HeatColor()

CRGB fl::HeatColor

(

uint8_t

temperature

)

Definition at line 199 of file colorutils.cpp.

                                    {
    CRGB heatcolor;
 
    // Scale 'heat' down from 0-255 to 0-191,
    // which can then be easily divided into three
    // equal 'thirds' of 64 units each.
    uint8_t t192 = scale8_video(temperature, 191);
 
    // calculate a value that ramps up from
    // zero to 255 in each 'third' of the scale.
    uint8_t heatramp = t192 & 0x3F; // 0..63
    heatramp <<= 2;                 // scale up to 0..252
 
    // now figure out which third of the spectrum we're in:
    if (t192 & 0x80) {
        // we're in the hottest third
        heatcolor.r = 255;      // full red
        heatcolor.g = 255;      // full green
        heatcolor.b = heatramp; // ramp up blue
 
    } else if (t192 & 0x40) {
        // we're in the middle third
        heatcolor.r = 255;      // full red
        heatcolor.g = heatramp; // ramp up green
        heatcolor.b = 0;        // no blue
 
    } else {
        // we're in the coolest third
        heatcolor.r = heatramp; // ramp up red
        heatcolor.g = 0;        // no green
        heatcolor.b = 0;        // no blue
    }
 
    return heatcolor;
}

References scale8_video().

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