On Tue, Mar 8, 2011 at 12:07 PM, Leigh Holcombe
<[email protected]> wrote:
> On Mar 7, 2011, at 7:39 PM, Eric Lemoine wrote:
>
>> On Monday, March 7, 2011, Leigh Holcombe <[email protected]> wrote:
>>> Greetings,
>>>
>>> I have a layer constructed from a GeoJSON file, using the following code:
>>> var trail1 = new OpenLayers.Layer.Vector("Kaau Crater", {strategies: [new
>>> OpenLayers.Strategy.Fixed()], protocol: new OpenLayers.Protocol.HTTP({url:
>>> "kaaucrater-rb.json", format: new OpenLayers.Format.GeoJSON()}), styleMap:
>>> styles, projection: utm4n});
>>>
>>> What I'd like to do is get the bounds or centerpoint of the GeoJSON file
>>> automatically, perhaps by using something like getBounds or
>>> getCenterLonLat, but my newb mind is discovering that I can't perform these
>>> operations on the layer object I have created. I suspect I need to also
>>> create a geometry layer from the GeoJSON file, but I am not sure how to do
>>> that. Can anyone provide any direction?
>>
>> Hi. The Vector layer has a getDataExtent method, that you can call
>> when the features have been added to the layer:
>>
>> trail1.events.on({"loadend": function() {
>> var bounds = trail1.getDataExtent();
>> }});
>>
>> --
>> Eric Lemoine
>>
>
> Thank you, that works very well. However, it's a little too late in the
> process. My plan is to use the bounds/extent to calculate the center of the
> overlay, and then pass that to map.setCenter. Is there a way to make this
> happen before the loadend?
What about
trail1.events.on({"loadend": function() {
map.zoomToExtent(trail1.getDataExtent());
}});
?
>
> Additionally, where can I find a complete list of the standard events, such
> as loadstart and loadend?
For example, layer events are documented here:
<http://dev.openlayers.org/releases/OpenLayers-2.10/doc/apidocs/files/OpenLayers/Layer-js.html#OpenLayers.Layer.EVENT_TYPES>
--
Eric Lemoine
Camptocamp France SAS
Savoie Technolac, BP 352
73377 Le Bourget du Lac, Cedex
Tel : 00 33 4 79 44 44 96
Mail : [email protected]
http://www.camptocamp.com
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