openlayers/lib/OpenLayers/Layer/Boxes.js

   1 /* Copyright (c) 2006-2008 MetaCarta, Inc., published under the Clear BSD
   2  * license.  See http://svn.openlayers.org/trunk/openlayers/license.txt for the
   3  * full text of the license. */
   4
   5
   6 /**
   7  * @requires OpenLayers/Layer.js
   8  * @requires OpenLayers/Layer/Markers.js
   9  */
  10
  11 /**
  12  * Class: OpenLayers.Layer.Boxes
  13  * Draw divs as 'boxes' on the layer.
  14  *
  15  * Inherits from:
  16  *  - <OpenLayers.Layer.Markers>
  17  */
  18 OpenLayers.Layer.Boxes = OpenLayers.Class(OpenLayers.Layer.Markers, {
  19
  20     /**
  21      * Constructor: OpenLayers.Layer.Boxes
  22      *
  23      * Parameters:
  24      * name - {String}
  25      * options - {Object} Hashtable of extra options to tag onto the layer
  26      */
  27     initialize: function (name, options) {
  28         OpenLayers.Layer.Markers.prototype.initialize.apply(this, arguments);
  29     },
  30
  31     /**
  32      * Method: drawMarker
  33      * Calculate the pixel location for the marker, create it, and
  34      *    add it to the layer's div
  35      *
  36      * Parameters:
  37      * marker - {<OpenLayers.Marker.Box>}
  38      */
  39     drawMarker: function(marker) {
  40         var bounds   = marker.bounds;
  41         var topleft  = this.map.getLayerPxFromLonLat(
  42                             new OpenLayers.LonLat(bounds.left,  bounds.top));
  43         var botright = this.map.getLayerPxFromLonLat(
  44                              new OpenLayers.LonLat(bounds.right, bounds.bottom));
  45         if (botright == null || topleft == null) {
  46             marker.display(false);
  47         } else {
  48             var sz = new OpenLayers.Size(
  49                 Math.max(1, botright.x - topleft.x),
  50                 Math.max(1, botright.y - topleft.y));
  51             var markerDiv = marker.draw(topleft, sz);
  52             if (!marker.drawn) {
  53                 this.div.appendChild(markerDiv);
  54                 marker.drawn = true;
  55             }
  56         }
  57     },
  58
  59
  60     /**
  61      * APIMethod: removeMarker
  62      *
  63      * Parameters:
  64      * marker - {<OpenLayers.Marker.Box>}
  65      */
  66     removeMarker: function(marker) {
  67         OpenLayers.Util.removeItem(this.markers, marker);
  68         if ((marker.div != null) &&
  69             (marker.div.parentNode == this.div) ) {
  70             this.div.removeChild(marker.div);
  71         }
  72     },
  73
  74     CLASS_NAME: "OpenLayers.Layer.Boxes"
  75 });