| 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"; |
| } |
| }; |
| } |