<!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" /> <style type="text/css"> body, html { 100%;height: 100%;margin:0;font-family:"微软雅黑";} #allmap{100%;height:500px;} p{margin-left:5px; font-size:14px;} </style> <script type="text/javascript" src="http://api.map.baidu.com/api?v=2.0&ak=351KhDAvqI7L3ADGgXphAg973htwu7WZ"></script> <title>实现地图放大出现圆,缩小到一定级别变成其他形状</title> </head> <body> <div id="allmap"></div> </body> </html> <script type="text/javascript"> // 百度地图API功能 var mp = new BMap.Map("allmap"); mp.centerAndZoom(new BMap.Point(106.33,29.35), 8); mp.enableScrollWheelZoom(); // 复杂的自定义覆盖物 function ComplexCustomOverlay(point, text, mouseoverText){ this._point = point; this._text = text; this._overText = mouseoverText; } ComplexCustomOverlay.prototype = new BMap.Overlay(); ComplexCustomOverlay.prototype.initialize = function(map){ this._map = map; var div = this._div = document.createElement("div"); div.style.position = "absolute"; div.style.zIndex = BMap.Overlay.getZIndex(this._point.lat); div.style.backgroundColor = "#EE5D5B"; div.style.border = "1px solid #BC3B3A"; div.style.color = "white"; var s=map.getZoom(); if(s>=8){ div.style.borderRadius="100%"; div.style.height = "100px"; div.style.width = "100px"; div.style.padding = "2px"; div.style.lineHeight = "18px"; div.style.whiteSpace = "nowrap"; div.style.MozUserSelect = "none"; div.style.fontSize = "12px" var span = this._span = document.createElement("span"); div.appendChild(span); span.appendChild(document.createTextNode(this._text)); span.style.textAligh = "center"; span.style.position="absolute"; span.style.top="40px" span.style.left="20px" }else{ div.style.borderRadius="0"; div.style.height = "18px"; div.style.padding = "2px"; div.style.lineHeight = "18px"; div.style.whiteSpace = "nowrap"; div.style.MozUserSelect = "none"; div.style.fontSize = "12px" var span = this._span = document.createElement("span"); div.appendChild(span); span.appendChild(document.createTextNode(this._text)); span.style.textAligh = "center"; } var that = this; var arrow = this._arrow = document.createElement("div"); arrow.style.background = "url(http://map.baidu.com/fwmap/upload/r/map/fwmap/static/house/images/label.png) no-repeat"; arrow.style.position = "absolute"; arrow.style.width = "11px"; arrow.style.height = "10px"; arrow.style.top = "22px"; arrow.style.left = "10px"; arrow.style.overflow = "hidden"; div.appendChild(arrow); mp.getPanes().labelPane.appendChild(div); return div; } ComplexCustomOverlay.prototype.draw = function(){ var map = this._map; var pixel = map.pointToOverlayPixel(this._point); this._div.style.left = pixel.x - parseInt(this._arrow.style.left) + "px"; this._div.style.top = pixel.y - 30 + "px"; } var txt = "银湖海岸城", mouseoverTxt = txt + " " + parseInt(Math.random() * 1000,10) + "套" ; var myCompOverlay1 = new ComplexCustomOverlay(new BMap.Point(106.6304300000, 29.7179800000), "渝北区"); var myCompOverlay2 = new ComplexCustomOverlay(new BMap.Point(106.6304300000, 29.7179800000), "渝北"); mp.addOverlay(myCompOverlay1); mp.addEventListener("zoomend", function() { var temp = mp.getZoom(); if(temp<=12){ mp.clearOverlays(); mp.addOverlay(myCompOverlay2); }else{ mp.clearOverlays(); mp.addOverlay(myCompOverlay1); } }); </script>