<summary>
Set paragraph flow direction.
</summary>
<param name="flowDirection">Paragraph flow direction</param>
<returns>
Standard HRESULT error code.
</returns>
<remarks>
The flow direction must be perpendicular to the reading direction.
Setting both to a vertical direction or both to horizontal yields
DWRITE_E_FLOWDIRECTIONCONFLICTS when calling GetMetrics or Draw.
</remark>
<summary> Set paragraph flow direction. </summary> <param name="flowDirection">Paragraph flow direction</param> <returns> Standard HRESULT error code. </returns> <remarks> The flow direction must be perpendicular to the reading direction. Setting both to a vertical direction or both to horizontal yields DWRITE_E_FLOWDIRECTIONCONFLICTS when calling GetMetrics or Draw. </remark>