1package aurelienribon.tweenengine.equations;
2
3import aurelienribon.tweenengine.TweenEquation;
4
5/**
6 * Easing equation based on Robert Penner's work:
7 * http://robertpenner.com/easing/
8 * @author Aurelien Ribon | http://www.aurelienribon.com/
9 */
10public abstract class Quad extends TweenEquation {
11	public static final Quad IN = new Quad() {
12		@Override
13		public final float compute(float t) {
14			return t*t;
15		}
16
17		@Override
18		public String toString() {
19			return "Quad.IN";
20		}
21	};
22
23	public static final Quad OUT = new Quad() {
24		@Override
25		public final float compute(float t) {
26			return -t*(t-2);
27		}
28
29		@Override
30		public String toString() {
31			return "Quad.OUT";
32		}
33	};
34
35	public static final Quad INOUT = new Quad() {
36		@Override
37		public final float compute(float t) {
38			if ((t*=2) < 1) return 0.5f*t*t;
39			return -0.5f * ((--t)*(t-2) - 1);
40		}
41
42		@Override
43		public String toString() {
44			return "Quad.INOUT";
45		}
46	};
47}