获取curve中点（CAD—C#二次开发入门）

 效果如下：

 

   public void XX()
   {
      // var a = Z.db.GetEntity("");
      // var b = Z.db.GetEntity("");
      // Point3dCollection pos = new Point3dCollection();//创建点集合
      //a.IntersectWith(b, Intersect.OnBothOperands, pos, IntPtr.Zero, IntPtr.Zero);
       //PersonG.Go();
       List<Curve> ents = Z.db.SelectEntities<Curve>();
       foreach (var item in ents)
       {
           double len = item.GetDistanceAtParameter(item.EndParam);
           Point3d pt = item.GetPointAtDist(len/2);
           Circle circle = new Circle() { Center = pt, Radius = 0.1, ColorIndex = 1 };
           Z.db.AddEntityToModeSpace(circle);
       }

       // Polyjig.DrawPLJig();
       // CircleJig.DraCJig();
       //Z.db.CurvesToPolyLine(ents);
       // Outershape.Demo();
   }