LinkSubList/de
Beschreibung
Ein LinkSubList-Objekt ist eine Datenstruktur, die als Eingabe für verschiedene Funktionen und Objekte verwendet wird; seine Aufgabe ist es ein Unterobjekt oder Unterelement (Knoten, Kante, oder Fläche) von einem Objekt an ein anderes Objekt zu übergeben, das diese Geometrie verwendet oder verändert.
Ein LinkSubList-Objekt besteht aus einer Liste von Tupeln.
sublist = [tuple1, tuple2, tuple3, ...]
Each tuple contains at least two elements; the first element is a reference to a document object, and the second element is a text string indicating the internal name of the subelement. This name has a number starting with one, and up to the total number of those subelements.
tuple1 = (obj1, "Vertex1")
tuple2 = (obj2, "Face1")
tuple3 = (obj3, "Edge1")
The second element of the tuple can itself be a list of strings, indicating various subelements of the same document object.
tuple1 = (obj1, ["Vertex1", "Vertex2"])
tuple2 = (obj2, ["Face1", "Face3", "Face5"])
tuple3 = (obj3, ["Vertex1", "Face5", "Edge1", "Edge2"])
It is possible to see that a LinkSubList is a list of LinkSub structures. Each tuple is in fact a LinkSub.
Skripten
Siehe auch: FreeCAD Grundlagen Skripten.
A new scripted object can accept a LinkSubList by adding the corresponding property.
It is important to recompute the objects before their subelements are used as input for other objects, otherwise an error may be produced as the geometry may not contain a valid Shape.
doc = App.newDocument()
cube = doc.addObject("Part::Box", "Cube")
cyl = doc.addObject("Part::Cylinder", "Cylinder")
doc.recompute()
new_obj = doc.addObject("App::FeaturePython", "New")
new_obj.addProperty("App::PropertyLinkSubList", "Geometry")
new_obj.Geometry = [(cube, ["Vertex1", "Vertex2"]),
(cyl, "Edge1")]
doc.recompute()
The subelement can then be extracted from the assigned property, and can be manipulated to do something.
>>> new_obj.Geometry
[(<Part::PartFeature>, ('Vertex1', 'Vertex2')), (<Part::PartFeature>, ('Edge1',))]
>>> new_obj.Geometry[0]
(<Part::PartFeature>, ('Vertex1', 'Vertex2'))
>>> new_obj.Geometry[0][1]
('Vertex1', 'Vertex2')
>>> new_obj.Geometry[0][1][1]
'Vertex2'
>>> new_obj.Geometry[0][1][1].strip("Vertex")
'2'
>>> int(new_obj.Geometry[0][1][1].strip("Vertex"))
2
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