(MG_OK); |
403 |
} |
404 |
|
405 |
|
406 |
/**************************************************************************** |
407 |
* The following routines handle unsupported entities |
408 |
*/ |
409 |
|
410 |
|
411 |
static int |
412 |
e_any_toss(ac, av) /* discard an unwanted entity */ |
413 |
int ac; |
414 |
char **av; |
415 |
{ |
416 |
return(MG_OK); |
417 |
} |
418 |
|
419 |
|
420 |
static int |
421 |
reload_file() /* reload current MGF file */ |
422 |
{ |
423 |
register int rval; |
424 |
|
425 |
if ((rval = mg_rewind()) != MG_OK) |
426 |
return(rval); |
427 |
while (mg_read()) |
428 |
if ((rval = mg_parse()) != MG_OK) |
429 |
return(rval); |
430 |
return(MG_OK); |
431 |
} |
432 |
|
433 |
|
434 |
static int |
435 |
e_include(ac, av) /* include file */ |
436 |
int ac; |
437 |
char **av; |
438 |
{ |
439 |
MG_FCTXT ictx; |
440 |
int rv; |
441 |
|
442 |
if (ac < 2) |
443 |
return(MG_EARGC); |
444 |
if ((rv = mg_open(&ictx, av[1])) != MG_OK) |
445 |
return(rv); |
446 |
if ((rv = mg_iterate(ac-2, av+2, reload_file)) != MG_OK) { |
447 |
fprintf(stderr, "%s: %d: %s:\n%s", ictx.fname, |
448 |
ictx.lineno, mg_err[rv], ictx.inpline); |
449 |
mg_close(); |
450 |
return(MG_EINCL); |
451 |
} |
452 |
mg_close(); |
453 |
return(MG_OK); |
454 |
} |
455 |
|
456 |
|
457 |
static void |
458 |
make_axes(u, v, w) /* compute u and v given w (normalized) */ |
459 |
FVECT u, v, w; |
460 |
{ |
461 |
register int i; |
462 |
|
463 |
v[0] = v[1] = v[2] = 0.; |
464 |
for (i = 0; i < 3; i++) |
465 |
if (w[i] < .6 && w[i] > -.6) |
466 |
break; |
467 |
v[i] = 1.; |
468 |
fcross(u, v, w); |
469 |
normalize(u); |
470 |
fcross(v, w, u); |
471 |
} |
472 |
|
473 |
|
474 |
static int |
475 |
e_sph(ac, av) /* expand a sphere into cones */ |
476 |
int ac; |
477 |
char **av; |
478 |
{ |
479 |
static char p2x[24], p2y[24], p2z[24], r1[24], r2[24]; |
480 |
static char *v1ent[5] = {mg_ename[MG_E_VERTEX],"_sv1","=","_sv2"}; |
481 |
static char *v2ent[4] = {mg_ename[MG_E_VERTEX],"_sv2","="}; |
482 |
static char *p2ent[5] = {mg_ename[MG_E_POINT],p2x,p2y,p2z}; |
483 |
static char *conent[6] = {mg_ename[MG_E_CONE],"_sv1",r1,"_sv2",r2}; |
484 |
register C_VERTEX *cv; |
485 |
register int i; |
486 |
int rval; |
487 |
double rad; |
488 |
double theta; |
489 |
|
490 |
if (ac != 3) |
491 |
return(MG_EARGC); |
492 |
if ((cv = c_getvert(av[1])) == NULL) |
493 |
return(MG_EUNDEF); |
494 |
if (!isflt(av[2])) |
495 |
return(MG_ETYPE); |
496 |
rad = atof(av[2]); |
497 |
/* initialize */ |
498 |
warpconends = 1; |
499 |
if ((rval = handle_it(MG_E_VERTEX, 3, v2ent)) != MG_OK) |
500 |
return(rval); |
501 |
sprintf(p2x, FLTFMT, cv->p[0]); |
502 |
sprintf(p2y, FLTFMT, cv->p[1]); |
503 |
