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<b><a href='http://mapbuilder.sourceforge.net'>Community Map Builder</a> 27 Apr 2008</b></em>
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<h2>OverviewMap.js</h2>
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<h4>Summary</h4>
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No overview generated for 'OverviewMap.js'<BR/><BR/>
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<b>Class Summary</b>
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</tr>
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<td width="15%"><b><a href="OverviewMap.html">OverviewMap</a></b></td>
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<td> </td>
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</table>
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<hr/>
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<!-- ========== METHOD SUMMARY =========== -->
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<!-- ========== END METHOD SUMMARY =========== -->
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<pre class="sourceview"><span class="comment">/*
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Author: Gertjan van Oosten gertjan at west dot nl
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License: LGPL as per: http://www.gnu.org/copyleft/lesser.html
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$Id: OverviewMap.js 3887 2008-02-27 18:18:53Z ahocevar $
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*/</span>
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<span class="comment">
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// Ensure this object's dependancies are loaded.</span>
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mapbuilder.loadScript(baseDir+<span class="literal">"/util/openlayers/OpenLayers.js"</span>);
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mapbuilder.loadScript(baseDir+<span class="literal">"/widget/WidgetBase.js"</span>);
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<span class="comment">/**
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* Widget to add an OL OverviewMap to a main map.
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* <span class="attrib">@constructor</span>
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* <span class="attrib">@base</span> WidgetBase
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* <span class="attrib">@param</span> widgetNode The widget's XML object node from the configuration document.
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* <span class="attrib">@param</span> model The model object that this widget belongs to.
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*/</span>
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<span class="reserved">function</span> OverviewMap(widgetNode, model) {
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WidgetBase.apply(<span class="reserved">this</span>,new Array(widgetNode, model));
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var width = <span class="reserved">this</span>.getProperty(<span class="literal">"mb:width"</span>);
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<span class="reserved">if</span> (width) {
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<span class="reserved">this</span>.width = new Number(width);
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}
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var height = <span class="reserved">this</span>.getProperty(<span class="literal">"mb:height"</span>);
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<span class="reserved">if</span> (height) {
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<span class="reserved">this</span>.height = new Number(height);
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}
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var minRatio = <span class="reserved">this</span>.getProperty(<span class="literal">"mb:minRatio"</span>);
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<span class="reserved">if</span> (minRatio) {
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<span class="reserved">this</span>.minRatio = new Number(minRatio);
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}
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var maxRatio = <span class="reserved">this</span>.getProperty(<span class="literal">"mb:maxRatio"</span>);
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<span class="reserved">if</span> (maxRatio) {
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<span class="reserved">this</span>.maxRatio = new Number(maxRatio);
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}
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var layersNode = widgetNode.selectSingleNode(<span class="literal">"mb:layers"</span>);
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<span class="reserved">if</span> (layersNode) {
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<span class="reserved">this</span>.layerNames = new Array();
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var layers = layersNode.childNodes;
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<span class="reserved">for</span> (var i = 0; i < layers.length; i++) {
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<span class="reserved">if</span> (layers[i].firstChild) {
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<span class="reserved">this</span>.layerNames.push(getNodeValue(layers[i]));
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}
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}
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}
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<span class="reserved">this</span>.model.addListener(<span class="literal">"refresh"</span>, <span class="reserved">this</span>.addOverviewMap, <span class="reserved">this</span>);
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}
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<span class="comment">/**
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* Add an overview map to the map in this widget's model.
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* If layers have been specified in the config, clone these layers for the
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* overview map, otherwise just use the base layer from the main map.
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* If any of the layers to use are WMS layers it uses an untiled version of them.
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* <span class="attrib">@param</span> objRef Pointer to widget object.
