//將地圖座標轉換成畫素        
    //基本引數開始
    MCBAND = [12890594.86, 8362377.87, 5591021, 3481989.83, 1678043.12, 0]
    LLBAND = [75, 60, 45, 30, 15, 0]
    MC2LL = [[1.410526172116255e-8, 0.00000898305509648872, -1.9939833816331, 200.9824383106796, -187.2403703815547, 91.6087516669843, -23.38765649603339, 2.57121317296198, -0.03801003308653, 17337981.2],
        [-7.435856389565537e-9, 0.000008983055097726239, -0.78625201886289, 96.32687599759846, -1.85204757529826, -59.36935905485877, 47.40033549296737, -16.50741931063887, 2.28786674699375, 10260144.86],
        [-3.030883460898826e-8, 0.00000898305509983578, 0.30071316287616, 59.74293618442277, 7.357984074871, -25.38371002664745, 13.45380521110908, -3.29883767235584, 0.32710905363475, 6856817.37],
        [-1.981981304930552e-8, 0.000008983055099779535, 0.03278182852591, 40.31678527705744, 0.65659298677277, -4.44255534477492, 0.85341911805263, 0.12923347998204, -0.04625736007561, 4482777.06],
        [3.09191371068437e-9, 0.000008983055096812155, 0.00006995724062, 23.10934304144901, -0.00023663490511, -0.6321817810242, -0.00663494467273, 0.03430082397953, -0.00466043876332, 2555164.4],
        [2.890871144776878e-9, 0.000008983055095805407, -3.068298e-8, 7.47137025468032, -0.00000353937994, -0.02145144861037, -0.00001234426596, 0.00010322952773, -0.00000323890364, 826088.5]]
    LL2MC = [[-0.0015702102444, 111320.7020616939, 1704480524535203, -10338987376042340, 26112667856603880, -35149669176653700, 26595700718403920, -10725012454188240, 1800819912950474, 82.5],
        [0.0008277824516172526, 111320.7020463578, 647795574.6671607, -4082003173.641316, 10774905663.51142, -15171875531.51559, 12053065338.62167, -5124939663.577472, 913311935.9512032, 67.5],
        [0.00337398766765, 111320.7020202162, 4481351.045890365, -23393751.19931662, 79682215.47186455, -115964993.2797253, 97236711.15602145, -43661946.33752821, 8477230.501135234, 52.5],
        [0.00220636496208, 111320.7020209128, 51751.86112841131, 3796837.749470245, 992013.7397791013, -1221952.21711287, 1340652.697009075, -620943.6990984312, 144416.9293806241, 37.5],
        [-0.0003441963504368392, 111320.7020576856, 278.2353980772752, 2485758.690035394, 6070.750963243378, 54821.18345352118, 9540.606633304236, -2710.55326746645, 1405.483844121726, 22.5],
        [-0.0003218135878613132, 111320.7020701615, 0.00369383431289, 823725.6402795718, 0.46104986909093, 2351.343141331292, 1.58060784298199, 8.77738589078284, 0.37238884252424, 7.45]]
    //基本引數結束        
    //轉換縮放級別
    var GetZoomUnits = function (zoom) {
        return Math.pow(2, (18 - zoom));
    }
    var FormatPoint = function (point) {
        var lng_lat, mc;
        point.lng = getLoop(point.lng, -180, 180);
        point.lat = getRange(point.lat, -74, 74);
        lng_lat = {
            lng: point.lng,
            lat: point.lat
        };
        for (var i = 0; i < LLBAND.length; i++) {
            if (lng_lat.lat >= LLBAND[i]) {
                mc = LL2MC[i];
                break
            }
        }
        if (!mc) {
            for (var i = LLBAND.length - 1; i >= 0; i--) {
                if (lng_lat.lat <= -LLBAND[i]) {
                    mc = LL2MC[i];
                    break
                }
            }
        }
        var cE = convertor(point, mc);
        var lng_lat = {
            lng: cE.lng.toFixed(2),
            lat: cE.lat.toFixed(2)
        };
        return lng_lat
    }
    var getLoop = function (lng, a, b) {
        while (lng > b) {
            lng -= b - a
        }
        while (lng < a) {
            lng += b - a
        }
