i've come across this ActionScript sample, which demonstrates drawing of the color spectrum, one line at a time via a loop, using waveforms.

however, the waveform location of each RGB channel create a color spectrum that is missing colors (pure yellow, cyan and magenta) and therefore the spectrum is incomplete.

how can i remedy this problem so that the drawn color spectrum will exhibit all colors?

// Loop through all of the pixels from '0' to the specified width.
for(var i:int = 0; i < nWidth; i++)
    {
    // Calculate the color percentage based on the current pixel.
    nColorPercent = i / nWidth;

    // Calculate the radians of the angle to use for rotating color values.
    nRadians = (-360 * nColorPercent) * (Math.PI / 180);

    // Calculate the RGB channels based on the angle.
    nR = Math.cos(nRadians)                   * 127 + 128 << 16;
    nG = Math.cos(nRadians + 2 * Math.PI / 3) * 127 + 128 << 8;
    nB = Math.cos(nRadians + 4 * Math.PI / 3) * 127 + 128;

    // OR the individual color channels together.
    nColor  = nR | nG | nB;
    }