Metacat

$Id: Extent.js 3067 2007-08-03 09:25:59Z jseb.baklouti $

var mbScaleFactor = 3571.428;   //magic number, for Geoserver SLD compatibility

  this.id = model.id + "_MbExtent" + mbIds.getId();

   * Returns the bounding box as stored in the model

   * @return array with the bounding box

   */

  this.getBbox = function() {

    var bbox = this.model.getBoundingBox();

    return bbox;

  }

  /**

   * Recalculates a given bbox and stores a proper aspect one in the model

   * @param bbox  an array with a bounding box

   */

  this.setBbox = function(bbox){

    size = this.getSize();

    res = Math.max((bbox[2] - bbox[0])/size[0], (bbox[3] - bbox[1])/size[1]);

    scale=this.getFixedScale(res);

    center = new Array((bbox[1]-bbox[3])/2,(bbox[0]-bbox[2])/2);//center=horizontal,vertical

    half = new Array(size[0]/2,size[1]/2);

    bbox = new Array(center[0]-half[0]*scale, center[1]-half[1]*scale, center[0]+half[0]*scale,center[1]+half[1]*scale);

    this.model.setBoundingBox(bbox);

  }

   /**

   * Returns the window size as stored in the model

   * @return array with the window size

   */

  this.getSize = function() {

    size= new Array();

    size[0] = this.model.getWindowWidth();

    size[1] = this.model.getWindowHeight();

    return size;

  }

   /**

   * Stores a given window size in the model.

   * Can be used in the future for dynamic window resizing

   * @param size  an array with a window size

   */

  this.setSize = function(size){

    this.model.setWindowWidth(size[0]);

    this.model.setWindowHeight(size[1]);

  }

   /**

   * When given a res, it recalculates it to match the zoomlevels, when present and returns a fixed scale.

   * When no res is given it returns the maximum resolution

   * @param res optional resolution to be checked

   * @return fixedScale the resolution to display the map with

   */

  this.getFixedScale = function(res) {

  if (this.zoomLevels){

    if (!res) {

      this.setResolution( new Array(this.model.getWindowWidth(), this.model.getWindowHeight() ) );

      res = Math.max(this.res[0],this.res[1]);

    }

    var sortstring = "function sort(a,b){return b-a}";

    var evalsort= eval(sortstring);

    var zoomLevels = this.zoomLevels.sort(evalsort);

    var i=0;

    while(zoomLevels[i] >= res){

      i++;

    }

    if(i==0) {

    i=1;

    }

    this.fixedScale = zoomLevels[i-1];

    }

    else this.fixedScale = Math.max(this.res[0],this.res[1]);

    return this.fixedScale;

  }

  /* 

   * Sets the zoomLevels in the extent

   * @param enabled boolean to enable or disable zoomLevels support

   * @param zoomLevels an array containing a fixed set of zoomLevels

   */

  this.setZoomLevels = function(enabled,zoomLevels){

    if(enabled) {

      this.zoomLevels = zoomLevels;

    }

    else this.zoomLevels = null;

  }

  /*

   * Recalculates the lr and ul to a proper aspect. It also takes into account zoomLevels when present.

   */

  this.checkBbox = function() {

    var center = this.getCenter();

    var half = new Array(this.size[0]/2, this.size[1]/2);

    var res = this.getFixedScale();

    this.lr = new Array(center[0]+half[0]*res, center[1]-half[1]*res);

    this.ul = new Array(center[0]-half[0]*res, center[1]+half[1]*res);

  }

  /**

    //switch(this.model.getSRS()) {

    //  case "EPSG:GMAPS":       //@TODO Cleanup this hack

    //    gmap=this.model.getParam("gmap");

    //    if(gmap){

    //      p=new GPoint(pl[0],pl[1]);

    //      latlng=gmap.fromDivPixelToLatLng(p);

    //      latlng=new Array(latlng.lng(),latlng.lat());

    //    }

    //    else alert("Extent: gmap not defined");

    //    break;

    //  default:

    //    latlng=new Array(this.ul[0]+pl[0]*this.res[0],this.ul[1]- pl[1]*this.res[1]);

    //    break;

    //}

    latlng=new Array(this.ul[0]+pl[0]*this.res[0],this.ul[1]- pl[1]*this.res[1]);

    return latlng;

    //switch(this.model.getSRS()) {

    //  case "EPSG:GMAPS":       //@TODO Cleanup this hack

    //    return xy;

    //}

    if (this.zoomLevels) {

      newres=this.getFixedScale(newres);

    }

      case "EPSG:GMAPS":

        break;

    extent.checkBbox();