        return lng
    }
    var getRange = function (lat, a, b) {
        if (a != null) {
            lat = Math.max(lat, a)
        }
        if (b != null) {
            lat = Math.min(lat, b)
        }
        return lat
    }
    var convertor = function (point, mc) {
        if (!point || !mc) {
            return
        }
        var lng = mc[0] + mc[1] * Math.abs(point.lng);
        var c = Math.abs(point.lat) / mc[9];
        var lat = mc[2] + mc[3] * c + mc[4] * c * c + mc[5] * c * c * c + mc[6] * c * c * c * c + mc[7] * c * c * c * c * c + mc[8] * c * c * c * c * c * c;
        lng *= (point.lng < 0 ? -1 : 1);
        lat *= (point.lat < 0 ? -1 : 1);
        return { lng: lng, lat: lat }
    };        
    //point:當前畫素 var point = new BMap.Point(x, y);
    //zoom:當前地圖縮放級別 var zoom = map.getZoom();
    //center:當前地圖可視範圍中心點座標 var center = map.getCenter();
    //bounds:地圖可視區域    var bound = map.getSize();    
    var PointToPixel = function (point, zoom, center, bounds) {
        // 座標到畫素
        if (!point) {
            return
        }
        point = FormatPoint(point);
        center = FormatPoint(center);
        var units = GetZoomUnits(zoom);
        var x = Math.round((point.lng - center.lng) / units + (parseInt(bounds.width)+2000) / 2);
        var y = Math.round((center.lat - point.lat) / units + (parseInt(bounds.height)+2000) / 2);
        return { x: x, y: y }
    }
    //  百度地圖定位座標資料
    var data_infoBeijing = [  
                         new BMap.Point(116.407854,39.921988),
                         new BMap.Point(116.466605,39.921585),
                         new BMap.Point(116.442222,39.912345),
                         new BMap.Point(116.497854,39.991988),
                         new BMap.Point(116.486605,39.921585),
                         new BMap.Point(116.502222,39.912345),
                         new BMap.Point(116.517854,39.921988),
                         new BMap.Point(116.526605,39.921585),
                         new BMap.Point(116.532222,39.912345),
                         new BMap.Point(116.547854,39.921988),
                         new BMap.Point(116.556605,39.921585),
                         new BMap.Point(116.562222,39.912345),
                         new BMap.Point(116.577854,39.921988),
                         new BMap.Point(116.586605,39.921585),
                         new BMap.Point(116.460947,39.877195),
                    ];
    var map = new BMap.Map("allmap",{enableMapClick: false});
    var point = data_infoBeijing[0];
    map.centerAndZoom(point, 13);
    var center = map.getCenter();//獲取地圖可視區域中心
    var bound = map.getSize();    //獲取地圖可視區域
    var width = bound.width+2000;       //畫布的寬度
    var height =bound.height+2000;   //畫布的高度    
    //畫布偏移量
    var left = width/2;
    //畫布偏移量    
    var topp = parseInt(height)/2;            
    // 複雜的自定義覆蓋物
    function ComplexCustomOverlay(point,one){
      this._point = point;
      this._one=one;
    }
    ComplexCustomOverlay.prototype = new BMap.Overlay();
    ComplexCustomOverlay.prototype.initialize = function(map){
      var thisMain=this;    
      this._map = map;
      //  建立地圖浮層
      var svg = this._svg = document.createElementNS("http://www.w3.org/2000/svg", "svg");      
      svg.style.zIndex = BMap.Overlay.getZIndex(this._point.lat);
      svg.style.MozUserSelect = "none";
      svg.setAttribute("version","1.1");
      svg.setAttribute("xmlns","http://www.w3.org/2000/svg")
      $(svg).css({"position":"absolute","height":height,"width":width,"z-index":"99","margin":"0","padding":"0"});
