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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 Expo extends TweenEquation {
public static final Expo IN = new Expo() {
@Override
public final float compute(float t) {
return (t==0) ? 0 : (float) Math.pow(2, 10 * (t - 1));
}
@Override
public String toString() {
return "Expo.IN";
}
};
public static final Expo OUT = new Expo() {
@Override
public final float compute(float t) {
return (t==1) ? 1 : -(float) Math.pow(2, -10 * t) + 1;
}
@Override
public String toString() {
return "Expo.OUT";
}
};
public static final Expo INOUT = new Expo() {
@Override
public final float compute(float t) {
if (t==0) return 0;
if (t==1) return 1;
if ((t*=2) < 1) return 0.5f * (float) Math.pow(2, 10 * (t - 1));
return 0.5f * (-(float)Math.pow(2, -10 * --t) + 2);
}
@Override
public String toString() {
return "Expo.INOUT";
}
};
}
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