Objekteigenschaften

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Introduction

Eine Eigenschaft ist ein Stück Information wie eine Zahl oder eine Zeichenkette, das mit einem FreeCAD-Dokument oder einem Objekt eines Dokuments verbunden ist. Eigenschaften können mit dem Eigenschaftseditor angezeigt und geändert werden.

Eigenschaften spielen in FreeCAD eine sehr wichtige Rolle, da es konstruiert wurde, um mit parametrischen Objekten zu arbeiten, die nur durch ihre Eigenschaften definiert werden.

All property types

Benutzerdefinierte geskriptete Objekte in FreeCAD können Eigenschaften der folgenden Typen besitzen:

Bool
Float
FloatList
FloatConstraint
Angle
Distance
ExpressionEngine
Integer
IntegerConstraint
Percent
Enumeration
IntegerList
String
StringList
Length
Link
LinkList
LinkSubList
Matrix
Vector
VectorList
VectorDistance
Placement
PlacementLink
PythonObject
Color
ColorList
Material
Path
File
FileIncluded
PartShape
FilletContour
Circle

Internally, the property name is prefixed with App::Property:

App::PropertyBool
App::PropertyFloat
App::PropertyFloatList
...

Remember that these are property types. A single object may have many properties of the same type, but with different names.

For example:

obj.addProperty("App::PropertyFloat", "Length")
obj.addProperty("App::PropertyFloat", "Width")
obj.addProperty("App::PropertyFloat", "Height")

This indicates an object with three properties of type "Float", named "Length", "Width", and "Height", respectively.

Scripting

See also: FreeCAD scripting basics

A scripted object is created first, and then properties are assigned.

obj = App.ActiveDocument.addObject("Part::Feature", "CustomObject")

obj.addProperty("App::PropertyFloat", "Velocity", "Parameter", "Body speed")
obj.addProperty("App::PropertyBool", "VelocityEnabled", "Parameter", "Enable body speed")

In general, Data properties are assigned by using the object's addProperty() method. On the other hand, View properties are normally provided automatically by the parent object from which the scripted object is derived.

For example:

  • Deriving from App::FeaturePython provides only 4 View properties: "Display Mode", "On Top When Selected", "Show In Tree", and "Visibility".
  • Deriving from Part::Feature provides 17 View properties: the previous four, plus "Angular Deflection", "Bounding Box", "Deviation", "Draw Style", "Lighting", "Line Color", "Line Width", "Point Color", "Point Size", "Selectable", "Selection Style", "Shape Color", and "Transparency".

Nevertheless, View properties can also be assigned using the view provider object's addProperty() method.

obj.ViewObject.addProperty("App::PropertyBool", "SupeVisibility", "Base", "Make the object glow")