status.i4.v = wn_color(color.i4.r)

	status.i4.v = wn_color_c(color.i4.v)

	This routine sets the drawing color for future graphics calls using
	the "wn_xxxx" routines.

	color		drawing color (constants are in 'cnsparam')
			(If a value of CLIB_DEFAULT_ARG is passed for this
			argument, the present color will simply be returned
			to the caller.)

	This function returns status values as follows:

	CBS_INVARG		invalid color
	otherwise		previous drawing color

	This function requires the following include files:

	cnsparam_h, cbslib_h, acnet_errors_h

	Related functions:

	wn_user_defined_color_c, wn_read_user_defined_color, wn_box(_c),
	wn_circle(_c), wn_vector(_c), wn_text(_c), wn_point(_c),
	wn_circular_arc_c, wn_display_value(_c), intro_graphics_windows

	C/C++ usage:

	int	status;
	int	color = GREEN;

	status = wn_color_c(color);