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Maps Javascript

 更新時間：2007年01月22日 00:00:00   作者：  
<html>
  <head>
     <title>Ajaxian Maps</title>
  <style type="text/css">
     h1{
     font:20pt sans-serif;
  }
  #outerDiv{
     height:600px;
     width:800px;
     border:1px solid black;
     position:relative;
     overflow:hidden;
  }
  #innerDiv{
     position:relative;
     left:0px;
     top:0px;
  }
  #toggleZoomDiv{
     position:absolute;
     top:10px;
     left:10px;
     z-index:1
     width:72px;
     height:30px;
  }
  #togglePushPinDiv{
     position:absolute;
     top:10px;
     left:87px;
     z-index:1;
     width:72px;
     height:30px
  }
  </style>
  <script language="javascript" src="resource/js/browserdetect_lite.js" type="text/javascript"></script>
  <script language="javascript" src="resource/js/opacity.js" type="text/javascript"></script>
  <script type="text/javascript" language="javascript">
     //常數(shù)
  var viewportWidth=800;
  var viewportHeight=600;
  var tileSize=100;
  var zoom=0;
  var zoomSizes=[["2000px","1400px"],["1500px","1050px"]];
  //用來控制地圖div的移動
  var dragging=false;
  var top;
  var left;
  var dragStartTop;
  var dragStartLeft;

     function init(){
     //讓inner div足夠大，以正確顯示出地圖
     setInnerDivSize(zoomSizes[zoom][0],zoomSizes[zoom][1]);
     //為拖曳操作綁定鼠標(biāo)監(jiān)聽器
     var outerDiv=document.getElementById("outerDiv");
     outerDiv.onmousedown=startMove;
     outerDiv.onmousemove=processMove;
     outerDiv.onmouseup=stopMove;
     //在IE中支持拖曳所必須
     outerDiv.ondragstart=function()
     { return false;}
     //解決在IE中觸發(fā)器div的透明度問題
     new OpacityObject('toggleZoomDiv','resource/images/zoom').setBackground();
     new OpacityObject('togglePushPinDiv','resource/images/pushpin').setBackground();
     checkTiles();
  }

  function startMove(event){
  //針對IE必需
     if(!event)event=window.event;
     dragStartLeft=event.clientX;
     dragStartTop=event.clientY;
     var innerDiv=document.getElementById("innerDiv");
     innerDiv.style.cursor="-moz-grab";

     top=stripPx(innerDiv.style.top);
     left=stripPx(innerDiv.style.left);

     dragging=true;
     return false;
  }

  function processMove(event){
     if(!event)event=window.event; //for IE
     var innerDiv=document.getElementById("innerDiv");
     if(dragging){
       innerDiv.style.top=parseFloat(top)+(event.clientY-dragStartTop);
    innerDiv.style.left=parseFloat(left)+(event.clientX-dragStartLeft);
     }
     checkTiles();
  }

  function checkTiles(){
     //檢查在inner div中將顯示哪個標(biāo)題
     var visibleTiles=getVisibleTiles();
     //當(dāng)把每個小地圖快添加到inner div中時，要先檢查其是否已經(jīng)添加
     var innerDiv=document.getElementById("innerDiv");
     var visibleTilesMap={};
     for (i=0;i<visibleTiles.length ;i++)
     {
        var tileArray=visibleTiles[i];
     var tileName="x"+tileArray[0]+"y"+tileArray[1]+"z"+zoom;
     visibleTilesMap[tileName]=true;
     var img=document.getElementById(tileName);
     if(!img){
        img=document.createElement("img");
     img.src="resource/tiles/"+tileName+".jpg";
     img.style.position="absolute";
     img.style.left=(tileArray[0]*tileSize)+"px";
     img.style.top=(tileArray[1]*tileSize)+"px";
     img.style.zIndex=0;
     img.setAttribute("id",tileName);
     innerDiv.appendChild(img);
     }
     }
     var imgs=innerDiv.getElementByTagName("img");
     for(i=0;i<imgs.length;i++){
        var id=imgs[i].getAttribute("id");
     if(!visibleTilesMap[id]){
        innerDiv.removeChild(imgs[i]);
     i--;//compensate for live nodeslist
     }
     }
     }

