/**
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* Projection class for Baidu Spherical Mercator
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*
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* @class BaiduSphericalMercator
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*/
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L.Projection.BaiduSphericalMercator = {
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/**
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* Project latLng to point coordinate
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*
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* @method project
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* @param {Object} latLng coordinate for a point on earth
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* @return {Object} leafletPoint point coordinate of L.Point
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*/
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project: function(latLng) {
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var projection = new BMap.MercatorProjection();
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var originalPoint = new BMap.Point(latLng.lng, latLng.lat);
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//var baiduPoint = window.translatePoint(originalPoint);
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var point = projection.lngLatToPoint(originalPoint);
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var leafletPoint = new L.Point(point.x, point.y);
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return leafletPoint;
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},
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/**
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* unproject point coordinate to latLng
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*
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* @method unproject
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* @param {Object} bpoint baidu point coordinate
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* @return {Object} latitude and longitude
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*/
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unproject: function (bpoint) {
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var projection= new BMap.MercatorProjection();
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var point = projection.pointToLngLat(
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new BMap.Pixel(bpoint.x, bpoint.y)
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);
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var latLng = new L.LatLng(point.lat, point.lng);
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return latLng;
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},
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/**
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* Don't know how it used currently.
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*
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* However, I guess this is the range of coordinate.
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* Range of pixel coordinate is gotten from
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* BMap.MercatorProjection.lngLatToPoint(180, -90) and (180, 90)
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* After getting max min value of pixel coordinate, use
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* pointToLngLat() get the max lat and Lng.
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*/
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bounds: (function () {
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var MAX_X= 20037726.37;
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var MIN_Y= -11708041.66;
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var MAX_Y= 12474104.17;
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var bounds = L.bounds(
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[-MAX_X, MIN_Y], //-180, -71.988531
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[MAX_X, MAX_Y] //180, 74.000022
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);
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var MAX = 33554432;
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bounds = new L.Bounds(
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[-MAX, -MAX],
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[MAX, MAX]
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);
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return bounds;
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})()
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};
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/**
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* Coordinate system for Baidu EPSGB3857
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*
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* @class EPSGB3857
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*/
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L.CRS.EPSGB3857 = L.extend({}, L.CRS, {
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code: 'EPSG:B3857',
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projection: L.Projection.BaiduSphericalMercator,
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transformation: (function () {
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var z = -18 - 8;
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var scale = Math.pow(2, z);
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return new L.Transformation(scale, 0.5, -scale, 0.5);
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}())
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});
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/**
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* Tile layer for Baidu Map
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*
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* @class BaiduLayer
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*/
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L.TileLayer.BaiduLayer4Kylin = L.TileLayer.extend({
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statics: {
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attribution: '© 2014 Baidu - GS(2012)6003;- Data © <a target="_blank" href="http://www.navinfo.com/">NavInfo</a> & <a target="_blank" href="http://www.cennavi.com.cn/">CenNavi</a> & <a target="_blank" href="http://www.365ditu.com/">DaoDaoTong</a>'
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},
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options: {
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minZoom: 3,
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maxZoom: 19
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},
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initialize: function (url, options) {
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options = options || {};
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options.subdomains = '0123456789';
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options.attribution = '';
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L.TileLayer.prototype.initialize.call(this, url, options);
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},
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getTileUrl: function (coords) {
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var offset = Math.pow(2, coords.z - 1),
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x = coords.x - offset,
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y = offset - coords.y - 1,
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baiduCoords = L.point(x, y);
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baiduCoords.z = coords.z;
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return L.TileLayer.prototype.getTileUrl.call(this, baiduCoords);
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}
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});
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L.tileLayer.baiduLayer4Kylin = function (url, options) {
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return new L.TileLayer.BaiduLayer4Kylin(url, options);
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};
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