1 files changed, 55 insertions, 0 deletions
diff --git a/java/api/src/aurelienribon/tweenengine/equations/Bounce.java b/java/api/src/aurelienribon/tweenengine/equations/Bounce.java
new file mode 100755
index 0000000..3cfc4e3
--- /dev/null
+++ b/java/api/src/aurelienribon/tweenengine/equations/Bounce.java
@@ -0,0 +1,55 @@
+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 Bounce extends TweenEquation {
+	public static final Bounce IN = new Bounce() {
+		@Override
+		public final float compute(float t) {
+			return 1 - OUT.compute(1-t);
+		}
+
+		@Override
+		public String toString() {
+			return "Bounce.IN";
+		}
+	};
+
+	public static final Bounce OUT = new Bounce() {
+		@Override
+		public final float compute(float t) {
+			if (t < (1/2.75)) {
+				return 7.5625f*t*t;
+			} else if (t < (2/2.75)) {
+				return 7.5625f*(t-=(1.5f/2.75f))*t + .75f;
+			} else if (t < (2.5/2.75)) {
+				return 7.5625f*(t-=(2.25f/2.75f))*t + .9375f;
+			} else {
+				return 7.5625f*(t-=(2.625f/2.75f))*t + .984375f;
+			}
+		}
+
+		@Override
+		public String toString() {
+			return "Bounce.OUT";
+		}
+	};
+
+	public static final Bounce INOUT = new Bounce() {
+		@Override
+		public final float compute(float t) {
+			if (t < 0.5f) return IN.compute(t*2) * .5f;
+			else return OUT.compute(t*2-1) * .5f + 0.5f;
+		}
+
+		@Override
+		public String toString() {
+			return "Bounce.INOUT";
+		}
+	};
+}
+\ No newline at end of file