Identifying the boundary through API

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Identifying the boundary through API By Virupaksha Aithal
AutoCAD 2011 introduced a new API to identify the boundary objects for a provided point. Below code shows the use of the same API in .NET. The equivalent ObjectARX API is “acedTraceBoundary”.
Note, only visible entities are considered while identifying the boundary objects.

1. [CommandMethod("BoundaryTest")]
   
2. public static void BoundaryTest()
   
3. {
   
4. Document doc = Application.DocumentManager.MdiActiveDocument;
   
5. Database db = doc.Database;
   
6. Editor ed = doc.Editor;
   
7. 
   
8. PromptPointOptions ptOptions =
   
9.                      new PromptPointOptions("Select point ");
   
10. ptOptions.AllowNone = false;
    
11. PromptPointResult ptResult = ed.GetPoint(ptOptions);
    
12. if (ptResult.Status != PromptStatus.OK)
    
13.      return;
    
14. DBObjectCollection collection =
    
15.                ed.TraceBoundary(ptResult.Value, true);
    
16. using (Transaction Tx =
    
17.            db.TransactionManager.StartTransaction())
    
18. {
    
19.      ObjectId ModelSpaceId =
    
20.             SymbolUtilityServices.GetBlockModelSpaceId(db);
    
21.       BlockTableRecord model = Tx.GetObject(ModelSpaceId,
    
22.                      OpenMode.ForWrite) as BlockTableRecord;
    
23.      foreach (DBObject obj in collection)
    
24.      {
    
25.          Entity ent = obj as Entity;
    
26.          if (ent != null)
    
27.          {
    
28.              //make the color as red.
    
29.              ent.ColorIndex = 1;
    
30.              model.AppendEntity(ent);
    
31.              Tx.AddNewlyCreatedDBObject(ent, true);
    
32.          }
    
33.      }
    
34.      Tx.Commit();
    
35. }
    
36. }
    

[CommandMethod("BoundaryTest")]<br /> public static void BoundaryTest()<br /> {<br /> Document doc = Application.DocumentManager.MdiActiveDocument;<br /> Database db = doc.Database;<br /> Editor ed = doc.Editor;<br /> <br /> PromptPointOptions ptOptions = <br />                      new PromptPointOptions("Select point ");<br /> ptOptions.AllowNone = false;<br /> PromptPointResult ptResult = ed.GetPoint(ptOptions);<br /> if (ptResult.Status != PromptStatus.OK)<br />      return;<br /> DBObjectCollection collection = <br />                ed.TraceBoundary(ptResult.Value, true);<br /> using (Transaction Tx =<br />            db.TransactionManager.StartTransaction())<br /> {<br />      ObjectId ModelSpaceId = <br />             SymbolUtilityServices.GetBlockModelSpaceId(db);<br />       BlockTableRecord model = Tx.GetObject(ModelSpaceId,<br />                      OpenMode.ForWrite) as BlockTableRecord;<br />      foreach (DBObject obj in collection)<br />      {<br />          Entity ent = obj as Entity;<br />          if (ent != null)<br />          {<br />              //make the color as red.<br />              ent.ColorIndex = 1;<br />              model.AppendEntity(ent);<br />              Tx.AddNewlyCreatedDBObject(ent, true);<br />          }<br />      }<br />      Tx.Commit();<br /> }<br /> }<br />