Spatial partition pattern #562 (#828)

* Spatial partition

* Update pom.xml

* Update Bubble.java - pmd

* Update Rect.java - pmd

spatial-partition/src/main/java/com/iluwatar/spatialpartition/SpatialPartitionBubbles.java

@@ -0,0 +1,52 @@
+/**
+ * The MIT License
+ * Copyright (c) 2014-2016 Ilkka Seppälä
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+package com.iluwatar.spatialpartition;
+
+import java.util.ArrayList;
+import java.util.Hashtable;
+
+/**
+ * This class extends the generic SpatialPartition abstract class and is used in
+ * our example to keep track of all the bubbles that collide, pop and stay un-popped.
+ */
+
+public class SpatialPartitionBubbles extends SpatialPartitionGeneric<Bubble> {
+
+  Hashtable<Integer, Bubble> bubbles;
+  QuadTree qTree;
+
+  SpatialPartitionBubbles(Hashtable<Integer, Bubble> bubbles, QuadTree qTree) {
+    this.bubbles = bubbles;
+    this.qTree = qTree;
+  }
+
+  void handleCollisionsUsingQt(Bubble b) {
+    //finding points within area of a square drawn with centre same as centre of bubble and length = radius of bubble
+    Rect rect = new Rect(b.x, b.y, 2 * b.radius, 2 * b.radius);
+    ArrayList<Point> quadTreeQueryResult = new ArrayList<Point>();
+    this.qTree.query(rect, quadTreeQueryResult);
+    //handling these collisions
+    b.handleCollision(quadTreeQueryResult, this.bubbles);
+  }
+}