circleView.kt

override fun onTouchEvent(event: MotionEvent?): Boolean {
        when (event?.action) {
            MotionEvent.ACTION_UP -> {
                val touchPoint = PointF(event.x, event.y)
              
              //Distance between two points
                val distance = sqrt(
                        (centre.x - touchPoint.x).pow(2)
                        + (centre.y - touchPoint.y).pow(2)
                )
              
                if (dis <= Constants.circleRadius) {
                    callOnClick()
                }
            }
        }
        return true
    }