Re: drawing arrows

Hi Donna,

If you are after formatted arrows, different line styles, thicknesses, etc.
I have some code which you could add to Not quite
sure if that is what you are after, I just thought I would let you know.

Cheers, Luke.

----- Original Message -----
From: "Donna L Gresh" <gresh@xxxxxxxxxx>
To: <visad-list@xxxxxxxxxxxxx>
Sent: Friday, August 08, 2003 4:39 AM
Subject: drawing arrows

> Is there a simple way to simply draw a set of arrows from one set of
> points to another? (my desire is to show the displacement of a set of
> points)
> I have set up a FlatField mapping (x,y) ->(u,v), where the (u,v)'s I've
> computed as the difference between x1,y1 and x2,y2. Thus I'd like to draw
> lines starting at points x,y with length u,v.
> I've tried constructing a scalarmap of u to Flow1X and v to Flow1Y, but
> nothing seems to appear in the display. It may well be that I'm still not
> doing things exactly as they should be, but is this the right approach?
> Donna L. Gresh, Ph.D.
> Optimization and Mathematical Software Group
> IBM T.J. Watson Research Center
> (914) 945-2472
> gresh@xxxxxxxxxx