Updating amplitude

DynamicView.kt

class DynamicView
@JvmOverloads constructor(
    context: Context,
    attrs: AttributeSet? = null,
    defStyleAttr: Int = 0
) : View(context, attrs, defStyleAttr) {
    
    private var animateToAmplitude = 0f
    private var amplitude = 0f
    private var deltaAmplitude = 0f

    var speed = Speed.HIGH

    init {
        setWillNotDraw(false)
    }
    
    override fun onDraw(canvas: Canvas) {
        super.onDraw(canvas)
        
        // draw something depending on current amplitude value
        invalidate()
    }

    fun setAmplitude(value: Float) {
        animateToAmplitude = value
        val diff = animateToAmplitude - amplitude // current amplitude stored in view
        if (animateToAmplitude > amplitude) {
            deltaAmplitude = diff / (100f + 600f * speed.coef)
        } else {
            deltaAmplitude = diff / (100f + 1000f * speed.coef)
        }
    }

    enum class Speed(val coef: Float) {
        HIGH(0.35f),
        SLOW(0.50f)
    }
}