published new recipe - SimplePuzzle w/Jim

Author: lynnlangit

src/org/teachingkidsprogramming/recipes/completed/SimplePuzzle.java

@@ -0,0 +1,87 @@
+package org.teachingkidsprogramming.recipes.completed;
+
+import java.awt.EventQueue;
+import java.util.Arrays;
+import java.util.Random;
+
+import javax.swing.UIManager;
+import javax.swing.UnsupportedLookAndFeelException;
+
+import org.teachingextensions.logo.AStarPlayer;
+import org.teachingextensions.logo.Puzzle;
+import org.teachingextensions.logo.PuzzleAnimation;
+import org.teachingextensions.logo.PuzzleBoard;
+import org.teachingextensions.logo.PuzzleState;
+import org.teachingextensions.logo.PuzzleWindow;
+import org.teachingextensions.windows.MessageBox;
+
+public class SimplePuzzle implements Runnable
+{
+  public Puzzle      puzzle   = null;
+  public PuzzleState solution = null;
+  public int[]       cells    = {0, 1, 2, 3, 4, 5, 6, 7, 8};
+  public static void main(String[] args)
+  {
+    EventQueue.invokeLater(new SimplePuzzle());
+  }
+  public static int[] shuffled(int[] source)
+  {
+    int[] copy = Arrays.copyOf(source, source.length);
+    Random rnd = new Random();
+    for (int i = copy.length - 1; i > 0; i--)
+    {
+      int index = rnd.nextInt(i + 1);
+      int a = copy[index];
+      copy[index] = copy[i];
+      copy[i] = a;
+    }
+    return copy;
+  }
+  @Override
+  public void run()
+  {
+    this.setLookAndFeel();
+    //  Do this until the player finds the solution -- #6.1
+    while (solution == null)
+    {
+      //  Create a Message Box that shows the message "Looking for puzzle solution..." -- #4
+      MessageBox.showMessage("Looking for puzzle solution...");
+      //  Try to create a solvable puzzle -- #5.1
+      try
+      {
+        //   Create an array of integers named 'shuffled' which shuffles the cell array -- #2.1
+        int[] shuffled = shuffled(cells);
+        //   Make the puzzle use the cells array, run it, then use the shuffled array -- #2.2        
+        puzzle = new Puzzle(shuffled);
+        //   Create a AStarPlayer named 'player' which uses the current puzzle -- #3.1
+        AStarPlayer player = new AStarPlayer(puzzle);
+        //   Create a solution by telling the player to solve it -- #3.2 TIP: Not all puzzles can be solved! 
+        //  NOTE for teacher - have kids run it multiple times here to see that sometimes it fails
+        solution = player.solve();
+        //  End of try --#5.2
+      }
+      catch (Exception e)
+      {
+        // Create a Message Box that shows the message "This puzzle is not solvable, click ok to try again" -- #5.4
+        MessageBox.showMessage("This puzzle is not solvable, click ok to try again");
+        // End of catch --#5.3
+      }
+      // End of while --#6.2
+    }
+    PuzzleBoard board = new PuzzleBoard(puzzle, solution);
+    //  Create a new Puzzle Window that takes a parameter named board -- #1
+    new PuzzleWindow(board);
+    new Thread(new PuzzleAnimation(board)).start();
+  }
+  private void setLookAndFeel()
+  {
+    try
+    {
+      UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
+    }
+    catch (ClassNotFoundException | InstantiationException | UnsupportedLookAndFeelException
+        | IllegalAccessException ignored)
+    {
+    }
+  }
+}

src/org/teachingkidsprogramming/section08tdd/SimplePuzzle.java

@@ -7,29 +7,27 @@
 import javax.swing.UIManager;
 import javax.swing.UnsupportedLookAndFeelException;
 
-import org.teachingextensions.logo.AStarPlayer;
 import org.teachingextensions.logo.Puzzle;
 import org.teachingextensions.logo.PuzzleAnimation;
 import org.teachingextensions.logo.PuzzleBoard;
-import org.teachingextensions.logo.PuzzlePlayer;
 import org.teachingextensions.logo.PuzzleState;
-import org.teachingextensions.logo.PuzzleWindow;
 
 public class SimplePuzzle implements Runnable
 {
+  public Puzzle      puzzle   = null;
+  public PuzzleState solution = null;
+  public int[]       cells    = {0, 1, 2, 3, 4, 5, 6, 7, 8};
   public static void main(String[] args)
   {
     EventQueue.invokeLater(new SimplePuzzle());
   }
-  @SuppressWarnings("unused")
-  private static int[] shuffled(int[] source)
+  public static int[] shuffled(int[] source)
   {
     int[] copy = Arrays.copyOf(source, source.length);
     Random rnd = new Random();
     for (int i = copy.length - 1; i > 0; i--)
     {
       int index = rnd.nextInt(i + 1);
-      // Simple swap
       int a = copy[index];
       copy[index] = copy[i];
       copy[i] = a;
@@ -40,15 +38,21 @@ private static int[] shuffled(int[] source)
   public void run()
   {
     this.setLookAndFeel();
-    //    int[] cells = {0, 1, 2, 3, 4, 5, 6, 7, 8};
-    //    int[] shuffled = shuffled(cells);
-    int[] shuffled = {5, 6, 2, 4, 1, 8, 7, 0, 3}; // known to be solvable
-    Puzzle puzzle = new Puzzle(shuffled);
-    PuzzlePlayer player = new AStarPlayer(puzzle);
-    PuzzleState solution = player.solve();
+    //  Do this until the player finds the solution -- #6.1
+    //  Create a Message Box that shows the message "Looking for puzzle solution..." -- #4
+    //  Try to create a solvable puzzle -- #5.1
+    //  Create an array of integers named 'shuffled' which shuffles the cell array -- #2.1
+    //  Make the puzzle use the cells array, run it, then use the shuffled array -- #2.2 
+    puzzle = new Puzzle(cells);
+    //  Create a AStarPlayer named 'player' which uses the current puzzle -- #3.1
+    //  Create a solution by telling the player to solve it -- #3.2 TIP: Not all puzzles can be solved! 
+    //  NOTE for teacher - have kids run it multiple times here to see that sometimes it fails
+    //  End of try --#5.2
+    //  Create a Message Box that shows the message "This puzzle is not solvable, click ok to try again" -- #5.4
+    //  End of catch --#5.3
+    //  End of while --#6.2
     PuzzleBoard board = new PuzzleBoard(puzzle, solution);
-    PuzzleWindow pw = new PuzzleWindow(board);
-    pw.setVisible(true);
+    //  Create a new Puzzle Window that takes a parameter named board -- #1
     new Thread(new PuzzleAnimation(board)).start();
   }
   private void setLookAndFeel()