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#ifndef lint |
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static const char RCSid[] = "$Id: mgf_context.c,v 3.1 2011/02/18 00:40:25 greg Exp $"; |
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#endif |
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/* |
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* Context handlers |
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*/ |
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|
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include "mgf_parser.h" |
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#include "lookup.h" |
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|
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/* default context values */ |
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static C_MATERIAL c_dfmaterial = C_DEFMATERIAL; |
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static C_VERTEX c_dfvertex = C_DEFVERTEX; |
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|
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/* the unnamed contexts */ |
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static C_COLOR c_uncolor = C_DEFCOLOR; |
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static C_MATERIAL c_unmaterial = C_DEFMATERIAL; |
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static C_VERTEX c_unvertex = C_DEFVERTEX; |
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|
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/* the current contexts */ |
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C_COLOR *c_ccolor = &c_uncolor; |
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char *c_ccname = NULL; |
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C_MATERIAL *c_cmaterial = &c_unmaterial; |
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char *c_cmname = NULL; |
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C_VERTEX *c_cvertex = &c_unvertex; |
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char *c_cvname = NULL; |
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|
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static LUTAB clr_tab = LU_SINIT(free,free); /* color lookup table */ |
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static LUTAB mat_tab = LU_SINIT(free,free); /* material lookup table */ |
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static LUTAB vtx_tab = LU_SINIT(free,free); /* vertex lookup table */ |
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|
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static int setspectrum(C_COLOR *, int ac, char **av); |
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|
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|
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int |
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c_hcolor(int ac, char **av) /* handle color entity */ |
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{ |
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double w, wsum; |
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int i; |
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LUENT *lp; |
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|
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switch (mg_entity(av[0])) { |
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case MG_E_COLOR: /* get/set color context */ |
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if (ac > 4) |
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return(MG_EARGC); |
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if (ac == 1) { /* set unnamed color context */ |
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c_uncolor = c_dfcolor; |
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c_ccolor = &c_uncolor; |
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c_ccname = NULL; |
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return(MG_OK); |
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} |
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if (!isname(av[1])) |
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return(MG_EILL); |
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lp = lu_find(&clr_tab, av[1]); /* lookup context */ |
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if (lp == NULL) |
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return(MG_EMEM); |
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c_ccname = lp->key; |
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c_ccolor = (C_COLOR *)lp->data; |
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if (ac == 2) { /* reestablish previous context */ |
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if (c_ccolor == NULL) |
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return(MG_EUNDEF); |
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return(MG_OK); |
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} |
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if (av[2][0] != '=' || av[2][1]) |
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return(MG_ETYPE); |
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if (c_ccolor == NULL) { /* create new color context */ |
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lp->key = (char *)malloc(strlen(av[1])+1); |
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if (lp->key == NULL) |
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return(MG_EMEM); |
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strcpy(lp->key, av[1]); |
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lp->data = (char *)malloc(sizeof(C_COLOR)); |
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if (lp->data == NULL) |
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return(MG_EMEM); |
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c_ccname = lp->key; |
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c_ccolor = (C_COLOR *)lp->data; |
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c_ccolor->clock = 0; |
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c_ccolor->client_data = NULL; |
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} |
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i = c_ccolor->clock; |
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if (ac == 3) { /* use default template */ |
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*c_ccolor = c_dfcolor; |
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c_ccolor->clock = i + 1; |
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return(MG_OK); |
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} |
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lp = lu_find(&clr_tab, av[3]); /* lookup template */ |
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if (lp == NULL) |
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return(MG_EMEM); |
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if (lp->data == NULL) |
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return(MG_EUNDEF); |
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*c_ccolor = *(C_COLOR *)lp->data; |
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c_ccolor->clock = i + 1; |
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return(MG_OK); |
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case MG_E_CXY: /* assign CIE XY value */ |
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if (ac != 3) |
