fill_rainbow_circular() [1/3]

void fl::fill_rainbow_circular	(	CHSV *	targetArray,
		int	numToFill,
		fl::u8	initialhue,
		bool	reversed = false )

Fill a range of LEDs with a rainbow of colors, so that the hues are continuous between the end of the strip and the beginning.

The colors making up the rainbow are at full saturation and full value (brightness).

Parameters

targetArray	a pointer to the LED array to fill
numToFill	the number of LEDs to fill in the array
initialhue	the starting hue for the rainbow
reversed	whether to progress through the rainbow hues backwards

Definition at line 81 of file fill.cpp.hpp.

                                                                      {
    if (numToFill == 0)
        return; // avoiding div/0
 
    CHSV hsv;
    hsv.hue = initialhue;
    hsv.val = 255;
    hsv.sat = 240;
 
    const u16 hueChange =
        65535 / (u16)numToFill; // hue change for each LED, * 256 for
                                     // precision (256 * 256 - 1)
    u16 hueOffset = 0; // offset for hue value, with precision (*256)
 
    for (int i = 0; i < numToFill; ++i) {
        targetArray[i] = hsv;
        if (reversed)
            hueOffset -= hueChange;
        else
            hueOffset += hueChange;
        hsv.hue = initialhue +
                  (u8)(hueOffset >>
                            8); // assign new hue with precise offset (as 8-bit)
    }
}

References FL_NO_EXCEPT.