[OpenLayers-Users] geometry collection

Thu Aug 6 05:20:58 EDT 2009

Hi Max,

It is possible to add Geometry Collections to Vectorlayers:

var gc_geometry = new OpenLayers.Geometry.Collection(
  [
    new OpenLayers.Geometry.Point( ... ),
    new OpenLayers.Geometry.LineString( ... ),
    new OpenLayers.Geometry.Polygon( ... )
    // etc.
  ]
);

var gc_feature = new OpenLayers.Feature.Vector( gc_geometry );

var vectorLayer = new OpenLayers.Layer.Vector( ... )

vectorLayer.addFeatures( [ gc_feature ] );

Regards,

Marc

Max Weidemann schrieb:
> Dear openlayers users and developers,
>
> I want to know if it is possible to show an geometry collection in an vector
> layer?
> If it is possible could anyone help me please with my code or tell me what
> is the right way for using the geometrycollection??
>
>   
> <html xmlns="http://www.w3.org/1999/xhtml">
>     <head>
>         <title>OpenLayers Boxes Example</title>
>         <link rel="stylesheet" href="../theme/default/style.css"
> type="text/css" />
>         <link rel="stylesheet" href="style.css" type="text/css" />
>         <script src="../lib/OpenLayers.js"></script>
>         <script type="text/javascript">
>             var box_extents = [
>                 [-10, 50, 5, 60],
>                 [-75, 41, -71, 44],
>                 [-122.6, 37.6, -122.3, 37.9],
>                 [10, 10, 20, 20]
>             ];
>             var map;
>             function init(){
>                 map = new OpenLayers.Map('map');
>
>                 var ol_wms = new OpenLayers.Layer.WMS( "OpenLayers WMS",
>                     "http://labs.metacarta.com/wms/vmap0?", {layers:
> 'basic'} );
>
>                 var boxes  = new OpenLayers.Layer.Vector( "Boxes" );
>                 var geomcoll = new OpenLayers.Geometry.Collection;
>
>                 var ext = box_extents[0];
>                     var bounds1 = new OpenLayers.Bounds(ext[0], ext[1],
> ext[2], ext[3]);
>                     var geo1=new
> OpenLayers.Feature.Vector(bounds1.toGeometry());
>                     geomcoll.addComponents(geo1);
>
>                     ext = box_extents[1];
>                     var bounds2 = new OpenLayers.Bounds(ext[0], ext[1],
> ext[2], ext[3]);
>                     var geo2=new
> OpenLayers.Feature.Vector(bounds2.toGeometry());
>                     geomcoll.addComponents(geo2);
>
>                     ext = box_extents[2];
>                     var bounds3 = new OpenLayers.Bounds(ext[0], ext[1],
> ext[2], ext[3]);
>                     var geo3=new
> OpenLayers.Feature.Vector(bounds3.toGeometry());
>                     geomcoll.addComponents(geo3);
>
>                      boxes.addFeatures(geomcoll);
>           
>                 map.addLayers([ol_wms, boxes]);
>                 map.addControl(new OpenLayers.Control.LayerSwitcher());
>                 var sf = new OpenLayers.Control.SelectFeature(boxes);
>                 map.addControl(sf);
>                 sf.activate();
>                 map.zoomToMaxExtent();
>             }
>         </script>
>     </head>
>
>     <body onload="init()">
>         <h1 id="title">Boxes Example</h1>
>
>         <div id="tags">
>         </div>
>
>         <p id="shortdesc">
>             Demonstrate marker and box type annotations on a map.
>         </p>
>
>         <div id="map" class="smallmap"></div>
>
>         <div id="docs"></div>
>     </body>
> </html>
>
>   
>
> The map is shown and the layer boxes is added, but there are no geometries
> shown.
>   

-- 

  Diplom-Geograph Marc Jansen
  - Anwendungsentwickler -

  terrestris GmbH & Co. KG
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