[OpenLayers-Users] Keep Feature.Vector visible near the maps border

[J.Schumann]

Hello,

thanks for that, i'll give it a try or maybe I adjust it to add +X
pixels to each side of this.extent for the intersect-check.

J.Schumann

Am 17.02.2010 22:27, schrieb Arnd Wippermann [via OSGeo.org]:
> Hi,
> 
> I use externalGraphic as Image layer and had the same problem. The image
> vanished, when the point lie outside the view.
> 
> I have patched for this purpose the drawFeature function of renderer.js (as
> Andreas suggest). I add an attribute render="drawAlways" to my feature(s)
> and in the patched function I test for the attribute.
> 
> It works perfect.
> 
>     drawFeature: function(feature, style) {
>         if(style == null) {
>             style = feature.style;
>         }
>         if (feature.geometry) {
>             var bounds = feature.geometry.getBounds();
>             if(bounds) {
>                 if(!bounds.intersectsBounds(this.extent) &&
> (feature.attributes.render == "undefined" || feature.attributes.render !=
> "drawAlways"))
>                     {style={display:"none"};
>                 }
>                 /*
>                 if (!bounds.intersectsBounds(this.extent)) {
>                     style = {display: "none"};
>                 }
>                 */
>                 var rendered = this.drawGeometry(feature.geometry, style,
> feature.id);
>                 if(style.display != "none" && style.label && rendered !==
> false) {
>                     this.drawText(feature.id, style,
> feature.geometry.getCentroid());
>                 } else {
>                     this.removeText(feature.id);
>                 }
>                 return rendered;
>             }
>         }
>     },
> 
> http://gis.ibbeck.de/ginfo/apps/OLExamples/OL27/examples/ExternalGraphicOver
> lay/ExternalGraphicOverlay.asp
> The examples shows the use of externalGraphic as Image layer with the
> possibility to rotate an image.
> 
> Arnd
> 
> 
> 
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> Auftrag von J.Schumann
> Gesendet: Mittwoch, 17. Februar 2010 17:24
> An: [hidden email]
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> Betreff: [OpenLayers-Users] Keep Feature.Vector visible near the maps
> border
> 
> 
> Hi!
> 
> I'm using OpenLayers.Feature.Vector with OpenLayers.Geometry.Point and a
> StyleMap using an externalGraphic. This works good except the fact that the
> features dissappear to early near the map border, when the Point leaves the
> viewport. But I need the externalGraphic to stay visible for some more
> pixels even when the graphics center / the Geometry.Point leaves the
> map. Is
> there any threshold I can set for this purpose?
> 
> Best regards,
> J.Schumann
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