wn_text_rotation(_c)

	status.i4.v = wn_text_rotation(rotation.i4.r)

	status.i4.v = wn_text_rotation_c(rotation.i4.v)

	This routine sets the current text rotation for graphical windows.

	rotation	text rotation
			(WN_TEXT_LEFT_TO_RIGHT -> normal left to right text,
			 WN_TEXT_UP -> bottom to top text,
			 WN_TEXT_DOWN -> top to bottom text,
			 WN_TEXT_RIGHT_TO_LEFT -> right to left upside down,
			 CLIB_DEFAULT_ARG -> simply return the present
					     text rotation)

	This function returns status values as follows:

	CBS_INVARG		invalid text rotation
	otherwise		previous text rotation setting

	This function requires the following include files:

	clib_h, cbslib_h, acnet_errors_h

	Related functions:

	wn_text(_c), wn_colored_text_c, wn_display_value(_c),
	wn_external_text(_c), wn_external_colored_text_c,
	wn_external_display_value_c, wn_text_size(_c), wn_text_attributes_c,
	intro_graphics_windows

	C/C++ usage:

	int	status;
	int	rotation = WN_TEXT_LEFT_TO_RIGHT;

	status = wn_text_rotation_c(rotation);