BlindlyTeam/Blindly

package ch.epfl.sdp.blindly.animations

import android.view.animation.Interpolator
import kotlin.math.cos
import kotlin.math.pow

/**
 * Interpolator for the bounce animation of buttons
 *
 * @constructor
 * Sets the amplitude and frequency.
 *
 * @param amplitude
 * @param frequency
 */
internal class BounceInterpolator(amplitude: Double, frequency: Double) : Interpolator {
    private var mAmplitude = 1.0
    private var mFrequency = 10.0

    override fun getInterpolation(time: Float): Float {
        return (-1 * Math.E.pow(-time / mAmplitude) *
                cos(mFrequency * time) + 1).toFloat()
    }

    init {
        mAmplitude = amplitude
        mFrequency = frequency
    }
}