Baidu.js
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/**
* @requires SuperMap/Layer/CanvasLayer.js
* @requires SuperMap/Layer/Grid.js
* @requires SuperMap/Tile/Image.js
*/
/**
* Class: SuperMap.Layer.Baidu
* Baidu服务图层类。
* 用于显示Baidu的地图，使用<SuperMap.Layer.Baidu>的
* 构造函数可以创建Baidu图层，更多信息查看：
*
*
*
* Inherits from:
* - <SuperMap.Layer.CanvasLayer>
*/
SuperMap.Layer.Baidu = SuperMap.Class(SuperMap.CanvasLayer, {
offsetXY:null,
/**
* Property: attribution
* {String} The layer attribution.
*/
attribution: "Data by <a style='white-space: nowrap' target='_blank' href='http://map.baidu.com/'>Baidu</a>",
/**
* Constructor: SuperMap.Layer.Baidu
* 创建Baidu图层
*
* Example:
* (code)
*
* var baiduLayer = new SuperMap.Layer.Baidu();
* (end)
*/
initialize: function (options) {
var me = this;
me.name = "Baidu";
me.url = "http://online${num}.map.bdimg.com/onlinelabel/?qt=tile&x=${x}&y=${y}&z=${z}&styles=pl&udt=20150815&scaler=1";
// me.url = "http://shangetu${num}.map.bdimg.com/it/u=x=${x};y=${y};z=${z};v=017;type=web&fm=44&udt=20130712";
/*
offsetXY = [];
offsetXY.push({x:-3,y:1});//3
offsetXY.push({x:-6,y:3});//4
offsetXY.push({x:-12,y:7});//5
offsetXY.push({x:-24,y:15});//6
offsetXY.push({x:-48,y:31});//7
offsetXY.push({x:-96,y:63});//8
offsetXY.push({x:-192,y:127});//9
offsetXY.push({x:-384,y:255});//10
offsetXY.push({x:-768,y:511});//11
offsetXY.push({x:-1536,y:1023});//12
offsetXY.push({x:-3072,y:2047});//13
offsetXY.push({x:-6144,y:4095});//14
offsetXY.push({x:-12288,y:8191});//15
offsetXY.push({x:-24576,y:16383});//16
offsetXY.push({x:-49152,y:32767});//17
offsetXY.push({x:-98304,y:65535});//18
offsetXY.push({x:-196608,y:131071});//19
*/
/*
var minX = 6291456;
var minY = 0;
var maxX= minX + Math.pow(2, 14) * 256 * 5;
var maxY= minY + Math.pow(2, 14) * 256 * 4;
*/
// console.log(Math.pow(2, 15) * 256 * 4); // bounds 3 16 2 4 1 1 19-3=16 0.5 15
var minX = -33554432;
var minY = -33554432;
var maxX= 33554432;
var maxY= 33554432;
var res = Math.pow(2,15);
var resAry= [];
for (var i = 0; i < 17; i++) //百度 3-19
{
resAry[i] = res;
res *= 0.5; //每次二分之一
}
//计算比例尺数组
var scaAry = [];
for(var i = 0;i<17;i++)
{
scaAry[i] = 0.0254/(96*resAry[i]); //0.0254 为英寸和米的转换常数 //PPI 每英寸的像素点数
}
options = SuperMap.Util.extend({
maxExtent: new SuperMap.Bounds(
minX, minY, maxX, maxY
),
tileOrigin:new SuperMap.LonLat(minX, maxY),
resolutions:resAry
}, options);
SuperMap.CanvasLayer.prototype.initialize.apply(me, [me.name, me.url, null, options]);
me.units = "m";
me.projection = "EPSG:900913";
},
getTileUrl:function(xyz){
var me = this,
url = me.url;
/*
var x = xyz.x + offsetXY[xyz.z].x;
var y = offsetXY[xyz.z].y - xyz.y;
var z = xyz.z + 3;
var num = Math.abs((xyz.x + xyz.y) % 8);
num++;
*/
var zoom = xyz.z - 1;
var offsetX = Math.pow(2, zoom+3);
var offsetY = offsetX - 1;
var numX = xyz.x - offsetX;
var numY = -xyz.y + offsetY;
zoom = xyz.z + 3;
var num = Math.abs((xyz.x + xyz.y) % 8)+1;
url = SuperMap.String.format(url, {
num: num,
x: numX,
y: numY,
z: zoom
});
url = url.replace(/-/g,"M");
return url;
},
CLASS_NAME: 'SuperMap.Layer.Baidu'
});