[Chameleon] zoomscale

[John Pulles]

Hi list,

It seems a (modified) Locate widget does not do an accurate zoom to 
scale. We modified the Locate widget to zoom to a scale of 50000 and 
noticed that the centre of the map was not close to the requested 
location. Looking into the code (at the end of the parseUrl function of 
the Locate widget) the problem seems that first the pixel coordinates 
are calculated based on the full (?) extent of the map; after this the 
zoom function is called.
I am not sure if I fully comprehend the code, but it seems more logical 
to me if the zoom function would use map/world coordinates instead of 
pixels, or else calculate the pixel coordinates after the zoom-to-scale 
has been done.
The workaround seems to be to use the MapNavigator->recentre function 
after having recalculated the pixel coordinates with the extent 
after-the-zoomin. Is this the correct way, or should something else be done?

Regards,
John.

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E-mail: john.pulles@geodan.nl
Website: http://www.geodan.nl
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