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