[OpenLayers-Users] mouse-line offset with Google maps

[Christopher Schmidt]

On Mon, Mar 09, 2009 at 04:29:21PM +0100, Erwin Poeze wrote:
> Hello,
> 
> I'm new to OpenLayer but I have programming experience with the Google
> Maps API. I like the fact that OpenLayers is independent of the 'map
> provider' and I am considering to continue programming in OpenLayers.
> 
> I ran into a problem that I'm unable to solve. I examined the example
> draw-feature.html and replace the map by the Google version, see the
> few line below.
> 
> [code]
>                map = new OpenLayers.Map('map',{
>                  projection: new OpenLayers.Projection("EPSG:900913"),
>                  displayProjection: new OpenLayers.Projection("EPSG:4326")
>                });
> 
>                var gphy = new OpenLayers.Layer.Google(
>                        "Google Physical",
>                        {type: G_PHYSICAL_MAP},
>                        {'sphericalMercator': true,
>                            'maxExtent': new
> OpenLayers.Bounds(-20037508.34,-20037508.34,20037508.34,20037508.34)
>                        
                   These are wrong.

Instead:

                       {type: G_PHYSICAL_MAP,
                       'sphericalMercator': true,
                           'maxExtent': new
OpenLayers.Bounds(-20037508.34,-20037508.34,20037508.34,20037508.34)
}
                 );

-- Chris

> [/code]
> 
> The example continuous to work, but now I get a vertical offset
> between the mouse position and the line drawn. I attached a small
> picture to illustrate this. The offset is not constant. Drawing at the
> top of the map results in a offset of nearly zero and the offset is
> maximal when drawing a line at the bottom.
> 
> I read the documentation and tried to play around with the projection,
> but I can not imagine that the projection is causing this issue.
> 
> Does anyone have any idea what kind of phenomenon this is, and more
> important, how I can solve this?
> 
> Thank you very much,
> 
> Erwin
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-- 
Christopher Schmidt
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