[Mapserver-users] Mapplet - show x/y coordinates on moving

[Tom.Kralidis at CCRS.NRCan.gc.ca]

> -----Original Message-----
> From: Eduardo Patto Kanegae [mailto:eduardo at linkgeo.com.br]
> Sent: Monday, May 05, 2003 1:31 PM
> To: Mapserver List
> Subject: [Mapserver-users] Mapplet - show x/y coordinates on moving
> 
> 
> I've that Mapplet has a 'verbose' param that makes the applet 
> return the current x/y mouse position in image 
> coordinates.
> 

You can check out:

http://www.kralidis.ca/gis/mapserv/mapplet/howto.htm


> Does anybody has a function to transformate it to geographic 
> coordinates?
> 

Something like this works in JavaScript, although it has problems
recognizing hemispheres.

 xval = Number([minx] + (x * (Math.abs([minx]) - Math.abs(([maxx]))) /
[mapwidth]));
 yval = Number([maxy] - (y * (Math.abs([maxy]) - Math.abs(([miny]))) /
[mapheight]));

I think there is a more robust formula in the MapServer code.

..Tom

=================================
Tom Kralidis
Systems Scientist
Canada Centre for Remote Sensing
Tel: +01-613-947-1828
http://www.cgdi.ca/
=================================

> tks
> 
> mapplet_mouse_moved
> 
> Eduardo Patto Kanegae
> Consultor GeoTI / GeoIT Consultant
> eduardo at linkgeo.com.br
> http://www.linkgeo.com.br
> LinkGEO - Geoprocessamento & Webmapping / LinkGEO - 
> Geoprocessing & Webmapping
> 
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