Test classes

test/res/bluej-project/Attractor.java

@@ -0,0 +1,29 @@
+
+import schule.ngb.zm.*;
+
+public class Attractor extends Mover {
+
+    private static final int G = 10;
+
+    private int mass = 0;
+
+    public Attractor( int x, int pY, int pMass ) {
+        this(x, pY, pMass, new Vector());
+    }
+
+    public Attractor( int x, int pY, int pMass, Vector pVelocity ) {
+        super(x, pY, pVelocity);
+        mass = pMass;
+
+        setFillColor(YELLOW);
+    }
+
+    public void attract( Mover pMover ) {
+        if( pMover != this ) {
+            Vector force = new Vector(this.x, this.y);
+            force.sub(pMover.getX(), pMover.getY()).scale(mass*G).limit(0, 50*G);
+            pMover.applyForce(force);
+        }
+    }
+
+}