Patch: +get4Neighbors(), get8Neighbors(), clone()

src/Grid.java

@@ -18,6 +18,22 @@ public class Grid {
         }
     }
 
+    private static int normalizeX(int x) {
+        while (x >= getWidth())
+            x -= getWidth();
+        while (x < 0)
+            x += getWidth();
+        return x;
+    }
+
+    private static int normalizeY(int y) {
+        while (y >= getHeight())
+            y -= getHeight();
+        while (y < 0)
+            y += getHeight();
+        return y;
+    }
+
     public int getWidth() {
         return _grid.length;
     }
@@ -27,10 +43,14 @@ public class Grid {
     }
 
     public Patch getPatch(int x, int y) {
+        x = normalizeX(x);
+        y = normalizeY(y);
         return _grid[x][y];
     }
 
     public void setPatch(int x, int y, Patch p) {
+        x = normalizeX(x);
+        y = normalizeY(y);
         _grid[x][y] = p;
     }
 

src/Patch.java

@@ -3,10 +3,10 @@ package edu.stuy.goldfish;
 public class Patch {
     private int _xcor, _ycor, _state;
     private String _label;
-    private Grid _myGrid;
+    private Grid _grid;
 
     public Patch(Grid grid, int xcor, int ycor, int state, String label) {
-        _myGrid = grid;
+        _grid = grid;
         _xcor = xcor;
         _ycor = ycor;
         _state = state;
@@ -48,4 +48,28 @@ public class Patch {
     public String toString() {
         return _plabel;
     }
-}    
+
+    public Patch[] get4Neighbors() {
+        Patch[] neighbors = new Patch[4];
+        neighbors[0] = _grid.getPatch(_xcor + 1, _ycor);
+        neighbors[1] = _grid.getPatch(_xcor - 1, _ycor);
+        neighbors[2] = _grid.getPatch(_xcor, _ycor + 1);
+        neighbors[3] = _grid.getPatch(_xcor, _ycor - 1);
+    }
+
+    public Patch[] get8Neighbors() {
+        Patch[] neighbors = new Patch[8];
+        neighbors[0] = _grid.getPatch(_xcor + 1, _ycor);
+        neighbors[1] = _grid.getPatch(_xcor - 1, _ycor);
+        neighbors[2] = _grid.getPatch(_xcor, _ycor + 1);
+        neighbors[3] = _grid.getPatch(_xcor, _ycor - 1);
+        neighbors[4] = _grid.getPatch(_xcor + 1, _ycor + 1);
+        neighbors[5] = _grid.getPatch(_xcor + 1, _ycor - 1);
+        neighbors[6] = _grid.getPatch(_xcor - 1, _ycor + 1);
+        neighbors[7] = _grid.getPatch(_xcor - 1, _ycor - 1);
+    }
+
+    public Patch clone() {
+        return new Patch(_grid, _xcor, _ycor, _state, _label);
+    }
+}