Heidtmare is right and faster than me.... :D
Here is a script working
var map, wfs;
var styleMap1 = new OpenLayers.StyleMap({
"default": new OpenLayers.Style(
{
fillColor: "#0000FF",
strokeColor: "#0000FF",
pointRadius: 6
}
)
});
function init(){
map = new OpenLayers.Map('map');
var wms = new OpenLayers.Layer.WMS(
"OpenLayers WMS",
"http://labs.metacarta.com/wms/vmap0?";,
{layers: 'basic'}
);
map.addLayer(wms);
map.zoomToMaxExtent();
var strat = new
OpenLayers.Strategy.Cluster({distance:20});
vectorLayer = new OpenLayers.Layer.Vector("Vektorlayer",{
strategies: [
strat
],
styleMap: styleMap1, maxResolution: 19});
strat.activate();
map.addLayers([vectorLayer]);
/**
* Generate datas // Simulate your data access
*/
var dx = 3;
var dy = 3;
var px, py;
featuresToBeClustered = [];
for(var x=-45; x<=45; x+=dx) {
for(var y=-22.5; y<=22.5; y+=dy) {
px = x + (2 * dx * (Math.random() - 0.5));
py = y + (2 * dy * (Math.random() - 0.5));
featuresToBeClustered.push({
'lonlat':new
OpenLayers.LonLat(px,py),
'id':px+' '+py
});
}
}
/**
* Populate the array of feature
*/
var arrayOfFeatures = [];
for (var i=0; i<featuresToBeClustered.length; i++){
arrayOfFeatures.push(generateFeature(vectorLayer,
featuresToBeClustered[i].lonlat, featuresToBeClustered[i].id));
}
/**
* Add all features in one time
*/
vectorLayer.addFeatures(arrayOfFeatures);
map.setCenter(new OpenLayers.LonLat(0, 0), 2);
}
/**
* Modification of you function
*/
function generateFeature(layer, lonlat, mestId){
var geometryObjekt = new
OpenLayers.Geometry.Point(lonlat.lon,lonlat.lat);
var vectorObjekt = new
OpenLayers.Feature.Vector(geometryObjekt);
vectorObjekt.attributes.mest = mestId;
return vectorObjekt;
}
Heidtmare wrote:
>
> i believe you need to add all your features at once,
> so instead of looping the layer.addFeatures() call
> you need to build all your features into an array and then call
> layer.addFeatures() once.
>
>
> -----Original Message-----
> From: [email protected] on behalf of Shawn Oatley
> Sent: Fri 8/28/2009 9:26 AM
> To: [email protected]; [email protected]
> Subject: Re: [OpenLayers-Users] Cluster strategy not working
>
> I don't have any input regarding the code, but I have worked with IE 8.
> Not sure if that is an option, but if it is, they have a powerful script
> debugger that allows you to step through the code also.
>
> Shawn
>
>>>> Max Stephan <[email protected]> 08/28/09 8:24 AM >>>
>
> Hi Jerome,
>
> I´d be very happy if I could use Firebug in this case (very nice tool
> for
> debugging and for tracking the DOM in my opinion) but as I mentioned
> above:
> I´m using an ActiveX-Control for reading out the Access-Database and for
> sending further requests to it. And this method is only possible in
> Internet
> Explorer for which I haven´t found such a powerful debugging tool as
> firebug
> (firebug lite wasn´t useful).
>
> Ok, now here´s the loop, which is adding the vector-features to my
> vector-layer:
> for (var i=0; i<mestArray.length; i++){
> addVector(vectorLayer, mestArray[i][1], mestArray[i][0]);
> }
> The first parameter is the target-layer, the second is a lonlat-object
> and
> the third is an attribute for the features.
>
> And here´s the addVector-function:
> function addVector(layer, lonlat, mestId){
> var geometryObjekt = new
> OpenLayers.Geometry.Point(lonlat.lon,lonlat.lat);
> var vectorObjekt = new OpenLayers.Feature.Vector(geometryObjekt);
> vectorObjekt.attributes.mest = mestId;
> layer.addFeatures([vectorObjekt]);
> }
>
> And concerning your english: No need to be worried. I´m understanding
> everything.
>
> Thx in advance
> Max Stephan
>
> Jerome Freyre wrote:
>>
>> Can you also show us your method that parse and add the feature to the
>
>> layer?
>>
>> I think another good way to explore is to use firefox and firebug.
>>
>> With firebug, you can add breakpoints and the go step-by-step...
>>
>>
>> Whith that, you should put a breakpoint into your method that parse
>> and add features to layer and another one into the cluster strategy
>> (Think to not use the OpenLayers minimised but the complete source) to
>
>> see if software run into the class correctly...
>>
>>
>> Hope my english is quite understandable.... :)
>>
>>
>>
>> Jérome
>>
>>
>>
>> Le 28 août 09 à 14:01, Max Stephan (via Nabble) a écrit :
>>
>>> Hi Jerome,
>>>
>>> thanks for your reply. I already tried that but it causes an error
>>> ("this.layer.events" is null or no object) and the map content isnÂ
>>> ´t shown.
>>>
>>> Any other ideas?
>>>
>>> Greets,
>>> Max Stephan
>>> Jerome Freyre wrote:
>>> Hi Max,
>>>
>>> Personnally, when I use Cluster Strategy, I create separatly the
>>> strategy and the I activate it.
>>>
>>>
>>> var strat = new
> OpenLayers.Strategy.Cluster({distance:20});
>>> vectorLayer = new
> OpenLayers.Layer.Vector("Vektorlayer",{
>>> strategies: [
>>> strategy
>>> ],
>>> styleMap: vectorStyle2, maxResolution: 19});
>>> strat.activate();
>>>
>>>
>>> Hope it will be usefull....
>>>
>>> Sincerly,
>>> Jérome
>>>
>>> Max Stephan wrote:
>>> Hi everybody,
>>>
>>> I`m having problems getting the cluster strategy to work. It simply
>>> makes no difference in terms of appearance if I add it to the
>>> VectorLayer or not.
>>>
>>> This is my code for the layer:
>>> vectorLayer = new
> OpenLayers.Layer.Vector("Vektorlayer",{
>>> strategies: [
>>> new
> OpenLayers.Strategy.Cluster({distance:20})
>>> ],
>>> styleMap: vectorStyle2, maxResolution: 19});
>>>
>>>
>>> The reason why I want to add it is that I have 480 Features
>>> alltogether on my map and even when zooming into some areas there
>>> are still around 150 features left in the bbox causing
>>> InternetExplorer to slow down (don´t know if it´s the same case
>>> with Firefox, but I gotta use IE to use ADODB-Connection to an
>>> Access Database in the Intranet).
>>>
>>> Those features are created and added step by step with an addVector-
>>> method I have implemented that reads out the coordinates and
>>> attributes of the database for a single feature and then jumps to
>>> the next entry and repeats the procedure till all features have been
>
>>> added.
>>>
>>> greets and thx in advance
>>> Max Stephan
>>>
>>>
>>> View message @
>>>
> http://n2.nabble.com/Cluster-strategy-not-working-tp3533851p3534202.html
>>> To unsubscribe from Re: Cluster strategy not working, click here.
>>>
>>
>>
>>
>
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