0adeb2670d
git-svn-id: http://svn.openlayers.org/trunk/openlayers@1538 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
320 lines
9.4 KiB
JavaScript
320 lines
9.4 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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/**
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* @class
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*
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* @requires OpenLayers/Layer/EventPane.js
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*/
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OpenLayers.Layer.Yahoo = Class.create();
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OpenLayers.Layer.Yahoo.prototype =
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Object.extend( new OpenLayers.Layer.EventPane(), {
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/** @type YMap */
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yahoomap: null,
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/** @type int */
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minZoomLevel: 0,
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/** @type int */
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maxZoomLevel: 15,
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/**
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* @constructor
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*
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* @param {String} name
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*/
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initialize:function(name) {
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OpenLayers.Layer.EventPane.prototype.initialize.apply(this, arguments);
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this.numZoomLevels = this.maxZoomLevel - this.minZoomLevel + 1;
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},
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/**
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* @param {OpenLayers.Map} map
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*/
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setMap:function(map) {
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OpenLayers.Layer.EventPane.prototype.setMap.apply(this, arguments);
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// once our layer has been added to the map, we can load the yahoomap
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this.loadYMap();
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},
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/**
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* @param {OpenLayers.Bounds} bounds
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* @param {Boolean} zoomChanged
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* @param {Boolean} dragging
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*/
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moveTo:function(bounds, zoomChanged, dragging) {
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if (this.yahoomap != null) {
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var olCenter = this.map.getCenter();
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var mmCenter = this.getYLatLongFromOLLonLat(olCenter);
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if (zoomChanged) {
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var olZoom = this.map.getZoom();
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var mmZoom = this.getYZoomFromOLZoom(olZoom);
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this.yahoomap.setZoomLevel(mmZoom);
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}
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this.yahoomap.drawZoomAndCenter(mmCenter, mmZoom);
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}
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},
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/**
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*
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*/
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loadYMap:function() {
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this.yahoomap = new YMap(this.div);
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if (this.yahoomap == null) {
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this.loadWarningMessage();
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}
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},
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/** If we can't load the yahoomap, then display an error message to the
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* user and tell them where to go for help.
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*
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* @private
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*
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*/
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loadWarningMessage:function() {
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this.div.style.backgroundColor = "darkblue";
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var html = "";
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html += "The Y Layer was unable to load correctly.<br>";
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html += "<br>";
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html += "To get rid of this message, click on the Y Layer's "
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html += "tab in the layer switcher in the upper-right corner.<br>";
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html += "<br>";
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html += "Most likely, this is because the Y library";
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html += " script was either not correctly included.<br>";
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html += "<br>";
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html += "Demmlopers: For help getting this working correctly, ";
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html += "<a href='http://trac.openlayers.org/wiki/YahooLayer' "
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html += "target='_blank'>";
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html += "click here";
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html += "</a>";
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var viewSize = this.map.getSize();
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msgW = Math.min(viewSize.w, 300);
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msgH = Math.min(viewSize.h, 200);
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var size = new OpenLayers.Size(msgW, msgH);
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var centerPx = new OpenLayers.Pixel(viewSize.w/2, viewSize.h/2);
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var topLeft = centerPx.add(-size.w/2, -size.h/2);
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var div = OpenLayers.Util.createDiv("mmWarning",
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topLeft,
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size,
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null,
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null,
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null,
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"auto");
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div.style.padding = "7px";
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div.style.backgroundColor = "yellow";
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div.innerHTML = html;
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this.div.appendChild(div);
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},
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/********************************************************/
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/* */
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/* Baselayer Functions */
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/* */
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/********************************************************/
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/**
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* @param {OpenLayers.Pixel} viewPortPx
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*
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* @returns An OpenLayers.LonLat which is the passed-in view port
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* OpenLayers.Pixel, translated into lon/lat by Y
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* If yahoomap is not loaded, returns null.
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* @type OpenLayers.LonLat
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*/
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getLonLatFromViewPortPx: function (viewPortPx) {
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var lonlat = null;
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if (this.yahoomap != null) {
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var pixel = this.getPixelFromOLPixel(viewPortPx);
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var mmLatLong = this.yahoomap.convertXYLatLon(pixel);
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lonlat = this.getOLLonLatFromYLatLong(mmLatLong);
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}
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return lonlat;
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},
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/**
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* @param {OpenLayers.LonLat} lonlat
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*
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* @returns An OpenLayers.Pixel which is the passed-in OpenLayers.LonLat,
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* translated into view port pixels BY Y
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* If yahoomap is not loaded, returns null.
