float a=0, a2=0, b=0, b2=0, xt=0, yt=0;
                int Z = 20;
                if (vertex2.X - vertex1.X == 0)
                {
                    drawPoint.X = vertex2.X + Z;//x punktu
                    drawPoint.Y = (vertex1.Y + vertex2.Y) / 2;//y punktu
                }
                else
                {
                    a = (float)(vertex2.Y - vertex1.Y) / (vertex2.X - vertex1.X);
                    if (a == 0)
                    {
                        drawPoint.X = (float)(vertex1.X + vertex2.X) / 2;//x punktu
                        drawPoint.Y = vertex2.Y + Z;//y puntku
                        b = ((float)(vertex2.X * vertex1.Y - vertex1.X * vertex2.Y) / (vertex2.X - vertex1.X));
                    }
                    else
                    {
                        a2 = -1 / a;
                        b = ((vertex2.X * vertex1.Y - vertex1.X * vertex2.Y) / (vertex2.X - vertex1.X));
                        b2 = (float)((Math.Pow(vertex2.Y, 2) + Math.Pow(vertex2.X, 2) - Math.Pow(vertex1.Y, 2) - Math.Pow(vertex1.X, 2)) / (2 * vertex2.Y - 2 * vertex1.Y));
                        float C = (float)Math.Sqrt(Math.Pow(a, 2) + 1);
                        float D = (float)((vertex1.Y - vertex2.Y) * (vertex2.Y - vertex1.Y) + (vertex1.X - vertex2.X) * (vertex2.X - vertex1.X)) / ((vertex2.X - vertex1.X) * (vertex2.Y - vertex1.Y));
                        xt = (float)(Z * C + b - b2) / D;
                        yt = a2 * xt + b2;
                        if ((a * xt + yt + b) > 0)
                        {
                            drawPoint.X = xt;
                            drawPoint.Y = yt;
                        }
                        else
                        {
                            drawPoint.X = (float)(-Z * C + b - b2) / D;//x punktu
                            drawPoint.Y = a2 * drawPoint.X + b2;//y punktu
                        }
                    }
                }