RumbleBot markFiringLines

src/RumbleBot.java

         for (int i = 0; i < data.length(); i++) {
             grid[i % size][i / size] = data.charAt(i);
         }
-        return markFiringLines(grid);
+        return grid;
     }
 
-    protected char[][] markFiringLines(char[][] grid) {
-        return grid;
+    protected void markFiringLines(char[][] grid) {
+        int size = grid.length;
+        for (int x = 0; x < size; x++) {
+            for (int y = 0; y < size; y++) {
+
+                if (grid[x][y] == 'v') {
+                    int scanY = y;
+                    while (scanY < size && !obstacles.contains("" + grid[x][y])) {
+                        if (grid[x][scanY] == '.')
+                            grid[x][scanY] = '*';
+                        scanY++;
+                    }
+                }
+
+                if (grid[x][y] == '^') {
+                    int scanY = y;
+                    while (scanY >= 0 && !obstacles.contains("" + grid[x][y])) {
+                        if (grid[x][scanY] == '.')
+                            grid[x][scanY] = '*';
+                        scanY--;
+                    }
+                }
+
+                if (grid[x][y] == '>') {
+                    int scanX = x;
+                    while (scanX < size && !obstacles.contains("" + grid[x][y])) {
+                        if (grid[scanX][y] == '.')
+                            grid[scanX][y] = '*';
+                        scanX++;
+                    }
+                }
+
+                if (grid[x][y] == '<') {
+                    int scanX = x;
+                    while (scanX >= 0 && !obstacles.contains("" + grid[x][y])) {
+                        if (grid[scanX][y] == '.')
+                            grid[scanX][y] = '*';
+                        scanX--;
+                    }
+                }
+
+            }
+        }
     }
 
     protected boolean isInLineOfSight(char[][] grid) {
     }
 
     protected char breadthFirstSearch(char[][] grid) {
+        markFiringLines(grid);
         int size = grid.length;
         int start = size / 2;