override fun onDraw(canvas: Canvas) {
        super.onDraw(canvas)

        //draw circles separated by a space the size of waveGap
        var currentRadius = initialRadius + waveRadiusOffset
        while (currentRadius < maxRadius) {
            val path = createStarPath(currentRadius, wavePath)

            val offset = currentRadius / maxRadius
            val rounding = lerp(currentRadius / 2f, currentRadius * 4f, offset)
            wavePaint.pathEffect = CornerPathEffect(rounding)

            canvas.drawPath(path, wavePaint)
            currentRadius += waveGap
        }

        canvas.drawPaint(gradientPaint)
    }

    // linear interpolation
    private fun lerp(a: Float, b: Float, t: Float): Float {
        return a + (b - a) * t
    }