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Description

Simple example animation Draft wires by use the expressions for associate many wires and simulate or verify the movement. Here the circle rotation create the movement for all objects connected

Animation use the constraint expression

Uses

Download the file example Constraint_Draft00.FCStd, open it in FreeCAD

Script

Select the Line005_with_Code object in the Combo View Select Data tab → Memo code → Code for rotation → ... (This macro run with FreeCAD version 16 )

Select the complete code and paste in the Python Console

(If do not have the Python console: Menu → View → Panels → select Python console)

How to copy the code snippet

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Macro_Constraint_Draft.FCMacro

# Copy and pate this snippet in the FreeCAD console Python 
# mario52 19/04/2017

import FreeCADGui
import FreeCAD

#FreeCAD.Console.PrintMessage(str(FreeCAD.Version()) + "\n")
if int(FreeCAD.Version()[1]) == 16:    # Version de FreeCAD
    try:
        for i in range(0,360,5):
            App.getDocument("Constraint_Draft00").Circle.Placement=App.Placement(App.Vector(0,0,0), App.Rotation(i,0,0), App.Vector(0,0,0))
            FreeCADGui.updateGui()
            FreeCAD.ActiveDocument.recompute()
    except Exception:
        FreeCAD.Console.PrintMessage("You must download the Constraint_Draft00.FCStd file for run this macro" + "\n")
        import webbrowser 
        webbrowser.open("https://forum.freecad.org/download/file.php?id=36559")

else:
    FreeCAD.Console.PrintError("This macro run with the FreeCAD.Version 16 " + "\n")

Rotation with FreeCAD tools

Link

The forum discussion Sketch Feature to create linkage mechanism simulator