在AutoCAD中求实体的子实体顶点

Question

我试图找到一个横扫多边形的顶点点。因此，我有一个实体，它是通过沿着三维折线扫描一个圆圈来创建的。看起来是这样的：扫过固体图像

上周谷歌搜索了整个周五，我想我得玩一下这个子实体部分。例如，我找到了如何改变子实体边缘的颜色，但是为了手腕的缘故，我找不出如何访问几何图形。

到目前为止，这是我尝试过的，但正如我在底部指出的那样，我有点迷失了方向：

    [CommandMethod("SubEntExample")]
    public void SubEntExample()
    {
        Document doc = Application.DocumentManager.MdiActiveDocument;
        Database db = doc.Database;
        Editor ed = doc.Editor;

        PromptEntityOptions peo = new PromptEntityOptions("\nSelect a 3D solid: ");
        peo.SetRejectMessage("\nInvalid selection...");
        peo.AddAllowedClass(typeof(Solid3d), true);

        PromptEntityResult per = ed.GetEntity(peo);

        if (per.Status != PromptStatus.OK)
            return;

        using (Transaction Tx = db.TransactionManager.StartTransaction())
        {
            Solid3d solid = Tx.GetObject(per.ObjectId, OpenMode.ForWrite) as Solid3d;

            ObjectId[] ids = new ObjectId[] { per.ObjectId };

            FullSubentityPath path = new FullSubentityPath(ids, new SubentityId(SubentityType.Null, IntPtr.Zero));

            List<SubentityId> subEntIds = new List<SubentityId>();

            using (Autodesk.AutoCAD.BoundaryRepresentation.Brep brep =
                new Autodesk.AutoCAD.BoundaryRepresentation.Brep(path))
            {                    
                foreach (Autodesk.AutoCAD.BoundaryRepresentation.Edge edge in brep.Edges)
                {
                    subEntIds.Add(edge.SubentityPath.SubentId);
                }                    
            }

            foreach (SubentityId subentId in subEntIds)
            {

                *** here i am lost ***

            }
            Tx.Commit();
        }
    }

Answer 1

我的第一个解决方案是掌握所有的方法，并决定哪些是相关的，但是感谢互联网的帮助( :)我想出了一个更好的解决方案

    /// <summary>
    /// Checks if there are boundaryreps that are marked as elliptical or circular arcs
    /// returns true if we found at least 2 of those points
    /// also stores the points in a referenced Point3dCollection
    /// </summary>
    /// <param name="solid"></param>
    /// <param name="pts"></param>
    /// <returns></returns>
    private bool GetSweepPathPoints(Solid3d solid, ref Point3dCollection pts)
    {
        // create boundary rep for the solid
        using (Brep brep = new Brep(solid))
        {
            // get edges of the boundary rep
            BrepEdgeCollection edges = brep.Edges;
            foreach (Edge edge in edges)
            {
                // get the nativ curve geometry of the edges and then 
                // check if it is a circle
                // for more info look at:
                // http://adndevblog.typepad.com/autocad/2012/08/retrieving-native-curve-geometry-using-brep-api.html
                Curve3d curv = ((ExternalCurve3d)edge.Curve).NativeCurve;
                if (curv is CircularArc3d)
                {
                    // transform curved arch into circle and add it to the colecction 
                    // (if not in it alreadz)
                    CircularArc3d circle = curv as CircularArc3d;
                    if (!pts.Contains(circle.Center)) pts.Add(circle.Center);
                }
            }
        }
        return (pts.Count > 1) ? true : false;
    }

我把整件事按以下方式命名

            Point3dCollection pts = new Point3dCollection();
            // only do the whole thing if we face a swept solid
            if (GetSweepPathPoints(sld, ref pts))
            {
                for (int i = 0; i < pts.Count; i++)
                {
                    ed.WriteMessage("\nPt[{0}] = {1}", i, pts[i]);
                }
            }