[V8i SS3 C# VBA] How to identify Solid and Hole in Shapes within a Polygon element (elm no 106)

Okay I have solved the problem by calculating the 2D area of each of the shapes. The one with the largest area must be the exterior :-)
But it would have been nicer if I could get the information from the element itself :-)

Hi,
the vba object model contains the property .IsHole, applicable to specific element types like shapes, ellipses, complex shapes and closed elements.

To give you an idea how to scan the elements within the active model, here a small vba example:

Sub HoleSolid()
Dim ee As ElementEnumerator
Set ee = ActiveModelReference.GraphicalElementCache.Scan
Do While ee.MoveNext
    Debug.Print ee.Current.Type
    Call CheckSubElements(ee.Current)
Loop
End Sub

Sub CheckSubElements(ele As element)
Dim ee As ElementEnumerator
If ele.IsComplexShapeElement Then
    If ele.AsComplexShapeElement.IsHole Then
        Debug.Print ele.FilePosition & " is hole"
    Else
        Debug.Print ele.FilePosition & " is solid"
    End If
Else
    If ele.IsComplexElement Then
        Set ee = ele.AsComplexElement.GetSubElements
        Do While ee.MoveNext
            Call CheckSubElements(ee.Current)
        Loop
    End If
End If
End Sub

This example works fine for complex structures represented as type 2 groups. 
Please post an example drawing file, if this doesn´t help in your case.
Best regards,
Artur 

Hi

Artur,

Thanks for your answer. Yes it is correct that in for instance in a GroupHole Cell-element, one can read the Solid flag.

But withthe new Polygon_Collection element this is not helping, because here all the shapes (simpel shapes or complex shapes) have the solid flag set to Solid , see the included illustation below. Note that the inner shape in the building has solid set to solid

The Polygon_collection element (elementType 106) is attached to the root feature and contains no geometry, since all the shapes in the Pollygon_collection are attached as subfeatures to the root feature containing the polygon element.

I have attached a small bit of technical map with some building on, so you can test. You need to open it in Bentley Map I Guess :-Exampel_Polygon_Collections.dgn

Hi

Artur,

Thanks for your answer. Yes it is correct that in for instance in a GroupHole Cell-element, one can read the Solid flag.

But withthe new Polygon_Collection element this is not helping, because here all the shapes (simpel shapes or complex shapes) have the solid flag set to Solid , see the included illustation below. Note that the inner shape in the building has solid set to solid

The Polygon_collection element (elementType 106) is attached to the root feature and contains no geometry, since all the shapes in the Pollygon_collection are attached as subfeatures to the root feature containing the polygon element.

I have attached a small bit of technical map with some building on, so you can test. You need to open it in Bentley Map I Guess :-Exampel_Polygon_Collections.dgn