[OpenLayers-Users] Vector layer and multiple symbolizers

[Yves Gillet]

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 at gmail.com>

> 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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> >>
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