check if a FreeCAD wire can be traversed

checkwire.py

import FreeCAD

def checkwire(w):
    """steps through every edge of a wire and checks the orientation"""
    pos=w.Vertexes[0].Point
    for i,e in enumerate(w.Edges):
         if e.Orientation == "Forward":
             vs=e.Vertexes
         else:
             vs=e.Vertexes[::-1]
     
         if (pos-vs[0].Point).Length<10E-6:
             pos = vs[-1].Point
         else:
             #print "discontinuity at start of Edge%d" % (i+1)
             #print e.Orientation,e.Curve
             #print [v.Point for v in e.Vertexes]
             #print e.Curve.value(e.FirstParameter),e.Curve.value(e.LastParameter)
             return False
    return True

if __name__ == '__main__':
    import FreeCADGui
    for obj in FreeCADGui.Selection.getSelection():
        for i,w in enumerate(obj.Shape.Wires):
            cont = checkwire(w)
            print '%s Wire%d %s' % (obj.Label, i+1,cont )
            if not cont:
                #retry sorted
                import Part
                import DraftGeomUtils
                sew=DraftGeomUtils.sortEdges([w.Wires])[0][0]
                print '%s Wire%d DraftGeomUtils.sortEdges %s' % (obj.Label, i+1,checkwire(sew) )
                import OpenSCAD2Dgeom
                fcew=Part.Wire(OpenSCAD2Dgeom.findConnectedEdges(w.Edges)[0])
                print '%s Wire%d OpenSCAD2Dgeom.findConnectedEdges %s' % (obj.Label, i+1,checkwire(fcew) )