sprintf(p2z, FLTFMT, cv->p[2]+rad); |
504 |
if ((rval = handle_it(MG_E_POINT, 4, p2ent)) != MG_OK) |
505 |
return(rval); |
506 |
r2[0] = '0'; r2[1] = '\0'; |
507 |
for (i = 1; i <= 2*mg_nqcdivs; i++) { |
508 |
theta = i*(PI/2)/mg_nqcdivs; |
509 |
if ((rval = handle_it(MG_E_VERTEX, 4, v1ent)) != MG_OK) |
510 |
return(rval); |
511 |
sprintf(p2z, FLTFMT, cv->p[2]+rad*cos(theta)); |
512 |
if ((rval = handle_it(MG_E_VERTEX, 2, v2ent)) != MG_OK) |
513 |
return(rval); |
514 |
if ((rval = handle_it(MG_E_POINT, 4, p2ent)) != MG_OK) |
515 |
return(rval); |
516 |
strcpy(r1, r2); |
517 |
sprintf(r2, FLTFMT, rad*sin(theta)); |
518 |
if ((rval = handle_it(MG_E_CONE, 5, conent)) != MG_OK) |
519 |
return(rval); |
520 |
} |
521 |
warpconends = 0; |
522 |
return(MG_OK); |
523 |
} |
524 |
|
525 |
|
526 |
static int |
527 |
e_torus(ac, av) /* expand a torus into cones */ |
528 |
int ac; |
529 |
char **av; |
530 |
{ |
531 |
static char p2[3][24], r1[24], r2[24]; |
532 |
static char *v1ent[5] = {mg_ename[MG_E_VERTEX],"_tv1","=","_tv2"}; |
533 |
static char *v2ent[5] = {mg_ename[MG_E_VERTEX],"_tv2","="}; |
534 |
static char *p2ent[5] = {mg_ename[MG_E_POINT],p2[0],p2[1],p2[2]}; |
535 |
static char *conent[6] = {mg_ename[MG_E_CONE],"_tv1",r1,"_tv2",r2}; |
536 |
register C_VERTEX *cv; |
537 |
register int i, j; |
538 |
int rval; |
539 |
int sgn; |
540 |
double minrad, maxrad, avgrad; |
541 |
double theta; |
542 |
|
543 |
if (ac != 4) |
544 |
return(MG_EARGC); |
545 |
if ((cv = c_getvert(av[1])) == NULL) |
546 |
return(MG_EUNDEF); |
547 |
if (is0vect(cv->n)) |
548 |
return(MG_EILL); |
549 |
if (!isflt(av[2]) || !isflt(av[3])) |
550 |
return(MG_ETYPE); |
551 |
minrad = atof(av[2]); |
552 |
round0(minrad); |
553 |
maxrad = atof(av[3]); |
554 |
/* check orientation */ |
555 |
if (minrad > 0.) |
556 |
sgn = 1; |
557 |
else if (minrad < 0.) |
558 |
sgn = -1; |
559 |
else if (maxrad > 0.) |
560 |
sgn = 1; |
561 |
else if (maxrad < 0.) |
562 |
sgn = -1; |
563 |
else |
564 |
return(MG_EILL); |
565 |
if (sgn*(maxrad-minrad) <= 0.) |
566 |
return(MG_EILL); |
567 |
/* initialize */ |
568 |
warpconends = 1; |
569 |
v2ent[3] = av[1]; |
570 |
for (j = 0; j < 3; j++) |
571 |
sprintf(p2[j], FLTFMT, cv->p[j] + |
572 |
.5*sgn*(maxrad-minrad)*cv->n[j]); |
573 |
if ((rval = handle_it(MG_E_VERTEX, 4, v2ent)) != MG_OK) |
574 |
return(rval); |
575 |
if ((rval = handle_it(MG_E_POINT, 4, p2ent)) != MG_OK) |
576 |
return(rval); |
577 |
sprintf(r2, FLTFMT, avgrad=.5*(minrad+maxrad)); |
578 |
/* run outer section */ |
579 |
for (i = 1; i <= 2*mg_nqcdivs; i++) { |
580 |
theta = i*(PI/2)/mg_nqcdivs; |
581 |
if ((rval = handle_it(MG_E_VERTEX, 4, v1ent)) != MG_OK) |
582 |
return(rval); |
