[OpenLayers-Dev] Advice on best way to extend a OL class.

[Phil Scadden]

>   The "Strategy Cluster Extended" would be a good class extending 
> example :
>
> http://openlayers.org/dev/examples/strategy-cluster-extended.html 
Thanks for that. Still got a javascript issue though.

Suppose I extend linearRing with the swapXY method - call it linearRingEx.

The code calling context though is:
                             } else if (filter.type === 
OpenLayers.Filter.Spatial.INTERSECTS) {
                                 var geom = filter.value;
                                 transformGeometry(geom);
                                 geom.components[0].swapXY();
                                 params.cql_filter = 'INTERSECTS(SHAPE,' 
+ geom.toString() + ')';

To call the swapXY method, I need to somehow cast the geom object (a 
superclass) so that the linearRing descendent is of linearRingEx. I am 
struggling to see how to do this in JS.


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