[OpenLayers-Users] erase drawn features

[Mike Quentel]

Tim, thank you.

This seems to work well:

 function destroyDrawingLayer() {
   for(i = 0; i < map.layers.length; i++) { 
     var currentLayer = map.layers[i];
     if (currentLayer.isVector) {
       currentLayer.destroyFeatures();
     } //if (currentLayer...
   } // for (i = 0...
 } //function destroyDrawingLayer...

Mike Quentel

----- Original Message ----
From: Tim Schaub <noreply at geocartic.com>
To: users at openlayers.org
Sent: Friday, 6 April, 2007 10:59:56 AM
Subject: Re: [OpenLayers-Users] erase drawn features


Mike Quentel wrote:
> Please, advice on implementing functionality to erase all drawn features?

All drawn features are associated with a layer.  To remove features from 
a layer (which will also erase them), use:

     // given a vector layer and an array of features
     layer.removeFeatures(features);

To remove all features from a layer, you could use:

     layer.removeFeatures(layer.features);

Note that this is currently broken - and will be until the patch for 
#645 is in [1].

The layer.removeFeatures method doesn't actually destroy the features 
that you send it - so you could be leaking memory if you use this 
regularly.  If you want to actually get rid of all the features in a 
layer, use:

     // erase features and get rid of the evidence
     layer.destroyFeatures();

The one thing that is missing here is an eraseFeature or eraseFeatures 
method.  This would only temporarily erase the visual representation of 
the features - leaving them as part of the layer.features array. 
(Perhaps this will come with 2.5.)

Let me know if that doesn't answer your question.

Tim

[1] http://trac.openlayers.org/ticket/645

_______________________________________________
Users mailing list
Users at openlayers.org
http://openlayers.org/mailman/listinfo/users





		
___________________________________________________________ 
What kind of emailer are you? Find out today - get a free analysis of your email personality. Take the quiz at the Yahoo! Mail Championship. 
http://uk.rd.yahoo.com/evt=44106/*http://mail.yahoo.net/uk