583 |
for (j = 0; j < 3; j++) |
584 |
sprintf(p2[j], FLTFMT, cv->p[j] + |
585 |
.5*sgn*(maxrad-minrad)*cos(theta)*cv->n[j]); |
586 |
if ((rval = handle_it(MG_E_VERTEX, 2, v2ent)) != MG_OK) |
587 |
return(rval); |
588 |
if ((rval = handle_it(MG_E_POINT, 4, p2ent)) != MG_OK) |
589 |
return(rval); |
590 |
strcpy(r1, r2); |
591 |
sprintf(r2, FLTFMT, avgrad + .5*(maxrad-minrad)*sin(theta)); |
592 |
if ((rval = handle_it(MG_E_CONE, 5, conent)) != MG_OK) |
593 |
return(rval); |
594 |
} |
595 |
/* run inner section */ |
596 |
sprintf(r2, FLTFMT, -.5*(minrad+maxrad)); |
597 |
for ( ; i <= 4*mg_nqcdivs; i++) { |
598 |
theta = i*(PI/2)/mg_nqcdivs; |
599 |
for (j = 0; j < 3; j++) |
600 |
sprintf(p2[j], FLTFMT, cv->p[j] + |
601 |
.5*sgn*(maxrad-minrad)*cos(theta)*cv->n[j]); |
602 |
if ((rval = handle_it(MG_E_VERTEX, 4, v1ent)) != MG_OK) |
603 |
return(rval); |
604 |
if ((rval = handle_it(MG_E_VERTEX, 2, v2ent)) != MG_OK) |
605 |
return(rval); |
606 |
if ((rval = handle_it(MG_E_POINT, 4, p2ent)) != MG_OK) |
607 |
return(rval); |
608 |
strcpy(r1, r2); |
609 |
sprintf(r2, FLTFMT, -avgrad - .5*(maxrad-minrad)*sin(theta)); |
610 |
if ((rval = handle_it(MG_E_CONE, 5, conent)) != MG_OK) |
611 |
return(rval); |
612 |
} |
613 |
warpconends = 0; |
614 |
return(MG_OK); |
615 |
} |
616 |
|
617 |
|
618 |
static int |
619 |
e_cyl(ac, av) /* replace a cylinder with equivalent cone */ |
620 |
int ac; |
621 |
char **av; |
622 |
{ |
623 |
static char *avnew[6] = {mg_ename[MG_E_CONE]}; |
624 |
|
625 |
if (ac != 4) |
626 |
return(MG_EARGC); |
627 |
avnew[1] = av[1]; |
628 |
avnew[2] = av[2]; |
629 |
avnew[3] = av[3]; |
630 |
avnew[4] = av[2]; |
631 |
return(handle_it(MG_E_CONE, 5, avnew)); |
632 |
} |
633 |
|
634 |
|
635 |
static int |
636 |
e_ring(ac, av) /* turn a ring into polygons */ |
637 |
int ac; |
638 |
char **av; |
639 |
{ |
640 |
static char p3[3][24], p4[3][24]; |
641 |
static char *nzent[5] = {mg_ename[MG_E_NORMAL],"0","0","0"}; |
642 |
static char *v1ent[5] = {mg_ename[MG_E_VERTEX],"_rv1","="}; |
643 |
static char *v2ent[5] = {mg_ename[MG_E_VERTEX],"_rv2","=","_rv3"}; |
644 |
static char *v3ent[4] = {mg_ename[MG_E_VERTEX],"_rv3","="}; |
645 |
static char *p3ent[5] = {mg_ename[MG_E_POINT],p3[0],p3[1],p3[2]}; |
646 |
static char *v4ent[4] = {mg_ename[MG_E_VERTEX],"_rv4","="}; |
647 |
static char *p4ent[5] = {mg_ename[MG_E_POINT],p4[0],p4[1],p4[2]}; |
648 |
static char *fent[6] = {mg_ename[MG_E_FACE],"_rv1","_rv2","_rv3","_rv4"}; |
649 |
register C_VERTEX *cv; |
650 |
register int i, j; |
651 |
FVECT u, v; |
652 |
double minrad, maxrad; |
653 |
int rv; |
654 |
double theta, d; |
655 |
|
656 |
if (ac != 4) |
657 |
return(MG_EARGC); |
658 |