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return(MG_EARGC); |
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if (!isflt(av[1]) | !isflt(av[2])) |
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return(MG_ETYPE); |
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c_ccolor->cx = atof(av[1]); |
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c_ccolor->cy = atof(av[2]); |
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c_ccolor->flags = C_CDXY|C_CSXY; |
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if ((c_ccolor->cx < 0.) | (c_ccolor->cy < 0.) | |
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(c_ccolor->cx + c_ccolor->cy > 1.)) |
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return(MG_EILL); |
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c_ccolor->clock++; |
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return(MG_OK); |
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case MG_E_CSPEC: /* assign spectral values */ |
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return(setspectrum(c_ccolor, ac-1, av+1)); |
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case MG_E_CCT: /* assign black body spectrum */ |
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if (ac != 2) |
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return(MG_EARGC); |
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if (!isflt(av[1])) |
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return(MG_ETYPE); |
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if (!c_bbtemp(c_ccolor, atof(av[1]))) |
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return(MG_EILL); |
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c_ccolor->clock++; |
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return(MG_OK); |
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case MG_E_CMIX: /* mix colors */ |
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if (ac < 5 || (ac-1)%2) |
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return(MG_EARGC); |
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if (!isflt(av[1])) |
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return(MG_ETYPE); |
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wsum = atof(av[1]); |
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if ((lp = lu_find(&clr_tab, av[2])) == NULL) |
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return(MG_EMEM); |
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if (lp->data == NULL) |
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return(MG_EUNDEF); |
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*c_ccolor = *(C_COLOR *)lp->data; |
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for (i = 3; i < ac; i += 2) { |
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if (!isflt(av[i])) |
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return(MG_ETYPE); |
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w = atof(av[i]); |
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if ((lp = lu_find(&clr_tab, av[i+1])) == NULL) |
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return(MG_EMEM); |
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if (lp->data == NULL) |
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return(MG_EUNDEF); |
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c_cmix(c_ccolor, wsum, c_ccolor, |
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w, (C_COLOR *)lp->data); |
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wsum += w; |
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} |
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if (wsum <= 0.) |
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return(MG_EILL); |
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c_ccolor->clock++; |
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return(MG_OK); |
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} |
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return(MG_EUNK); |
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} |
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|
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|
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int |
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c_hmaterial(int ac, char **av) /* handle material entity */ |
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{ |
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int i; |
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LUENT *lp; |
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|
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switch (mg_entity(av[0])) { |
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case MG_E_MATERIAL: /* get/set material context */ |
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if (ac > 4) |
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return(MG_EARGC); |
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if (ac == 1) { /* set unnamed material context */ |
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c_unmaterial = c_dfmaterial; |
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c_cmaterial = &c_unmaterial; |
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c_cmname = NULL; |
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return(MG_OK); |
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} |
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if (!isname(av[1])) |
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return(MG_EILL); |
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lp = lu_find(&mat_tab, av[1]); /* lookup context */ |
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if (lp == NULL) |
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return(MG_EMEM); |
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c_cmname = lp->key; |
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c_cmaterial = (C_MATERIAL *)lp->data; |
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if (ac == 2) { /* reestablish previous context */ |
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if (c_cmaterial == NULL) |
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return(MG_EUNDEF); |
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return(MG_OK); |
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} |
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if (av[2][0] != '=' || av[2][1]) |
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return(MG_ETYPE); |
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if (c_cmaterial == NULL) { /* create new material */ |
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lp->key = (char *)malloc(strlen(av[1])+1); |
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if (lp->key == NULL) |
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return(MG_EMEM); |
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strcpy(lp->key, av[1]); |
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lp->data = (char *)malloc(sizeof(C_MATERIAL)); |
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if (lp->data == NULL) |
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return(MG_EMEM); |
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c_cmname = lp->key; |
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c_cmaterial = (C_MATERIAL *)lp->data; |
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c_cmaterial->clock = 0; |
