Function of view class

onSizeChanged.kt

override fun onSizeChanged(w: Int, h: Int, oldw: Int, oldh: Int) {
        super.onSizeChanged(w, h, oldw, oldh)
        /* curve from P1 to P2 */
        leftArc.set(
            0f,
            0f,
            xAxisOffset,
            yAxisOffset
        )
        path.addArc(leftArc, 180f, 90f)
        /* line from P2 to P3 */
        path.lineTo(w.toFloat() - (xAxisOffset * 0.5f), 0f)
        /* curve from P3 to P4 */
        rightArc.set(
            w.toFloat() - (xAxisOffset),
            0f,
            w.toFloat(),
            yAxisOffset
        )
        path.addArc(rightArc, 270f, 90f)
        /* line from P4 to P5 */
        path.lineTo(w.toFloat(), h.toFloat())
        /* line from P5 to P6 */
        path.lineTo(0f, h.toFloat())
        /* line from P6 to P1 */
        path.lineTo(0f, yAxisOffset - (yAxisOffset / 2))
        path.close()
    }