Removing Surface Breaklines using AutoCAD Civil 3D API

Sep 25, 2013

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AutoCAD Civil
3D COM API has IAeccSurfaceBreaklines:: Remove method to remove Surface
Breaklines. In the ‘ActiveX API Reference’ document we see this –

IAeccSurfaceBreaklines::
Remove Method – > Removes an item from the collection, specified by index or
object reference.

HRESULT
Remove( [in] VARIANT varIndex);

One of our
Civil 3D application developers friend recently asked me ‘how do we use object
reference in Remove()’ ? That prompted me to dig deeper in this and I find we
can only use index in the Remove() and it doesn’t work with object reference. By
the time we update the Civil 3D ActiveX API reference document on this, I
thought it would be useful to you all if I share this information here in IM
DevBlog.

Here is the
VB.NET code snippet showing usage of COM API Remove(index) –

If(oTinSurface.Breaklines.Count > 0)
 
  ' Remove() Breakline using COM API
  oTinSurface.Breaklines.Remove(0)
  oTinSurface.Rebuild()
  ed.WriteMessage(vbCrLf + "Breakline Removed ! " )
 
End If

In Civil 3D .NET API we have the equivalent RemoveAt(int)
and here is C# .NET code snippet –

// Get the TIN Surface

TinSurface tinSurface = surfaceId.GetObject(OpenMode.ForWrite) as TinSurface;
 
// Lets try to Remove Breakline using RemoveAt(int)        
  tinSurface.BreaklinesDefinition.RemoveAt(0);
 
// rebuild the surface
  tinSurface.Rebuild();

Hope this is useful to you!

Comments

3 responses to “Removing Surface Breaklines using AutoCAD Civil 3D API”

James Maeding

September 30, 2013

this is a big deal, as I recall I could only remove groups of breaklines before.
I have tools that make 3d plines and add to a surface. Updates need the ability to remove items and add on a pline by pline basis.
Are you sure this does not refer to groups of breaklines, as that is not what I need. thanks

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Partha Sarkar

October 3, 2013

Hi James –
Which release of Civil 3D and what API (COM / .NET) you used >>> I recall I could only remove groups of breaklines before. <<<
If you provide me these details, I can investigate it further.
Thanks,
Partha Sarkar
ADN

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Reply
Augusto Goncalves

March 25, 2015

James,
It’s being a while… but I made some testing with this: the RemoveAt will act at the operation level, not at each breakline. For instance, if you add a Std Breakline and select 3 plines, the RemoveAt will remove all 3 plines.
Database db = Application.DocumentManager.MdiActiveDocument.Database;
using (Transaction trans = db.TransactionManager.StartTransaction())
{
TinSurface tinSurface = trans.GetObject(surfaceId, OpenMode.ForWrite) as TinSurface;
for (int b = 0; b < tinSurface.BreaklinesDefinition.Count; b++)
{
SurfaceOperationAddBreakline operation = tinSurface.BreaklinesDefinition[b];
// the RemoveAt will act at this level
ed.WriteMessage(“\n{0}”, operation.Description);
foreach (SurfaceBreakline breakline in operation)
{
// this level don’t have a Remove method…
ed.WriteMessage(“\n\t{0}”, breakline.Description);
}
}
//tinSurface.BreaklinesDefinition.RemoveAt(…);
//tinSurface.Rebuild();
//trans.Commit();
}
Regards,
Augusto Goncalves

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Removing Surface Breaklines using AutoCAD Civil 3D API

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