从 3d Polyline 删除顶点

CSharpBoy

[C#] 纯文本查看 复制代码

[CommandMethod("Remove3DVertex")]
static public void RemoveVertex()
{
    Document doc = Application.DocumentManager.MdiActiveDocument;
    Database db = doc.Database;
    Editor ed = doc.Editor;
 
    using (Transaction oTr =
                        db.TransactionManager.StartTransaction())
    {
        ObjectIdCollection ids = new ObjectIdCollection();
 
        PromptEntityOptions options =
                   new PromptEntityOptions("\nPick a 3DPolyline:");
        options.SetRejectMessage("Select 3DPolyline only" + "\n");
        options.AddAllowedClass(typeof(Polyline3d), true);
        PromptEntityResult result = ed.GetEntity(options);
 
        if (result.Status != PromptStatus.OK)
            return;
 
        Polyline3d oEnt = oTr.GetObject(result.ObjectId,
                                    OpenMode.ForRead) as Polyline3d;
 
 
        foreach (ObjectId oVtId in  oEnt)
        {
            PolylineVertex3d oVt = oTr.GetObject(oVtId,
                            OpenMode.ForRead) as PolylineVertex3d;
            PromptKeywordOptions oPko =
             new PromptKeywordOptions("\nWant to remove vertex at "
                                 + oVt.Position.ToString() + "?");
 
            oPko.AllowNone = false;
            oPko.Keywords.Add("Yes");
            oPko.Keywords.Add("No");
            oPko.Keywords.Default = "No";
            PromptResult oPkr = ed.GetKeywords(oPko);
 
            if (oPkr.Status == PromptStatus.OK
                                && oPkr.StringResult == "Yes")
            {
                ids.Add(oVtId);
            }
        }
 
        foreach (ObjectId oVtId in ids)
        {
            PolylineVertex3d oVt = oTr.GetObject(oVtId,
                        OpenMode.ForWrite) as PolylineVertex3d;
            oVt.Erase();
        }
 
        if (ids.Count != 0)
        {
            oEnt.UpgradeOpen();
            oEnt.RecordGraphicsModified(true);
        }
 
        oTr.Commit();
    }
}

问号兄

为什么要删除顶点？