Implement Aging

README.md

@@ -30,4 +30,8 @@ By passing the LifeBoard to the constructor of the engine,  I'm also removing th
 
 ## Hide The Board's Implementation
 
-I can now hide the implementation of the board and all tests still pass.  This opens the way to change the actual implementation.
+I can now hide the implementation of the board and all tests still pass.  This opens the way to change the actual implementation.
+
+## Implement Aging
+
+Now my new LifeBoard implementation implements an aging feature.  Every time a cell is made "alive" it gets one generation older.  This can be used to change the display to show different colors or intensities.

src/main/java/LifeBoard.java

@@ -4,28 +4,28 @@
 public class LifeBoard implements Board {
     public static final int X_MAX = 50;
     public static final int Y_MAX = 50;
-    private boolean[][] value = new boolean[X_MAX][Y_MAX];
+    private int[][] value = new int[X_MAX][Y_MAX];
 
     public void clear() {
         for(int x=0; x < X_MAX; ++x) {
             for(int y=0; y < Y_MAX; ++y) {
-                value[x][y] = false;
+                value[x][y] = 0;
             }
         }
     }
 
     public int at(int x, int y) {
-        if (value[x][y]) {
+        if (value[x][y] > 0) {
             return 1;
         }
         return 0;
     }
 
     public void set(int x, int y, int value) {
         if (0 == value) {
-            this.value[x][y] = false;
+            this.value[x][y] = 0;
         } else {
-            this.value[x][y] = true;
+            this.value[x][y] = this.value[x][y] + 1;
         }
     }
 }