FreeCAD Macro to convert a wire into a piecevise Bezier curve

wire2bez.py

import FreeCAD

def segments2points(segments,degree):
    pts=segments[0].getPoles()[0:1]
    for seg in segments:
        if seg.Degree < degree:
            seg.Increase(degree)
        pts.extend(seg.getPoles()[1:])
    return pts
 
def partwire2draftbezcurve(wire,degree=3,label=None):
    points=[wire.Vertexes[0].Point]
    for edge in wire.Edges:
        curve=edge.Curve
        if not isinstance(curve,Part.BezierCurve) or curve.Degree>degree:
            print 'approimate'
            if not isinstance(curve,Part.BSplineCurve):
                curve=curve.toBSpline()
            if curve.Degree<degree:
                curve.increaseDegree(degree)
            if curve.Degree==degree:
                seglst = curve.toBezier()
            else:
                seglst = curve.approximateBSpline(0.05,20, 3,'C0').toBezier()
            points.extend(segments2points( seglst,degree)[1:])                  
        else:
            print 'isbezier',curve.Degree
            if curve.Degree<degree:
                curve.Increase(degree)
            if curve.Degree==degree:
                points.extend(curve.getPoles()[1:])
            else:
                raise ValueError
    if (len(points) > 3) and (points[0]==points[-1]):
        points.pop()
        closed=True
    else:
        closed=False
    import Draft
    do=Draft.makeBezCurve(points,closed=closed,support=None,Degree=degree)
    if label:
        do.Label='Bez%s'%label

if __name__ == '__main__':
    import FreeCADGui
    for obj in FreeCADGui.Selection.getSelection():
        wires = obj.Shape.Wires if obj.Shape.ShapeType != 'Edge' else [PartEdge(obj.Shape)]
        for wire in wires:
            partwire2draftbezcurve(wire,label=obj.Label)