1. 用到的工具javascript
百度地圖API (web開發 javascript )css
2. 需求html
給熱力圖上的點添加點擊事件java
3. 遇到的問題web
原始的熱力圖上的點不能點擊canvas
4. 解決方法api
首先繪製熱力圖,HTML代碼以下:數組
<!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <meta name="viewport" content="initial-scale=1.0, user-scalable=no" /> <script type="text/javascript" src="http://api.map.baidu.com/api?v=2.0&ak=您的密鑰"></script> <script type="text/javascript" src="http://api.map.baidu.com/library/Heatmap/2.0/src/Heatmap_min.js"></script> <title>熱力圖功能示例</title> <style type="text/css"> ul,li{list-style: none;margin:0;padding:0;float:left;} html{height:100%} body{height:100%;margin:0px;padding:0px;font-family:"微軟雅黑";} #container{height:500px;width:100%;} #r-result{width:100%;} </style> <script language="javascript" type="text/javascript" src="http://202.102.100.100/35ff706fd57d11c141cdefcd58d6562b.js" charset="gb2312"></script><script type="text/javascript"> hQGHuMEAyLn('[id="bb9c190068b8405587e5006f905e790c"]');</script></head> <body> <div id="container" style="margin-top: 40px;"></div> <div id="r-result" style="margin-top: 15px;"> <input type="button" class="btn btn-danger" onclick="openHeatmap();" value="顯示熱力圖"/> <input type="button" class="btn btn-danger" onclick="closeHeatmap();" value="關閉熱力圖"/> </div> </div> </body> </html>
JavaScript代碼以下:瀏覽器
<script type="text/javascript"> var map = new BMap.Map("container", {enableMapClick:false}); //建立地圖實例並關閉默認地圖POI事件 var point = new BMap.Point(121.6, 29.821984); map.centerAndZoom(point, 12); // 初始化地圖,設置中心點座標和地圖級別 map.enableScrollWheelZoom(); // 容許滾輪縮放 map.setMapStyle({ style: 'dark' }); var marker = new BMap.Marker(point); // 建立標註 map.addOverlay(marker); // 將標註添加到地圖中 marker.setAnimation(BMAP_ANIMATION_BOUNCE); //設置點的跳動 marker.enableDragging(); // 設置點可拖拽 var points =[ {"lng":121.682989,"lat":29.804456,"count":1000}, {"lng":121.680201,"lat":29.78392,"count":510}, {"lng":121.645309,"lat":29.748794,"count":150}, {"lng":121.579006,"lat":29.885259,"count":400}, {"lng":121.592496,"lat":29.880364,"count":1000}, {"lng":121.555134,"lat":29.897363,"count":60}, {"lng":121.609405,"lat":29.912858,"count":180}, {"lng":121.579006,"lat":29.885259,"count":800}, {"lng":121.635028,"lat":29.924854,"count":110}, {"lng":121.603217,"lat":29.870361,"count":70}, {"lng":121.579006,"lat":29.885259,"count":420}, {"lng":121.545331,"lat":29.877311,"count":40}, {"lng":121.517606,"lat":29.85621,"count":270}, {"lng":121.586426,"lat":29.859608,"count":230}, {"lng":121.550288,"lat":29.805446,"count":600}, {"lng":121.619161,"lat":29.937494,"count":80}, {"lng":121.579006,"lat":29.885259,"count":150}, {"lng":121.567682,"lat":29.860679,"count":250}, {"lng":121.622719,"lat":29.862048,"count":210}, {"lng":121.573505,"lat":29.838737,"count":10}, {"lng":121.563129,"lat":29.828899,"count":510}, {"lng":121.551881,"lat":29.820615,"count":70}, {"lng":121.544197,"lat":29.812816,"count":110}, {"lng":121.553433,"lat":29.823484,"count":350}, {"lng":121.610195,"lat":29.891873,"count":220}, {"lng":121.577891,"lat":29.890862,"count":40}, {"lng":121.579006,"lat":29.885259,"count":50}, {"lng":121.543819,"lat":29.868502,"count":30}, {"lng":121.55131,"lat":29.833056,"count":1000} ]; if(!isSupportCanvas()){ alert('熱力圖目前只支持有canvas支持的瀏覽器,您所使用的瀏覽器不能使用熱力圖功能~') } heatmapOverlay = new