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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>JavaScript 图片切割效果（带拖放、缩放效果） </title>
</head>
<body>
<style type="text/css">
#rRightDown,#rLeftDown,#rLeftUp,#rRightUp,#rRight,#rLeft,#rUp,#rDown{position:absolute;background:#F00;width:5px; height:5px; z-index:500; font-size:0;}
#dragDiv{border:1px solid #000000;}
</style>
<table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr>
<td width="50%"><div id="bgDiv" style="width:400px; height:500px;">
<div id="dragDiv">
<div id="rRightDown" style="right:0; bottom:0;"> </div>
<div id="rLeftDown" style="left:0; bottom:0;"> </div>
<div id="rRightUp" style="right:0; top:0;"> </div>
<div id="rLeftUp" style="left:0; top:0;"> </div>
<div id="rRight" style="right:0; top:50%;"> </div>
<div id="rLeft" style="left:0; top:50%;"> </div>
<div id="rUp" style="top:0; left:50%;"> </div>
<div id="rDown" style="bottom:0;left:50%;"></div>
</div>
</div></td>
<td><div id="viewDiv" style="width:200px; height:200px;"> </div></td>
</tr>
</table>
<script>
var $ = function (id) {
return "string" == typeof id ? document.getElementById(id) : id;
};
var isIE = (document.all) ? true : false;
function addEventHandler(oTarget, sEventType, fnHandler) {
if (oTarget.addEventListener) {
oTarget.addEventListener(sEventType, fnHandler, false);
} else if (oTarget.attachEvent) {
oTarget.attachEvent("on" + sEventType, fnHandler);
} else {
oTarget["on" + sEventType] = fnHandler;
}
};
function removeEventHandler(oTarget, sEventType, fnHandler) {
if (oTarget.removeEventListener) {
oTarget.removeEventListener(sEventType, fnHandler, false);
} else if (oTarget.detachEvent) {
oTarget.detachEvent("on" + sEventType, fnHandler);
} else {
oTarget["on" + sEventType] = null;
}
};
var Class = {
create: function() {
return function() {
this.initialize.apply(this, arguments);
}
}
}
Object.extend = function(destination, source) {
for (var property in source) {
destination[property] = source[property];
}
return destination;
}
//拖放程序
var Drag = Class.create();
Drag.prototype = {
//拖放对象,触发对象
initialize: function(obj, drag, options) {
var oThis = this;
this._obj = $(obj);//拖放对象
this.Drag = $(drag);//触发对象
this._x = this._y = 0;//记录鼠标相对拖放对象的位置
//事件对象(用于移除事件)
this._fM = function(e){ oThis.Move(window.event || e); }
this._fS = function(){ oThis.Stop(); }
this.SetOptions(options);
this.Limit = !!this.options.Limit;
this.mxLeft = parseInt(this.options.mxLeft);
this.mxRight = parseInt(this.options.mxRight);
this.mxTop = parseInt(this.options.mxTop);
this.mxBottom = parseInt(this.options.mxBottom);
this.onMove = this.options.onMove;
this._obj.style.position = "absolute";
addEventHandler(this.Drag, "mousedown", function(e){ oThis.Start(window.event || e); });
},
//设置默认属性
SetOptions: function(options) {
this.options = {//默认值
Limit: false,//是否设置限制(为true时下面参数有用,可以是负数)
mxLeft: 0,//左边限制
mxRight: 0,//右边限制
mxTop: 0,//上边限制
mxBottom: 0,//下边限制
onMove: function(){}//移动时执行
};
Object.extend(this.options, options || {});
},
//准备拖动
Start: function(oEvent) {
//记录鼠标相对拖放对象的位置
this._x = oEvent.clientX - this._obj.offsetLeft;