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c_cmaterial->client_data = NULL; |
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} |
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i = c_cmaterial->clock; |
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if (ac == 3) { /* use default template */ |
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*c_cmaterial = c_dfmaterial; |
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c_cmaterial->clock = i + 1; |
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return(MG_OK); |
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} |
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lp = lu_find(&mat_tab, av[3]); /* lookup template */ |
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if (lp == NULL) |
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return(MG_EMEM); |
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if (lp->data == NULL) |
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return(MG_EUNDEF); |
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*c_cmaterial = *(C_MATERIAL *)lp->data; |
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c_cmaterial->clock = i + 1; |
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return(MG_OK); |
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case MG_E_IR: /* set index of refraction */ |
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if (ac != 3) |
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return(MG_EARGC); |
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if (!isflt(av[1]) | !isflt(av[2])) |
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return(MG_ETYPE); |
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c_cmaterial->nr = atof(av[1]); |
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c_cmaterial->ni = atof(av[2]); |
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if (c_cmaterial->nr <= FTINY) |
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return(MG_EILL); |
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c_cmaterial->clock++; |
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return(MG_OK); |
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case MG_E_RD: /* set diffuse reflectance */ |
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if (ac != 2) |
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return(MG_EARGC); |
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if (!isflt(av[1])) |
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return(MG_ETYPE); |
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c_cmaterial->rd = atof(av[1]); |
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if ((c_cmaterial->rd < 0.) | (c_cmaterial->rd > 1.)) |
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return(MG_EILL); |
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c_cmaterial->rd_c = *c_ccolor; |
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c_cmaterial->clock++; |
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return(MG_OK); |
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case MG_E_ED: /* set diffuse emittance */ |
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if (ac != 2) |
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return(MG_EARGC); |
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if (!isflt(av[1])) |
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return(MG_ETYPE); |
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c_cmaterial->ed = atof(av[1]); |
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if (c_cmaterial->ed < 0.) |
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return(MG_EILL); |
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c_cmaterial->ed_c = *c_ccolor; |
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c_cmaterial->clock++; |
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return(MG_OK); |
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case MG_E_TD: /* set diffuse transmittance */ |
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if (ac != 2) |
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return(MG_EARGC); |
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if (!isflt(av[1])) |
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return(MG_ETYPE); |
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c_cmaterial->td = atof(av[1]); |
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if ((c_cmaterial->td < 0.) | (c_cmaterial->td > 1.)) |
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return(MG_EILL); |
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c_cmaterial->td_c = *c_ccolor; |
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c_cmaterial->clock++; |
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return(MG_OK); |
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case MG_E_RS: /* set specular reflectance */ |
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if (ac != 3) |
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return(MG_EARGC); |
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if (!isflt(av[1]) | !isflt(av[2])) |
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return(MG_ETYPE); |
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c_cmaterial->rs = atof(av[1]); |
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c_cmaterial->rs_a = atof(av[2]); |
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if ((c_cmaterial->rs < 0.) | (c_cmaterial->rs > 1.) | |
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(c_cmaterial->rs_a < 0.)) |
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return(MG_EILL); |
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c_cmaterial->rs_c = *c_ccolor; |
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c_cmaterial->clock++; |
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return(MG_OK); |
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case MG_E_TS: /* set specular transmittance */ |
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if (ac != 3) |
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return(MG_EARGC); |
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if (!isflt(av[1]) | !isflt(av[2])) |
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return(MG_ETYPE); |
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c_cmaterial->ts = atof(av[1]); |
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c_cmaterial->ts_a = atof(av[2]); |
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if ((c_cmaterial->ts < 0.) | (c_cmaterial->ts > 1.) | |
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(c_cmaterial->ts_a < 0.)) |
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return(MG_EILL); |
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c_cmaterial->ts_c = *c_ccolor; |
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c_cmaterial->clock++; |
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return(MG_OK); |
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case MG_E_SIDES: /* set number of sides */ |
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if (ac != 2) |
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return(MG_EARGC); |
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if (!isint(av[1])) |
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return(MG_ETYPE); |
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i = atoi(av[1]); |
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if (i == 1) |
