定位点

使用SimpleMarker，指定其锚点的位置。

源代码编辑器
<!-- 重点参数：showPositionPoint -->
<!doctype html>
<html lang="zh-CN">

<head>
    <!-- 原始地址：//webapi.amap.com/ui/1.0/ui/overlay/SimpleMarker/examples/position-point.html -->
    <base href="//webapi.amap.com/ui/1.1/ui/overlay/SimpleMarker/examples/" />
    <meta charset="utf-8">
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no, width=device-width">
    <title>定位点</title>
    <style>
    html,
    body,
    #container {
        width: 100%;
        height: 100%;
        margin: 0px;
    }
    </style>
</head>

<body>
    <div id="container"></div>
    <script type="text/javascript" src='//webapi.amap.com/maps?v=2.0&key=您申请的key值'></script>
    <!-- UI组件库 1.0 -->
    <script src="//webapi.amap.com/ui/1.1/main.js?v=1.1.1"></script>
    <script type="text/javascript">
    var map = new AMap.Map('container', {
        zoom: 4
    });

    AMapUI.loadUI(['overlay/SimpleMarker'], function(SimpleMarker) {

        var lngLats = getGridLngLats(map.getCenter(), 2, 2, 100);


        new SimpleMarker({
            //显示定位基点
            showPositionPoint: true,

            iconStyle: 'black',
            map: map,
            position: lngLats[0]
        });

        new SimpleMarker({
            showPositionPoint: {
                color: 'green',
                radius: 5
            },

            iconStyle: 'purple',
            map: map,
            position: lngLats[1]
        });

    });

    AMap.plugin(['AMap.ToolBar'], function() {
        map.addControl(new AMap.ToolBar({
            map: map
        }));
    });

    /**
     * 返回一批网格排列的经纬度

     * @param  {AMap.LngLat} center 网格中心
     * @param  {number} colNum 列数
     * @param  {number} size  总数
     * @param  {number} cellX  横向间距
     * @param  {number} cellY  竖向间距
     * @return {Array}  返回经纬度数组
     */
    function getGridLngLats(center, colNum, size, cellX, cellY) {

        var pxCenter = map.lnglatToPixel(center);

        var rowNum = Math.ceil(size / colNum);

        var startX = pxCenter.getX(),
            startY = pxCenter.getY();

        cellX = cellX || 70;

        cellY = cellY || 70;


        var lngLats = [];

        for (var r = 0; r < rowNum; r++) {

            for (var c = 0; c < colNum; c++) {

                var x = startX + (c - (colNum - 1) / 2) * (cellX);

                var y = startY + (r - (rowNum - 1) / 2) * (cellY);

                lngLats.push(map.pixelToLngLat(new AMap.Pixel(x, y)));

                if (lngLats.length >= size) {
                    break;
                }
            }
        }
        return lngLats;
    }
    </script>
</body>

</html>
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