[OpenLayers-Users] Strange behaviour after panning

[Pedro Simonetti]

After some investigations, I found how to fix it.

I've changed the piece of the code where it calculates the coordinates,
from:

  var lonlat = map.getLonLatFromLayerPx(evt.xy);

To:

  var lonlat = map.getLonLatFromViewPortPx(evt.xy);

Now it works fine. 

I'm just wondering, what's the difference of "getLonLatFromLayerPx", and
"getLonLatFromViewPortPx"? I've looked at the docs but I still don't get it.
At first glance, I thought that these methods were similars.

my best regards,

Pedro Simonetti.


Pedro Simonetti wrote:
> 
> Dear developers,
> 
> I'm trying to develop a query feature in my project, but I'm getting a
> strange behaviour. I'm using 2 kaMap layers, one raster satellite image,
> and one vector shape file.
> 
> Please visit:
> 
> http://189.52.176.118:8080/teste/?zoom=5&lat=7756661.87151&lon=364887.48481&layers=BT
> 
> Then click in the map inside the polygon named "Jardim da Penha". Note
> that the query will result the right response, showing the text "Jardim da
> Penha" in the lower right corner of the screen.
> 
> But, then, click and drag, moving the mouse to the right. And then click
> on another polygon, for example, the named "Itarare". The result will be
> wrong. Here I got "Jardim da Penha", but clicking in other areas you will
> got different results.
> 
> It seems when you pan the map, it looses the correct coordinates. It's
> like the "map.getLonLatFromLayerPx" still thinking it is in the same
> coordinates that before panning.
> 
> What I'm doing wrong??
> 
> I have limited english skills, so if my message isn't clear enought,
> please ask me about specific details.
> 
> I'm using the 2.6 RC1. I'm making the query through PHP mapscript.
> 
> NOTE: The images i'm using are very big, and my development server is
> kinda slow. So, if the images don't load properly, please press F5, and
> they should appear.
> 
> regards,
> 
> Pedro.
> 
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