+/* Copyright (c) 2006 MetaCarta, Inc., published under the BSD license.
+ * See http://svn.openlayers.org/trunk/openlayers/license.txt for the full
+ * text of the license. */
+// @require: OpenLayers/Layer/Grid.js
+/**
+* @class
+*/
+OpenLayers.Layer.KaMap = Class.create();
+OpenLayers.Layer.KaMap.prototype =
+ Object.extend( new OpenLayers.Layer.Grid(), {
+ metaTileHeight: 6,
+ metaTileWidth: 6,
+
+ DEFAULT_PARAMS: {
+ i: 'jpeg',
+ map: ''
+ },
+
+ // this.cellSize = newScale/(oMap.resolution * inchesPerUnit[oMap.units]);
+ // kaMap.prototype.geoToPix = function( gX, gY ) { var pX = gX / this.cellSize; var pY = -1 * gY / this.cellSize; }
+ initialize: function(name, url, params, origin) {
+ this.kaOrigin = origin;
+ var newArguments = new Array();
+ newArguments.push(name, url, params);
+ OpenLayers.Layer.Grid.prototype.initialize.apply(this, newArguments);
+ this.params = (params ? params : {});
+ if (arguments.length > 0 && params) {
+ OpenLayers.Util.applyDefaults(
+ this.params,
+ this.DEFAULT_PARAMS
+ );
+ }
+ },
+ addTile:function(bounds,position) {
+ var zoom = this.map.getZoom();
+ var resolution = this.map.getResolution();
+ var scale = 128000000 / Math.pow(2, zoom);
+ // 1280000 is an empirical value for a specific tile server, not yet figured out the right way to do this in general.
+ // This will probably be based on map.maxResolution.
+ var cellSize = new OpenLayers.Size(resolution*this.tileSize.w, resolution*this.tileSize.h);
+ var pX = Math.floor(((bounds.left + this.kaOrigin.lon) / cellSize.w) * this.tileSize.w);
+ var pY = -Math.floor(((bounds.top+this.kaOrigin.lat) / cellSize.h) * this.tileSize.h);
+ var url = this.getFullRequestString(
+ { t: pY,
+ l: pX,
+ s: scale
+ });
+ return new OpenLayers.Tile.Image(this, position, bounds,
+ url, this.tileSize);
+ },
+ /** @final @type String */
+ CLASS_NAME: "OpenLayers.Layer.KaMap"
+});