StarInterpolator.java

package com.list.view.amyu.twitterfavorite;

import android.content.Context;
import android.util.AttributeSet;
import android.view.animation.Interpolator;

/**
 * Created by amyu on 15/04/28.
 */
public class StarInterpolator implements Interpolator {

    public StarInterpolator() {
    }

    @SuppressWarnings({"UnusedDeclaration"})
    public StarInterpolator(Context context, AttributeSet attrs) {
    }

    private static float bounce(float t) {
        return t * t * 8.0f;
    }

    @Override
    public float getInterpolation(final float v) {
        float x = v * 1.1226f;
        if (x < 0.7408f) {
            return (float) (0.65 * Math.sin(6.28 * v - Math.PI / 2) + 0.65);
        } else if (x < 0.9644f) {
            return bounce(x - 0.8526f) + 0.9f;
        } else {
            return bounce(x - 1.0435f) + 0.95f;
        }
    }
}