openlayer4加载百度地图

Posted 2022-11-01 yang_chuanlong

var resolutions = [];
for(var i=0; i<= 18; i++) 
    resolutions[i] = Math.pow(2, 18 - i);


var tileGrid = new ol.tilegrid.TileGrid(
    origin:[0, 0],
    resolutions: resolutions
);

var baiduSource = new ol.source.TileImage(
    projection: "EPSG:3857",
    tileGrid: tileGrid,
    tileUrlFunction: function(tileCoord, pixelRatio, proj) 
        if(!tileCoord)
            return "";
        
        var [z, x, y] = tileCoord;

        if(x < 0) 
            x = `M$-x`;
        
        if(y < 0) 
            y = `M$-y`;
        
        var num = Math.floor(Math.random() * 5);
        return `http://online$num.map.bdimg.com/tile/?qt=tile&x=$x&y=$y&z=$z&styles=pl&scaler=2&udt=20180303`;
    
);

var baiduLayer = new ol.layer.Tile(
    source: baiduSource
);

var map = new ol.Map(
    target:"map",
    layers:[
        baiduLayer
    ],
    view: new ol.View(
        center: ol.proj.fromLonLat([121.48, 31.22]),
        zoom: 8
    )
);