this._y = oEvent.clientY - this._obj.offsetTop;
//mousemove时移动 mouseup时停止
addEventHandler(document, "mousemove", this._fM);
addEventHandler(document, "mouseup", this._fS);
//使鼠标移到窗口外也能释放
if(isIE){
addEventHandler(this.Drag, "losecapture", this._fS);
this.Drag.setCapture();
}else{
addEventHandler(window, "blur", this._fS);
}
},
//拖动
Move: function(oEvent) {
//清除选择(ie设置捕获后默认带这个)
window.getSelection && window.getSelection().removeAllRanges();
//当前鼠标位置减去相对拖放对象的位置得到offset位置
var iLeft = oEvent.clientX - this._x, iTop = oEvent.clientY - this._y;
//设置范围限制
if(this.Limit){
//获取超出长度
var iRight = iLeft + this._obj.offsetWidth - this.mxRight, iBottom = iTop + this._obj.offsetHeight - this.mxBottom;
//这里是先设置右边下边再设置左边上边,可能会不准确
if(iRight > 0) iLeft -= iRight;
if(iBottom > 0) iTop -= iBottom;
if(this.mxLeft > iLeft) iLeft = this.mxLeft;
if(this.mxTop > iTop) iTop = this.mxTop;
}
//设置位置
this._obj.style.left = iLeft + "px";
this._obj.style.top = iTop + "px";
//附加程序
this.onMove();
},
//停止拖动
Stop: function() {
//移除事件
removeEventHandler(document, "mousemove", this._fM);
removeEventHandler(document, "mouseup", this._fS);
if(isIE){
removeEventHandler(this.Drag, "losecapture", this._fS);
this.Drag.releaseCapture();
}else{
removeEventHandler(window, "blur", this._fS);
}
}
};
//缩放程序
var Resize = Class.create();
Resize.prototype = {
//缩放对象
initialize: function(obj, options) {
var oThis = this;
this._obj = $(obj);//缩放对象
this._right = this._down = this._left = this._up = 0;//坐标参数
this._scale = 1;//比例参数
this._touch = null;//当前触发对象
//用currentStyle（ff用getComputedStyle）取得最终样式
var _style = this._obj.currentStyle || document.defaultView.getComputedStyle(this._obj, null);
this._xBorder = parseInt(_style.borderLeftWidth) + parseInt(_style.borderRightWidth);
this._yBorder = parseInt(_style.borderTopWidth) + parseInt(_style.borderBottomWidth);
//事件对象(用于移除事件)
this._fR = function(e){ oThis.Resize(e); }
this._fS = function(){ oThis.Stop(); }
this.SetOptions(options);
this.Limit = !!this.options.Limit;
this.mxLeft = parseInt(this.options.mxLeft);
this.mxRight = parseInt(this.options.mxRight);
this.mxTop = parseInt(this.options.mxTop);
this.mxBottom = parseInt(this.options.mxBottom);
this.MinWidth = parseInt(this.options.MinWidth);
this.MinHeight = parseInt(this.options.MinHeight);
this.Scale = !!this.options.Scale;
this.onResize = this.options.onResize;
this._obj.style.position = "absolute";
},
//设置默认属性
SetOptions: function(options) {
this.options = {//默认值
Limit: false,//是否设置限制(为true时下面mx参数有用)
mxLeft: 0,//左边限制
mxRight: 0,//右边限制
mxTop: 0,//上边限制
mxBottom: 0,//下边限制
MinWidth: 50,//最小宽度
MinHeight: 50,//最小高度
Scale: false,//是否按比例缩放
onResize: function(){}//缩放时执行
};
Object.extend(this.options, options || {});
},
//设置触发对象
Set: function(resize, side) {
var oThis = this, resize = $(resize), _fun, _cursor;
if(!resize) return;
//根据方向设置 _fun是缩放时执行的程序 _cursor是鼠标样式
switch (side.toLowerCase()) {
case "up" :
_fun = function(e){ if(oThis.Scale){ oThis.scaleUpRight(e); }else{ oThis.SetUp(e); } };
_cursor = "n-resize";
break;
case "down" :
_fun = function(e){ if(oThis.Scale){ oThis.scaleDownRight(e); }else{ oThis.SetDown(e); } };
