Added a shiny new particle emitter.

2 files changed, 75 insertions, 1 deletions

diff --git a/src/tesseract/TesseractUI.java b/src/tesseract/TesseractUI.java
index 61a7e13..74d0af3 100644
--- a/src/tesseract/TesseractUI.java
+++ b/src/tesseract/TesseractUI.java
@@ -24,6 +24,7 @@ import javax.vecmath.Vector3f;
 
 import tesseract.forces.Gravity;
 import tesseract.objects.Particle;
+import tesseract.objects.emitters.ParticleEmitter;
 
 import com.sun.j3d.utils.universe.SimpleUniverse;
 
@@ -47,7 +48,7 @@ public class TesseractUI extends JFrame {
 	/**
 	 * Measure of 1 unite of space in the world.
 	 */
-	private static final double UNIT = 1;
+	private static final float UNIT = 1;
 
 	/**
 	 * Number of miliseconds in 1 second.
@@ -99,6 +100,7 @@ public class TesseractUI extends JFrame {
 		// TODO: REMOVE TEST CODE
 		myWorld.addObject(new Particle(new Vector3f(0, 0, 0), null));
 		myWorld.addForce(new Gravity());
+		myWorld.addObject(new ParticleEmitter(new Vector3f(0, 0.49f, 0), 0.5f, null));
 	}
 	
 	/**
diff --git a/src/tesseract/objects/emitters/ParticleEmitter.java b/src/tesseract/objects/emitters/ParticleEmitter.java
new file mode 100644
index 0000000..de5a556
--- /dev/null
+++ b/src/tesseract/objects/emitters/ParticleEmitter.java
@@ -0,0 +1,72 @@
+package tesseract.objects.emitters;
+
+import java.util.LinkedList;
+import java.util.List;
+
+import javax.vecmath.Color3f;
+import javax.vecmath.Vector3f;
+
+import tesseract.objects.Particle;
+import tesseract.objects.PhysicalObject;
+
+/**
+ * ParticleEmitter Class.
+ *
+ * @author Jesse Morgan
+ */
+public class ParticleEmitter extends PhysicalObject {
+
+	/**
+	 * Frequency of new objects.
+	 */
+	private float myFrequency;
+	
+	/**
+	 * The object to create...
+	 */
+	private Color3f myColor;
+	
+	/**
+	 * Counter to keep track of how long has passed.
+	 */
+	private float myCount;
+	
+	/**
+	 * Construct a new Particle Emitter.
+	 * 
+	 * @param position Where to put the emitter
+	 * @param frequency How often to emit the object (seconds).
+	 * @param color Color the particle be (null for random).
+	 */
+	public ParticleEmitter(final Vector3f position, final float frequency,
+			final Color3f color) {
+		
+		super(position);
+		
+		myCount = 0;
+		myFrequency = frequency;
+		myColor = color;
+	}
+
+	/**
+	 * Update State and maybe generate a new object.
+	 * 
+	 * @param duration The length of time that has passed.
+	 * @return A list of new objects to add to the world.
+	 */
+	public List<PhysicalObject> updateState(final float duration) {
+		List<PhysicalObject> children = super.updateState(duration);
+		
+		if (children == null) {
+			children = new LinkedList<PhysicalObject>();
+		}
+		
+		myCount += duration;
+		if (myCount >= myFrequency) {
+			children.add(new Particle(getPosition(), myColor));
+			myCount = 0;
+		}
+		
+		return children;
+	}
+}