114 lines
2.3 KiB
C
114 lines
2.3 KiB
C
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#ifndef _COLOR_UTIL
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#define _COLOR_UTIL
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#include "math_util.h"
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static int ColorTableShot[8][3]=
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{
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// {255,255,255},
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{255,0,122},
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{255,255,0},
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{255,0,255},
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{0,255,255},
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{0,0,255},
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{255,122,0},
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// {255,0,0},
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{0,255,0},
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{139,0,139}
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};
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static int ColorTableCircle[16][3]=
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{
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{255,255,255},
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{255,122,255},
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{255,255,0},
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{255,122,0},
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{255,0,255},
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{255,0,122},
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{0,255,255},
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{0,255,122},
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{0,0,255},
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{0,0,122},
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{255,0,0},
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{122,0,0},
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{0,122,0},
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{0,255,0},
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{139,0,139},
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{139,122,139}
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};
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#define JET_COLORS_LUT_SIZE 1024
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static float jet_colors[JET_COLORS_LUT_SIZE][3];
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static int jet_colors_initialized = 0;
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static inline void color_util_rand_color(float f[4],
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double alpha,
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double min_intensity)
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{
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f[3] = alpha;
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again:
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f[0] = randf();
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f[1] = randf();
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f[2] = randf();
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float v = f[0] + f[1] + f[2];
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// reject colors that are too dark
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if (v < min_intensity)
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goto again;
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}
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/** Given an array of colors, a palette is created that linearly interpolates through all the colors. **/
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static void color_util_build_color_table(double color_palette[][3],
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int palette_size,
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float lut[][3],
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int lut_size)
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{
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for (int idx = 0; idx < lut_size; idx++)
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{
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double znorm = ((double) idx) / lut_size;
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int color_index = (palette_size - 1) * znorm;
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double alpha = (palette_size - 1) * znorm - color_index;
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for (int i = 0; i < 3; i++)
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{
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lut[idx][i] = color_palette[color_index][i] * (1.0 - alpha) + color_palette[color_index+1][i]*alpha;
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}
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}
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}
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static void init_color_table_jet()
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{
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double jet[][3] = {{ 0, 0, 1 },
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{ 0, .5, .5 },
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{ .8, .8, 0 },
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{ 1, 0, 0 }};
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color_util_build_color_table(
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jet,
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sizeof(jet)/(sizeof(double)*3),
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jet_colors,
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JET_COLORS_LUT_SIZE);
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jet_colors_initialized = 1;
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}
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static inline float *color_util_jet(double v)
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{
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if (!jet_colors_initialized)
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init_color_table_jet();
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v = fmax(0, v);
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v = fmin(1, v);
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int idx = (JET_COLORS_LUT_SIZE - 1) * v;
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return jet_colors[idx];
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}
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#endif
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