图片切割效果

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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>

var $ = function (id) {
return "string" == typeof id ? document.getElementById(id) : id;
};

var isIE = (document.all) ? true : false;

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";
}
//插入字符解决ff下捕获效的问题
if(!isIE){ resize.innerHTML = "<font size='1px'> </font>"; }
//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);
},
//上边
SetUp: function(oEvent) {
this.repairUp(this._down - oEvent.clientY);
},
//比例缩放
//比例缩放右下
scaleRightDown: function(oEvent) {
//先计算宽度然后按比例计算高度最后根据确定的高度计算宽度（宽度优先）
this.SetRight(oEvent);
this.repairDown(parseInt(this.style_width / this._scale));
this.repairRight(parseInt(this.style_height * this._scale));
},
//比例缩放左下
scaleLeftDown: function(oEvent) {
this.SetLeft(oEvent);
this.repairDown(parseInt(this.style_width / this._scale));
this.repairLeft(parseInt(this.style_height * this._scale));
},
//比例缩放右上
scaleRightUp: function(oEvent) {
this.SetRight(oEvent);
this.repairUp(parseInt(this.style_width / this._scale));
this.repairRight(parseInt(this.style_height * this._scale));
},
//比例缩放左上
scaleLeftUp: function(oEvent) {
this.SetLeft(oEvent);
this.repairUp(parseInt(this.style_width / this._scale));
this.repairLeft(parseInt(this.style_height * this._scale));
},
//这里是高度优先用于上下两边(体验更好)
//比例缩放下右
scaleDownRight: function(oEvent) {
this.SetDown(oEvent);
this.repairRight(parseInt(this.style_height * this._scale));
this.repairDown(parseInt(this.style_width / this._scale));
},
//比例缩放上右
scaleUpRight: function(oEvent) {
this.SetUp(oEvent);
this.repairRight(parseInt(this.style_height * this._scale));
this.repairUp(parseInt(this.style_width / this._scale));
},
//修正程序
//修正右边
repairRight: function(iWidth) {
//右边和下边只要设置宽度和高度就行
//当少于最少宽度
if (iWidth < this.MinWidth){ iWidth = this.MinWidth; }
//当超过当前设定的最大宽度
if(this.Limit && iWidth > this._mxRight){ iWidth = this._mxRight; }
//修改样式
this.style_width = iWidth;
},
//修正下边
repairDown: function(iHeight) {
if (iHeight < this.MinHeight){ iHeight = this.MinHeight; }
if(this.Limit && iHeight > this._mxDown){ iHeight = this._mxDown; }
this.style_height = iHeight;
},
//修正左边
repairLeft: function(iWidth) {
//左边和上边比较麻烦因为还要计算left和top
//当少于最少宽度
if (iWidth < this.MinWidth){ iWidth = this.MinWidth; }
//当超过当前设定的最大宽度
else if(this.Limit && iWidth > this._mxLeft){ iWidth = this._mxLeft; }
//修改样式
this.style_width = iWidth;
this.style_left = this._obj.offsetLeft + this._obj.offsetWidth - iWidth;
},
//修正上边
repairUp: function(iHeight) {
if(iHeight < this.MinHeight){ iHeight = this.MinHeight; }
else if(this.Limit && iHeight > this._mxUp){ iHeight = this._mxUp; }
this.style_height = iHeight;
this.style_top = this._obj.offsetTop + this._obj.offsetHeight - iHeight;
},
//停止缩放
Stop: function() {
//移除事件
removeEventHandler(document, "mousemove", this._fR);
removeEventHandler(document, "mouseup", this._fS);
if(isIE){
removeEventHandler(this._touch, "losecapture", this._fS);
this._touch.releaseCapture();
}else{
removeEventHandler(window, "blur", this._fS);
}
this._touch = null;
}
};

//图片切割
var ImgCropper = Class.create();
ImgCropper.prototype = {
//容器对象,拖放缩放对象,图片地址,宽度,高度
initialize: function(container, drag, url, width, height, options) {
var oThis = this;

//容器对象
this.Container = $(container);
this.Container.style.position = "relative";
this.Container.style.overflow = "hidden";

//拖放对象
this.Drag = $(drag);
this.Drag.style.cursor = "move";
this.Drag.style.zIndex = 200;
if(isIE){
//设置overflow解决ie6的渲染问题(缩放时填充对象高度的问题)
this.Drag.style.overflow = "hidden";
//ie下用一个透明的层填充拖放对象不填充的话onmousedown会失效(未知原因)
(function(style){
style.width = style.height = "100%"; style.backgroundColor = "#fff"; style.filter = "alpha(opacity:0)";
})(this.Drag.appendChild(document.createElement("div")).style)
}else{
//插入字符解决ff下捕获失效的问题
this.Drag.innerHTML += "<font size='1px'> </font>";
}

this._pic = this.Container.appendChild(document.createElement("img"));//图片对象
this._cropper = this.Container.appendChild(document.createElement("img"));//切割对象
this._pic.style.position = this._cropper.style.position = "absolute";
this._pic.style.top = this._pic.style.left = this._cropper.style.top = this._cropper.style.left = "0";//对齐
this._cropper.style.zIndex = 100;
this._cropper.onload = function(){ oThis.SetPos(); }

this.Url = url;//图片地址
this.Width = parseInt(width);//宽度
this.Height = parseInt(height);//高度

this.SetOptions(options);

this.Opacity = parseInt(this.options.Opacity);
this.dragTop = parseInt(this.options.dragTop);
this.dragLeft = parseInt(this.options.dragLeft);
this.dragWidth = parseInt(this.options.dragWidth);
this.dragHeight = parseInt(this.options.dragHeight);