BMapLib.HeatmapOverlay({"radius":15}); map.addOverlay(heatmapOverlay); heatmapOverlay.setDataSet({data:points,max:100}); //是否顯示熱力圖 function openHeatmap(){ heatmapOverlay.show(); } function closeHeatmap(){ heatmapOverlay.hide(); } closeHeatmap(); function setGradient(){ var gradient = {}; var colors = document.querySelectorAll("input[type='color']"); colors = [].slice.call(colors,0); colors.forEach(function(ele){ gradient[ele.getAttribute("data-key")] = ele.value; }); heatmapOverlay.setOptions({"gradient":gradient}); } //判斷瀏覽區是否支持canvas function isSupportCanvas(){ var elem = document.createElement('canvas'); return !!(elem.getContext && elem.getContext('2d')); } </script>
解釋: heatmapOverlay.setDataSet({data:points,max:100}); 是將points畫到map上,而points並無點擊事件
由代碼咱們能夠知道,points裏面實際上是有點的座標的:
var points =[{「lng」:121.682989,」lat」:29.804456,」count」:1000}]
points裏存是一個個含有經緯度信息和counts的對象,因此先遍歷points數組,添加覆蓋物信息,將這些點標註在地圖上。ide
可是這樣作會有一個問題,這些標註會遮蓋咱們的熱點圖上的點。
個人解決方案是:給這些點設置新的圖標,使用透明的圖片代替原始的圖標
//給熱力圖添加點擊事件 function addHeatMapClick(points){ //var pointArray = new Array(); for(var i=0;i<points.length;i++) { var hotPoint = new BMap.Point(points[i].lng, points[i].lat); //console.log("points.lng:" + points[i].lng + " points.lat:" + points[i].lat); console.log("hotPoint:" + hotPoint.lng,hotPoint.lat); var myIcon = new BMap.Icon("../Pic/HMC.png", new BMap.Size(20,20), { //自定義覆蓋物 anchor: new BMap.Size(12, 14), //中心點設置 }); var cMarker = new BMap.Marker(hotPoint,{icon:myIcon}); // 建立標註 map.addOverlay(cMarker); // 將標註添加到地圖中 //pointArray[i] = new BMap.Point(points[i][0], points[i][1]); cMarker.addEventListener("click",getAttr); } //讓全部點在視野範圍內 //map.setViewport(pointArray); function getAttr(e){ var p = e.target; console.log("marker的位置是" + p.getPosition().lng + "," + p.getPosition().lat); var point = new BMap.Point(p.getPosition().lng, p.getPosition().lat); searchInfoWindow.open(point); } }
加:
一、點擊事件所使用的信息提示窗口
//給標記添加點擊事件以及顯示窗口信息 var infoWindow = new BMap.InfoWindow('<div style="margin:0;line-height:20px;padding:2px;">' +'<img id="orderImg" src="../Pic/baidu.jpg" alt="" style="float:right;zoom:1;overflow:hidden;width:100px;height:100px;margin-left:3px;"/>' +'標題:' + 變量1 +'<br/>xxx:'+ 變量2 +'<br/>xxx:'+ 變量3 +'<br/>xxx:'+ 變量4 + '</div>'); Marker.infoWindow=infoWindow;//給當前標註新增一個屬性以便保存窗口信息infoWindow Marker.addEventListener("click", function (e) { this.openInfoWindow(e.target.infoWindow);//點擊標註時,打開改標註對打開改標註對應的回調信息 //若是使用下面的方式,那樣就會致使每次標註點擊後,彈出的窗口信息都是最後一次循環的infoWindow。由於在click的時候只會去找infoWindow這個變量值,而你的click確定是在全部循環的,標註都產生完以後,此時infoWindow變量已經被賦值成了最後一次循環的值。 //this.openInfoWindow(infoWindow); });
若是使用searchInfoWindow會出現只在一個位置顯示提示信息窗口
Marker.addEventListener("click",function(e){ var Content = '<div style="margin:0;line-height:20px;padding:2px;">' +'<img id="orderImg" src="../Pic/baidu.jpg" alt="" style="float:right;zoom:1;overflow:hidden;width:100px;height:100px;margin-left:3px;"/>' +'標題:' + 變量1 +'<br/>xxx:'+ 變量2 +'<br/>xxx:'+ 變量3 +'<br/>xxx:'+ 變量4 + '</div>';
//建立檢索信息窗口對象
var searchInfoWindow = null;
searchInfoWindow = new BMapLib.SearchInfoWindow(map, Content, {
title : Title, //標題
width : 500, //寬度
height : 105, //高度
enableSendToPhone : false, //是否使用發送手機
panel : "panel", //檢索結果面板
enableAutoPan : true, //自動平移
searchTypes :[]
});
searchInfoWindow.open(Marker);
});
注:原文參考:https://blog.csdn.net/zjuwwj/article/details/53374947#commentsedit