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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 Sine extends TweenEquation {
private static final float PI = 3.14159265f;
public static final Sine IN = new Sine() {
@Override
public final float compute(float t) {
return (float) -Math.cos(t * (PI/2)) + 1;
}
@Override
public String toString() {
return "Sine.IN";
}
};
public static final Sine OUT = new Sine() {
@Override
public final float compute(float t) {
return (float) Math.sin(t * (PI/2));
}
@Override
public String toString() {
return "Sine.OUT";
}
};
public static final Sine INOUT = new Sine() {
@Override
public final float compute(float t) {
return -0.5f * ((float) Math.cos(PI*t) - 1);
}
@Override
public String toString() {
return "Sine.INOUT";
}
};
}
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