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 SetAnisotropicMode Set the anisotropic mode.
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 Syntax:            <oPrn>:SetAnisotropicMode()  --> <nPrevMapMode>


 Parameters:        None

 Returns:           A numeric value indicating the previous map mode
                    if this operation was successful.

 Comments:          Logical units are converted to arbitrary units with
                    arbitrarily scaled axes. Setting the mapping mode to
                    MM_ANISOTROPIC does not change the current window or
                    viewport settings. To change the units, orientation,
                    and scaling, an application should use the SetWindowExt
                    and SetViewportExt functions.