RE: [OpenMap Users] Lat/Lon Visibility ?

Don,

You can fix that though if you test for when that occurs and then
forward project the negative x (lon) values by adding 360 to each x
value. Then the alogorithm works.

Martin

-----Original Message-----
From: Don Dietrick [mailto:dietrick@bbn.com]
Sent: Tuesday, March 02, 2004 12:57 PM
To: Sperlongano Brian M NPRI
Cc: openmap-users@bbn.com
Subject: Re: [OpenMap Users] Lat/Lon Visibility ?

Hi Brian,

You can do something like

boolean isVisible(Projection proj, float lat, float lon) {

        Point p = proj.forward(lat, lon);
        return
                p.getX() >=0 &&
                p.getX() < proj.getWidth() &&
                p.getY() >= 0 &&
                p.getY() < proj.getHeight();
}

  - Don

On Mar 2, 2004, at 2:33 PM, Sperlongano Brian M NPRI wrote:

>
> This is probably a really simple question, but is there a way to
> determine if a particular Lat/Lon is visible on a MapBean or
> Projection?
>
> Thanks,
> Brian
> --
> [To unsubscribe to this list send an email to "majdart@bbn.com" with
> the following text in the BODY of the message "unsubscribe
> openmap-users"]
>

--
[To unsubscribe to this list send an email to "majdart@bbn.com" with the
following text in the BODY of the message "unsubscribe openmap-users"]
--
[To unsubscribe to this list send an email to "majdart@bbn.com"
with the following text in the BODY of the message "unsubscribe openmap-users"]