if ((cv = c_getvert(av[1])) == NULL) |
659 |
return(MG_EUNDEF); |
660 |
if (is0vect(cv->n)) |
661 |
return(MG_EILL); |
662 |
if (!isflt(av[2]) || !isflt(av[3])) |
663 |
return(MG_ETYPE); |
664 |
minrad = atof(av[2]); |
665 |
round0(minrad); |
666 |
maxrad = atof(av[3]); |
667 |
if (minrad < 0. || maxrad <= minrad) |
668 |
return(MG_EILL); |
669 |
/* initialize */ |
670 |
make_axes(u, v, cv->n); |
671 |
for (j = 0; j < 3; j++) |
672 |
sprintf(p3[j], FLTFMT, cv->p[j] + maxrad*u[j]); |
673 |
if ((rv = handle_it(MG_E_VERTEX, 3, v3ent)) != MG_OK) |
674 |
return(rv); |
675 |
if ((rv = handle_it(MG_E_POINT, 4, p3ent)) != MG_OK) |
676 |
return(rv); |
677 |
if (minrad == 0.) { /* closed */ |
678 |
v1ent[3] = av[1]; |
679 |
if ((rv = handle_it(MG_E_VERTEX, 4, v1ent)) != MG_OK) |
680 |
return(rv); |
681 |
if ((rv = handle_it(MG_E_NORMAL, 4, nzent)) != MG_OK) |
682 |
return(rv); |
683 |
for (i = 1; i <= 4*mg_nqcdivs; i++) { |
684 |
theta = i*(PI/2)/mg_nqcdivs; |
685 |
if ((rv = handle_it(MG_E_VERTEX, 4, v2ent)) != MG_OK) |
686 |
return(rv); |
687 |
for (j = 0; j < 3; j++) |
688 |
sprintf(p3[j], FLTFMT, cv->p[j] + |
689 |
maxrad*u[j]*cos(theta) + |
690 |
maxrad*v[j]*sin(theta)); |
691 |
if ((rv = handle_it(MG_E_VERTEX, 2, v3ent)) != MG_OK) |
692 |
return(rv); |
693 |
if ((rv = handle_it(MG_E_POINT, 4, p3ent)) != MG_OK) |
694 |
return(rv); |
695 |
if ((rv = handle_it(MG_E_FACE, 4, fent)) != MG_OK) |
696 |
return(rv); |
697 |
} |
698 |
} else { /* open */ |
699 |
if ((rv = handle_it(MG_E_VERTEX, 3, v4ent)) != MG_OK) |
700 |
return(rv); |
701 |
for (j = 0; j < 3; j++) |
702 |
sprintf(p4[j], FLTFMT, cv->p[j] + minrad*u[j]); |
703 |
if ((rv = handle_it(MG_E_POINT, 4, p4ent)) != MG_OK) |
704 |
return(rv); |
705 |
v1ent[3] = "_rv4"; |
706 |
for (i = 1; i <= 4*mg_nqcdivs; i++) { |
707 |
theta = i*(PI/2)/mg_nqcdivs; |
708 |
if ((rv = handle_it(MG_E_VERTEX, 4, v1ent)) != MG_OK) |
709 |
return(rv); |
710 |
if ((rv = handle_it(MG_E_VERTEX, 4, v2ent)) != MG_OK) |
711 |
return(rv); |
712 |
for (j = 0; j < 3; j++) { |
713 |
d = u[j]*cos(theta) + v[j]*sin(theta); |
714 |
sprintf(p3[j], FLTFMT, cv->p[j] + maxrad*d); |
715 |
sprintf(p4[j], FLTFMT, cv->p[j] + minrad*d); |
716 |
} |
717 |
if ((rv = handle_it(MG_E_VERTEX, 2, v3ent)) != MG_OK) |
718 |
return(rv); |
719 |
if ((rv = handle_it(MG_E_POINT, 4, p3ent)) != MG_OK) |
720 |
return(rv); |
721 |
if ((rv = handle_it(MG_E_VERTEX, 2, v4ent)) != MG_OK) |
722 |
return(rv); |
723 |
if ((rv = handle_it(MG_E_POINT, 4, p4ent)) != MG_OK) |
724 |
return(rv); |
725 |
if ((rv = handle_it(MG_E_FACE, 5, fent)) != MG_OK) |
726 |
return(rv); |
727 |
} |
728 |
} |
729 |
return(MG_OK); |
730 |
} |
731 |
|
732 |
|
733 |
static int |
734 |
