FUNCTION vu_vox_drawhlatitude, F, lat,cntr,dvox, obj_val
;+
; NAME:
;	vu_vox_drawhlatitude
; PURPOSE:
;	Internal use by vu_vox_showheliogrid only
; CATEGORY:
;	Volume Pro board
; INCLUDE:
	@compile_opt.pro		; On error, return to caller
; CALLS:
;	gridgen
; CALLED BY:
;	vu_vox_showHelioGrid
; MODIFICATION HISTORY:
;	JUL-2002, Cindy Wang xin_wang02@hotmail.com
;-
n = 360
P = gridgen(n, range=-n/2+[0,n-1])

P=replicate(1,3)#P
;P[0,*]:longitude P[1,*]:latitude P[2,*]:radius

P[1,*] = lat
P[2,*] = 1

P = cv_coord(from_sphere=P, /to_rect, /degree)

P = round( cntr+P*dvox )

F[P[0,*], P[1,*], P[2,*]] = obj_val

RETURN, F  &  END