_cursor = "n-resize";
break;
case "left" :
_fun = function(e){ if(oThis.Scale){ oThis.scaleLeftUp(e); }else{ oThis.SetLeft(e); } };
_cursor = "e-resize";
break;
case "right" :
_fun = function(e){ if(oThis.Scale){ oThis.scaleRightDown(e); }else{ oThis.SetRight(e); } };
_cursor = "e-resize";
break;
case "left-up" :
_fun = function(e){ if(oThis.Scale){ oThis.scaleLeftUp(e); }else{ oThis.SetLeft(e); oThis.SetUp(e); } };
_cursor = "nw-resize";
break;
case "right-up" :
_fun = function(e){ if(oThis.Scale){ oThis.scaleRightUp(e); }else{ oThis.SetRight(e); oThis.SetUp(e); } };
_cursor = "ne-resize";
break;
case "left-down" :
_fun = function(e){ if(oThis.Scale){ oThis.scaleLeftDown(e); }else{ oThis.SetLeft(e); oThis.SetDown(e); } };
_cursor = "ne-resize";
break;
case "right-down" :
default :
_fun = function(e){ if(oThis.Scale){ oThis.scaleRightDown(e); }else{ oThis.SetRight(e); oThis.SetDown(e); } };
_cursor = "nw-resize";
}
//设置触发对象
resize.style.cursor = _cursor;
addEventHandler(resize, "mousedown", function(e){ oThis._fun = _fun; oThis._touch = resize; oThis.Start(window.event || e); });
},
//准备缩放
Start: function(oEvent, o) {
//防止冒泡
if(isIE){ oEvent.cancelBubble = true; } else { oEvent.stopPropagation(); }
//计算样式初始值
this.style_width = this._obj.offsetWidth;
this.style_height = this._obj.offsetHeight;
this.style_left = this._obj.offsetLeft;
this.style_top = this._obj.offsetTop;
//设置缩放比例
if(this.Scale){ this._scale = this.style_width / this.style_height; }
//计算当前边的对应另一条边的坐标 例如右边缩放时需要左边界坐标
this._left = oEvent.clientX - this.style_width;
this._right = oEvent.clientX + this.style_width;
this._up = oEvent.clientY - this.style_height;
this._down = oEvent.clientY + this.style_height;
//如果有范围 先计算好范围内最大宽度和高度
if(this.Limit){
this._mxRight = this.mxRight - this._obj.offsetLeft;
this._mxDown = this.mxBottom - this._obj.offsetTop;
this._mxLeft = this.mxLeft + this.style_width + this._obj.offsetLeft;
this._mxUp = this.mxTop + this.style_height + this._obj.offsetTop;
}
//mousemove时缩放 mouseup时停止
addEventHandler(document, "mousemove", this._fR);
addEventHandler(document, "mouseup", this._fS);
//使鼠标移到窗口外也能释放
if(isIE){
addEventHandler(this._touch, "losecapture", this._fS);
this._touch.setCapture();
}else{
addEventHandler(window, "blur", this._fS);
}
},
//缩放
Resize: function(e) {
//没有触发对象的话返回
if(!this._touch) return;
//清除选择(ie设置捕获后默认带这个)
window.getSelection && window.getSelection().removeAllRanges();
//执行缩放程序
this._fun(window.event || e);
//设置样式
//因为计算用的offset是把边框算进去的所以要减去
this._obj.style.width = this.style_width - this._xBorder + "px";
this._obj.style.height = this.style_height - this._yBorder + "px";
this._obj.style.top = this.style_top + "px";
this._obj.style.left = this.style_left + "px";
//附加程序
this.onResize();
},
//普通缩放
//右边
SetRight: function(oEvent) {
//当前坐标位置减去左边的坐标等于当前宽度
this.repairRight(oEvent.clientX - this._left);
},
//下边
SetDown: function(oEvent) {
this.repairDown(oEvent.clientY - this._up);
},
//左边
SetLeft: function(oEvent) {
//右边的坐标减去当前坐标位置等于当前宽度
this.repairLeft(this._right - oEvent.clientX);
},
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