e_cone(ac, av) /* turn a cone into polygons */ |
735 |
int ac; |
736 |
char **av; |
737 |
{ |
738 |
static char p3[3][24], p4[3][24], n3[3][24], n4[3][24]; |
739 |
static char *v1ent[5] = {mg_ename[MG_E_VERTEX],"_cv1","="}; |
740 |
static char *v2ent[5] = {mg_ename[MG_E_VERTEX],"_cv2","=","_cv3"}; |
741 |
static char *v3ent[4] = {mg_ename[MG_E_VERTEX],"_cv3","="}; |
742 |
static char *p3ent[5] = {mg_ename[MG_E_POINT],p3[0],p3[1],p3[2]}; |
743 |
static char *n3ent[5] = {mg_ename[MG_E_NORMAL],n3[0],n3[1],n3[2]}; |
744 |
static char *v4ent[4] = {mg_ename[MG_E_VERTEX],"_cv4","="}; |
745 |
static char *p4ent[5] = {mg_ename[MG_E_POINT],p4[0],p4[1],p4[2]}; |
746 |
static char *n4ent[5] = {mg_ename[MG_E_NORMAL],n4[0],n4[1],n4[2]}; |
747 |
static char *fent[6] = {mg_ename[MG_E_FACE],"_cv1","_cv2","_cv3","_cv4"}; |
748 |
register C_VERTEX *cv1, *cv2; |
749 |
register int i, j; |
750 |
FVECT u, v, w; |
751 |
double rad1, rad2; |
752 |
int sgn; |
753 |
double n1off, n2off; |
754 |
double d; |
755 |
int rv; |
756 |
double theta; |
757 |
|
758 |
if (ac != 5) |
759 |
return(MG_EARGC); |
760 |
if ((cv1 = c_getvert(av[1])) == NULL || |
761 |
(cv2 = c_getvert(av[3])) == NULL) |
762 |
return(MG_EUNDEF); |
763 |
if (!isflt(av[2]) || !isflt(av[4])) |
764 |
return(MG_ETYPE); |
765 |
rad1 = atof(av[2]); |
766 |
round0(rad1); |
767 |
rad2 = atof(av[4]); |
768 |
round0(rad2); |
769 |
if (rad1 == 0.) { |
770 |
if (rad2 == 0.) |
771 |
return(MG_EILL); |
772 |
} else if (rad2 != 0.) { |
773 |
if (rad1 < 0. ^ rad2 < 0.) |
774 |
return(MG_EILL); |
775 |
} else { /* swap */ |
776 |
C_VERTEX *cv; |
777 |
|
778 |
cv = cv1; |
779 |
cv1 = cv2; |
780 |
cv2 = cv; |
781 |
d = rad1; |
782 |
rad1 = rad2; |
783 |
rad2 = d; |
784 |
} |
785 |
sgn = rad2 < 0. ? -1 : 1; |
786 |
/* initialize */ |
787 |
for (j = 0; j < 3; j++) |
788 |
w[j] = cv1->p[j] - cv2->p[j]; |
789 |
if ((d = normalize(w)) == 0.) |
790 |
return(MG_EILL); |
791 |
n1off = n2off = (rad2 - rad1)/d; |
792 |
if (warpconends) { /* hack for e_sph and e_torus */ |
793 |
d = atan(n2off) - (PI/4)/mg_nqcdivs; |
794 |
if (d <= -PI/2+FTINY) |
795 |
n2off = -FHUGE; |
796 |
else |
797 |
n2off = tan(d); |
798 |
} |
799 |
make_axes(u, v, w); |
800 |
for (j = 0; j < 3; j++) { |
801 |
sprintf(p3[j], FLTFMT, cv2->p[j] + rad2*u[j]); |
802 |
if (n2off <= -FHUGE) |
803 |
sprintf(n3[j], FLTFMT, -w[j]); |
804 |
else |
805 |
sprintf(n3[j], FLTFMT, u[j] + w[j]*n2off); |
806 |
} |
807 |
if ((rv = handle_it(MG_E_VERTEX, 3, v3ent)) != MG_OK) |
808 |
return(rv); |
809 |
if ((rv = handle_it(MG_E_POINT, 4, p3ent)) != MG_OK) |
810 |
return(rv); |
811 |
if ((rv = handle_it(MG_E_NORMAL, 4, n3ent)) != MG_OK) |
812 |
return(rv); |
813 |
