Hey-
Clark Woodward wrote:
> I am having trouble setting the extent of my map to the extent of a
> layer. The code below adds a Google base map and a WKT layer to the map
> and correctly projects the polygon.
>
> However, I need to set the map center and scale so that the layer is
> correctly positioned on the map. Essentially I want to set the map
> extent = layer extent.
>
>
>
> I believe I am using the two lines below incorrectly
>
>
>
> /var bounds = new OpenLayers.Bounds(thrvec.getExtent);/
getExtent is a function
getExtent() is the results of the function called with no arguments.
>
> /alert (bounds.toString);/
toString is a function
toString() is the results of the function called with no arguments.
Does that make sense?
>
>
>
> Can someone correct this code or provide me an alternate solution.
> Thanks in advance!
>
>
>
> Clark
>
>
>
>
>
> Extent.js
>
> ______________________________________________________________
>
>
>
>
>
> function init() {
>
>
>
> var proj = new OpenLayers.Projection("EPSG:900913");
>
> var display = new OpenLayers.Projection("EPSG:4326");
>
> var map = new OpenLayers.Map("map", {projection: proj,
> displayProjection: display});
>
> map.addControl(new OpenLayers.Control.MousePosition());
>
> var wkt = new OpenLayers.Format.WKT({'internalProjection': proj,
> 'externalProjection': display});
>
>
>
> var gphy=new OpenLayers.Layer.Google("Google", {type: G_HYBRID_MAP,
> numZoomLevels: 20, 'sphericalMercator': true, 'maxExtent': new
> OpenLayers.Bounds(-20037508.34,-20037508.34,20037508.34,20037508.34)});
>
> gphy.setIsBaseLayer(true);
>
> map.addLayers([gphy]);
>
>
>
> // WKT
>
>
>
> str='POLYGON((-118.460185 34.095586,-118.458857 34.095874,-118.457521
> 34.095991,-118.456222 34.095947,-118.455012 34.095732,-118.453946
> 34.095366,-118.453056 34.094858,-118.452386 34.094218,-118.451945
> 34.093481,-118.451766 34.092677,-118.451837 34.091830,-118.452179
> 34.090969,-118.452769 34.090148,-118.453576 34.089374,-118.454575
> 34.088685,-118.455735 34.088115,-118.457001 34.087681,-118.458329
> 34.087392,-118.459664 34.087275,-118.460964 34.087320,-118.462163
> 34.087525,-118.463239 34.087900,-118.464118 34.088408,-118.464799
> 34.089048,-118.465240 34.089785,-118.465420 34.090589,-118.465338
> 34.091436,-118.464996 34.092288,-118.464417 34.093118,-118.463610
> 34.093892,-118.462600 34.094572,-118.461451 34.095152,-118.460185
> 34.095586))';
>
>
>
> features=wkt.read([str]);
>
> var style1 ={fillColor: '#FFFF33', fillOpacity: .5};
>
> var thrvec=new OpenLayers.Layer.Vector('WKT', {style: style1});
>
> map.addLayers([thrvec]);
>
> thrvec.addFeatures(features);
>
>
>
> var bounds = new OpenLayers.Bounds(thrvec.getExtent);
>
>
>
> alert (bounds.toString);
>
>
>
> bounds.transform(display,proj);
>
> map.zoomToExtent(bounds)
>
>
>
> var point = new OpenLayers.LonLat(-118.458591, 34.091633);
>
> point.transform(display,proj);
>
> map.setCenter(point,13);
>
>
>
> }
>
>
>
>
>
>
>
>
>
>
>
> HTML
>
> ______________________________________________________________
>
>
>
> <html xmlns="http://www.w3.org/1999/xhtml";>
>
> <head>
>
> <script
> src='http://maps.google.com/maps?file=api&v=2&key=ABQIAAAAjpkAC9ePGem0lIq5XcMiuhR_wWLPFku8Ix9i2SXYRVK3e45q1BQUd_beF8dtzKET_EteAjPdGDwqpQ'></script>
>
> <script src="OpenLayers.js"></script>
>
> <script src="extent.js"></script>
>
> <link rel="stylesheet" href="style.css" type="text/css" />
>
>
>
>
>
> </head>
>
> <body onload="init()">
>
> <div id="map" style="width: 671px; height: 461px; vertical-align:
> middle; horizontal-align: center;"></div>
>
> </body>
>
> </html>
>
>
>
>
> ------------------------------------------------------------------------
>
> _______________________________________________
> Dev mailing list
> Dev@openlayers.org
> http://openlayers.org/mailman/listinfo/dev
--
Tim Schaub
OpenGeo - http://opengeo.org
Expert service straight from the developers.
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