• 实现地图放大覆盖物出现圆,缩小到一定级别变成其他形状


    <!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) + "" ;
           
           
        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>
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  • 原文地址:https://www.cnblogs.com/iriliguo/p/7047452.html
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