概述
本文讲述OL3结合echart，实现echart中的炫酷特效。
效果
echart3
echart2
说明：
1、echart3中特效没出来，找了半天原因，还未搞定，感兴趣的可以一起看看。
思路
1、通过OL3种屏幕坐标和地理坐标的相互转换，实现echatt在地图中的展示；
2、通过监控view的propertychange和map的zoomend实现echart的更新；
关键代码
1、屏幕坐标转换
function getEchartCord(){
var geoPoints = {
'上海': [121.4648,31.2891],
'东莞': [113.8953,22.901],
'东营': [118.7073,37.5513],
'中山': [113.4229,22.478],
'临汾': [111.4783,36.1615],
'临沂': [118.3118,35.2936],
'丹东': [124.541,40.4242],
'丽水': [119.5642,28.1854],
'乌鲁木齐': [87.9236,43.5883],
'佛山': [112.8955,23.1097],
'保定': [115.0488,39.0948],
'兰州': [103.5901,36.3043],
'包头': [110.3467,41.4899],
'北京': [116.4551,40.2539],
'北海': [109.314,21.6211],
'南京': [118.8062,31.9208],
'南宁': [108.479,23.1152],
'南昌': [116.0046,28.6633],
'南通': [121.1023,32.1625],
'厦门': [118.1689,24.6478],
'台州': [121.1353,28.6688],
'合肥': [117.29,32.0581],
'呼和浩特': [111.4124,40.4901],
'咸阳': [108.4131,34.8706],
'哈尔滨': [127.9688,45.368],
'唐山': [118.4766,39.6826],
'嘉兴': [120.9155,30.6354],
'大同': [113.7854,39.8035],
'大连': [122.2229,39.4409],
'天津': [117.4219,39.4189],
'太原': [112.3352,37.9413],
'威海': [121.9482,37.1393],
'宁波': [121.5967,29.6466],
'宝鸡': [107.1826,34.3433],
'宿迁': [118.5535,33.7775],
'常州': [119.4543,31.5582],
'广州': [113.5107,23.2196],
'廊坊': [116.521,39.0509],
'延安': [109.1052,36.4252],
'张家口': [115.1477,40.8527],
'徐州': [117.5208,34.3268],
'德州': [116.6858,37.2107],
'惠州': [114.6204,23.1647],
'成都': [103.9526,30.7617],
'扬州': [119.4653,32.8162],
'承德': [117.5757,41.4075],
'拉萨': [91.1865,30.1465],
'无锡': [120.3442,31.5527],
'日照': [119.2786,35.5023],
'昆明': [102.9199,25.4663],
'杭州': [119.5313,29.8773],
'枣庄': [117.323,34.8926],
'柳州': [109.3799,24.9774],
'株洲': [113.5327,27.0319],
'武汉': [114.3896,30.6628],
'汕头': [117.1692,23.3405],
'江门': [112.6318,22.1484],
'沈阳': [123.1238,42.1216],
'沧州': [116.8286,38.2104],
'河源': [114.917,23.9722],
'泉州': [118.3228,25.1147],
'泰安': [117.0264,36.0516],
'泰州': [120.0586,32.5525],
'济南': [117.1582,36.8701],
'济宁': [116.8286,35.3375],
'海口': [110.3893,19.8516],
'淄博': [118.0371,36.6064],
'淮安': [118.927,33.4039],
'深圳': [114.5435,22.5439],
'清远': [112.9175,24.3292],
'温州': [120.498,27.8119],
'渭南': [109.7864,35.0299],
'湖州': [119.8608,30.7782],
'湘潭': [112.5439,27.7075],
'滨州': [117.8174,37.4963],
'潍坊': [119.0918,36.524],
'烟台': [120.7397,37.5128],
'玉溪': [101.9312,23.8898],
'珠海': [113.7305,22.1155],
'盐城': [120.2234,33.5577],
'盘锦': [121.9482,41.0449],
'石家庄': [114.4995,38.1006],
'福州': [119.4543,25.9222],
'秦皇岛': [119.2126,40.0232],
'绍兴': [120.564,29.7565],
'聊城': [115.9167,36.4032],
'肇庆': [112.1265,23.5822],
'舟山': [122.2559,30.2234],
'苏州': [120.6519,31.3989],
'莱芜': [117.6526,36.2714],
'菏泽': [115.6201,35.2057],
'营口': [122.4316,40.4297],
'葫芦岛': [120.1575,40.578],
'衡水': [115.8838,37.7161],
'衢州': [118.6853,28.8666],
'西宁': [101.4038,36.8207],
'西安': [109.1162,34.2004],
'贵阳': [106.6992,26.7682],
'连云港': [119.1248,34.552],
'邢台': [114.8071,37.2821],
'邯郸': [114.4775,36.535],
'郑州': [113.4668,34.6234],
'鄂尔多斯': [108.9734,39.2487],
'重庆': [107.7539,30.1904],
'金华': [120.0037,29.1028],
'铜川': [109.0393,35.1947],
'银川': [106.3586,38.1775],
'镇江': [119.4763,31.9702],
'长春': [125.8154,44.2584],
'长沙': [113.0823,28.2568],
'长治': [112.8625,36.4746],
'阳泉': [113.4778,38.0951],
'青岛': [120.4651,36.3373],
'韶关': [113.7964,24.7028]
};
var scrPoints = {};
for(var city in geoPoints){
var webPoint = ol.proj.transform(geoPoints[city], 'EPSG:4326', 'EPSG:3857');
var scrPoint = map.getPixelFromCoordinate(webPoint);
scrPoints[city] = scrPoint;
}
return scrPoints;
}2、事件监控
var view = map.getView();
view.on('propertychange',function(){
$(".chart").remove();
});
map.on("moveend",function(){
addChart();
