Arrows work. mark arrow thinner. refactored marker class.

#fix

src/main/java/seng302/visualiser/GameView.java

@@ -1,13 +1,18 @@
 package seng302.visualiser;
 
 import java.util.ArrayList;
+import java.util.HashMap;
 import java.util.List;
 import javafx.scene.Group;
 import javafx.scene.Node;
+import seng302.model.ClientYacht;
 import seng302.model.Limit;
 import seng302.model.ScaledPoint;
 import seng302.model.mark.CompoundMark;
 import seng302.model.mark.Corner;
+import seng302.model.mark.Mark;
+import seng302.utilities.Sounds;
+import seng302.visualiser.fxObjects.Marker;
 
 /**
  * Abstract class for keeping functionality common between race visualisation.
@@ -24,8 +29,36 @@ public abstract class GameView {
     List<CompoundMark> course = new ArrayList<>();
     List<CompoundMark> compoundMarks = new ArrayList<>();
     List<Corner> courseOrder = new ArrayList<>();
+    HashMap<Mark, Marker> markerObjects = new HashMap<>();
 
     public abstract Node getAssets();
     public abstract void updateCourse(List<CompoundMark> newCourse, List<Corner> sequence);
     public abstract void updateBorder(List<Limit> border);
+
+    void updateMarkArrows (ClientYacht yacht, int legNumber) {
+        CompoundMark compoundMark;
+        if (legNumber - 1 >= 0 && legNumber-1 < course.size()) {
+            Sounds.playMarkRoundingSound();
+            compoundMark = course.get(legNumber-1);
+            for (Mark mark : compoundMark.getMarks()) {
+                markerObjects.get(mark).showNextExitArrow();
+            }
+        }
+        CompoundMark nextMark = null;
+        if (legNumber < course.size()) {
+            Sounds.playMarkRoundingSound();
+            nextMark = course.get(legNumber);
+            for (Mark mark : nextMark.getMarks()) {
+                markerObjects.get(mark).showNextEnterArrow();
+            }
+        }
+        if (legNumber - 2 >= 0) {
+            CompoundMark lastMark = course.get(Math.max(0, legNumber - 2));
+            if (lastMark != nextMark) {
+                for (Mark mark : lastMark.getMarks()) {
+                    markerObjects.get(mark).hideAllArrows();
+                }
+            }
+        }
+    }
 }