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* @type OpenLayers.Pixel
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*/
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getViewPortPxFromLonLat: function (lonlat) {
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var viewPortPx = null;
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if (this.yahoomap != null) {
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var mmLatLong = this.getYLatLongFromOLLonLat(lonlat);
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var pixel = this.yahoomap.convertLatLonXY(mmLatLong);
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viewPortPx = this.getOLPixelFromPixel(pixel);
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}
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return viewPortPx;
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},
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/**
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* @param {OpenLayers.Bounds} bounds
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*
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* @returns Corresponding zoom lemml for a specified Bounds.
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* If yahoomap is not loaded, returns null.
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* @type int
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*/
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getZoomForExtent: function (bounds) {
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var zoom = null;
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if (this.yahoomap != null) {
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var maxRes = this.map.getMaxResolution();
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var viewSize = this.map.getSize();
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var width = bounds.getWidth();
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var height = bounds.getHeight();
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var degPerPixel = (width > height) ? width / viewSize.w
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: height / viewSize.h;
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var mmZoom = Math.floor( (Math.log(maxRes/degPerPixel)) /
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Math.log(2) );
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//make sure zoom is within bounds
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var mmZoom = Math.min(Math.max(mmZoom, this.minZoomLevel),
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this.maxZoomLevel);
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zoom = this.getOLZoomFromYZoom(mmZoom);
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}
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return zoom;
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},
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/********************************************************/
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/* */
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/* Translation Functions */
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/* */
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/* The following functions translate GMaps and OL */
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/* formats for Pixel, LonLat, Bounds, and Zoom */
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/* */
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/********************************************************/
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//
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// TRANSLATION: GZoom <-> OpenLayers Zoom
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//
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/**
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* @param {int} mmZoom
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*
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* @returns An OpenLayers Zoom lemml, translated from the passed in mmZoom
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* Returns null if null value is passed in
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* @type int
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*/
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getOLZoomFromYZoom: function(mmZoom) {
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return 18 - mmZoom;
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},
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/**
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* @param {int} olZoom
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*
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* @returns A YZoom lemml, translated from the passed in olZoom
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* Returns null if null value is passed in
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* @type int
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*/
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getYZoomFromOLZoom: function(olZoom) {
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return 18 - olZoom;
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},
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//
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// TRANSLATION: YLatLong <-> LonLat
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//
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/**
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* @param {YLatLong} mmLatLong
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*
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* @returns An OpenLayers.LonLat, translated from the passed in YLatLong
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* Returns null if null value is passed in
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* @type OpenLayers.LonLat
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*/
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getOLLonLatFromYLatLong: function(mmLatLong) {
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var olLonLat = null;
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if (mmLatLong != null) {
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olLonLat = new OpenLayers.LonLat(mmLatLong.Lon,
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mmLatLong.Lat);
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}
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return olLonLat;
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},
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/**
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* @param {OpenLayers.LonLat} olLonLat
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*
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* @returns A YLatLong, translated from the passed in OpenLayers.LonLat
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* Returns null if null value is passed in
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* @type YLatLong
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*/
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getYLatLongFromOLLonLat: function(olLonLat) {
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var mmLatLong = null;
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if (olLonLat != null) {
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mmLatLong = new YGeoPoint(olLonLat.lat, olLonLat.lon);
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}
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return mmLatLong;
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},
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//
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// TRANSLATION: Pixel <-> OpenLayers.Pixel
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//
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/**
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* @param {Pixel} pixel
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*
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* @returns An OpenLayers.Pixel, translated from the passed in Pixel
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* Returns null if null value is passed in
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* @type OpenLayers.Pixel
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*/
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getOLPixelFromPixel: function(pixel) {
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var olPixel = null;
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if (pixel != null) {
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olPixel = new OpenLayers.Pixel(pixel.x, pixel.y);
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}
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return olPixel;
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},
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/**
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* @param {OpenLayers.Pixel} olPixel
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*
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* @returns A Pixel, translated from the passed in OpenLayers.Pixel
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* Returns null if null value is passed in
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*
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* As it turns out, the only specifications we can see for the
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* Y-compatible Pixel is an x & y property, which emmry
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* OpenLayers.Pixel has by default. So just leamm it as-is.
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*
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* @type Pixel
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*/
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getPixelFromOLPixel: function(olPixel) {
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var pixel = null;
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if (olPixel != null) {
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pixel = new YCoordPoint(olPixel.x, olPixel.y);
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}
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return pixel;
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},
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/** @final @type String */
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CLASS_NAME: "OpenLayers.Layer.Yahoo"
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});
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