polyline转polyline2d

在cad 中新画一条多段线是，控制多段线是polyline2d还是polyline的系统变量为 pline 。输入plinetype，输入 2 ，即多段线设置为polyline，如果输入0，则系统默认多段线为polyline2d。

 

 多段线转2d

public static void Convert2dToPolyline()
{ using var tr = new DBTrans();
    try
    {
        Polyline pl = tr.Database.GetEntity("").Clone() as Polyline;
        var pl2d = pl.ConvertTo(false);
        pl2d.ColorIndex = 1;
        tr.ModelSpace.AddEntity(pl2d);
    }
    catch { }
    tr.Editor .Redraw();
 
   
    //pl.ConvertFrom(pl22,false);
    //tr.ModelSpace.AddEntity(pl);
}

2d转多段线：

public static void Convert2top ()
{
    using var tr = new DBTrans();
    try
    {
        Polyline2d pl2d = tr.Database.GetEntity("").Clone() as Polyline2d;
        Polyline pl = new Polyline();
        pl.ConvertFrom(pl2d,false);
        pl.ColorIndex =2;
        tr.ModelSpace.AddEntity(pl);
    }
    catch { }
    tr.Editor.Redraw();


    //pl.ConvertFrom(pl22,false);
    //tr.ModelSpace.AddEntity(pl);
}