Quart.java

package com.external.easing;

public class Quart {
	
	public static float  easeIn(float t,float b , float c, float d) {
		return c*(t/=d)*t*t*t + b;
	}
	
	public static float  easeOut(float t,float b , float c, float d) {
		return -c * ((t=t/d-1)*t*t*t - 1) + b;
	}
	
	public static float  easeInOut(float t,float b , float c, float d) {
		if ((t/=d/2) < 1) return c/2*t*t*t*t + b;
		return -c/2 * ((t-=2)*t*t*t - 2) + b;
	}
	
}