phaser/v3/src/math/SinCosTableGenerator.js

var SinCosTableGenerator = function (length, sinAmp, cosAmp, frequency)
{
    if (sinAmp === undefined) { sinAmp = 1; }
    if (cosAmp === undefined) { cosAmp = 1; }
    if (frequency === undefined) { frequency = 1; }

    frequency *= Math.PI / length;

    var cos = [];
    var sin = [];

    for (var c = 0; c < length; c++)
    {
        cosAmp -= sinAmp * frequency;
        sinAmp += cosAmp * frequency;

        cos[c] = cosAmp;
        sin[c] = sinAmp;
    }

    return {
        sin: sin,
        cos: cos,
        length: length
    };
};

module.exports = SinCosTableGenerator;