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HSV to RGB (Arduino)
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void HSV_to_RGB(float h, float s, float v, byte *r, byte *g, byte *b) | |
{ | |
int i,f,p,q,t; | |
h = max(0.0, min(360.0, h)); | |
s = max(0.0, min(100.0, s)); | |
v = max(0.0, min(100.0, v)); | |
s /= 100; | |
v /= 100; | |
if(s == 0) { | |
// Achromatic (grey) | |
*r = *g = *b = round(v*255); | |
return; | |
} | |
h /= 60; // sector 0 to 5 | |
i = floor(h); | |
f = h - i; // factorial part of h | |
p = v * (1 - s); | |
q = v * (1 - s * f); | |
t = v * (1 - s * (1 - f)); | |
switch(i) { | |
case 0: | |
*r = round(255*v); | |
*g = round(255*t); | |
*b = round(255*p); | |
break; | |
case 1: | |
*r = round(255*q); | |
*g = round(255*v); | |
*b = round(255*p); | |
break; | |
case 2: | |
*r = round(255*p); | |
*g = round(255*v); | |
*b = round(255*t); | |
break; | |
case 3: | |
*r = round(255*p); | |
*g = round(255*q); | |
*b = round(255*v); | |
break; | |
case 4: | |
*r = round(255*t); | |
*g = round(255*p); | |
*b = round(255*v); | |
break; | |
default: // case 5: | |
*r = round(255*v); | |
*g = round(255*p); | |
*b = round(255*q); | |
} | |
} |
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