EaseCircularInOutInterpolator.java

package com.xdroid.animation.interpolate;

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

/**
 * Created by cimi on 15/7/2.
 */

public class EaseCircularInOutInterpolator implements Interpolator {
	
    public EaseCircularInOutInterpolator() {}
	
    public EaseCircularInOutInterpolator(Context context, AttributeSet attrs) {}

	public float getInterpolation(float input) {
		if((input /= 0.5) < 1) {
			return (float) (-1 * 0.5 * (Math.sqrt(1 - input * input) - 1));
		}

		return (float) (0.5 * (Math.sqrt(1 - (input -= 2) * input) + 1));
	}
}