本篇的重点内容是利用openlayers实现迁徙图功能，效果图如下：
image
实现思路
- 迁徙图界面设计
//迁徙图
"<div style='height:25px;background:#30A4D5;margin-top:10px;width: 98%;margin-left: 3px;float: left;'>" +
"<span style='margin-left:5px;font-size: 13px;color:white;'>迁徙图</span>" +
"</div>" +
'<div id="moveEchartsLayer" style="padding:5px;float: left;">' +
'<input type="checkbox" name="moveechartslayer" id="moveechartslayer1" style="width: 15px;height: 15px;vertical-align: middle;margin: auto;"/>' +
'<label style="font-weight: normal;vertical-align: middle;margin: auto;">迁徙图</label>' +
'</div>'
- 迁徙图点击事件
//迁徙图
$("#moveEchartsLayer input").bind("click", function () { if (this.checked) { if(!bxmap.olEchartsLayer.isLoad){
bxmap.olEchartsLayer.Init(bmap);
}else{
bxmap.olEchartsLayer.loadEchartsLayer();
}
} else {
bxmap.olEchartsLayer.removeEchartsLayer();
}
})
- 迁徙图模拟数据源
var move_option = {
color: ["gold","aqua","lime"],
tooltip : {
trigger: "item",
formatter: "{b}" },
toolbox: {
show : false,
orient : "vertical",
x: "right",
y: "center",
feature : {
mark : {show: true},
dataView : {show: true, readOnly: false},
restore : {show: true},
saveAsImage : {show: true}
}
},
dataRange: {
show : false,
min : 0,
max : 100,
calculable : true,
color: ["#ff3333"],
textStyle:{
color:"#fff" }
},
series : [
{
name: "嘉善县",
type: "map",
roam: true,
hoverable: false,
mapType: "none",
itemStyle:{
normal:{
borderColor:"rgba(100,149,237,1)",
borderWidth:0.5,
areaStyle:{
color: "#1b1b1b" }
}
},
data:[],
markLine : {
smooth:true,
symbol: ["circle", "circle"],
symbolSize : 1,
itemStyle : {
normal: {
color:"#fff",
borderWidth:1,
borderColor:"rgba(30,144,255,0.5)" }
},
data : [
[{name:"海宁市"},{name:"嘉善县"}],
[{name:"南湖区"},{name:"嘉善县"}],
[{name:"秀洲区"},{name:"嘉善县"}],
[{name:"海盐县"},{name:"嘉善县"}],
[{name:"平湖市"},{name:"嘉善县"}],
[{name:"嘉善县"},{name:"嘉善县"}]
],
},
geoCoord: { "海宁市": [120.492, 30.4186], "南湖区": [120.84, 30.8224], "秀洲区": [120.805, 30.9241], "海盐县": [121.043, 30.7042], "平湖市": [120.835, 30.529], "桐乡市": [120.476, 30.6122], "嘉善县":[120.994, 30.8826]
}
},
{
name: "粤港澳 Top10",
type: "map",
mapType: "none",
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:"南湖区"}, {name:"嘉善县"}],
[{name:"秀洲区"}, {name:"嘉善县"}],
[{name:"海盐县"}, {name:"嘉善县"}],
[{name:"平湖市"}, {name:"嘉善县"}],
[{name:"海宁市"}, {name:"嘉善县"}],
[{name:"桐乡市"}, {name:"嘉善县"}]
]
},
markPoint : {
symbol:"emptyCircle",
symbolSize : function (v){ return 10 + v/10
},
effect : {
show: true,
shadowBlur : 0 },
itemStyle:{
normal:{
label:{show:false},
color: '#f4e925',
shadowBlur: 10,
shadowColor: '#333' },
emphasis: {
label:{position:"top"}
}
},
data : [
{name:"海宁市",value:25},
{name:"南湖区",value:60},
{name:"秀洲区",value:95},
{name:"海盐县",value:120},
{name:"平湖市",value:105},
{name:"桐乡市",value:70}
]
}
}
]
};
- 迁徙图初始化以及核心代码实现
var bxmap = bxmap || {};
bxmap.olEchartsLayer = {
map:null,
isLoad:false,
olMapExt:null,
Init:function(bmap){ this.map = bmap.getMap(); this.isLoad = true; //加载移动流向图效果
this.loadEchartsLayer();
},
hideEchartsLayer:function(){
$("#markline_EchartMap").hide();
},
showEchartsLayer:function(){
$("#markline_EchartMap").show(); //地图跳转范围
this.map.getView().setCenter([12849981.699040852, 2498879.3286656872]); this.map.getView().setZoom(6);
},
removeEchartsLayer:function(){ if(this.olMapExt) this.olMapExt.clear();
},
