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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def redraw(self, reset_camera=False):
 """ Redraw the render window. Args: reset_camera: Set to True to reset the camera to a pre-determined default for each structure. Defaults to False. """

        self.ren.RemoveAllViewProps()
        self.picker = None
        self.add_picker_fixed()
        self.helptxt_mapper = vtk.vtkTextMapper()
        tprops = self.helptxt_mapper.GetTextProperty()
        tprops.SetFontSize(14)
        tprops.SetFontFamilyToTimes()
        tprops.SetColor(0, 0, 0)

        if self.structure is not None:
            self.set_structure(self.structure, reset_camera)

        self.ren_win.Render()