onSizeChanged with linear gradient set up

foo.kt

override fun onSizeChanged(w: Int, h: Int, oldw: Int, oldh: Int) {
    super.onSizeChanged(w, h, oldw, oldh)

    val colors = intArrayOf(
        typedArray.getColor(R.styleable.SlickGraph_gradColorStart, defaultColor),
        typedArray.getColor(R.styleable.SlickGraph_gradColorEnd, defaultColor)
    )

    val gradient = LinearGradient(
        0f,
        0f,
        0f,
        h.toFloat(),
        colors,
        null,
        Shader.TileMode.CLAMP
    )

    gradientPaint = Paint()
    gradientPaint.style = Paint.Style.FILL
    gradientPaint.shader = gradient
}

i got this. Thanks.