1 files changed, 49 insertions, 0 deletions
diff --git a/src/tesseract/forces/Gravity.java b/src/tesseract/forces/Gravity.java
new file mode 100644
index 0000000..79e7f6a
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+++ b/src/tesseract/forces/Gravity.java
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+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);
+	}
+
+}