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c_cmaterial->sided = 1; |
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else if (i == 2) |
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c_cmaterial->sided = 0; |
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else |
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return(MG_EILL); |
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c_cmaterial->clock++; |
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return(MG_OK); |
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} |
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return(MG_EUNK); |
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} |
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|
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|
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int |
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c_hvertex(int ac, char **av) /* handle a vertex entity */ |
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{ |
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int i; |
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LUENT *lp; |
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|
304 |
switch (mg_entity(av[0])) { |
305 |
case MG_E_VERTEX: /* get/set vertex context */ |
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if (ac > 4) |
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return(MG_EARGC); |
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if (ac == 1) { /* set unnamed vertex context */ |
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c_unvertex = c_dfvertex; |
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c_cvertex = &c_unvertex; |
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c_cvname = NULL; |
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return(MG_OK); |
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} |
314 |
if (!isname(av[1])) |
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return(MG_EILL); |
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lp = lu_find(&vtx_tab, av[1]); /* lookup context */ |
317 |
if (lp == NULL) |
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return(MG_EMEM); |
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c_cvname = lp->key; |
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c_cvertex = (C_VERTEX *)lp->data; |
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if (ac == 2) { /* reestablish previous context */ |
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if (c_cvertex == NULL) |
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return(MG_EUNDEF); |
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return(MG_OK); |
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} |
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if (av[2][0] != '=' || av[2][1]) |
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return(MG_ETYPE); |
328 |
if (c_cvertex == NULL) { /* create new vertex context */ |
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lp->key = (char *)malloc(strlen(av[1])+1); |
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if (lp->key == NULL) |
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return(MG_EMEM); |
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strcpy(lp->key, av[1]); |
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lp->data = (char *)malloc(sizeof(C_VERTEX)); |
334 |
if (lp->data == NULL) |
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return(MG_EMEM); |
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c_cvname = lp->key; |
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c_cvertex = (C_VERTEX *)lp->data; |
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c_cvertex->clock = 0; |
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c_cvertex->client_data = NULL; |
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} |
341 |
i = c_cvertex->clock; |
342 |
if (ac == 3) { /* use default template */ |
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*c_cvertex = c_dfvertex; |
344 |
c_cvertex->clock = i + 1; |
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return(MG_OK); |
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} |
347 |
lp = lu_find(&vtx_tab, av[3]); /* lookup template */ |
348 |
if (lp == NULL) |
349 |
return(MG_EMEM); |
350 |
if (lp->data == NULL) |
351 |
return(MG_EUNDEF); |
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*c_cvertex = *(C_VERTEX *)lp->data; |
353 |
c_cvertex->clock = i + 1; |
354 |
return(MG_OK); |
355 |
case MG_E_POINT: /* set point */ |
356 |
if (ac != 4) |
357 |
return(MG_EARGC); |
358 |
if (!isflt(av[1]) | !isflt(av[2]) | !isflt(av[3])) |
359 |
return(MG_ETYPE); |
360 |
c_cvertex->p[0] = atof(av[1]); |
361 |
c_cvertex->p[1] = atof(av[2]); |
362 |
c_cvertex->p[2] = atof(av[3]); |
363 |
c_cvertex->clock++; |
364 |
return(MG_OK); |
365 |
case MG_E_NORMAL: /* set normal */ |
366 |
if (ac != 4) |
367 |
return(MG_EARGC); |
368 |
if (!isflt(av[1]) | !isflt(av[2]) | !isflt(av[3])) |
369 |
return(MG_ETYPE); |
370 |
c_cvertex->n[0] = atof(av[1]); |
371 |
c_cvertex->n[1] = atof(av[2]); |
372 |
c_cvertex->n[2] = atof(av[3]); |
373 |
(void)normalize(c_cvertex->n); |
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c_cvertex->clock++; |
375 |
return(MG_OK); |
376 |
} |
377 |
return(MG_EUNK); |
378 |
} |
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|
380 |
|
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void |
382 |
c_clearall(void) /* empty context tables */ |
383 |
{ |
384 |
c_uncolor = c_dfcolor; |
385 |
c_ccolor = &c_uncolor; |
386 |
c_ccname = NULL; |
387 |
lu_done(&clr_tab); |
388 |
c_unmaterial = c_dfmaterial; |
389 |
c_cmaterial = &c_unmaterial; |
390 |
c_cmname = NULL; |
391 |
lu_done(&mat_tab); |
392 |
c_unvertex = c_dfvertex; |
393 |
c_cvertex = &c_unvertex; |
394 |
c_cvname = NULL; |
395 |
lu_done(&vtx_tab); |
396 |
} |
397 |
|
398 |
|
399 |
C_MATERIAL * |
400 |
c_getmaterial(char *name) /* get a named material */ |
401 |
{ |
402 |
LUENT *lp; |
403 |
|
404 |
if ((lp = lu_find(&mat_tab, name)) == NULL) |
405 |
return(NULL); |
406 |
return((C_MATERIAL *)lp->data); |
407 |
} |
408 |
|
409 |
|
410 |
C_VERTEX * |
411 |
c_getvert(char *name) /* get a named vertex */ |
412 |
{ |
413 |
LUENT *lp; |
414 |
|
415 |
if ((lp = lu_find(&vtx_tab, name)) == NULL) |
416 |
return(NULL); |
417 |
return((C_VERTEX *)lp->data); |
418 |
} |
419 |
|
420 |
|
421 |
C_COLOR * |
422 |
c_getcolor(char *name) /* get a named color */ |
423 |
{ |
424 |
LUENT *lp; |
425 |
|
426 |
if ((lp = lu_find(&clr_tab, name)) == NULL) |
427 |
return(NULL); |
428 |
return((C_COLOR *)lp->data); |
429 |
} |
430 |
|
431 |
|
432 |
static int |
433 |
setspectrum( /* convert a spectrum */ |
434 |
C_COLOR *clr, |
435 |
int ac, |
436 |
char **av |
437 |
) |
438 |
{ |
439 |
double wlmin, wlmax; |
440 |
int i; |
441 |
float *va; |
442 |
/* get bounds */ |
443 |
if (ac < 4) |
444 |
return(MG_EARGC); |
445 |
if (!isflt(av[0]) || !isflt(av[1])) |
446 |
return(MG_ETYPE); |
447 |
wlmin = atof(av[0]); |
448 |
wlmax = atof(av[1]); |
449 |
ac -= 2; av += 2; |
450 |
va = (float *)malloc(sizeof(float)*ac); |
451 |
if (va == NULL) |
452 |
return(MG_EMEM); |
453 |
for (i = ac; i--; ) { |
454 |
if (!isflt(av[i])) |
455 |
return(MG_ETYPE); |
456 |
va[i] = atof(av[i]); |
457 |
} |
458 |
if (c_sset(clr, wlmin, wlmax, va, ac) <= FTINY) { |
459 |
free(va); |
460 |
return(MG_EILL); |
461 |
} |
462 |
free(va); |
463 |
clr->clock++; |
464 |
return(MG_OK); |
465 |
} |