})
addChart();
}3、生成图表 var myChart;
function addChart(){
require(
[
'echarts',
'echarts/chart/map'
],
function (ec) {
var chartDiv = $("<div/>").addClass("chart");
var mapDiv = $("#map").children()[0];
$(mapDiv).append(chartDiv);
// 基于准备好的dom，初始化echarts图表
myChart = ec.init(chartDiv[0]);
var option = getEchartOption();
myChart.setOption(option);
}
);
}
function getEchartOption(){
var scrPoints = getEchartCord();
return {
"color": [
"gold",
"aqua",
"lime"
],
"tooltip": {
"trigger": "item",
"formatter": "{b}"
},
"series": [
{
"name": "北京 Top10",
"type": "map",
"mapType": "none",
"roam": false,
"data": [],
"markLine": {
"smooth": true,
"effect": {
"show": true,
"scaleSize": 1,
"period": 30,
"color": "#fff",
"shadowBlur": 10
},
"itemStyle": {
"normal": {
"borderWidth": 1,
"lineStyle": {
"type": "solid",
"shadowBlur": 10
}
}
},
"data": [
[
{
"name": "北京",
"x": scrPoints["北京"][0],
"y": scrPoints["北京"][1]
},
{
"name": "上海",
"value": 95,
"x": scrPoints["上海"][0],
"y": scrPoints["上海"][1]
}
],
[
{
"name": "北京",
"x": scrPoints["北京"][0],
"y": scrPoints["北京"][1]
},
{
"name": "广州",
"value": 90,
"x": scrPoints["广州"][0],
"y": scrPoints["广州"][1]
}
],
[
{
"name": "北京",
"x": scrPoints["北京"][0],
"y": scrPoints["北京"][1]
},
{
"name": "大连",
"value": 80,
"x": scrPoints["大连"][0],
"y": scrPoints["大连"][1]
}
],
[
{
"name": "北京",
"x": scrPoints["北京"][0],
"y": scrPoints["北京"][1]
},
{
"name": "南宁",
"value": 70,
"x": scrPoints["南宁"][0],
"y": scrPoints["南宁"][1]
}
],
[
{
"name": "北京",
"x": scrPoints["北京"][0],
"y": scrPoints["北京"][1]
},
{
"name": "南昌",
"value": 60,
"x": scrPoints["南昌"][0],
"y": scrPoints["南昌"][1]
}
],
[
{
"name": "北京",
"x": scrPoints["北京"][0],
"y": scrPoints["北京"][1]
},
{
"name": "拉萨",
"value": 50,
"x": scrPoints["拉萨"][0],
"y": scrPoints["拉萨"][1]
}
],
[
{
"name": "北京",
"x": scrPoints["北京"][0],
"y": scrPoints["北京"][1]
},
{
"name": "长春",
"value": 40,
"x": scrPoints["长春"][0],
"y": scrPoints["长春"][1]
}
],
[
{
"name": "北京",
"x": scrPoints["北京"][0],
"y": scrPoints["北京"][1]
},
{
"name": "包头",
"value": 30,
"x": scrPoints["包头"][0],
"y": scrPoints["包头"][1]
}
],
[
{
"name": "北京",
"x": scrPoints["北京"][0],
"y": scrPoints["北京"][1]
},
{
"name": "重庆",
"value": 20,
"x": scrPoints["重庆"][0],
"y": scrPoints["重庆"][1]
}
],
[
{
"name": "北京",
"x": scrPoints["北京"][0],
"y": scrPoints["北京"][1]
},
{
"name": "常州",
"value": 10,
"x": scrPoints["常州"][0],
"y": scrPoints["常州"][1]
}
]
]
},
"markPoint": {
"symbol": "emptyCircle",
"effect": {
"show": true,
"shadowBlur": 0
},
"itemStyle": {
"normal": {
"label": {
"show": false
}
},
"emphasis": {
"label": {
"position": "top"
}
}
},
"data": [
{
"name": "上海",
"value": 95,
"x": scrPoints["上海"][0],
"y": scrPoints["上海"][1]
},
{
"name": "广州",
"value": 90,
"x": scrPoints["广州"][0],
"y": scrPoints["广州"][1]
},
{
"name": "大连",
"value": 80,
"x": scrPoints["大连"][0],
"y": scrPoints["大连"][1]
},
{
"name": "南宁",
"value": 70,
"x": scrPoints["南宁"][0],
"y": scrPoints["南宁"][1]
},
{
"name": "南昌",
"value": 60,
"x": scrPoints["南昌"][0],
"y": scrPoints["南昌"][1]
},
{
"name": "拉萨",
"value": 50,
"x": scrPoints["拉萨"][0],
"y": scrPoints["拉萨"][1]
},
{
"name": "长春",
"value": 40,
"x": scrPoints["长春"][0],
"y": scrPoints["长春"][1]
},
{
"name": "包头",
"value": 30,
"x": scrPoints["包头"][0],
"y": scrPoints["包头"][1]
},
{
"name": "重庆",
"value": 20,
"x": scrPoints["重庆"][0],
"y": scrPoints["重庆"][1]
},
{
"name": "常州",
"value": 10,
"x": scrPoints["常州"][0],
"y": scrPoints["常州"][1]
}
]
}
}
]
};
}---------------------------------------------------------------------------------------------------------------
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