private PointF CalculateNodeOffset(PointF[] newPoints)
{
//Rect可能发生变化，需要计算偏移
GraphicsPath path = new GraphicsPath(newPoints, _types);
RectangleF rf = path.GetBounds();
path.Dispose();
NewRect = rf;
PointF p1 = Calculation.CalcMatrixPoint(DataBk, PointF.Empty);
PointF p2 = Calculation.CalcMatrixPoint(this, PointF.Empty);
return(new PointF(p1.X - p2.X, p1.Y - p2.Y));
}