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 SetIsotropicMode   Set the Isotropic mode.
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 Syntax:            <oPrn>:SetIsotropicMode()  --> <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
                    equally scaled axes; that is, one unit along the x-axis
                    is equal to one unit along the y-axis. The SetWindowExt
                    and SetViewportExt functions must be used to specify the
                    desired units and the orientation of the axes. GDI makes
                    adjustments as necessary to ensure that the x and y units
                    remain the same size.