[OpenLayers-Users] Vector layer and multiple symbolizers

[Xavier Mamano (jorix)]

Hi Yves,

Yes, oops!

On 'featuresremoved' must be clone the features... 
and to remove consider the original id oops!... 

I did not think this problem...

much work for the processor :(

Regards,

Xavier


Yves G wrote
> Hi again
> 
> apparently, using this strategy is not working because, sharing the
> features between the parent and slaves layers has side effects in the
> rendering process as you can see here
> http://jsfiddle.net/jLEYS/6/(comment/comment lines 68,69 to see what i
> d expect) :(
> 
> Regards
> Yves.
> 
> 
> 
> 2013/2/7 Yves Gillet <

> ygillet@

> >
> 
>> Hi Xavier
>>
>> thanks for your solution using other layers, I'll give it a try.
>> I thought about it also at a first place but I was afraid of the
>> performance overhead to have potentially 4 more layers (of about 1000
>> features each) to achieve that.
>> After digging in the source code, another (more complicated) solution
>> would have been to create a custom renderer which can create symbols
>> compositions,
>> for example in my case a svg renderer which could attach multiple child
>> nodes to the feature node rendered.
>> I havent yet figured how to do that, but maybe it could be a nice feature
>> for openlayers and I may experiment with it if I have more time :)
>>
>> Regards
>> Yves
>>
>>
>> 2013/2/6 Xavier Mamano (jorix) <

> xavier.mamano@

> >
>>
>> Hi Yves,
>>>
>>> It's not pretty, but could create a slave layer as:
>>>
>>> var mySlaveLayer = new OpenLayers.Layer.Vector("slave", {
>>>    displayInLayerSwitcher: false,
>>>    style: myOtherStyle
>>> });
>>> myLayer.events.on({
>>>     'featuresadded': function(evt) {
>>>         mySlaveLayer.addFeatures(evt.features.slice());
>>>     },
>>>     'featuresremoved': function(evt) {
>>>         mySlaveLayer.removeFeatures(evt.features.slice());
>>>     },
>>>     'visibilitychanged': ....
>>> });
>>>
>>> with two layers be sufficient, the numbers can be labels.
>>>
>>> You have a few hours of work for adjust this...
>>>
>>> Regards,
>>>
>>> Xavier Mamano
>>>
>>>
>>> Yves G wrote
>>> > Hi there,
>>> > thanks for your input.
>>> >
>>> > But if you look my image mockup of what I m trying to display , I want
>>> to
>>> > style the station along with some of its attributes (sort of symbols
>>> > composition, not just the point one) .
>>> > I'd be glad if you could update my example here
>>> > http://jsfiddle.net/jLEYS/3/ to
>>> > show me how I could achieve that using the StyleMap
>>> >
>>> > Regards,
>>> > Yves
>>> >
>>> >
>>> >
>>> > 2013/2/5 Sergeant_york <
>>>
>>> > electronicpanda@
>>>
>>> > >
>>> >
>>> >> var style = new OpenLayers.Style({
>>> >>     externalGraphic: '${graphicFunction}',
>>> >>      graphicYOffset: '${graphicYOffsetFunction}',
>>> >>      graphicXOffset: '${graphicXOffsetFunction}',
>>> >>     /* etc... */
>>> >> }, {
>>> >>     context: {
>>> >>         graphicFunction: function(feature) {
>>> >>             if(feature.attributes.type=='bike') return '/bike.png';
>>> >>             else if(feature.attributes.type=='hospital') return
>>> >> '/hospital.png';
>>> >>             /*etc...*/
>>> >>         },
>>> >>         graphicYOffsetFunction: function(feature){
>>> >>             if(feature.attributes.type=='bike') return 10;
>>> >>             else if(feature.attributes.type=='hospital') return -10;
>>> >>             /*etc...*/
>>> >>         }, /*etc...*/
>>> >>     }
>>> >> });
>>> >>
>>> >>
>>> >>
>>> >> --
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