public void Clear()
{
_polyLines = new List <PolyLine>();
_MBR = new RectangleD();
}
////加入点，效率不高，用到的较少
//public void AddPoint(PointD point)
//{
// PointD[] mPoints = new PointD[_Points.Length + 1];
// for(int i = 0; i < _Points.Length; i++)
// {
// mPoints[i] = _Points[i];
// }
// mPoints[_Points.Length + 1] = point;
// _Points = mPoints;
//}
public void Clear()
{
_Points = null;
_MBR = new RectangleD();
}
public void Clear()
{
_Polygons = new List <Polygon>();
_MBR = new RectangleD();
}