Resolve "Fix large grid display"

Closes #110 (closed)

game-of-life/src/main/java/fr/ippon/life/Grid.java

@@ -8,21 +8,26 @@ import java.util.stream.Stream;
 
 public class Grid {
 
+  private final Set<Cell> aliveCells;
   private final Set<Cell> deadCells;
   private final Box border;
 
   Grid(Set<Cell> aliveCells) {
+    this.aliveCells = aliveCells;
     this.deadCells = buildDeadCells(aliveCells);
     border = new Box(aliveCells);
   }
 
   private Set<Cell> buildDeadCells(Set<Cell> aliveCells) {
-    return aliveCells
-      .stream()
-      .map(Box::new)
-      .flatMap(Box::cells)
-      .filter(cell -> !aliveCells.contains(cell))
-      .collect(Collectors.toUnmodifiableSet());
+    return aliveCells.stream()
+        .map(Box::new)
+        .flatMap(Box::cells)
+        .filter(cell -> !aliveCells.contains(cell))
+        .collect(Collectors.toUnmodifiableSet());
+  }
+
+  public boolean isAlive(Cell cell) {
+    return aliveCells.contains(cell);
   }
 
   public Collection<Cell> deadCells() {
@@ -60,11 +65,15 @@ public class Grid {
     }
 
     private Stream<Cell> cells() {
-      return IntStream.range(leftColumn(), rightColumn()).mapToObj(Integer::valueOf).flatMap(column -> cellsColumn(column));
+      return IntStream.range(leftColumn(), rightColumn())
+          .mapToObj(Integer::valueOf)
+          .flatMap(column -> cellsColumn(column));
     }
 
     private Stream<Cell> cellsColumn(Integer column) {
-      return IntStream.range(topRow(), bottomRow()).mapToObj(Integer::valueOf).map(row -> new Cell(row, column));
+      return IntStream.range(topRow(), bottomRow())
+          .mapToObj(Integer::valueOf)
+          .map(row -> new Cell(row, column));
     }
 
     public int topRow() {
@@ -95,17 +104,29 @@ public class Grid {
     }
 
     private static Point topLeft(Set<Cell> cells) {
-      int row = cells.stream().mapToInt(Cell::row).min().orElse(0);
+      int row = cells.stream()
+          .mapToInt(Cell::row)
+          .min()
+          .orElse(0);
 
-      int column = cells.stream().mapToInt(Cell::column).min().orElse(0);
+      int column = cells.stream()
+          .mapToInt(Cell::column)
+          .min()
+          .orElse(0);
 
       return new Point(row - 1, column - 1);
     }
 
     private static Point bottomRight(Set<Cell> cells) {
-      int row = cells.stream().mapToInt(Cell::row).max().orElse(0);
-
-      int column = cells.stream().mapToInt(Cell::column).max().orElse(0);
+      int row = cells.stream()
+          .mapToInt(Cell::row)
+          .max()
+          .orElse(0);
+
+      int column = cells.stream()
+          .mapToInt(Cell::column)
+          .max()
+          .orElse(0);
 
       return new Point(row + 1, column + 1);
     }