Antonio De Lima Fernandes / Multi_WS2811

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Dependents:   GUILED_8x8_Demo

Fork of Multi_WS2811 by Ned Konz

Colors.cpp@2:8adaf48544cc, 2014-11-15 (annotated)

Committer:
antoniorohit
Date:
Sat Nov 15 01:23:27 2014 +0000
Revision:
2:8adaf48544cc
Parent:
0:a8535703f23b 
Changed port to C (PTC)

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bikeNomad 0:a8535703f23b 1 #include <math.h>
bikeNomad 0:a8535703f23b 2 #include <mbed.h>
bikeNomad 0:a8535703f23b 3 #include "Colors.h"
bikeNomad 0:a8535703f23b 4
bikeNomad 0:a8535703f23b 5 void HSBtoRGB(float hue, float saturation, float brightness, uint8_t *pr, uint8_t *pg, uint8_t *pb)
bikeNomad 0:a8535703f23b 6 {
bikeNomad 0:a8535703f23b 7 uint8_t r = 0, g = 0, b = 0;
bikeNomad 0:a8535703f23b 8 if (saturation == 0) {
bikeNomad 0:a8535703f23b 9 r = g = b = (uint8_t) (brightness * 255.0f + 0.5f);
bikeNomad 0:a8535703f23b 10 } else {
bikeNomad 0:a8535703f23b 11 float h = (hue - (float)floor(hue)) * 6.0f;
bikeNomad 0:a8535703f23b 12 float f = h - (float)floor(h);
bikeNomad 0:a8535703f23b 13 float p = brightness * (1.0f - saturation);
bikeNomad 0:a8535703f23b 14 float q = brightness * (1.0f - saturation * f);
bikeNomad 0:a8535703f23b 15 float t = brightness * (1.0f - (saturation * (1.0f - f)));
bikeNomad 0:a8535703f23b 16 switch ((int) h) {
bikeNomad 0:a8535703f23b 17 case 0:
bikeNomad 0:a8535703f23b 18 r = (int) (brightness * 255.0f + 0.5f);
bikeNomad 0:a8535703f23b 19 g = (int) (t * 255.0f + 0.5f);
bikeNomad 0:a8535703f23b 20 b = (int) (p * 255.0f + 0.5f);
bikeNomad 0:a8535703f23b 21 break;
bikeNomad 0:a8535703f23b 22 case 1:
bikeNomad 0:a8535703f23b 23 r = (int) (q * 255.0f + 0.5f);
bikeNomad 0:a8535703f23b 24 g = (int) (brightness * 255.0f + 0.5f);
bikeNomad 0:a8535703f23b 25 b = (int) (p * 255.0f + 0.5f);
bikeNomad 0:a8535703f23b 26 break;
bikeNomad 0:a8535703f23b 27 case 2:
bikeNomad 0:a8535703f23b 28 r = (int) (p * 255.0f + 0.5f);
bikeNomad 0:a8535703f23b 29 g = (int) (brightness * 255.0f + 0.5f);
bikeNomad 0:a8535703f23b 30 b = (int) (t * 255.0f + 0.5f);
bikeNomad 0:a8535703f23b 31 break;
bikeNomad 0:a8535703f23b 32 case 3:
bikeNomad 0:a8535703f23b 33 r = (int) (p * 255.0f + 0.5f);
bikeNomad 0:a8535703f23b 34 g = (int) (q * 255.0f + 0.5f);
bikeNomad 0:a8535703f23b 35 b = (int) (brightness * 255.0f + 0.5f);
bikeNomad 0:a8535703f23b 36 break;
bikeNomad 0:a8535703f23b 37 case 4:
bikeNomad 0:a8535703f23b 38 r = (int) (t * 255.0f + 0.5f);
bikeNomad 0:a8535703f23b 39 g = (int) (p * 255.0f + 0.5f);
