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给地图加个放大镜

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增大字体作者：KaSim 来源：星空资源网发布时间：2008-1-10 13:29:22 收藏到QQ书签

以下是程序代码

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>给地图加个放大镜</title>
<SCRIPT>

var shrinkfactor=5

// left and top position of the thumbnailimage 
// (distance to the left and top browser-margin, pixels)
var thumbleft = 30
var thumbtop = 30

// left and top position of the zoomed image 
// (distance to the left and top browser-margin, pixels)
var largeleft = 300
var largetop = 30

// width and height of the enlarged image's sector (visible part, pixels)
var clipwidth = 240
var clipheight = 160
</SCRIPT>
<SCRIPT>

var isNav, isIE
var offsetX, offsetY
var selectedObj

var largewidth = 0
var largeheight = 0

var thumbwidth = Math.floor(largewidth/shrinkfactor)
var thumbheight = Math.floor(largeheight/shrinkfactor)

var dragimgwidth = Math.floor(clipwidth/shrinkfactor)
var dragimgheight = Math.floor(clipheight/shrinkfactor)
var dragimgleft = thumbleft+3
var dragimgtop = thumbtop+3

var difleft= largeleft-thumbleft
var diftop= largetop-thumbtop

var clippoints

var cliptop=0
var clipbottom=cliptop+clipheight
var clipleft=0
var clipright=clipleft+clipwidth

if (parseInt(navigator.appVersion) >= 4) {
 if (navigator.appName == "Netscape") {
  isNav = true
 } else {
  isIE = true
 }
}

function setZIndex(obj, zOrder) {
 obj.zIndex = zOrder
}

function shiftTo(obj, x, y) {
 if (isNav) {
        if(x<=document.thumb.left) {x=document.thumb.left}
  if(x>=(document.thumb.left+thumbwidth-dragimgwidth-2)) {x=document.thumb.left+thumbwidth-dragimgwidth-2}
  if(y<=document.thumb.top) {y=document.thumb.top}
  if(y>=(document.thumb.top+thumbheight-dragimgheight-2)) {y=document.thumb.top+thumbheight-dragimgheight-2}
  obj.moveTo(x,y)
 } else {
  if(x<=document.all.thumb.style.posLeft) {x=document.all.thumb.style.posLeft}
  if(x>=(document.all.thumb.style.posLeft+thumbwidth-dragimgwidth-2)) {x=document.all.thumb.style.posLeft+thumbwidth-dragimgwidth-2}
  if(y<=document.all.thumb.style.posTop) {y=document.all.thumb.style.posTop}
  if(y>=(document.all.thumb.style.posTop+thumbheight-dragimgheight-2)) {y=document.all.thumb.style.posTop+thumbheight-dragimgheight-2}
  obj.pixelLeft = x
  obj.pixelTop = y
 } 
 cliptop = (y-thumbtop)*shrinkfactor
 clipbottom = cliptop+clipheight
 clipleft = (x-thumbleft)*shrinkfactor
 clipright = clipleft+clipwidth

if (document.all) {
  clippoints ="rect("+cliptop+" "+clipright+" "+clipbottom+" "+clipleft+")"
  document.all.large.style.posTop=largetop-cliptop
  document.all.large.style.posLeft=largeleft-clipleft
  document.all.large.style.clip=clippoints
 }
 if (document.layers) {
  document.large.top=largetop-cliptop
  document.large.left=largeleft-clipleft
  document.large.clip.left = clipleft
  document.large.clip.right = clipright
  document.large.clip.top = cliptop
  document.large.clip.bottom = clipbottom
 }
}

function setSelectedElem(evt) {
 if (isNav) {
  var testObj
  var clickX = evt.pageX
  var clickY = evt.pageY
  for (var i = document.layers.length - 1; i >= 0; i--) {
   testObj = document.layers[i]
   if ((clickX > testObj.left) && 
    (clickX < testObj.left + testObj.clip.width) && 
    (clickY > testObj.top) && 
    (clickY < testObj.top + testObj.clip.height && document.layers[i].id=="dragimg")) {
     selectedObj = testObj
     setZIndex(selectedObj, 100)
     return
   }
  }
 } else {
  var imgObj = window.event.srcElement
  if (imgObj.parentElement.id.indexOf("dragimg") != -1) {
   selectedObj = imgObj.parentElement.style
   setZIndex(selectedObj,100)
   return
  }
 }
 selectedObj = null
 return
}

