Fix/solution (#2)

* Add parameter to run the visualizer with different directions

* Add default constructor

* Add annotation do emphasize the parts of the code which should be modified by the students

* Revert annotations

src/main/java/h06/ui/MazeVisualizer.java

@@ -21,6 +21,13 @@ public class MazeVisualizer implements ProblemVisualizer {
      */
     private World world;
 
+
+    /**
+     * Constructs a maze visualizer.
+     */
+    public MazeVisualizer() {
+    }
+
     @Override
     public void init(World world) {
         this.world = world;
@@ -47,16 +54,16 @@ public void show(boolean visible) {
     }
 
     @Override
-    public void run(ProblemSolver solver, Point s, Point e) {
-        Point[] path = solver.solve(world, s, e, DirectionVector.UP);
+    public void run(ProblemSolver solver, Point s, Point e, DirectionVector d) {
+        Point[] path = solver.solve(world, s, e, d);
+        Robot robot = new Robot(s.x, s.y, Direction.values()[d.ordinal()], 0);
+
         fopbot.World.getGlobalWorld().setFieldColor(s.x, s.y, Color.BLUE);
         fopbot.World.getGlobalWorld().setFieldColor(e.x, e.y, Color.YELLOW);
-        Robot mazeRunner = new Robot(s.x, s.y);
-
         for (int i = 1; i < path.length; i++) {
             Point p = path[i];
-            int x = mazeRunner.getX();
-            int y = mazeRunner.getY();
+            int x = robot.getX();
+            int y = robot.getY();
 
             // Compute movement direction
             Direction direction;
@@ -71,12 +78,12 @@ public void run(ProblemSolver solver, Point s, Point e) {
             }
 
             // Turn robot to the correct direction and then move
-            while (mazeRunner.getDirection() != direction) {
-                mazeRunner.turnLeft();
+            while (robot.getDirection() != direction) {
+                robot.turnLeft();
             }
-            mazeRunner.move();
+            robot.move();
         }
-        mazeRunner.turnOff();
+        robot.turnOff();
     }
 
     @Override

src/main/java/h06/ui/ProblemVisualizer.java

@@ -1,6 +1,7 @@
 package h06.ui;
 
 import h06.problems.ProblemSolver;
+import h06.world.DirectionVector;
 import h06.world.World;
 
 import java.awt.Point;
@@ -39,8 +40,9 @@ default void show() {
      * @param solver the solver to use
      * @param s      the start point
      * @param e      the end point
+     * @param d      the direction to start with
      */
-    void run(ProblemSolver solver, Point s, Point e);
+    void run(ProblemSolver solver, Point s, Point e, DirectionVector d);
 
     /**
      * Sets the delay between each step in milliseconds.