bikeNomad 0:a8535703f23b 40 b = (int) (brightness * 255.0f + 0.5f);
bikeNomad 0:a8535703f23b 41 break;
bikeNomad 0:a8535703f23b 42 case 5:
bikeNomad 0:a8535703f23b 43 r = (int) (brightness * 255.0f + 0.5f);
bikeNomad 0:a8535703f23b 44 g = (int) (p * 255.0f + 0.5f);
bikeNomad 0:a8535703f23b 45 b = (int) (q * 255.0f + 0.5f);
bikeNomad 0:a8535703f23b 46 break;
bikeNomad 0:a8535703f23b 47 }
bikeNomad 0:a8535703f23b 48 }
bikeNomad 0:a8535703f23b 49 *pr = r;
bikeNomad 0:a8535703f23b 50 *pg = g;
bikeNomad 0:a8535703f23b 51 *pb = b;
bikeNomad 0:a8535703f23b 52 }
bikeNomad 0:a8535703f23b 53
bikeNomad 0:a8535703f23b 54 float* RGBtoHSB(uint8_t r, uint8_t g, uint8_t b, float* hsbvals)
bikeNomad 0:a8535703f23b 55 {
bikeNomad 0:a8535703f23b 56 float hue, saturation, brightness;
bikeNomad 0:a8535703f23b 57 if (!hsbvals) {
bikeNomad 0:a8535703f23b 58 hsbvals = new float[3];
bikeNomad 0:a8535703f23b 59 }
bikeNomad 0:a8535703f23b 60 uint8_t cmax = (r > g) ? r : g;
bikeNomad 0:a8535703f23b 61 if (b > cmax) cmax = b;
bikeNomad 0:a8535703f23b 62 uint8_t cmin = (r < g) ? r : g;
bikeNomad 0:a8535703f23b 63 if (b < cmin) cmin = b;
bikeNomad 0:a8535703f23b 64
bikeNomad 0:a8535703f23b 65 brightness = ((float) cmax) / 255.0f;
bikeNomad 0:a8535703f23b 66 if (cmax != 0)
bikeNomad 0:a8535703f23b 67 saturation = ((float) (cmax - cmin)) / ((float) cmax);
bikeNomad 0:a8535703f23b 68 else
bikeNomad 0:a8535703f23b 69 saturation = 0;
bikeNomad 0:a8535703f23b 70 if (saturation == 0)
bikeNomad 0:a8535703f23b 71 hue = 0;
bikeNomad 0:a8535703f23b 72 else {
bikeNomad 0:a8535703f23b 73 float redc = ((float) (cmax - r)) / ((float) (cmax - cmin));
bikeNomad 0:a8535703f23b 74 float greenc = ((float) (cmax - g)) / ((float) (cmax - cmin));
bikeNomad 0:a8535703f23b 75 float bluec = ((float) (cmax - b)) / ((float) (cmax - cmin));
bikeNomad 0:a8535703f23b 76 if (r == cmax)
bikeNomad 0:a8535703f23b 77 hue = bluec - greenc;
bikeNomad 0:a8535703f23b 78 else if (g == cmax)
bikeNomad 0:a8535703f23b 79 hue = 2.0f + redc - bluec;
bikeNomad 0:a8535703f23b 80 else
bikeNomad 0:a8535703f23b 81 hue = 4.0f + greenc - redc;
bikeNomad 0:a8535703f23b 82 hue = hue / 6.0f;
bikeNomad 0:a8535703f23b 83 if (hue < 0)
bikeNomad 0:a8535703f23b 84 hue = hue + 1.0f;
bikeNomad 0:a8535703f23b 85 }
bikeNomad 0:a8535703f23b 86 hsbvals[0] = hue;
bikeNomad 0:a8535703f23b 87 hsbvals[1] = saturation;
bikeNomad 0:a8535703f23b 88 hsbvals[2] = brightness;
bikeNomad 0:a8535703f23b 89 return hsbvals;
bikeNomad 0:a8535703f23b 90 }