if (rad1 == 0.) { /* triangles */ |
814 |
v1ent[3] = av[1]; |
815 |
if ((rv = handle_it(MG_E_VERTEX, 4, v1ent)) != MG_OK) |
816 |
return(rv); |
817 |
for (j = 0; j < 3; j++) |
818 |
sprintf(n4[j], FLTFMT, w[j]); |
819 |
if ((rv = handle_it(MG_E_NORMAL, 4, n4ent)) != MG_OK) |
820 |
return(rv); |
821 |
for (i = 1; i <= 4*mg_nqcdivs; i++) { |
822 |
theta = sgn*i*(PI/2)/mg_nqcdivs; |
823 |
if ((rv = handle_it(MG_E_VERTEX, 4, v2ent)) != MG_OK) |
824 |
return(rv); |
825 |
for (j = 0; j < 3; j++) { |
826 |
d = u[j]*cos(theta) + v[j]*sin(theta); |
827 |
sprintf(p3[j], FLTFMT, cv2->p[j] + rad2*d); |
828 |
if (n2off > -FHUGE) |
829 |
sprintf(n3[j], FLTFMT, d + w[j]*n2off); |
830 |
} |
831 |
if ((rv = handle_it(MG_E_VERTEX, 2, v3ent)) != MG_OK) |
832 |
return(rv); |
833 |
if ((rv = handle_it(MG_E_POINT, 4, p3ent)) != MG_OK) |
834 |
return(rv); |
835 |
if (n2off > -FHUGE && |
836 |
(rv = handle_it(MG_E_NORMAL, 4, n3ent)) != MG_OK) |
837 |
return(rv); |
838 |
if ((rv = handle_it(MG_E_FACE, 4, fent)) != MG_OK) |
839 |
return(rv); |
840 |
} |
841 |
} else { /* quads */ |
842 |
v1ent[3] = "_cv4"; |
843 |
if (warpconends) { /* hack for e_sph and e_torus */ |
844 |
d = atan(n1off) + (PI/4)/mg_nqcdivs; |
845 |
if (d >= PI/2-FTINY) |
846 |
n1off = FHUGE; |
847 |
else |
848 |
n1off = tan(atan(n1off)+(PI/4)/mg_nqcdivs); |
849 |
} |
850 |
for (j = 0; j < 3; j++) { |
851 |
sprintf(p4[j], FLTFMT, cv1->p[j] + rad1*u[j]); |
852 |
if (n1off >= FHUGE) |
853 |
sprintf(n4[j], FLTFMT, w[j]); |
854 |
else |
855 |
sprintf(n4[j], FLTFMT, u[j] + w[j]*n1off); |
856 |
} |
857 |
if ((rv = handle_it(MG_E_VERTEX, 3, v4ent)) != MG_OK) |
858 |
return(rv); |
859 |
if ((rv = handle_it(MG_E_POINT, 4, p4ent)) != MG_OK) |
860 |
return(rv); |
861 |
if ((rv = handle_it(MG_E_NORMAL, 4, n4ent)) != MG_OK) |
862 |
return(rv); |
863 |
for (i = 1; i <= 4*mg_nqcdivs; i++) { |
864 |
theta = sgn*i*(PI/2)/mg_nqcdivs; |
865 |
if ((rv = handle_it(MG_E_VERTEX, 4, v1ent)) != MG_OK) |
866 |
return(rv); |
867 |
if ((rv = handle_it(MG_E_VERTEX, 4, v2ent)) != MG_OK) |
868 |
return(rv); |
869 |
for (j = 0; j < 3; j++) { |
870 |
d = u[j]*cos(theta) + v[j]*sin(theta); |
871 |
sprintf(p3[j], FLTFMT, cv2->p[j] + rad2*d); |
872 |
if (n2off > -FHUGE) |
873 |
sprintf(n3[j], FLTFMT, d + w[j]*n2off); |
874 |
sprintf(p4[j], FLTFMT, cv1->p[j] + rad1*d); |
875 |
if (n1off < FHUGE) |
876 |
sprintf(n4[j], FLTFMT, d + w[j]*n1off); |
877 |
} |
878 |
if ((rv = handle_it(MG_E_VERTEX, 2, v3ent)) != MG_OK) |
879 |
return(rv); |
880 |
if ((rv = handle_it(MG_E_POINT, 4, p3ent)) != MG_OK) |
881 |
return(rv); |
882 |
if (n2off > -FHUGE && |
883 |
(rv = handle_it(MG_E_NORMAL, 4, n3ent)) != MG_OK) |
884 |
return(rv); |
885 |
