HeatColor()

CRGB fl::HeatColor

(

fl::u8

temperature

)

Definition at line 200 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.
    fl::u8 t192 = scale8_video(temperature, 191);
 
    // calculate a value that ramps up from
    // zero to 255 in each 'third' of the scale.
    fl::u8 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().

Here is the call graph for this function: