x2 = pol.xpoints[1];
y1 = pol.ypoints[0];
y2 = pol.ypoints[1];
Vektor2D verschOrtho = new Vektor2D(x1, y1);
verschOrtho.sub(new Vektor2D(x2, y2));
Vektor2D verschPar = new Vektor2D(verschOrtho);
verschPar.normal();
verschPar.mult(30);
verschOrtho.ortho();
verschOrtho.normal();