RainbowColor

function RainbowColor(frac: double): TColor32;

This function returns a color in the rainbow spectrum based on frac (assuming it's between 0.0 & 1.0). If frac is outside that range the return color will be clRed32.

Rainbow colors progress from:

clRed32

clYellow32

clLime32

clAqua32

clBlue32

clFuchsia32

clRed32