      $(svg).attr({"class":this._one});
      map.getPanes().labelPane.appendChild(svg);
      //  建立運動游標的圓      
      var circleAniamte=document.createElementNS("http://www.w3.org/2000/svg", "circle");
      circleAniamte.setAttribute("r","1");
      circleAniamte.setAttribute("fill","yellow");
      circleAniamte.setAttribute("stroke","yellow");
      circleAniamte.setAttribute("stroke-width","5");
      svg.appendChild(circleAniamte);      
      var arrZ=[];
      var p=1;
      function pathMap(){
        arrZ[0]=data_infoBeijing[p-1];
        arrZ[1]=data_infoBeijing[p];    
        var a= PointToPixel(arrZ[0],13, center, bound)
        var b= PointToPixel(arrZ[1],13, center, bound)
        map.centerAndZoom(arrZ[0], 13); // 改變地圖中心點
        // 線的長度
        var long = thisMain.routeLong(a.x,a.y,b.x,b.y);
        var runTime = long/0.1;
        //  運動游標圓的軌跡
        circleAniamte.setAttribute("cx",a.x);
        circleAniamte.setAttribute("cy",a.y);        
        $(circleAniamte).animate({"cx":b.x,"cy":b.y},runTime,'linear',function(){
                if(p>=data_infoBeijing.length){
                    thisMain.cir(b.x,b.y,svg);
                };
        });  
        //  建立線型運動軌跡
        thisMain.pointLineAnimation(a.x,a.y,b.x,b.y,p,runTime,svg);
        // 建立圓拐點
        thisMain.cir(a.x,a.y,svg);        
        p++;
        if(p<data_infoBeijing.length){
            setTimeout(pathMap,runTime)
        };
    };        
    pathMap()        
    };
    //兩個ap之間的距離
    ComplexCustomOverlay.prototype.routeLong=function(ax,ay,bx,by){
        var x = ax-bx;            
        var y = ay-by;
        return Math.floor(Math.sqrt((x*x+y*y)));
    };    
    //  建立動畫軌跡
    ComplexCustomOverlay.prototype.pointLineAnimation=function(ax,ay,bx,by,p,runTime,svg){
        //  建立線型運動軌跡
        var pat=document.createElementNS("http://www.w3.org/2000/svg", "path");
        pat.setAttribute("d","M"+ax+","+ay+" L"+bx+","+by);
        pat.setAttribute("fill","none");
        pat.setAttribute("stroke","yellow");
        pat.setAttribute("stroke-width","3");
        pat.setAttribute("class","abc"+p);
        $(pat).attr({"abc":"12345"})
        svg.appendChild(pat);
        // 運動軌跡距離長度        
        var aa=document.querySelector('.abc'+p).getTotalLength();
        pat.setAttribute("stroke-opacity","1");
        pat.setAttribute("stroke-dasharray",aa);
        pat.setAttribute("stroke-dashoffset",aa);
        pat.style.animation="dash "+runTime/1000+"s linear forwards";         
    }        
    //  建立轉折點圓
    ComplexCustomOverlay.prototype.cir=function(ax,ay,svg){
        var circle=document.createElementNS("http://www.w3.org/2000/svg", "circle");
        circle.setAttribute("r","4");
        circle.setAttribute("cx",ax);
        circle.setAttribute("cy",ay);
        circle.setAttribute("fill","none");
        circle.setAttribute("stroke","green");
        circle.setAttribute("stroke-width","3");
        svg.appendChild(circle);
    }    
    // 相對定位移動浮層位置
    ComplexCustomOverlay.prototype.draw = function(){
      var map = this._map;
      var pixel = map.pointToOverlayPixel(this._point);
      this._svg.style.left = pixel.x-left+ "px";
      this._svg.style.top  = pixel.y-topp+"px";
    };        
    // 新增到地圖
    var cla="disp"+2;
    var myCompOverlaythree = new ComplexCustomOverlay(data_infoBeijing[0],cla);
    map.addOverlay(myCompOverlaythree);       
    // 改變地圖背景樣式
    function changeMapStyle(style){
        map.setMapStyle({style:style});
    };
    changeMapStyle("midnight");  // 改變背景顏色

    map.enableScrollWheelZoom();   //啟用滾輪放大縮小，預設禁用