Thanks for the example Slawomir. You are right, currently the NG renderers
(which SVG2 is a subclass of) don't recalculate styles on zoom change. I
created a ticket (http://trac.osgeo.org/openlayers/ticket/3257). If fixed
wisely, the performance impact of recalculating the styles on zoom level
changes will be minimal.
Andreas.
On Apr 13, 2011, at 09:55 , Slawomir Messner wrote:
> Sure,
> last time I wanted to post code here it was too long so I don't try to send
> our style map and shorten it this time.
> Our projection is 900913. The "mapObject" is our map-controller so you should
> replace it by your way to find the map.
>
> var defaultStyle = new OpenLayers.Style({
> 'pointRadius': '1',
> 'fillColor': '#008700',
> 'fillOpacity': '0.6',
> 'stroke': 'True',
> 'strokeColor': '#21007E',
> 'strokeOpacity': '0.9',
> 'strokeWidth': '1',
> 'strokeDashstyle': 'solid',
> 'label': '${labelText}',
> 'fontSize': '${getLabelFontSize}',
> 'labelXOffset': '3',
> 'labelYOffset': '3',
> 'fontFamily': 'Arial',
> 'labelAlign': 'lb',
> 'display': ''
> });
>
> defaultREDEStyle = new OpenLayers.Style({
> 'pointRadius': '1',
> 'fillColor': '#008700',
> 'fillOpacity': '0.6',
> 'stroke': 'True',
> 'strokeColor': '#21007E',
> 'strokeOpacity': '0.9',
> 'strokeWidth': '1',
> 'strokeDashstyle': 'solid',
> 'label': '',
> 'fontSize': '6px',
> 'labelXOffset': '3',
> 'labelYOffset': '3',
> 'fontFamily': 'Arial',
> 'labelAlign': 'lb',
> 'display': ''
> });
> var defaultStyleMap = new OpenLayers.StyleMap({ 'default': defaultStyle,
> 'redeDefault':defaultREDEStyle });
>
> defaultStyleMap.styles["default"].context =
> { getLabelFontSize: function (feature) {
> var fontSize = (feature.attributes.style != null &&
> feature.attributes.style.fontSize != null &&
> feature.attributes.style.fontSize)
> || (feature.layer &&
> feature.layer.styleMap.styles["redeDefault"].defaultStyle.fontSize);
>
> return Math.min(25, Math.max(5, parseInt(fontSize) * 6000 /
> feature.layer.map.getResolution())) + "px";
> },
> labelText:function(feature){
> if(feature.attributes.style != null && feature.attributes.style.label !=
> null) {
> return feature.attributes.style.label.length > 0 ?
> feature.attributes.style.label : '';
> } else if(feature.layer) {
> return
> feature.layer.styleMap.styles["redeDefault"].defaultStyle.label;
> } else {
> return '';
> }}
>
> }
>
> var layer = new OpenLayers.Layer.Vector("test",
> {styleMap:defaultStyleMap,renderers : ["SVG"]});
> layer.addFeatures(new OpenLayers.Feature.Vector(new
> OpenLayers.Geometry.Point(893208.5127734,6940239.5448242),{style:{label:"test1",fontSize:"20px"
> }}));
> layer.addFeatures(new OpenLayers.Feature.Vector(new
> OpenLayers.Geometry.Point(1143208.5127734,6910239.5448242),{style:{label:"test1"}}));
> layer.addFeatures(new OpenLayers.Feature.Vector(new
> OpenLayers.Geometry.Point(1403208.5127734,6910239.5448242),{style:{label:"test1"}}));
> layer.addFeatures(new OpenLayers.Feature.Vector(new
> OpenLayers.Geometry.Point(1108208.5127734,6605239.5448242),{style:{label:"test1"}}));
> mapObject.map.addLayer(layer);
> var layer2 = new OpenLayers.Layer.Vector("test2",
> {styleMap:defaultStyleMap,renderers : ["SVG2"]});
> layer2.addFeatures(new OpenLayers.Feature.Vector(new
> OpenLayers.Geometry.Point(893208.5127734,6940239.5448242),{style:{label:"test1",fontSize:"20px"
> }}));
> layer2.addFeatures(new OpenLayers.Feature.Vector(new
> OpenLayers.Geometry.Point(1143208.5127734,6910239.5448242),{style:{label:"test1"}}));
> layer2.addFeatures(new OpenLayers.Feature.Vector(new
> OpenLayers.Geometry.Point(1403208.5127734,6910239.5448242),{style:{label:"test1"}}));
> layer2.addFeatures(new OpenLayers.Feature.Vector(new
> OpenLayers.Geometry.Point(1108208.5127734,6605239.5448242),{style:{label:"test1"}}));
> mapObject.map.addLayer(layer2);
>
> Regards,
> Slawomir
>
> Am 13.04.2011 09:25, schrieb Andreas Hocevar:
>> Hey Slawomir,
>>
>> thanks for the feedback. Can you please provide a working example so we can
>> reproduce and fix the issue?
>>
>> Thanks,
>> Andreas.
>>
>> On Apr 13, 2011, at 08:14 , Slawomir Messner wrote:
>>
>>> Hi,
>>> would like to use it too but we use a style map with context so that labels
>>> and graphics change size on zoom but the functions are not called with SVG2
>>> when zoomed only with SVG so the things stay at initial size dependent on
>>> the zoom level at loading. I hope this is not the reason for performance
>>> boost. Is it normal that SVG2 doesn't call the functions of
>>> context/symbolizers?
>>> Best regards,
>>> Slawomir
>>>
>>> Am 12.04.2011 17:34, schrieb mortac8:
>>>> This is amazing. I can draw 10,000 features in Opera and zoom in/out in
>>>> <500ms on the provided timer.
>>>>
>>>> --
>>>> View this message in context:
>>>> http://osgeo-org.1803224.n2.nabble.com/SVG2-and-2-11-tp6251101p6265597.html
>>>> Sent from the OpenLayers Dev mailing list archive at Nabble.com.
>>>> _______________________________________________
>>>> Dev mailing list
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>>>>
>>> _______________________________________________
>>> Dev mailing list
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>>
>>
>
> _______________________________________________
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--
Andreas Hocevar
OpenGeo - http://opengeo.org/
Expert service straight from the developers.
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