使用百度地图实现地图网格

2018-06-24 01:30:04来源:未知 阅读 ()

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前言:最近要使用百度地图实现楼盘可视化的功能,因此最基础的功能就是将地图网格化以后实现不同地域的楼盘划分;

1,自行去百度地图的开放平台申请秘钥哈,这里我就把自己的秘钥贴出来了;ak=A3CklGvnFOjkAzKzay2dySgfdig0GKz4

2,新建一个简单页面,下面我把自己的页面贴出来

<!DOCTYPE html>
<html>
<head>
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no"/>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
    <style type="text/css">
        html {
            height: 100%
        }

        body {
            height: 100%;
            margin: 0px;
            padding: 0px
        }

        #container {
            height: 100%
        }
    </style>
    <script type="text/javascript" src="http://api.map.baidu.com/api?v=2.0&ak=A3CklGvnFOjkAzKzay2dySgfdig0GKz4"></script> 
<script type="text/javascript" src="ziroom-map.js"></script>
 </head>
 <body> 
<div id="container"></div>
 <script> 
var myMap = new ZMap("container"); </script>
 </body>
 </html>

3,其中引入了ziroom-map.js,这是我们公司的名字啦,我把代码贴出来,这个js是封装了百度的js的api的,有人如果要问为什么封装,直接使用不可以么?那我的回答是:封装可以将具体业务和地图相结合,使代码更清晰,并且可以持久化当前地图的状态,利于实现对地图的操作。

var ZMap = function (id, center, level) {
    this.initCenter = new ZPoint(116.404, 39.915);//初始化的中心点,同时为了定义网格的中心点
    this.id = id;//div的id
    this.level = level ? level : 13;//地图级别
    this.center = center ? center : this.initCenter;//中心点

    this.map = null;//百度地图实例
    this.xgrids = [];//经线
    this.ygrids = [];//纬线
    this.beSelectBounds = {};
    this.bounds = null;//当前地图的四个顶点
    this.span = null;//当前网格的跨度

    this.init();

}
ZMap.prototype = {
    init: function () {//全局初始化
        var zMap = this;
        this.map = new BMap.Map(this.id);
        this.map.centerAndZoom(this.center.point, this.level);
        this.map.enableScrollWheelZoom();
        this.map.disableInertialDragging();
        this.map.addControl(new BMap.NavigationControl({
            anchor: BMAP_ANCHOR_BOTTOM_RIGHT,
            type: BMAP_NAVIGATION_CONTROL_ZOOM
        })); //缩放按钮
        this.map.addControl(new BMap.ScaleControl({anchor: BMAP_ANCHOR_BOTTOM_LEFT, offset: new BMap.Size(80, 25)})); //比例尺
        this.map.disableDoubleClickZoom();
        this.map.setMapStyle({style: 'googlelite'});
        this.initProperty();
        this.initGrid();

        //添加移动后的点击事件
        this.map.addEventListener("dragend", function () {
            zMap.initProperty();
            zMap.initGrid();
        });
        //添加放大或缩小时的事件
        this.map.addEventListener("zoomend", function () {
            zMap.initProperty();
            zMap.initGrid();
        });
        //设置点击事件
        this.map.addEventListener("click", function (e) {
            var point = e.point;
            //获取当前点是在哪个区块内,获取正方形的四个顶点
            var points = zMap.getGrid(point);

            //判断当前区域是否已经被选中过,如果被选中过则取消选中
            var key = '' + points[0].lng + points[0].lat + points[2].lng + points[2].lat;//使用两个点的坐标作为key
            if (zMap.beSelectBounds[key]) {
                zMap.map.removeOverlay(zMap.beSelectBounds[key]);
                delete zMap.beSelectBounds[key];
                return;
            }
            var polygon = new BMap.Polygon(points, {strokeColor: "red", strokeWeight: 2, strokeOpacity: 0.5});
            zMap.map.addOverlay(polygon);
            zMap.beSelectBounds[key] = polygon;

        });
    },
    initProperty: function () {//初始化当前地图的状态
        this.level = this.map.getZoom();
        this.bounds = {
            x1: this.map.getBounds().getSouthWest().lng,
            y1: this.map.getBounds().getSouthWest().lat,
            x2: this.map.getBounds().getNorthEast().lng,
            y2: this.map.getBounds().getNorthEast().lat
        };
        this.span = this.getSpan();//需要使用level属性
    },
    initGrid: function () {//初始化网格
        var zMap = this;
        //将原来的网格线先去掉
        for (var i in zMap.xgrids) {
            this.map.removeOverlay(zMap.xgrids[i]);
        }
        zMap.xgrids = [];
        for (var i in zMap.ygrids) {
            this.map.removeOverlay(zMap.ygrids[i]);
        }
        zMap.ygrids = [];
        //获取当前网格跨度
        var span = zMap.span;
        //初始化地图上的网格
        for (var i = zMap.bounds.x1 + (zMap.initCenter.point.lng - zMap.bounds.x1) % span.x - span.x; i < zMap.bounds.x2 + span.x; i += span.x) {
            var polyline = new BMap.Polyline([
                new BMap.Point(i.toFixed(6), zMap.bounds.y1),
                new BMap.Point(i.toFixed(6), zMap.bounds.y2)
            ], {strokeColor: "black", strokeWeight: 1, strokeOpacity: 0.5});
            zMap.xgrids.push(polyline);
            zMap.map.addOverlay(polyline);
        }
        for (var i = zMap.bounds.y1 + (zMap.initCenter.point.lat - zMap.bounds.y1) % span.y - span.y; i < zMap.bounds.y2 + span.y; i += span.y) {
            var polyline = new BMap.Polyline([
                new BMap.Point(zMap.bounds.x1, i.toFixed(6)),
                new BMap.Point(zMap.bounds.x2, i.toFixed(6))
            ], {strokeColor: "black", strokeWeight: 1, strokeOpacity: 0.5});
            zMap.ygrids.push(polyline);
            zMap.map.addOverlay(polyline);
        }
    },
    getSpan: function () {//获取网格的跨度
        var scale = 0.75;
        var x = 0.00064;
        for (var i = this.level; i < 19; i++) {
            x *= 2;
        }
        var y = parseFloat((scale * x).toFixed(5));
        return {x: x, y: y};
    },
    getGrid: function (point) {//返回当前点在所在区块的四个顶点
        var zMap = this;
        //先找出两条纵线坐标
        var xpoints = this.xgrids.map(function (polyline) {
            return polyline.getPath()[0].lng;
        }).filter(function (lng) {
            return Math.abs(lng - point.lng) <= zMap.span.x;
        }).sort(function (a, b) {
            return a - b;
        }).slice(0, 2);

        //再找出两条横线的坐标
        var ypoints = this.ygrids.map(function (polyline) {
            return polyline.getPath()[0].lat;
        }).filter(function (lat) {
            return Math.abs(lat - point.lat) <= zMap.span.y;
        }).sort(function (a, b) {
            return a - b;
        }).slice(0, 2);

        return [
            new BMap.Point(xpoints[0], ypoints[0]),
            new BMap.Point(xpoints[0], ypoints[1]),
            new BMap.Point(xpoints[1], ypoints[1]),
            new BMap.Point(xpoints[1], ypoints[0])
        ];

    },
    reset: function () {//重置
        this.map.reset();
    }
}

var ZPoint = function (x, y, code) {
    this.code = code;
    this.point = new BMap.Point(x, y);
}

总结:好了这篇随笔就这么多了,欢迎大家指正。

 

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