Test classes

test/res/bluej-project/Gravity.java

@@ -0,0 +1,40 @@
+
+import java.util.LinkedList;
+
+import schule.ngb.zm.*;
+
+public class Gravity extends Zeichenmaschine {
+    
+    private LinkedList<Mover> movers = new LinkedList<>();
+    
+    private LinkedList<Attractor> attractors = new LinkedList<>();
+    
+    public void setup(){
+         for( int i = 0; i < 10; i++ ) {
+             Mover m = new Mover(random(10, width-10), random(10, height-10));
+             movers.add(m);
+             shapes.add(m);
+         }
+         
+         attractors.add(new Attractor(width/2, height/2, 10));
+         shapes.add(attractors.get(0));
+    }
+    
+    public void update( double delta ) {
+        for( Attractor a: attractors ) {
+            for( Mover m: movers ) {
+                a.attract(m);
+            }
+        }
+        
+        for( Mover m: movers ) {
+            m.update(delta);
+        }
+        shapes.clear();
+    }
+    
+    public void draw() {
+        shapes.clear();
+    }
+    
+}