CurvedView.kt

override fun onSizeChanged(w: Int, h: Int, oldw: Int, oldh: Int) {
    super.onSizeChanged(w, h, oldw, oldh)
    mCurveStartPoint.set(0, radius)
    mCurveEndPoint.set(w, radius)

    mControlPoint1.set(
         mCurveStartPoint.x + radius,
         mCurveStartPoint.y - radius)
    
    mControlPoint2.set(
         mCurveEndPoint.x - radius, 
         mCurveEndPoint.y - radius)
}