public List <Point> Intersection(Cirlce cirlse2)
        {
            double distance = VectorOperations.CalcLenghtVector(this.Center, cirlse2.Center);

            if (this.Radius + cirlse2.Radius < distance || this.Abs(this.Radius + cirlse2.Radius) > distance)
            {
                return(null);
            }
            else
            {
                double catetFirstCircle     = ((this.Radius * this.Radius) - (cirlse2.Radius * cirlse2.Radius) + (distance * distance)) / (2 * distance);
                double hight                = Math.Sqrt((this.Radius * this.Radius) - (catetFirstCircle * catetFirstCircle));
                double intersectionpointX   = this.Center.X + (catetFirstCircle * (cirlse2.Center.X - this.Center.X) / distance);
                double intersectionpointY   = this.Center.Y + (catetFirstCircle * (cirlse2.Center.Y - this.Center.Y) / distance);
                Point  pointForIntersection = new Point(intersectionpointX, intersectionpointY);

                intersectionpointX = pointForIntersection.X + (hight * (cirlse2.Center.Y - this.Center.Y) / distance);
                intersectionpointY = pointForIntersection.Y - (hight * (cirlse2.Center.X - this.Center.X) / distance);

                Point firstResaultPoint = new Point(intersectionpointX, intersectionpointY);

                intersectionpointX = pointForIntersection.X - (hight * (cirlse2.Center.Y - this.Center.Y) / distance);
                intersectionpointY = pointForIntersection.Y + (hight * (cirlse2.Center.X - this.Center.X) / distance);

                Point secondResaultPoint = new Point(intersectionpointX, intersectionpointY);

                return(new List <Point> {
                    firstResaultPoint, secondResaultPoint
                });
            }
        }
 public void ChangeSize(Point point, Point point2)
 {
     this.Center       = point;
     this.PointOnBoard = point2;
     this.Radius       = VectorOperations.CalcLenghtVector(point, point2);
 }
 public Cirlce(Point center, Point pointOnBoard)
 {
     this.Center       = center;
     this.PointOnBoard = pointOnBoard;
     this.Radius       = VectorOperations.CalcLenghtVector(center, pointOnBoard);
 }