if ((rv = handle_it(MG_E_VERTEX, 2, v4ent)) != MG_OK) |
886 |
return(rv); |
887 |
if ((rv = handle_it(MG_E_POINT, 4, p4ent)) != MG_OK) |
888 |
return(rv); |
889 |
if (n1off < FHUGE && |
890 |
(rv = handle_it(MG_E_NORMAL, 4, n4ent)) != MG_OK) |
891 |
return(rv); |
892 |
if ((rv = handle_it(MG_E_FACE, 5, fent)) != MG_OK) |
893 |
return(rv); |
894 |
} |
895 |
} |
896 |
return(MG_OK); |
897 |
} |
898 |
|
899 |
|
900 |
static int |
901 |
e_prism(ac, av) /* turn a prism into polygons */ |
902 |
int ac; |
903 |
char **av; |
904 |
{ |
905 |
static char p[3][24]; |
906 |
static char *vent[4] = {mg_ename[MG_E_VERTEX],NULL,"="}; |
907 |
static char *pent[5] = {mg_ename[MG_E_POINT],p[0],p[1],p[2]}; |
908 |
char *newav[MG_MAXARGC], nvn[MG_MAXARGC-1][8]; |
909 |
double length; |
910 |
FVECT v1, v2, v3, norm; |
911 |
register C_VERTEX *cv; |
912 |
C_VERTEX *cv0; |
913 |
int rv; |
914 |
register int i, j; |
915 |
|
916 |
if (ac < 5) |
917 |
return(MG_EARGC); |
918 |
if (!isflt(av[ac-1])) |
919 |
return(MG_ETYPE); |
920 |
length = atof(av[ac-1]); |
921 |
if (length <= FTINY && length >= -FTINY) |
922 |
return(MG_EILL); |
923 |
/* do bottom face */ |
924 |
newav[0] = mg_ename[MG_E_FACE]; |
925 |
for (i = 1; i < ac-1; i++) |
926 |
newav[i] = av[i]; |
927 |
newav[i] = NULL; |
928 |
if ((rv = handle_it(MG_E_FACE, i, newav)) != MG_OK) |
929 |
return(rv); |
930 |
/* compute face normal */ |
931 |
if ((cv0 = c_getvert(av[2])) == NULL) |
932 |
return(MG_EUNDEF); |
933 |
norm[0] = norm[1] = norm[2] = 0.; |
934 |
v1[0] = v1[1] = v1[2] = 0.; |
935 |
for (i = 2; i < ac-1; i++) { |
936 |
if ((cv = c_getvert(av[i])) == NULL) |
937 |
return(MG_EUNDEF); |
938 |
v2[0] = cv->p[0] - cv0->p[0]; |
939 |
v2[1] = cv->p[1] - cv0->p[1]; |
940 |
v2[2] = cv->p[2] - cv0->p[2]; |
941 |
fcross(v3, v1, v2); |
942 |
norm[0] += v3[0]; |
943 |
norm[1] += v3[1]; |
944 |
norm[2] += v3[2]; |
945 |
VCOPY(v1, v2); |
946 |
} |
947 |
if (normalize(norm) == 0.) |
948 |
return(MG_EILL); |
949 |
/* create moved vertices */ |
950 |
for (i = 1; i < ac-1; i++) { |
951 |
sprintf(nvn[i-1], "_pv%d", i); |
952 |
vent[1] = nvn[i-1]; |
953 |
if ((rv = handle_it(MG_E_VERTEX, 3, vent)) != MG_OK) |
954 |
return(rv); |
955 |
cv = c_getvert(av[i]); /* checked above */ |
956 |
for (j = 0; j < 3; j++) |
957 |
sprintf(p[j], FLTFMT, cv->p[j] - length*norm[j]); |
958 |
if ((rv = handle_it(MG_E_POINT, 4, pent)) != MG_OK) |
959 |
return(rv); |
960 |
newav[ac-1-i] = nvn[i-1]; /* reverse */ |
961 |
} |
962 |
/* do top face */ |
963 |
if ((rv = handle_it(MG_E_FACE, ac-1, newav)) != MG_OK) |
964 |
return(rv); |
965 |
/* do the side faces */ |
966 |
newav[5] = NULL; |
967 |
newav[3] = av[ac-2]; |
968 |
