[OpenLayers-Users] Re: Handler.Box units

[Puneet Kishor]

On Nov 2, 2011, at 5:54 PM, Robert Sanson wrote:

> Where is your bounds coming from?


Its coming from the code I gave below (pretty much the exact code I am using, lifted from the docs). See my original post.

> I would expect bounds to be in terms of your map projection. Whereas map.getLonLatFromPixel is used to convert a pixel location to a map coordinate.
> 

Indeed, that is what I expected as well, which is why I was converting from google projection (my map display projection) to lat lng (the projection I want the coordinates in). Except, much to my surprise I discovered that bounds was returning pixels. Hence, my attempt to convert those pixels to lat lng directly, which failed as well.


> Regards,
> 
> Robert
> 
>>>> Puneet Kishor <punk.kish at gmail.com> 3/11/2011 11:46 a.m. >>>
> 
> On Nov 2, 2011, at 4:37 PM, Puneet Kishor wrote:
> 
>> I am reusing the sample code from the Handler.Box documentation
>> 
>> var control = new OpenLayers.Control();
>> OpenLayers.Util.extend(control, {
>> draw: function () {
>> // this Handler.Box will intercept the shift-mousedown
>> // before Control.MouseDefault gets to see it
>> this.box = new OpenLayers.Handler.Box(
>> control,
>> {done: this.notice},
>> {keyMask: OpenLayers.Handler.MOD_SHIFT}
>> );
>> this.box.activate();
>> },
>> 
>> notice: function (bounds) {
>> OpenLayers.Console.userError("bounds: " + bounds);
>> var bbox = bounds.transform(proj.google, proj.latlng).toBBOX();
>> OpenLayers.Console.userError("bbox: " + bbox);
>> }
>> });
>> 
> 
> I am doing something wrong here trying to convert pixels to lat lng
> 
> var bbox = bounds.toArray();
> var p1 = map.getLonLatFromPixel(bbox[0]);
> var str  = "Lat: " + p1.lat + " (Pixel.x:" + p1.x + ") Lon: " + p1.lon + " (Pixel.y:" + p1.y + ")\n";
> alert(str);
> 
> produces the following alert
> 
> Lat: NaN (Pixel.x:undefined) Lon: NaN (Pixel.y:undefined)
> 
> 
> --
> Puneet Kishor_______________________________________________
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