NCL Website header
NCL Home > Documentation > Functions > Graphics routines

tdgrid

Draws a grid on a particular face of a box in 3-space (for use with selected TDPACK routines).

Available in version 4.3.1 and later.

Prototype

	procedure tdgrid (
		wks       [1] : graphic,  
		xbegin    [1] : float,    
		xstep     [1] : float,    
		nx        [1] : integer,  
		ybegin    [1] : float,    
		ystep     [1] : float,    
		ny        [1] : integer,  
		grid_flag [1] : integer   
	)

Arguments

wks

An NCL workstation identifier for where you want to draw the surface. The wks identifier is one returned either from calling gsn_open_wks or calling create to create a Workstation object.

xbegin
xstep
nx

xbegin and xstep are float scalars that define where ticks or grid lines are to be drawn along the X axis of the parallelogram. nx indicates how many ticks/lines to draw (xbegin, xbegin+xstep, xbegin+2*xstep, ... xbegin+(nx-1)*xstep).

ybegin
ystep
ny

ybegin and ystep are float scalars that define where ticks or grid lines are to be drawn along the Y axis of the parallelogram. ny indicates how many ticks/lines to draw (ybegin, ybegin+ystep, ybegin+2*ystep, ... ybegin+(ny-1)*ystep).

grid_flag

Integer flag that defines what is to be drawn: 1 (draw just a perimeter), 2 (draw a perimeter with inward-pointing ticks), or 3 (draw a perimeter with a grid).

Description

This routine is part of the low-level TDPACK package, which is a group of Fortran and C callable routines for projecting objects from a 3-dimensional coordinate system having U, V, and W axes to a 2-dimensional projection plane having X and Y axes and/or for drawing the projections of those objects. This can be referred to somewhat loosely as "drawing objects in three dimensions".

This procedure draws a perimeter, optionally with ticks or grid lines, around the edges of the reference parallelogram defined by the last call to tdpara. This routine is normally called indirectly (by virtue of a call to tdgrds), but there is no reason why it should not be called directly.

Please see the documentation on TDGRID for a full description of this procedure.

See Also

Initialization routines: tdinit, tdpara, tdclrs

Parameter access routines: tdgetp, tdgtrs, tdsetp, tdstrs

Point transforming routines: tdprpt, tdprpa, tdprpi

Line drawing routines: tdline, tdlndp, tdlnpa, tdlpdp, tdcurv, tdcudp

Grid drawing routines: tdgrds

Label drawing routines: tdlbls, tdlbla, tdlblp, tdplch

Surface drawing routines: tddtri, tdstri, tditri, tdmtri, tdttri, tdctri, tdotri, tdsort

Simplified interface routines: tdez2d, tdez3d

Examples

No examples for this routine are available at this time.