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*/</span>
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OverviewMap.<span class="reserved">prototype</span>.addOverviewMap = <span class="reserved">function</span>(objRef) {
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<span class="reserved">if</span> (objRef.model && objRef.model.map) {
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var map = objRef.model.map;
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<span class="comment">/** reference to the OpenLayers OverviewMap control */</span>
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<span class="reserved">this</span>.control = null
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<span class="comment">
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// Specify div and layers for overview map.</span>
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var options = {
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div: objRef.getNode(),
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objRef: <span class="reserved">this</span>,
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destroy: <span class="reserved">function</span>() {
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OpenLayers.Control.OverviewMap.<span class="reserved">prototype</span>.destroy.apply(<span class="reserved">this</span>, arguments);
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<span class="reserved">this</span>.div = null;
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objRef.control = null;
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objRef = null;
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},
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layers: new Array()
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};
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<span class="reserved">if</span> (objRef.minRatio) options.minRatio = objRef.minRatio;
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<span class="reserved">if</span> (objRef.maxRatio) options.maxRatio = objRef.maxRatio;
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<span class="comment">
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// Clone the base layer. This is not really the OpenLayers base layer, but</span>
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<span class="comment"> // the lowest layer in the Mapbuilder layers stack.</span>
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<span class="reserved">if</span> (!objRef.layerNames) {
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<span class="reserved">for</span> (var i in map.mbMapPane.oLlayers) {
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var oLlayer = map.mbMapPane.oLlayers[i];
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<span class="reserved">if</span> (oLlayer) {
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var baseLayer = objRef.getClonedLayer(oLlayer, true);
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options.layers.push(baseLayer);
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break;
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}
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}
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}
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<span class="comment">
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// Check for specifically requested layers</span>
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var isBaseLayer = true;
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<span class="reserved">if</span> (objRef.layerNames) {
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<span class="reserved">for</span> (var i = 0; i < objRef.layerNames.length; i++) {
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var oLlayer = map.mbMapPane.getLayer(map.mbMapPane, objRef.layerNames[i]);
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<span class="reserved">if</span> (oLlayer) {
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options.layers.push(objRef.getClonedLayer(oLlayer, isBaseLayer));
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isBaseLayer = false;
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}
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}
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}
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<span class="comment">
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// Determine size:</span>
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<span class="comment"> // - if width and height are both set, use these as the size;</span>
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<span class="comment"> // - if only width or height is set, take aspect ratio of main map into account;</span>
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<span class="comment"> // - otherwise, OL defaults to (180,90).</span>
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var extent = map.getExtent();
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<span class="reserved">if</span> (objRef.width && objRef.height) {
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options.size = new OpenLayers.Size(objRef.width, objRef.height);
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}
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<span class="reserved">else</span> <span class="reserved">if</span> (objRef.width) {
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options.size = new OpenLayers.Size(
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objRef.width,
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objRef.width * extent.getHeight() / extent.getWidth());
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}
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<span class="reserved">else</span> <span class="reserved">if</span> (objRef.height) {
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options.size = new OpenLayers.Size(
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objRef.height * extent.getWidth() / extent.getHeight(),
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objRef.height);
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}
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<span class="comment">
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// Add the overview to the main map</span>
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<span class="reserved">if</span> (!objRef.control) {
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objRef.control = new OpenLayers.Control.OverviewMap(options);
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objRef.control.mapOptions = {theme: null};
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map.addControl(objRef.control);
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}
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<span class="comment">
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// make all layers visible</span>
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<span class="reserved">for</span> (var i=0; i<options.layers.length; i++) {
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options.layers[i].setVisibility(true);
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}
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}
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}
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<span class="comment">/**
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* Clone a map layer (OpenLayers.Layer subclass).
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* If the layer is a WMS layer it returns an untiled version of it.
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* <span class="attrib">@param</span> layer Pointer to layer object.
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* <span class="attrib">@param</span> isBaseLayer {Boolean} optional parameter: should the layer become
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* baselayer on the overview map?
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*/</span>
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OverviewMap.<span class="reserved">prototype</span>.getClonedLayer = <span class="reserved">function</span>(layer, isBaseLayer) {
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<span class="reserved">if</span> (layer == null) {
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<span class="reserved">return</span> null;
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}
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isBaseLayer = isBaseLayer ? true : false;
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<span class="reserved">if</span> (layer instanceof OpenLayers.Layer.WMS) {
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<span class="comment"> // make an untiled wms layer, with ratio 1</span>
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var layerOptions = {
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units: layer.units,
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projection: layer.projection,
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maxExtent: layer.maxExtent,
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maxResolution: <span class="literal">"auto"</span>,
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ratio: 1,
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singleTile: true,
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isBaseLayer: isBaseLayer
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};
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<span class="reserved">return</span> new OpenLayers.Layer.WMS(layer.name,
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layer.url, {
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layers: layer.params.LAYERS,
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format: layer.params.FORMAT,
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transparent: layer.params.TRANSPARENT,
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sld: layer.params.SLD,
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sld_body: layer.params.SLD_BODY,
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styles: layer.params.STYLES
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}, layerOptions);
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}
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<span class="reserved">else</span> {
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<span class="comment"> // take the layer as-is and clone it</span>
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var clonedLayer = layer.clone();
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clonedLayer.setVisibility(true);
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<span class="reserved">return</span> clonedLayer;
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}
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}
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</pre>
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<hr>
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<b><a href='http://mapbuilder.sourceforge.net'>Community Map Builder</a> 27 Apr 2008</b></em>
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333
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<script>
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<!--
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if(window==top) {
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document.writeln('<A HREF="allclasses-noframe.html" TARGET=""><B>All Classes</B></A>');
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338
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}
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339
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//-->
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</script>
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341
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<noscript>
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<a href="allclasses-noframe.html" target=""><b>All Classes</b></a>
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343
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</noscript>
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</font></td>
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</tr>
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</table>
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<hr>
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<font size="-1">
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</font>
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<div class="jsdoc_ctime">Documentation generated by <a href="http://jsdoc.sourceforge.net/" target="_parent">JSDoc</a> on Sun Apr 27 20:30:54 2008</div>
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</body>
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</html>
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