loadEchartsLayer:function(){ //加载移动流向图效果
var olMapExt = this.olMapExt = new OpenLayer3Ext(this.map, echarts2); var container = olMapExt.getEchartsContainer(); var myChart = olMapExt.initECharts(container);
window.onresize = myChart.resize;
olMapExt.setOption(move_option, true); //地图跳转范围
this.map.getView().setCenter([13442168.534000002,3599400.8270378476]); this.map.getView().setZoom(10);
}
}
/**
* echarts 百度地图扩展，必须在echarts初始化前使用
*
* @desc echarts基于Canvas，纯Javascript图表库，提供直观，生动，可交互，可个性化定制的数据统计图表。 */
/**
* 构造函数
*
* @param {String|HTMLElement|ol.Map} obj
* @param {echarts} ec
* @constructor */
function OpenLayer3Ext(map,ec) { this._map=map; var size = map.getSize(); var div = this._echartsContainer = document.createElement('div');
div.style.position = 'absolute';
div.style.height = size[1] + 'px';
div.style.width = size[0] + 'px';
div.id = 'markline_EchartMap';
div.style.top = 0;
div.style.left = 0;
map.getViewport().appendChild(div); this._init(map,ec);
}; /**
* echarts 容器元素
*
* @type {HTMLElement}
* @private */ OpenLayer3Ext.prototype._echartsContainer = null; /**
* ol地图实例
*
* @type {BMap.Map}
* @private */ OpenLayer3Ext.prototype._map = null; /**
* 使用的echarts实例
*
* @type {ECharts}
* @private */ OpenLayer3Ext.prototype._ec = null; /**
* geoCoord
*
* @type {Object}
* @private */ OpenLayer3Ext.prototype._geoCoord = []; /**
* 记录地图的便宜量
*
* @type {Array.<number>}
* @private */ OpenLayer3Ext.prototype._mapOffset = [0, 0]; /**
* 初始化方法
*
* @param {String|HTMLElement|ol.Map} obj
* @param {BMap} BMap
* @param {echarts} ec
* @private */ OpenLayer3Ext.prototype._init = function (map,ec) { var self = this;
self._map = map; /**
* 获取echarts容器
*
* @return {HTMLElement}
* @public */ self.getEchartsContainer = function () { return self._echartsContainer;
}; /**
* 获取map实例
*
* @return {BMap.Map}
* @public */ self.getMap = function () { return self._map;
} /**
* 经纬度转换为屏幕像素
*
* @param {Array.<number>} geoCoord 经纬度
* @return {Array.<number>}
* @public */ self.geoCoord2Pixel = function (geoCoord) { return self._map.getPixelFromCoordinate(ol.proj.fromLonLat(geoCoord));
}; /**
* 屏幕像素转换为经纬度
*
* @param {Array.<number>} pixel 像素坐标
* @return {Array.<number>}
* @public */ self.pixel2GeoCoord = function (pixel) { return self._map.getCoordinateFromPixel(pixel);
}; /**
* 初始化echarts实例
*
* @return {ECharts}
* @public */ self.initECharts = function () {
self._ec = ec.init.apply(self, arguments);
self._bindEvent();
self._addMarkWrap(); return self._ec;
}; // addMark wrap for get position from baidu map by geo location
// by kener at 2015.01.08
self._addMarkWrap = function () { function _addMark(seriesIdx, markData, markType) { var data; if (markType == 'markPoint') { var data = markData.data; if (data && data.length) { for (var k = 0, len = data.length; k < len; k++) {
self._AddPos(data[k]);
}
}
} else {
data = markData.data; if (data && data.length) { for (var k = 0, len = data.length; k < len; k++) {
self._AddPos(data[k][0]);
self._AddPos(data[k][1]);
}
}
}
self._ec._addMarkOri(seriesIdx, markData, markType);
}
self._ec._addMarkOri = self._ec._addMark;
self._ec._addMark = _addMark;
}; /**
* 获取ECharts实例
*
* @return {ECharts}
* @public */ self.getECharts = function () { return self._ec;
}; /**
* 获取地图的偏移量
*
* @return {Array.<number>}
