Macro TNP Solution

Solution description
This is solution for Topological Naming Problem described at: Topological Naming Problem

If you build object at another object, and also with Sketch it is straightforward to solve, because you know two things:


 * 1) Points from Sketch is always part of the face below
 * 2) The Sketch and the face below are in the same plane

To solve Topological Naming Problem problem you can:

Store the key before any operation:

You need only store the key before any operation. For this example described at Topological Naming Problem page the object is at XY plane. So, I use Z axis value from Sketch BoundBox center:

Next search all faces for the stored key:

After the resize I search all faces for the stored key. Because if the Sketch and Face were at the same plane XY. The Z axis value was the same for both. At the PartDesign you cannot move 3rd Pad above the 2nd Pad, to have gap between, this is single object, the next Pad with the Sketch always will be touching the face. At the new face the Z axis value always will be the same with the stored key. So, return the face index. Nothing more to be done.

Final steps

At the end I assign the new face to the Sketch and recompute. To be honest, the most difficult part was to assign the face to Sketch.Support, for me the syntax is mind-blowing ;-)

Summary

In this example the plane is XY, but you can do exactly the same for other axes. Also you can choose other key. The same you can do for edges at Chamfer or Fillets. This is already solved at Woodworking project and is already available in its library.

File for testing has been uploaded at FreeCAD forum: TNP.FCStd. However, this example is not important. The Topological Naming Problem page describe in details how to create such example. One thing I added there is Constraint to be able to resize the Pad from script. This solution show how to approach the Topological Naming Problem. There are many such problems when programming in FreeCAD, but they can all be solved in a similar way.