[OpenLayers-Dev] Markers and Vector Layer conflict

[Alex G.]

Alexandre,

thanks again for your help.

The event is not triggered with the code you posted so I changed a few
things around, though it's probably not the best way to do this, and it
seems to be triggered:


             var oDrawPoint = new OpenLayers.Control.DrawFeature(vectors,
OpenLayers.Handler.Point);
             vectors.events.on({'
featureadded': onPointFeatureAdded, 'scope': oDrawPoint });

             function onPointFeatureAdded (event) {
                 var feature = event.feature;
                 if (feature.geometry.CLASS_NAME ==
'OpenLayers.Geometry.Point') {

                  var symbolizer =
feature.layer.styleMap.createSymbolizer(feature);

                  feature.style = symbolizer;
                  feature.style.externalGraphic =
\"images/markers/marker-gold.png\";
                  feature.style.pointRadius = 13;
                  feature.style.fillOpacity = 1;
                  feature.layer.drawFeature(feature);
                 }
              }

Though that if statement there must be surely incorrect but I wasn't able to
trigger the event of a point added any other way.

On to figuring out the different images now!

Thanks,

Alex


On Fri, Feb 5, 2010 at 3:34 PM, Alexandre Dube <adube at mapgears.com> wrote:

> Alex,
>
>  Instead of defining the externalGraphic property directly in your StyleMap
> (that affects all your features on your layer), you could register a
> "featureadded" event to your DrawFeature control for points and set the
> externalGraphic property there.  You would need to redraw your feature to
> affect the new style.  This might look like (untested) :
>
>  var oDrawPoint = new OpenLayers.Control.DrawFeature(vectors,
> OpenLayers.Handler.Point);
>  oDrawPoint.events.on({"featureadded": onPointFeatureAdded, scope:
> oDrawPoint});
>
>  var onPointFeatureAdded = function(event) {
>       var feature = event.feature;
>       var symbolizer = this.layer.styleMap.createSymbolizer(feature);
>       feature.style = symbolizer;
>       feature.style.externalGraphic = "images/markers/marker-gold.png";
>       feature.style.pointRadius = 10;
>       this.layer.drawFeature(feature);
>   };
>
>   The remaining thing to do is to think about how to have different markers
> for your features.
>
> Hope this helps,
>
> Alexandre
>
>
>
> Alex G. wrote:
>
>> Alexandre,
>>
>> thanks again for your valuable help!
>>
>> At the moment the best idea would be to have vector points as markers,
>> which would make them both clickable and perfect for what I need to do.
>>
>> I have added this info to the vector layer:
>>
>>            vectors = new OpenLayers.Layer.Vector('Vectors', {
>>                styleMap: new OpenLayers.StyleMap({
>>                    externalGraphic: "images/markers/marker-gold.png",
>>                    pointRadius: 10
>>                })
>>            });
>>
>> And the point appears correctly with the marker icon. But I have run into
>> 2 problems now:
>>
>> 1) All my polygons and lines appear black or invisible
>> 2) I would like to use more than one image for the markers
>>
>> My controls looks like this:
>>
>>            controls = {
>>                point: new OpenLayers.Control.DrawFeature(vectors,
>>                            OpenLayers.Handler.Point),
>>                line: new OpenLayers.Control.DrawFeature(vectors,
>>                            OpenLayers.Handler.Path),
>>                polygon: new OpenLayers.Control.DrawFeature(vectors,
>>                            OpenLayers.Handler.Polygon),
>>                drag: new OpenLayers.Control.DragFeature(vectors),
>>                select: selectControl
>>            };
>>
>> Is there a way to maybe pass the external image specifically to the
>> "point" control?
>>
>> I am unsure about the syntax and I wasn't able to find any info around,
>> maybe something like this:
>>
>> point: new OpenLayers.Control.DrawFeature(vectors,
>>                            OpenLayers.Handler.Point, {style: blah blah}),
>>
>> If it's possible, then that solves my 2nd problem as well for different
>> images.
>>
>> Thanks in advance!
>>
>> Best regards,
>>
>> Alex
>>
>>
>
> --
> Alexandre Dubé
> Mapgears
> www.mapgears.com
>
>
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