前言：最近要使用百度地圖實現樓盤可視化的功能，因此最基礎的功能就是將地圖網格化以后實現不同地域的樓盤劃分；
1，自行去百度地圖的開放平臺申請秘鑰哈，這里我就把自己的秘鑰貼出來了；ak=A3CklGvnFOjkAzKzay2dySgfdig0GKz4
2，新建一個簡單頁面，下面我把自己的頁面貼出來
<!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，這是我們公司的名字啦，我把代碼貼出來，這個js是封裝了百度的js的api的，有人如果要問為什么封裝，直接使用不可以么？那我的回答是：封裝可以將具體業務和地圖相結合，使代碼更清晰，并且可以持久化當前地圖的狀態，利于實現對地圖的操作。
var ZMap = function (id, center, level) { this.initCenter = new ZPoint(116.404, 39.915);//初始化的中心點，同時為了定義網格的中心點 this.id = id;//div的id this.level = level ? level : 13;//地圖級別 this.center = center ? center : this.initCenter;//中心點 this.map = null;//百度地圖實例 this.xgrids = [];//經線 this.ygrids = [];//緯線 this.beSelectBounds = {}; this.bounds = null;//當前地圖的四個頂點 this.span = null;//當前網格的跨度 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 })); //縮放按鈕 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(); //添加移動后的點擊事件 this.map.addEventListener("dragend", function () { zMap.initProperty(); zMap.initGrid(); }); //添加放大或縮小時的事件 this.map.addEventListener("zoomend", function () { zMap.initProperty(); zMap.initGrid(); }); //設置點擊事件 this.map.addEventListener("click", function (e) { var point = e.point; //獲取當前點是在哪個區塊內,獲取正方形的四個頂點 var points = zMap.getGrid(point); //判斷當前區域是否已經被選中過，如果被選中過則取消選中 var key = '' + points[0].lng + points[0].lat + points[2].lng + points[2].lat;//使用兩個點的坐標作為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 () {//初始化當前地圖的狀態 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屬性 }, initGrid: function () {//初始化網格 var zMap = this; //將原來的網格線先去掉 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 = []; //獲取當前網格跨度 var span = zMap.span; //初始化地圖上的網格 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 () {//獲取網格的跨度 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) {//返回當前點在所在區塊的四個頂點 var zMap = this; //先找出兩條縱線坐標 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); //再找出兩條橫線的坐標 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);}
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