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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 Back extends TweenEquation {
public static final Back IN = new Back() {
@Override
public final float compute(float t) {
float s = param_s;
return t*t*((s+1)*t - s);
}
@Override
public String toString() {
return "Back.IN";
}
};
public static final Back OUT = new Back() {
@Override
public final float compute(float t) {
float s = param_s;
return (t-=1)*t*((s+1)*t + s) + 1;
}
@Override
public String toString() {
return "Back.OUT";
}
};
public static final Back INOUT = new Back() {
@Override
public final float compute(float t) {
float s = param_s;
if ((t*=2) < 1) return 0.5f*(t*t*(((s*=(1.525f))+1)*t - s));
return 0.5f*((t-=2)*t*(((s*=(1.525f))+1)*t + s) + 2);
}
@Override
public String toString() {
return "Back.INOUT";
}
};
// -------------------------------------------------------------------------
protected float param_s = 1.70158f;
public Back s(float s) {
param_s = s;
return this;
}
}
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