Finish AB4

src/NamedBodyForcePair.java

@@ -1,28 +1,93 @@
+import codedraw.CodeDraw;
+
 /**
  * A body with a name and an associated force. The leaf node of
  * a hierarchical cosmic system. This class implements 'CosmicSystem'.
  */
-public class NamedBodyForcePair /* TODO: add clause */ {
+public class NamedBodyForcePair implements CosmicSystem {
 
-    // TODO: define missing parts of this class.
+    private final String name;
+    private final Body body;
+    private final Vector3 force = new Vector3();
 
     /**
      * Initializes this with name, mass, current position and movement. The associated force
      * is initialized with a zero vector.
      */
     public NamedBodyForcePair(String name, double mass, Vector3 massCenter, Vector3 currentMovement) {
-        // TODO: implement constructor.
+        this(name, new Body(mass, massCenter, currentMovement));
+    }
+
+    public NamedBodyForcePair(String name, Body b) {
+        this.body = b;
+        this.name = name;
     }
 
     public NamedBodyForcePair(NamedBodyForcePair other) {
-        // TODO
+        this(other.name, new Body(other.body));
+    }
+
+    public Body getBody() {
+        return body;
     }
 
     /**
      * Returns the name of the body.
      */
     public String getName() {
-        // TODO: implement method.
-        return "";
+        return name;
+    }
+
+    @Override
+    public String toString() {
+        return this.getName();
+    }
+
+    @Override
+    public Vector3 getMassCenter() {
+        return body.massCenter();
+    }
+
+    @Override
+    public double getMass() {
+        return body.mass();
+    }
+
+    @Override
+    public int numberOfBodies() {
+        return 1;
+    }
+
+    @Override
+    public double distanceTo(CosmicSystem cs) {
+        return getMassCenter().distanceTo(cs.getMassCenter());
+    }
+
+    @Override
+    public void addForceFrom(Body b) {
+        force.add(body.gravitationalForce(b));
+    }
+
+    @Override
+    public void addForceTo(CosmicSystem cs) {
+        cs.addForceFrom(body);
+    }
+
+    @Override
+    public BodyLinkedList getBodies() {
+        BodyLinkedList list = new BodyLinkedList();
+        list.addFirst(body);
+        return list;
+    }
+
+    @Override
+    public void update() {
+        body.move(force);
+        force.set(0);
+    }
+
+    @Override
+    public void draw(CodeDraw cd) {
+        body.draw(cd);
     }
 }