mapxtreme 2008破解_mapxtreme_mapxtreme编程(5)

第二步，点击放大后可看到主要城市的图层信息，效果如下：

2.jpg

进一步放大后，能看到更多的图层信息，效果如下：

3.jpg

第三步：查询图层信息(根据客户端点击的地图位置，展现不通的图层信息)

CODE:

PrintWriter out = response.getWriter();
        HttpSession session = request.getSession();
        String xmlInfo = "";
        xmlInfo +="<LAYERS><CITY>";
        try {
               int    xpoint=Integer.parseInt(request.getParameter("xpoint"));
              int    ypoint=Integer.parseInt(request.getParameter("ypoint"));         
            MapJ mainMap = (MapJ) session.getAttribute("worldMap");            
            FeatureLayer layer = (FeatureLayer) mainMap.getLayers().get("CHCTY_2K");
//创建一个图原层           
            if (layer.isVisibleAtCurrentZoom()) {       
                ArrayList columns = new ArrayList();
                columns.add("lace_Name");
                columns.add("Latitude");
                columns.add("Longitude");
                DoubleRect rect = mainMap.transformScreenToNumeric(new DoubleRect(new DoublePoint(xpoint-100, ypoint-100), new DoublePoint(xpoint+100, ypoint+100)));
                FeatureSet fs = layer.searchWithinRectangle(columns, rect, QueryParams.EMPTY_PARAMS);//得到图元集
                         Feature f;                    
                         while ((f = fs.getNextFeature()) != null ) {   
                                for (int i = 0; i < f.getAttributeCount(); i++) {                          
                                              switch (i)
                                              {
                                                     case 0:
                                                            xmlInfo +="<LACENAME>"+f.getAttribute(i)+"</PLACENAME>";
                                                            break;
                               case 1:
                                      xmlInfo +="<LATITUDE>"+f.getAttribute(i)+"</LATITUDE>";
                                                            break;     
                               case 2:
                                      xmlInfo +="<LONGITUDE>"+f.getAttribute(i)+"</LONGITUDE>";
                                      break;                                     
                                              }
                                              
                                }                              
                         }         
                fs.dispose();                
            }
        } catch (Exception ex) {
            ex.printStackTrace();
        }
        xmlInfo +="</CITY></LAYERS>";
out.print(xmlInfo);

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