// 初始化地图

var BMapExt = new BMapExtension(domMain, BMap, require('echarts'), require('zrender'));

var map = BMapExt.getMap();

var container = BMapExt.getEchartsContainer();

var point = new BMap.Point(startPoint.x, startPoint.y);

map.centerAndZoom(point, 5);

map.enableScrollWheelZoom(true);

option = {

    color: ['gold','aqua','lime'],

    title : {

        text: '模拟迁徙',

        subtext:'数据纯属虚构',

        x:'right'

    },

    tooltip : {

        trigger: 'item',

        formatter: function (v) {

            return v[1].replace(':', ' > ');

        }

    },

    legend: {

        orient: 'vertical',

        x:'left',

        data:['北京', '上海', '广州'],

        selectedMode: 'single',

        selected:{

            '上海' : false,

            '广州' : false

        }

    },

    toolbox: {

        show : true,

        orient : 'vertical',

        x: 'right',

        y: 'center',

        feature : {

            mark : {show: true},

            dataView : {show: true, readOnly: false},

            restore : {show: true},

            saveAsImage : {show: true}

        }

    },

    dataRange: {