* @public */ self.getMapOffset = function () { return self._mapOffset;
}; /**
* 对echarts的setOption加一次处理
* 用来为markPoint、markLine中添加x、y坐标，需要name与geoCoord对应
*
* @param {Object}
* @public */ self.setOption = function (option, notMerge) { var series = option.series || {}; // 记录所有的geoCoord
for (var i = 0, item; item = series[i++];) { var geoCoord = item.geoCoord; if (geoCoord) { for (var k in geoCoord) {
self._geoCoord[k] = geoCoord[k];
}
}
} // 添加x、y
for (var i = 0, item; item = series[i++];) { var markPoint = item.markPoint || {}; var markLine = item.markLine || {}; var data = markPoint.data; if (data && data.length) { for (var k = 0, len = data.length; k < len; k++) {
self._AddPos(data[k]);
}
}
data = markLine.data; if (data && data.length) { for (var k = 0, len = data.length; k < len; k++) {
self._AddPos(data[k][0]);
self._AddPos(data[k][1]);
}
}
}
self._ec.setOption(option, notMerge);
} /**
* 增加x、y坐标
*
* @param {Object} obj markPoint、markLine data中的项，必须有name
* @param {Object} geoCoord */ self._AddPos = function (obj) { var coord = this._geoCoord[obj.name] var pos = this.geoCoord2Pixel(coord);
obj.x = pos[0] ;//- self._mapOffset[0];
obj.y = pos[1] ;//- self._mapOffset[1];
}; /**
* 绑定地图事件的处理方法
*
* @private */ self._bindEvent = function () { //self._map.getView().on('change:resolution', _zoomChangeHandler('zoom'));
self._viewChangeCenter = self._map.getView().on('change:center', _moveHandler('moving'));
self._mapMoveend = self._map.on('moveend', _moveHandler('moveend'));
self._ec.getZrender().on('dragstart', _dragZrenderHandler(true));
self._ec.getZrender().on('dragend', _dragZrenderHandler(false)); //新增部分
self._ec.getZrender().on('mousewheel', self.refresh);
self._ec.getZrender().on('dblclick', self.refresh);
}
self.clear = function () {
ol.Observable.unByKey(self._viewChangeCenter);
ol.Observable.unByKey(self._mapMoveend);
$("#markline_EchartMap").empty();
$("#markline_EchartMap").remove();
}; /**
* 地图缩放触发事件
*
* @private */
function _zoomChangeHandler(type) {
_fireEvent(type);
} /**
* 地图移动、如拖拽触发事件
*
* @param {string} type moving | moveend 移动中|移动结束
* @return {Function}
* @private */
function _moveHandler(type) { return function (e) { // 记录偏移量
var offsetEle = self._echartsContainer.parentNode.parentNode.parentNode;
self._mapOffset = [ -parseInt(offsetEle.style.left) || 0, -parseInt(offsetEle.style.top) || 0 ];
self._echartsContainer.style.left = self._mapOffset[0] + 'px';
self._echartsContainer.style.top = self._mapOffset[1] + 'px';
_fireEvent(type);
}
} /**
* Zrender拖拽触发事件
*
* @param {boolean} isStart
* @return {Function}
* @private */
function _dragZrenderHandler(isStart) { return function () {
self._map.dragging = isStart;
}
} /**
* 触发事件
*
* @param {stirng} type 事件类型
* @private */
function _fireEvent(type) { var func = self['on' + type]; if (func) {
func();
} else {
self.refresh();
}
} /**
* 刷新页面
*
* @public */ self.refresh = function () { if (self._ec) { var option = self._ec.getOption(); var component = self._ec.component || {}; var legend = component.legend; var dataRange = component.dataRange; if (legend) {
option.legend.selected = legend.getSelectedMap();
} if (dataRange) {
option.dataRange.range = dataRange._range;
}
self._ec.clear();
self.setOption(option);
}
}; return OpenLayer3Ext;
}
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