private void setPosition(Point2D point, int x, int y) {
point.x = x;
point.y = y;
}
private Point2D findNewNodePosition(Point2D left, Point2D right) {
Point2D newPoint = new Point2D();
newPoint.x = (left.x + right.x + right.y - left.y) / 2;
newPoint.y = (left.y + right.y + right.x - left.x) / 2;
return newPoint;
}