openlayers3应用一：显示百度地图

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在项目中使用百度地图，最直接的方式是使用百度api，但是使用百度api需要申请key，并且某些功能调用有次数限制。

本文讲述在openlayers3中使用百度地图的方法。调用百度地图，也是经过了几番周折

贴上显示代码，以免其他人调用百度地图走弯路。效果如下：

代码如下：

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">

<head>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>

    <title></title>

    <link rel="stylesheet" type="text/css" href="ol/ol3/css/ol.css" />

    <style type="text/css">

        body, #mainMap {

            border: 0px;

            margin: 0px;

            padding: 0px;

            width: 100%;

            height: 100%;

            font-size: 13px;

        }

    </style>

    <script type="text/javascript" src="ol/ol3/build/ol-debug.js"></script>

</head>

<body>

    <div id="mainMap">

    </div>

</body>

</html>

<script type="text/javascript">

    var projection = ol.proj.get("EPSG:3857");

    var resolutions = [];

    for (var i = 0; i < 19; i++) {

        resolutions[i] = Math.pow(2, 18 - i);

    }

    var tilegrid = new ol.tilegrid.TileGrid({

        origin: [0, 0],

        resolutions: resolutions

    });

    var baidu_source = new ol.source.TileImage({

        projection: projection,

        tileGrid: tilegrid,

        tileUrlFunction: function (tileCoord, pixelRatio, proj) {

            if (!tileCoord) {

                return "";

            }

            var z = tileCoord[0];

            var x = tileCoord[1];

            var y = tileCoord[2];

            if (x < 0) {

                x = "M" + (-x);

            }

            if (y < 0) {

                y = "M" + (-y);

            }

            return "http://online3.map.bdimg.com/onlinelabel/?qt=tile&x=" + x + "&y=" + y + "&z=" + z + "&styles=pl&udt=20151021&scaler=1&p=1";

        }

    });

    var baidu_layer = new ol.layer.Tile({

        source: baidu_source

    });

    var map = new ol.Map({

        target: 'mainMap',

        controls: ol.control.defaults().extend([

               new ol.control.MousePosition({ projection: 'EPSG:4326' })

        ]),

        layers: [baidu_layer],

        view: new ol.View({

            center: ol.proj.transform([104.06, 30.67], 'EPSG:4326', 'EPSG:3857'),

            zoom: 4

        })

    });

</script>