package aurelienribon.tweenengine.equations;
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import aurelienribon.tweenengine.TweenEquation;
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/**
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* Easing equation based on Robert Penner's work:
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* http://robertpenner.com/easing/
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* @author Aurelien Ribon | http://www.aurelienribon.com/
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*/
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public abstract class Back extends TweenEquation {
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public static final Back IN = new Back() {
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@Override
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public final float compute(float t) {
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float s = param_s;
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return t*t*((s+1)*t - s);
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}
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@Override
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public String toString() {
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return "Back.IN";
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}
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};
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public static final Back OUT = new Back() {
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@Override
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public final float compute(float t) {
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float s = param_s;
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return (t-=1)*t*((s+1)*t + s) + 1;
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}
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@Override
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public String toString() {
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return "Back.OUT";
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}
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};
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public static final Back INOUT = new Back() {
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@Override
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public final float compute(float t) {
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float s = param_s;
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if ((t*=2) < 1) return 0.5f*(t*t*(((s*=(1.525f))+1)*t - s));
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return 0.5f*((t-=2)*t*(((s*=(1.525f))+1)*t + s) + 2);
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}
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@Override
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public String toString() {
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return "Back.INOUT";
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}
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};
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// -------------------------------------------------------------------------
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protected float param_s = 1.70158f;
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public Back s(float s) {
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param_s = s;
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return this;
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}
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}
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