From fc40e7f6e3165a002326c92401c17951b7048a32 Mon Sep 17 00:00:00 2001
From: Jesse Morgan <jesse@jesterpm.net>
Date: Fri, 28 Jan 2011 18:52:51 +0000
Subject: And we now have a basic 3d world :D

---
 src/tesseract/forces/Force.java   | 29 +++++++++++++++++++++++
 src/tesseract/forces/Gravity.java | 49 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 78 insertions(+)
 create mode 100644 src/tesseract/forces/Force.java
 create mode 100644 src/tesseract/forces/Gravity.java

(limited to 'src/tesseract/forces')

diff --git a/src/tesseract/forces/Force.java b/src/tesseract/forces/Force.java
new file mode 100644
index 0000000..60498a1
--- /dev/null
+++ b/src/tesseract/forces/Force.java
@@ -0,0 +1,29 @@
+package tesseract.forces;
+
+import javax.vecmath.Vector3f;
+
+import tesseract.objects.Forceable;
+
+/**
+ * Abstract Force class.
+ * 
+ * @author Jesse Morgan
+ */
+public abstract class Force {
+
+	/**
+	 * Calculate the force to apply to the give object.
+	 * @param obj The given object.
+	 * @return A vector describing the force.
+	 */
+	protected abstract Vector3f calculateForce(final Forceable obj);
+	
+	/**
+	 * Apply this force to the given object.
+	 * 
+	 * @param obj The given object.
+	 */
+	public void applyForceTo(final Forceable obj) {
+		obj.addForce(calculateForce(obj));
+	}
+}
diff --git a/src/tesseract/forces/Gravity.java b/src/tesseract/forces/Gravity.java
new file mode 100644
index 0000000..79e7f6a
--- /dev/null
+++ b/src/tesseract/forces/Gravity.java
@@ -0,0 +1,49 @@
+package tesseract.forces;
+
+import javax.vecmath.Vector3f;
+
+import tesseract.objects.Forceable;
+
+/**
+ * Generic downward force class (aka Gravity).
+ * 
+ * @author Jesse Morgan
+ */
+public class Gravity extends Force {
+	/**
+	 * Default gravity force.
+	 */
+	private static final float DEFAULT_GRAVITY = 1f;
+	
+	/**
+	 * The force used here.
+	 */
+	private float myGravity;
+	
+	/**
+	 * Create a default gravity.
+	 */
+	public Gravity() {
+		myGravity = DEFAULT_GRAVITY;
+	}
+	
+	/**
+	 * Create gravity with a custom strength.
+	 * 
+	 * @param gravity The strength of gravity.
+	 */
+	public Gravity(final float gravity) {
+		myGravity = gravity;
+	}
+	
+	/**
+	 * Calculate the force of gravity...
+	 * 
+	 * @param obj The object the force is calculated for.
+	 * @return A vector describing the force
+	 */
+	protected Vector3f calculateForce(final Forceable obj) {
+		return new Vector3f(0, -myGravity, 0);
+	}
+
+}
-- 
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