newav[4] = nvn[ac-3]; |
969 |
for (i = 1; i < ac-1; i++) { |
970 |
newav[1] = nvn[i-1]; |
971 |
newav[2] = av[i]; |
972 |
if ((rv = handle_it(MG_E_FACE, 5, newav)) != MG_OK) |
973 |
return(rv); |
974 |
newav[3] = newav[2]; |
975 |
newav[4] = newav[1]; |
976 |
} |
977 |
return(MG_OK); |
978 |
} |
979 |
|
980 |
|
981 |
static int |
982 |
e_cspec(ac, av) /* handle spectral color */ |
983 |
int ac; |
984 |
char **av; |
985 |
{ |
986 |
static char xbuf[24], ybuf[24]; |
987 |
static char *ccom[4] = {mg_ename[MG_E_CXY], xbuf, ybuf}; |
988 |
int rv; |
989 |
|
990 |
c_ccvt(c_ccolor, C_CSXY); |
991 |
/* if it's really their handler, use it */ |
992 |
if (mg_ehand[MG_E_CXY] != c_hcolor) { |
993 |
sprintf(xbuf, "%.4f", c_ccolor->cx); |
994 |
sprintf(ybuf, "%.4f", c_ccolor->cy); |
995 |
if ((rv = handle_it(MG_E_CXY, 3, ccom)) != MG_OK) |
996 |
return(rv); |
997 |
} |
998 |
return(MG_OK); |
999 |
} |
1000 |
|
1001 |
|
1002 |
static int |
1003 |
e_cmix(ac, av) /* handle mixing of colors */ |
1004 |
int ac; |
1005 |
char **av; |
1006 |
{ |
1007 |
char wl[2][6], vbuf[C_CNSS][24]; |
1008 |
char *newav[C_CNSS+4]; |
1009 |
int rv; |
1010 |
register int i; |
1011 |
/* |
1012 |
* Contorted logic works as follows: |
1013 |
* 1. the colors are already mixed in c_hcolor() support function |
1014 |
* 2. if we would handle a spectral result, make sure it's not |
1015 |
* 3. if c_hcolor() would handle a spectral result, don't bother |
1016 |
* 4. otherwise, make cspec entity and pass it to their handler |
1017 |
* 5. if we have only xy results, handle it as c_spec() would |
1018 |
*/ |
1019 |
if (mg_ehand[MG_E_CSPEC] == e_cspec) |
1020 |
c_ccvt(c_ccolor, C_CSXY); |
1021 |
else if (c_ccolor->flags & C_CDSPEC) { |
1022 |
if (mg_ehand[MG_E_CSPEC] != c_hcolor) { |
1023 |
sprintf(wl[0], "%d", C_CMINWL); |
1024 |
sprintf(wl[1], "%d", C_CMAXWL); |
1025 |
newav[0] = mg_ename[MG_E_CSPEC]; |
1026 |
newav[1] = wl[0]; |
1027 |
newav[2] = wl[1]; |
1028 |
for (i = 0; i < C_CNSS; i++) { |
1029 |
sprintf(vbuf[i], "%.6f", |
1030 |
(double)c_ccolor->ssamp[i] / |
1031 |
c_ccolor->ssum); |
1032 |
newav[i+3] = vbuf[i]; |
1033 |
} |
1034 |
newav[C_CNSS+3] = NULL; |
1035 |
if ((rv = handle_it(MG_E_CSPEC, C_CNSS+3, newav)) != MG_OK) |
1036 |
return(rv); |
1037 |
} |
1038 |
return(MG_OK); |
1039 |
} |
1040 |
if (mg_ehand[MG_E_CXY] != c_hcolor) { |
1041 |
sprintf(vbuf[0], "%.4f", c_ccolor->cx); |
1042 |
sprintf(vbuf[1], "%.4f", c_ccolor->cy); |
1043 |
newav[0] = mg_ename[MG_E_CXY]; |
1044 |
newav[1] = vbuf[0]; |
1045 |
newav[2] = vbuf[1]; |
1046 |
newav[3] = NULL; |
1047 |
if ((rv = handle_it(MG_E_CXY, 3, newav)) != MG_OK) |
1048 |
return(rv); |
1049 |
} |
1050 |
return(MG_OK); |
1051 |
} |