Spatial partition pattern #562 (#828)

* Spatial partition * Update pom.xml * Update Bubble.java - pmd * Update Rect.java - pmd
2018-12-23 03:07:31 +05:30
parent 7b8c9b07ed
commit a6749cb63e
14 changed files with 914 additions and 0 deletions
--- a/spatial-partition/src/main/java/com/iluwatar/spatialpartition/Bubble.java
+++ b/spatial-partition/src/main/java/com/iluwatar/spatialpartition/Bubble.java
@@ -0,0 +1,77 @@
+/**
+ * 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;
+import java.util.Random;
+
+/**
+ * Bubble class extends Point. In this example, we create several bubbles in the field,
+ * let them move and keep track of which ones have popped and which ones remain.
+ */
+
+public class Bubble extends Point<Bubble> {
+
+  final int radius;
+
+  Bubble(int x, int y, int id, int radius) {
+    super(x,y,id);
+    this.radius = radius;
+  }
+
+  void move() {
+    Random rand = new Random();
+    //moves by 1 unit in either direction
+    this.x += rand.nextInt(3) - 1;
+    this.y += rand.nextInt(3) - 1;
+  }
+
+  boolean touches(Bubble b) {
+    //distance between them is greater than sum of radii (both sides of equation squared)
+    return (this.x - b.x) * (this.x - b.x) + (this.y - b.y) * (this.y - b.y)
+                <= (this.radius + b.radius) * (this.radius + b.radius);
+  }
+
+  void pop(Hashtable<Integer, Bubble> allBubbles) {
+    System.out.println("Bubble " + this.id + " popped at (" + this.x + "," + this.y + ")!");
+    allBubbles.remove(this.id);
+  }
+
+  void handleCollision(ArrayList<Point> bubblesToCheck, Hashtable<Integer, Bubble> allBubbles) {
+    boolean toBePopped = false; //if any other bubble collides with it, made true
+    for (int i = 0; i < bubblesToCheck.size(); i++) {
+      Integer otherId = bubblesToCheck.get(i).id;
+      if (allBubbles.get(otherId) != null && //the bubble hasn't been popped yet
+                    this.id != otherId && //the two bubbles are not the same
+                    this.touches(allBubbles.get(otherId))) { //the bubbles touch
+        allBubbles.get(otherId).pop(allBubbles);
+        toBePopped = true;
+      }
+    }
+    if (toBePopped) {
+      this.pop(allBubbles);
+    }
+  }
+}