color_byr.c

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00001 #include "gis.h"
00002 
00003 static int add_byr_colors (struct Colors *, DCELL, DCELL);
00004 
00005 int 
00006 G_make_byr_colors (struct Colors *colors, CELL min, CELL max)
00007 {
00008     G_init_colors (colors);
00009     return add_byr_colors (colors, (DCELL) min, (DCELL) max);
00010 }
00011 
00012 int 
00013 G_make_byr_fp_colors (struct Colors *colors, DCELL min, DCELL max)
00014 {
00015     G_init_colors (colors);
00016     return add_byr_colors (colors, min, max);
00017 }
00018 
00019 int 
00020 G_add_byr_colors (struct Colors *colors, CELL min, CELL max)
00021 {
00022     return add_byr_colors (colors, (DCELL) min, (DCELL) max);
00023 }
00024 
00025 static int add_byr_colors (struct Colors *colors, DCELL min, DCELL max)
00026 {
00027     DCELL half;
00028 
00029     if (max < min) return -1;
00030     if (min == 1.) min = 0.;
00031     if (max == -1.) max = 0.;
00032 
00033     half = (min+max)/2.;
00034 
00035     G_add_d_raster_color_rule (&min, 0, 0, 255, &half, 255, 255, 0, colors);
00036     G_add_d_raster_color_rule (&half, 255, 255, 0, &max, 255, 0, 0, colors);
00037 
00038     return 1;
00039 }

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