  function getVisibleTiles(){
     var innerDiv=document.getElementById("innerDiv");
     var mapX=stripPx(innerDiv.style.left);
     var mapY=stripPx(innerDiv.style.top);
     var startX=Math.abs(Math.floor(mapX/tileSize))-1;
     var startY=Math.abs(Math.floor(mapY/tileSize))-1;
     var tilesX=Math.ceil(viewportWidth/tileSize)+1;
     var tilesY=Math.ceil(viewportHeight/tileSize)+1;
     var visibleTileArray=[];
     var counter=0;
     for(x=startX;x<(tilesX+startX);x++){
        for(y=startY;y<(tilesY+startY);y++){
        visibleTileArray[counter++]=[x,y];
     }
     }
           return visibleTileArray;
  }

  function stopMove(){
     var innerDiv=document.getElementById("innerDiv");
     innerDiv.style.cursor="";
     dragging=false;
  }

  function stripPx(value){
     if(value=="")return 0;
     return parseFloat(value.substring(0,value.length-2));
  }

  function setInnerDivSize(width,height){
     var innerDiv=document.getElementById("innerDiv");
     innerDiv.style.width=width;
     innerDiv.style.height=height;
  }

  function toggleZoom(){
     zoom=(zoom==0)?1:0;
     var innerDiv=document.getElementById("innerDiv");
     var imgs=innerDiv.getElementsByTagName("img");
     while(imgs.length>0)innerDiv.removeChild(imgs[0]);
     setInnerDivSize(zoomSizes[zoom][0],zoomSizes[zoom][1]);
     if(document.getElementById("pushPin"))togglePushPin();
     checkTiles();
  }

  function togglePushPin(){
     var pinImage=document.getElementById("pushPin");
     if(pinImage){
        pinImage.parentNode.removeChild(pinImage);
     var dialog=document.getElementById("pinDialog");
     dialog.parentNode.removeChild(dialog);
     return;
     }

     var innerDiv=document.getElementById("innerDiv");
     pinImage=document.createElement("div");
     pinImage.style.position="absolute";
     pinImage.style.left=(zoom==0)?"850px":"630px";
     pinImage.style.top=(zoom==0)?"570px":"420px";
     pinImage.style.width="37px";
     pinImage.style.height="34px";
     pinImage.zIndex=1;
     pinImage.setAttribute("id","pushPin");
     innerDiv.appendChild(pinImage);

     new OpacityObject("pubshPin","resource/images/pin").setBackground();
     var dialog=document.createElement("div");
     dialog.style.position="absolute";
     dialog.style.left=(stripPx(pinImage.style.left)-90)+"px";
     dialog.style.top=(stripPx(pinImage.style.top)-210)+"px";
     dialog.style.width="309px";
     dialog.style.height="229px";
     dialog.style.zIndex=2;
     dialog.setAttribute("id","pinDialog");
     dialog.innerHTML="<table height='80%' width='100%'>"+"<tr><td align='center'>The capital of Spain</td></tr></table>";
     innerDiv.appendChild(dialog);
     new OpacityObject('pinDialog','resource/images/dialog').setBackground();
       }  
  </script>
   </head>
   <body onload="init()">
       <p>
       <h1>Ajaxian Maps</h1>
    </p>
    <div id="outerDiv">
       <div id="toggleZoomDiv" onclick="toggleZoom()">
    </div>
    <div id="togglePushPinDiv" onclick="togglePushPin()">
    </div>
    <div id="innerDiv" style="z-index:0">
            The rain in Spain falls mainly in the plains.
    </div>
    </div>
   </body>
</html>

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