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package aurelienribon.tweenengine.equations;
import aurelienribon.tweenengine.TweenEquation;
/**
* Easing equation based on Robert Penner's work:
* http://robertpenner.com/easing/
* @author Aurelien Ribon | http://www.aurelienribon.com/
*/
public abstract class Elastic extends TweenEquation {
private static final float PI = 3.14159265f;
public static final Elastic IN = new Elastic() {
@Override
public final float compute(float t) {
float a = param_a;
float p = param_p;
if (t==0) return 0; if (t==1) return 1; if (!setP) p=.3f;
float s;
if (!setA || a < 1) { a=1; s=p/4; }
else s = p/(2*PI) * (float)Math.asin(1/a);
return -(a*(float)Math.pow(2,10*(t-=1)) * (float)Math.sin( (t-s)*(2*PI)/p ));
}
@Override
public String toString() {
return "Elastic.IN";
}
};
public static final Elastic OUT = new Elastic() {
@Override
public final float compute(float t) {
float a = param_a;
float p = param_p;
if (t==0) return 0; if (t==1) return 1; if (!setP) p=.3f;
float s;
if (!setA || a < 1) { a=1; s=p/4; }
else s = p/(2*PI) * (float)Math.asin(1/a);
return a*(float)Math.pow(2,-10*t) * (float)Math.sin( (t-s)*(2*PI)/p ) + 1;
}
@Override
public String toString() {
return "Elastic.OUT";
}
};
public static final Elastic INOUT = new Elastic() {
@Override
public final float compute(float t) {
float a = param_a;
float p = param_p;
if (t==0) return 0; if ((t*=2)==2) return 1; if (!setP) p=.3f*1.5f;
float s;
if (!setA || a < 1) { a=1; s=p/4; }
else s = p/(2*PI) * (float)Math.asin(1/a);
if (t < 1) return -.5f*(a*(float)Math.pow(2,10*(t-=1)) * (float)Math.sin( (t-s)*(2*PI)/p ));
return a*(float)Math.pow(2,-10*(t-=1)) * (float)Math.sin( (t-s)*(2*PI)/p )*.5f + 1;
}
@Override
public String toString() {
return "Elastic.INOUT";
}
};
// -------------------------------------------------------------------------
protected float param_a;
protected float param_p;
protected boolean setA = false;
protected boolean setP = false;
public Elastic a(float a) {
param_a = a;
this.setA = true;
return this;
}
public Elastic p(float p) {
param_p = p;
this.setP = true;
return this;
}
}
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