[GeoJSON] FW: [ol3-dev] Accessing features

[Worth Lutz]

I've been following discussion on this list and saw the following on the
OpenLayers 3 dev list. See paragraph starting with "Zoom to dataExtent".

 

It seems that there the idea is that the projection should be included in
the data.  How does this impact the discussion of projection on this list?

 

Worth Lutz

 

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From: OL3 Dev on behalf of Peter Robins [mailto:ol3-dev at googlegroups.com] On
Behalf Of Peter Robins via OL3 Dev
Sent: Wednesday, July 10, 2013 11:42 AM
To: ol3-dev at googlegroups.com
Subject: Re: [ol3-dev] Accessing features

 

On Tuesday, July 9, 2013 2:51:57 PM UTC+1, Andreas Hocevar wrote:


Having said that, for now the way to access your features is the map's 
getFeatures method. I expect this to stay and become part of the API. 

 

I noticed that function but it seems to be limited to a pixel, and I
couldn't see how you would use it to fetch all features on a layer 

 

Regarding getDataExtent, I don't see a reason why this should not be 
added, but so far there was no need for it

 

Zoom to dataExtent is one of my most common use cases. When the developer
determines the vector source, then s/he will also know where to position the
map/view. But if the user determines it ("that gpx file I created this
morning"), then the developer has no way of knowing. The same applies in
principle to projection - how should I know what projection their data is
in? In practice, I often do, as the "gpx file created this morning" will be
in 4326. As the comment in the wiki page says, the projection should be in
the data; the developer shouldn't have to specify this (and might not know).

 

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