JS实现从照片中裁切自已的肖像

代码如下:

<HTML xmlns:v>
<BODY>
<style>
#tbHole td{background:white;filter:alpha(opacity=50);-moz-opacity:.5}
#tbHole img{width:1;height:1;visibility:hidden}
v\:*{behavior:url(#default#vml)}
</style>
<div id=bxHole onselectstart=return(false) ondragstart=return(false) onmousedown=return(false) oncontextmenu=return(false) style="position:absolute;left:0;top:0;width:800;height:600;border:1px solid #808080;background:url(http://album.sina.com.cn/pic/40db9aaa02000eh1)">
<table id=tbHole cellpadding=0 cellspacing=0 width=100% height=100% style=position:absolute>
<tr height=158><td width=243><img></td><td width=120><img></td><td><img></td></tr>
<tr height=140>
<td><img></td>
<td onmousedown=$('bxHole').dragStart(event,0) style="background:transparent;filter:;-moz-opacity:1;cursor:move;border:1px solid white !important"><img></td>
<td><img></td>
</tr>
<tr><td><img></td><td><img></td><td><img></td></tr>
</table>
<img id=bxHoleMove1 src=http://www.5djs.com/images/upload/41.gif onmousedown=$('bxHole').dragStart(event,1) style="cursor:nw-resize;position:absolute;width:5;height:5;border:1px solid white;background:#BCBCBC">
<img id=bxHoleMove2 src=http://www.5djs.com/images/upload/41.gif onmousedown=$('bxHole').dragStart(event,2) style="cursor:sw-resize;position:absolute;width:5;height:5;border:1px solid white;background:#BCBCBC">
<img id=bxHoleMove3 src=http://www.5djs.com/images/upload/41.gif onmousedown=$('bxHole').dragStart(event,3) style="cursor:nw-resize;position:absolute;width:5;height:5;border:1px solid white;background:#BCBCBC">
<img id=bxHoleMove4 src=http://www.5djs.com/images/upload/41.gif onmousedown=$('bxHole').dragStart(event,4) style="cursor:sw-resize;position:absolute;width:5;height:5;border:1px solid white;background:#BCBCBC">
</div>
<div id=bxImgHoleShow style="position:absolute;left:850;top:50;width:120;height:140;border:1px solid #808080;overflow:hidden"></div>
</BODY>
</html>
<script>
function $(obj){
return typeof(obj)=="object"?"obj":document.getElementById(obj)
}
bxHole_ini()
function bxHole_ini(){
var bx=$("bxHole"),tb=$("tbHole")
$("bxImgHoleShow").innerHTML="<"+(document.all?"v:image":"img")+" id=imgHoleShow src='http://album.sina.com.cn/pic/40db9aaa02000eh1' style='position:absolute;left:0;top:0;width:800;height:600' />"
bx.w0=tb.rows[0].cells[1].offsetWidth
bx.h0=tb.rows[1].offsetHeight
bx.w_img=$("imgHoleShow").offsetWidth
bx.h_img=$("imgHoleShow").offsetHeight
bx.dragStart=function(e,dragType){
bx.dragType=dragType
bx.px=tb.rows[0].cells[0].offsetWidth
bx.py=tb.rows[0].offsetHeight
bx.pw=tb.rows[0].cells[1].offsetWidth
bx.ph=tb.rows[1].offsetHeight
bx.sx=e.screenX
bx.sy=e.screenY
}
bx.onmouseup=function(){
if(bx.dragType==null)
return
var w=tb.rows[0].cells[1].offsetWidth,h=tb.rows[1].offsetHeight
bx.dragType=null
if(w/h>bx.w0/bx.h0)
tb.rows[0].cells[1].style.width=h*bx.w0/bx.h0
else
tb.rows[1].style.height=w*bx.h0/bx.w0
bx.setTip()
}
bx.onmousemove=function(e){
var x,y,w,h
if(bx.dragType==null)
return
if(e==null)
e=event
x=Math.max(bx.px+e.screenX-bx.sx,1)
y=Math.max(bx.py+e.screenY-bx.sy,1)
w=Math.min(bx.pw+e.screenX-bx.sx,tb.offsetWidth-bx.px-1)
h=Math.min(bx.ph+e.screenY-bx.sy,tb.offsetHeight-bx.py-1)
if(bx.dragType==0){
x=Math.min(x,tb.offsetWidth-bx.pw-1)
y=Math.min(y,tb.offsetHeight-bx.ph-1)
w=bx.pw
h=bx.ph
}
if(bx.dragType==1||bx.dragType==4)
w=bx.pw+bx.px-x
if(bx.dragType==1||bx.dragType==2)
h=bx.ph+bx.py-y
if(bx.dragType==2||bx.dragType==3)
x=bx.px
if(bx.dragType==3||bx.dragType==4)
y=bx.py
w=Math.max(w,bx.w0/2)
h=Math.max(h,bx.h0/2)
if(bx.dragType==1||bx.dragType==4)
x=bx.pw+bx.px-w
if(bx.dragType==1||bx.dragType==2)
y=bx.ph+bx.py-h
tb.rows[0].cells[0].style.width=x
tb.rows[0].cells[1].style.width=w
tb.rows[0].style.height=y
tb.rows[1].style.height=h
$("bxHole").setTip()
}
bx.setTip=function(){
var x=tb.rows[0].cells[0].offsetWidth,y=tb.rows[0].offsetHeight,w=tb.rows[0].cells[1].offsetWidth,h=tb.rows[1].offsetHeight
var img=$("imgHoleShow"),per
$("bxHoleMove1").style.left=$("bxHoleMove4").style.left=x-3
$("bxHoleMove1").style.top=$("bxHoleMove2").style.top=y-3
$("bxHoleMove2").style.left=$("bxHoleMove3").style.left=x+w-4
$("bxHoleMove3").style.top=$("bxHoleMove4").style.top=y+h-4
if(w/h>bx.w0/bx.h0)
w=h*bx.w0/bx.h0
else
h=w*bx.h0/bx.w0
per=bx.h0/h
img.style.width=per*bx.w_img
img.style.height=per*bx.h_img
img.style.left=-x*per
img.style.top=-y*per
}
bx.setTip()
}
</script>

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