Metacat

/*

Author:       Cameron Shorter cameronATshorter.net

License:      LGPL as per: http://www.gnu.org/copyleft/lesser.html

$Id$

*/

// Ensure this object's dependancies are loaded.

mapbuilder.loadScript(baseDir+"/model/Proj.js");

mapbuilder.loadScript(baseDir+"/widget/MapContainerBase.js");

mapbuilder.loadScript(baseDir+"/widget/Popup.js");

mapbuilder.loadScript(baseDir+"/widget/FeatureFactory.js");

// Resource: http://www.bazon.net/mishoo/articles.epl?art_id=824

/**

 * Render GML point geometery into HTML.  This is a MapContainer widget.

 * Other Geometries could be handled if there was some way to get a point 

 * out of it (e.g. polygon centroid).

 * This widget places an image at the specified point on the map.

 * It also places a highlight image at the same spot and registers a 

 * hihglightFeature event on the model, where the featureId is set as the model param.

 * Models using this widget must implement getFeatureNodes(), 

 * @constructor

 * @base MapContainerBase

 * @param widgetNode  The widget's XML object node from the configuration document.

 * @param model       The model object that this widget belongs to.

 */

function GmlPointRenderer(widgetNode, model) {

  //this.normalImage = widgetNode.selectSingleNode("mb:normalImage").firstChild.nodeValue; 

  	//this.highlightImage = widgetNode.selectSingleNode("mb:highlightImage").firstChild.nodeValue;

  this.popup = new Popup( widgetNode, model );

  this.featureFactory = new FeatureFactory(widgetNode, model);

  /**

    * Clear all markers

    */

  this.clearWidget = function(objRef) {

    // call feature factory since we do not know the implementation

    this.featureFactory.clearFeatures();

  }

  /** draw the points by putting the image at the point

    * @param objRef a pointer to this widget object

    */

  this.paint = function(objRef) {

    // cleanup first

    objRef.clearWidget(objRef );

    if (objRef.model.doc && objRef.node) {

      var containerProj = new Proj(objRef.containerModel.getSRS());

      var features = objRef.model.getFeatureNodes();

      for (var i=0; i<features.length; ++i) {

        var feature = features[i];

        var title = objRef.model.getFeatureName(feature);

        var itemId = objRef.model.getFeatureId(feature);   //or feature id's for feature collections?

        var point = objRef.model.getFeaturePoint(feature);

        if( (point[0] == 0) && (point[1] == 0 )) {

        		return;

        	}

        point = containerProj.Forward(point);

        point = objRef.containerModel.extent.getPL(point);

        // get the popup info from stylesheet

        var popupStr = objRef.popup.transform( objRef.popup, feature );

        // create a point feature

        objRef.featureFactory.createFeature( objRef, 'POINT', point, itemId, title, popupStr );

      }

    }

  }

  this.stylesheet = new XslProcessor(baseDir+"/widget/Null.xsl");

  var base = new MapContainerBase(this,widgetNode,model);

  /** highlights the selected feature by switching to the highlight image

    * @param objRef a pointer to this widget object

    */

  this.highlight = function(objRef, featureId) {

    var normalImageDiv = document.getElementById(featureId+"_normal");

    normalImageDiv.style.visibility = "hidden";

    var highlightImageDiv = document.getElementById(featureId+"_highlight");

    highlightImageDiv.style.visibility = "visible";

  }

  this.model.addListener("highlightFeature",this.highlight, this);

  /** highlights the selected feature by switching to the highlight image

    * @param objRef a pointer to this widget object

    */

  this.dehighlight = function(objRef, featureId) {

    var normalImageDiv = document.getElementById(featureId+"_normal");

    normalImageDiv.style.visibility = "visible";

    var highlightImageDiv = document.getElementById(featureId+"_highlight");

    highlightImageDiv.style.visibility = "hidden";

  }

  this.model.addListener("dehighlightFeature",this.dehighlight, this);

}