finished uebung10

src/uebung10/logo/HanselGretelTest.java

@@ -0,0 +1,30 @@
+package uebung10.logo;
+
+import org.junit.Test;
+import static org.junit.Assert.assertEquals;
+
+import org.junit.Before;
+
+public class HanselGretelTest {
+
+    public static final double EPS = 1e-10;
+    public static final Stmt PROG = new Sequence(new PenDown(), new Go(50),
+        new Turn(120), new Go(50),
+        new Turn(120), new Go(50));
+    
+    private Turtle turtle;
+
+    @Before
+    public void setup() {
+        turtle = new Turtle(2, 1, 0);
+    }
+
+    @Test
+    public void TestTriangle() {
+        final Visitor<Void> visitor = new HanselGretelVisitor(10, turtle, new BlackForest()); //final ist egal
+        PROG.accept(visitor);
+        assertEquals(2, turtle.getX(), EPS);
+        assertEquals(1, turtle.getY(), EPS);
+    }
+
+}

src/uebung10/logo/HanselGretelVisitor.java

@@ -46,6 +46,15 @@ public class HanselGretelVisitor implements Visitor<Void> {
         return null;
     }
 
+    private void breadCrumb() {
+        // TODO Auto-generated method stub
+        throw new UnsupportedOperationException("Unimplemented method 'breadCrumb'");
+    }
+
+    private void layTrail(double d) {
+        forest.breadCrumb(turtle.getX(), turtle.getY());
+    }
+
     private abstract class State {
         abstract void go(double dist);
         void up() {}
@@ -54,20 +63,28 @@ public class HanselGretelVisitor implements Visitor<Void> {
 
     private final State shortUp = new ShortUpState();// muss nicht geschrieben werden
     private final State down = new DownState();// muss nicht geschrieben werden
-    private final State longUp = new LongUpSate();
+    private final State longUp = new State(){
 
-    private class LongUpSate extends State{
-        void go(double d) {}
-        void up(){}
-        void down(){}
-    }
+        @Override
+        void go(double d) {turtle.go(d);}
+
+        @Override
+        void down(){
+            breadCrumb();
+            state = down;
+        }
+
+    };
 
     private class DownState extends State{
-        void go(double d){}
-        void up(){}
-        void down(){}
+        void go(double d){
+            layTrail(d);
+        }
+
+        void up(){state = shortUp;}
     }
 
+    //TODO
     private class ShortUpState extends State {
         void go(double d){}
         void up(){}