CurvedView.kt

override fun onSizeChanged(w: Int, h: Int, oldw: Int, oldh: Int) {
    //...
    
    mPath.apply {
    //1.Step
    moveTo(
        mCurveStartPoint.x.toFloat(),
        mCurveStartPoint.y.toFloat()
    )
    //2.Step
    cubicTo(
        mControlPoint1.x.toFloat(), mControlPoint1.y.toFloat(),
        mControlPoint2.x.toFloat(), mControlPoint2.y.toFloat(),
        mCurveEndPoint.x.toFloat(), mCurveEndPoint.y.toFloat()
    )
    //3.Step 
    lineTo(mWidth.toFloat(), mHeight.toFloat())
    //4.Step
    lineTo(0f, mHeight.toFloat())
    
}
}