,                 (GraphicalCurve.oneMinusTPow3[index] * this.bezierStartPt.y
            + GraphicalCurve.bezierFactorOne[index] * this.bezierStartControlPt.y
            + GraphicalCurve.bezierFactorTwo[index] * this.bezierEndControlPt.y + GraphicalCurve.tPow3[index] * this.bezierEndPt.y));