Vector2D normAnf = new Vector2D(punkte.get(0));
Vector2D orthoAnf;
normAnf.sub(punkte.get(1));
normAnf.norm();
orthoAnf = new Vector2D(normAnf);
orthoAnf.ortho();
Iterator<Vector2D> it1 = pfeilAnfang.iterator();
Polygon2D zwisch = new Polygon2D();
while (it1.hasNext()) {
aktVek = it1.next();