final double minZoom = 0.01;
double xF = this.getWidth();
double yF = this.getHeight();
final Vektor2D mittVek = new Vektor2D(xF / 2, yF / 2);
final Vektor2D mouse = new Vektor2D(e.getPoint());
mouse.sub(mittVek); // TODO
if (e.getWheelRotation() > 0) {
this.skalierung /= konstSkal * Math.abs(e.getWheelRotation());
} else {
this.skalierung *= konstSkal * Math.abs(e.getWheelRotation());