Metacat

/*

Author:       Tom Kralidis

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

$Id: Locations.js 3821 2008-02-01 13:58:30Z ahocevar $

*/

// Ensure this object's dependancies are loaded.

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

/**

 * Widget to display predefined locations (as per schema at lib/model/schemas/locations.xsd)

 * into a HTML select box. Changing a location will set the AOI of the targetModel.

 * TBD: projection coordinate conversion still to be implemented.

 * @constructor

 * @base WidgetBaseXSL

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

 * @param model The model that this widget is a view of.

 */

function Locations(widgetNode, model) {

  WidgetBaseXSL.apply(this,new Array(widgetNode, model));

  /**

   * Change the AOI coordinates from select box choice of prefined locations

   * @param bbox the bbox value of the location keyword chosen

   * @param targetModel the model on which to set the AOI

   * @param srsName srs of the bbox

   */

  this.setAoi = function(bbox, targetModel, srsName) {

    var srsTokens = srsName.split(/[:#]/);

    srsName = 'EPSG:'+srsTokens[srsTokens.length-1];

    if (!srsName) {

      srsName = 'EPSG:4326';

    }

    var proj = new OpenLayers.Projection(srsName);

    var bboxArray = new Array();

    bboxArray     = bbox.split(",");

    var ptUL=new OpenLayers.Geometry.Point(parseFloat(bboxArray[0]),parseFloat(bboxArray[3]));

    var ptLR=new OpenLayers.Geometry.Point(parseFloat(bboxArray[2]),parseFloat(bboxArray[1]));

    ptUL.transform(proj,this.targetModel.proj);

    ptLR.transform(proj,this.targetModel.proj);

    var ul = new Array(ptUL.x,ptUL.y);

    var lr = new Array(ptLR.x,ptLR.y);   

    this.targetModel.setParam("aoi",new Array(ul,lr));

    //convert this.model XY to latlong

    //convert latlong to targetmodel XY

    this.targetModel.map.zoomToExtent(new OpenLayers.Bounds(ul[0],lr[1],lr[0],ul[1]));

  }

}