Back.java

package com.external.easing;

public class Back {
	
	public static float  easeIn(float t,float b , float c, float d) {
		float s = 1.70158f;
		return c*(t/=d)*t*((s+1)*t - s) + b;
	}
	
	public static float  easeIn(float t,float b , float c, float d, float s) {
		return c*(t/=d)*t*((s+1)*t - s) + b;
	}
	
	public static float  easeOut(float t,float b , float c, float d) {
		float s = 1.70158f;
		return c*((t=t/d-1)*t*((s+1)*t + s) + 1) + b;
	}
	
	public static float  easeOut(float t,float b , float c, float d, float s) {
		return c*((t=t/d-1)*t*((s+1)*t + s) + 1) + b;
	}
	
	public static float  easeInOut(float t,float b , float c, float d) {
		float s = 1.70158f;
		if ((t/=d/2) < 1) return c/2*(t*t*(((s*=(1.525f))+1)*t - s)) + b;
		return c/2*((t-=2)*t*(((s*=(1.525f))+1)*t + s) + 2) + b;
	}
	
	public static float  easeInOut(float t,float b , float c, float d, float s) {	
		if ((t/=d/2) < 1) return c/2*(t*t*(((s*=(1.525f))+1)*t - s)) + b;
		return c/2*((t-=2)*t*(((s*=(1.525f))+1)*t + s) + 2) + b;
	}
	
}