| 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 Quart extends TweenEquation { |
| public static final Quart IN = new Quart() { |
| @Override |
| public final float compute(float t) { |
| return t*t*t*t; |
| } |
| |
| @Override |
| public String toString() { |
| return "Quart.IN"; |
| } |
| }; |
| |
| public static final Quart OUT = new Quart() { |
| @Override |
| public final float compute(float t) { |
| return -((t-=1)*t*t*t - 1); |
| } |
| |
| @Override |
| public String toString() { |
| return "Quart.OUT"; |
| } |
| }; |
| |
| public static final Quart INOUT = new Quart() { |
| @Override |
| public final float compute(float t) { |
| if ((t*=2) < 1) return 0.5f*t*t*t*t; |
| return -0.5f * ((t-=2)*t*t*t - 2); |
| } |
| |
| @Override |
| public String toString() { |
| return "Quart.INOUT"; |
| } |
| }; |
| } |