c20390c864
git-svn-id: http://svn.openlayers.org/trunk/openlayers@802 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
124 lines
4.8 KiB
JavaScript
124 lines
4.8 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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units: 'degrees',
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scales: {inches: 1, feet: 12, miles: 63360.0, meters: 39.3701, kilometers: 39370.1, degrees: 4374754},
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resolution: 72,
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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, units, resolution) {
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var newArguments = new Array();
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if (units) this.units = units;
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if (resolution) this.resolution = resolution;
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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 maxRes = this.map.maxResolution;
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var mapRes = this.map.getResolution();
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var scale = (((this.tileSize.w * this.map.maxResolution * this.resolution) * (this.scales[this.units])) / this.tileSize.w) / Math.pow(2, zoom);
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var cellSize = new OpenLayers.Size(mapRes*this.tileSize.w, mapRes*this.tileSize.h);
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var pX = Math.floor(((bounds.left) / cellSize.w) * this.tileSize.w);
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var pY = -Math.floor(((bounds.top) / 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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_initTiles:function() {
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//first of all, clear out the main div
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this.div.innerHTML = "";
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//now clear out the old grid and start a new one
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this.clearGrid();
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this.grid = new Array();
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var viewSize = this.map.getSize();
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var bounds = this.map.getExtent();
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var extent = this.map.getFullExtent();
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var resolution = this.map.getResolution();
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var tilelon = resolution*this.tileSize.w;
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var tilelat = resolution*this.tileSize.h;
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var offsetlon = bounds.left;
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var tilecol = Math.floor(offsetlon/tilelon);
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var tilecolremain = offsetlon/tilelon - tilecol;
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var tileoffsetx = -tilecolremain * this.tileSize.w;
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var tileoffsetlon = tilecol * tilelon;
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var offsetlat = bounds.top;
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var tilerow = Math.ceil(offsetlat/tilelat);
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var tilerowremain = tilerow - offsetlat/tilelat;
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var tileoffsety = -(tilerowremain+1) * this.tileSize.h;
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var tileoffsetlat = tilerow * tilelat;
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tileoffsetx = Math.round(tileoffsetx); // heaven help us
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tileoffsety = Math.round(tileoffsety);
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this.origin = new OpenLayers.Pixel(tileoffsetx,tileoffsety);
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var startX = tileoffsetx;
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var startLon = tileoffsetlon;
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do {
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var row = new Array();
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this.grid.append(row);
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tileoffsetlon = startLon;
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tileoffsetx = startX;
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do {
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var tileBounds = new OpenLayers.Bounds(tileoffsetlon,
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tileoffsetlat,
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tileoffsetlon+tilelon,
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tileoffsetlat+tilelat);
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var tile = this.addTile(tileBounds,
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new OpenLayers.Pixel(tileoffsetx - parseInt(this.map.layerContainerDiv.style.left),
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tileoffsety - parseInt(this.map.layerContainerDiv.style.top))
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);
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tile.draw((this.params.TRANSPARENT == 'true'));
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row.append(tile);
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tileoffsetlon += tilelon;
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tileoffsetx += this.tileSize.w;
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} while (tileoffsetlon < bounds.right)
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tileoffsetlat -= tilelat;
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tileoffsety += this.tileSize.h;
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} while(tileoffsetlat > bounds.bottom - tilelat)
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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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