fixed particel to be more object orjented

src/ei/engine/scene/Entity.java

@@ -27,6 +27,9 @@ public abstract class Entity {
 	/** The size of this entity in pixels*/
 	private Vector2f size;
 	
+	/** The z layer of the screen*/
+	private int z = 0;
+	
 	/**
 	 * creates a new entity
 	 * 
@@ -46,6 +49,24 @@ public abstract class Entity {
 		return name;
 	}
 
+	/**
+	 * Get the z value of the entity
+	 * 
+	 * @return The z value
+	 */
+	public int getZ() {
+		return z;
+	}
+	
+	/**
+	 * set the z value of the entity
+	 * 
+	 * @param l The z value to set
+	 */
+	public void setZ(int l) {
+		z = l;
+	}	
+	
 	/**
 	 * Get the Location of the entity
 	 *