function dragIt(evt) {
 if (selectedObj) {
  if (isNav) {
   shiftTo(selectedObj, (evt.pageX - offsetX), (evt.pageY - offsetY))
  } else {
   shiftTo(selectedObj, (window.event.clientX - offsetX), (window.event.clientY - offsetY))
   return false
  }
 }
}

function engage(evt) {
 setSelectedElem(evt)
 if (selectedObj) {
  if (isNav) {
   offsetX = evt.pageX - selectedObj.left
   offsetY = evt.pageY - selectedObj.top
  } else {
   offsetX = window.event.offsetX
   offsetY = window.event.offsetY
  }
 }
 return false
}

function release(evt) {
 if (selectedObj) {
  setZIndex(selectedObj, 0)
  selectedObj = null
 }
}

function setNavEventCapture() {
 if (isNav) {
  document.captureEvents(Event.MOUSEDOWN | Event.MOUSEMOVE | Event.MOUSEUP)
 }
}

function init() {
 if (document.layers) {
        var imageurl=document.large.document.largepic.src
        largewidth=document.large.document.width
  largeheight=document.large.document.height
  thumbwidth = Math.floor(largewidth/shrinkfactor)
  thumbheight = Math.floor(largeheight/shrinkfactor)
        document.thumb.document.write("<IMG NAME='thumbpic' SRC='"+imageurl+"' width="+thumbwidth+"  height="+thumbheight+">")
        document.thumb.document.close()
  document.dragimg.document.write("<IMG NAME='dragimgpic' border=2 SRC='../../dragimg.gif' width="+dragimgwidth+" height="+dragimgheight+">")
        document.dragimg.document.close()
  document.large.left=largeleft
  document.large.top=largetop
 
  document.thumb.left=thumbleft
  document.thumb.top=thumbtop
 
  document.dragimg.left=dragimgleft
  document.dragimg.top=dragimgtop
  
  document.large.clip.left=clipleft
  document.large.clip.right=clipright
  document.large.clip.top=cliptop
  document.large.clip.bottom=clipbottom
  document.large.visibility="visible"
  
  setNavEventCapture()
 }
 if (document.all) {
        var imageurl=document.largepic.src
  largewidth=document.all.large.offsetWidth
  largeheight=document.all.large.offsetHeight
  thumbwidth = Math.floor(largewidth/shrinkfactor)
  thumbheight = Math.floor(largeheight/shrinkfactor)
  thumb.innerHTML="<IMG NAME='thumbpic' SRC='"+imageurl+"' width="+thumbwidth+"  height="+thumbheight+">"
  dragimg.innerHTML="<IMG NAME='dragimgpic' border=2 SRC='<a target="_blank" href="http://www.jscode.cn/Uploadfile/200651515151450.GIF'">http://www.jscode.cn/Uploadfile/200651515151450.GIF'</a>; width="+dragimgwidth+"  height="+dragimgheight+">"
 
  document.all.large.style.posLeft=largeleft
  document.all.large.style.posTop=largetop
 
  document.all.thumb.style.posLeft=thumbleft
  document.all.thumb.style.posTop=thumbtop
 
  document.all.dragimg.style.posLeft=dragimgleft
  document.all.dragimg.style.posTop=dragimgtop
  clippoints ="rect("+cliptop+" "+clipright+" "+clipbottom+" "+clipleft+")"
  document.all.large.style.clip=clippoints
  document.all.large.style.visibility="visible"
 }
 
 document.onmousedown = engage
 document.onmousemove = dragIt
 document.onmouseup = release
}

window.onload=init
</SCRIPT></head>

<body>
<p>用鼠标移动下面的方框，效果不错吧</p>
<center>
<DIV style="position:absolute;visibility:hidden;" ID="large"><IMG NAME="largepic" SRC="<a target="_blank" href="http://www.jscode.cn/Uploadfile/2006515151036789.JPG"">http://www.jscode.cn/Uploadfile/2006515151036789.JPG"</a>;></DIV>
<DIV style="position:absolute;" ID="thumb"></DIV>
<DIV style="position:absolute;" ID="dragimg"></DIV></center>
</body>
</html>

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[Ctrl+A 全部选择提示：你可先修改部分代码，再按运行]

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