使用百度地图开发中碰到需要在地图上自定义选择某个区域,并且可以改变区域大小,然后进行某些操作。

这里用到了百度地图GL版的开源工具库BMapGLLib的自定义绘制功能,详情可查看https://github.com/huiyan-fe/BMapGLLib

code:

<!DOCTYPE html>
<html>
<head>
	<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
	<meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
	<script type="text/javascript" src="http://api.map.baidu.com/api?type=webgl&v=1.0&ak=您的密钥"></script>
    <link href="http://mapopen.cdn.bcebos.com/github/BMapGLLib/DrawingManager/src/DrawingManager.min.css" rel="stylesheet">
    <script type="text/javascript" src="http://mapopen.cdn.bcebos.com/github/BMapGLLib/DrawingManager/src/DrawingManager.min.js"></script>
    <title>鼠标绘制工具(GL)</title>
    <style type="text/css">
        body, html, #container {width: 100%; height: 100%; overflow: hidden; margin: 0; font-family: "微软雅黑";}
        ul li {list-style: none;}
        .info {
            z-index: 999;
            width: auto;
            min-width: 22rem;
            padding: .75rem 1.25rem;
            margin-left: 1.25rem;
            position: fixed;
            top: 1rem;
            background-color: #fff;
            border-radius: .25rem;
            font-size: 14px;
            color: #666;
            box-shadow: 0 2px 6px 0 rgba(27, 142, 236, 0.5);
        }
        .drawing-panel {
            z-index: 999;
            position: fixed;
            bottom: 3.5rem;
            margin-left: 2.5rem;
            padding-left: 0;
            border-radius: .25rem;
            height: 47px;
            box-shadow: 0 2px 6px 0 rgba(27, 142, 236, 0.5);
        }
        .bmap-btn {
            border-right: 1px solid #d2d2d2;
            float: left;
            width: 64px;
            height: 100%;
            background-image: url(//api.map.baidu.com/library/DrawingManager/1.4/src/bg_drawing_tool.png);
            cursor: pointer;
        }
        .drawing-panel .bmap-marker {
            background-position: -65px 0;
        }
        .drawing-panel .bmap-polyline {
            background-position: -195px 0;
        }
        .drawing-panel .bmap-rectangle {
            background-position: -325px 0;
        }
        .drawing-panel .bmap-polygon {
            background-position: -260px 0;
        }
        .drawing-panel .bmap-circle {
            background-position: -130px 0;
        }
    </style>
</head>
<body>
    <div class = "info">该示例实现基于JSAPI GL版的开源工具库,详情可查看https://github.com/huiyan-fe/BMapGLLib</div>
    <ul class = "drawing-panel">
        <li class="bmap-btn bmap-marker" id="marker" onclick="draw(this)"></li>
        <li class="bmap-btn bmap-polyline" id="polyline" onclick="draw(this)"></li>
        <li class="bmap-btn bmap-rectangle" id="rectangle" onclick="draw(this)"></li>
        <li class="bmap-btn bmap-polygon" id="polygon" onclick="draw(this)"></li>
        <li class="bmap-btn bmap-circle" id="circle" onclick="draw(this)"></li>
    </ul>
    <div id = "container"></div>
</body>
</html>
<script type="text/javascript">
    var map = new BMapGL.Map("container", {enableMapClick:false}); // 创建Map实例,GL版命名空间为BMapGL(鼠标右键控制倾斜角度)
	map.centerAndZoom(new BMapGL.Point(116.404, 39.915), 11);      // 初始化地图,设置中心点坐标和地图级别
    map.enableScrollWheelZoom(true);                               // 开启鼠标滚轮缩放

    var styleOptions = {
        strokeColor: '#5E87DB',   // 边线颜色
        fillColor: '#5E87DB',     // 填充颜色。当参数为空时,圆形没有填充颜色
        strokeWeight: 2,          // 边线宽度,以像素为单位
        strokeOpacity: 1,         // 边线透明度,取值范围0-1
        fillOpacity: 0.2          // 填充透明度,取值范围0-1
    };
    var labelOptions = {
        borderRadius: '2px',
        background: '#FFFBCC',
        border: '1px solid #E1E1E1',
        color: '#703A04',
        fontSize: '12px',
        letterSpacing: '0',
        padding: '5px'
    };

    // 实例化鼠标绘制工具
    var drawingManager = new BMapGLLib.DrawingManager(map, {
        // isOpen: true,        // 是否开启绘制模式
        enableCalculate: false, // 绘制是否进行测距测面
        enableSorption: true,   // 是否开启边界吸附功能
        sorptiondistance: 20,   // 边界吸附距离
        circleOptions: styleOptions,     // 圆的样式
        polylineOptions: styleOptions,   // 线的样式
        polygonOptions: styleOptions,    // 多边形的样式
        rectangleOptions: styleOptions,  // 矩形的样式
        labelOptions: labelOptions,      // label样式
    });  

    function draw(e) {
        var arr = document.getElementsByClassName('bmap-btn');
        for(var i = 0; i<arr.length; i++) {
            arr[i].style.backgroundPositionY = '0';
        }
        e.style.backgroundPositionY = '-52px';
        switch(e.id) {
            case 'marker': {
                var drawingType = BMAP_DRAWING_MARKER;
                break;
            }
            case 'polyline': {
                var drawingType = BMAP_DRAWING_POLYLINE;
                break;
            }
            case 'rectangle': {
                var drawingType = BMAP_DRAWING_RECTANGLE;
                break;
            }
            case 'polygon': {
                var drawingType = BMAP_DRAWING_POLYGON;
                break;
            }
            case 'circle': {
                var drawingType = BMAP_DRAWING_CIRCLE;
                break;
            }
        }
        // 进行绘制
        if (drawingManager._isOpen && drawingManager.getDrawingMode() === drawingType) {
            drawingManager.close();
        } else {
            drawingManager.setDrawingMode(drawingType);
            drawingManager.open();
        }
    };
    
</script>

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