//设置预览对象
this.View = $(this.options.View) || null;//预览对象
this.viewWidth = parseInt(this.options.viewWidth);
this.viewHeight = parseInt(this.options.viewHeight);
this._view = null;//预览图片对象
if(this.View){
this.View.style.position = "relative";
this.View.style.overflow = "hidden";
this._view = this.View.appendChild(document.createElement("img"));
this._view.style.position = "absolute";
}

this.Scale = parseInt(this.options.Scale);

//设置拖放
this._drag = new Drag(this.Drag, this.Drag, { Limit: true, onMove: function(){ oThis.SetPos(); } });
//设置缩放
this._resize = this.GetResize();

this.Init();
},
//设置默认属性
SetOptions: function(options) {
this.options = {//默认值
Opacity: 50,//透明度(0到100)
//拖放位置和宽高
dragTop: 0,
dragLeft: 0,
dragWidth: 100,
dragHeight: 100,
//缩放触发对象
Right: "",
Left: "",
Up: "",
Down: "",
RightDown: "",
LeftDown: "",
RightUp: "",
LeftUp: "",
Scale: false,//是否按比例缩放
//预览对象设置
View: "",//预览对象
viewWidth: 100,//预览宽度
viewHeight: 100//预览高度
};
Object.extend(this.options, options || {});
},
//初始化对象
Init: function() {
var oThis = this;

//设置容器
this.Container.style.width = this.Width + "px";
this.Container.style.height = this.Height + "px";

//设置拖放对象
this.Drag.style.top = this.dragTop + "px";
this.Drag.style.left = this.dragLeft + "px";
this.Drag.style.width = this.dragWidth + "px";
this.Drag.style.height = this.dragHeight + "px";

//设置切割对象
this._pic.src = this._cropper.src = this.Url;
this._pic.style.width = this._cropper.style.width = this.Width + "px";
this._pic.style.height = this._cropper.style.height = this.Height + "px";
if(isIE){
this._pic.style.filter = "alpha(opacity:" + this.Opacity + ")";
} else {
this._pic.style.opacity = this.Opacity / 100;
}

//设置预览对象
if(this.View){ this._view.src = this.Url; }

//设置拖放
this._drag.mxRight = this.Width; this._drag.mxBottom = this.Height;
//设置缩放
if(this._resize){ this._resize.mxRight = this.Width; this._resize.mxBottom = this.Height; this._resize.Scale = this.Scale; }
},
//设置获取缩放对象
GetResize: function() {
var op = this.options;
//有触发对象时才设置
if(op.RightDown || op.LeftDown || op.RightUp || op.LeftUp || op.Right || op.Left || op.Up || op.Down ){
var oThis = this, _resize = new Resize(this.Drag, { Limit: true, onResize: function(){ oThis.SetPos(); } });

//设置缩放触发对象
if(op.RightDown){ _resize.Set(op.RightDown, "right-down"); }
if(op.LeftDown){ _resize.Set(op.LeftDown, "left-down"); }

if(op.RightUp){ _resize.Set(op.RightUp, "right-up"); }
if(op.LeftUp){ _resize.Set(op.LeftUp, "left-up"); }

if(op.Right){ _resize.Set(op.Right, "right"); }
if(op.Left){ _resize.Set(op.Left, "left"); }

if(op.Up){ _resize.Set(op.Up, "up"); }
if(op.Down){ _resize.Set(op.Down, "down"); }

return _resize;
} else { return null; }
},
//设置切割
SetPos: function() {
var o = this.Drag;
//按拖放对象的参数进行切割
this._cropper.style.clip = "rect(" + o.offsetTop + "px " + (o.offsetLeft + o.offsetWidth) + "px " + (o.offsetTop + o.offsetHeight) + "px " + o.offsetLeft + "px)";
//切割预览
if(this.View) this.PreView();
},
//切割预览
PreView: function() {
//按比例设置宽度和高度
var o = this.Drag, h = this.viewWidth, w = h * o.offsetWidth / o.offsetHeight;
if(w > this.viewHeight){ w = this.viewHeight; h = w * o.offsetHeight / o.offsetWidth; }
//获取对应比例尺寸
var scale = h / o.offsetHeight, ph = this.Height * scale, pw = this.Width * scale, pt = o.offsetTop * scale, pl = o.offsetLeft * scale, styleView = this._view.style;
//设置样式
styleView.width = pw + "px"; styleView.height = ph + "px";
styleView.top = - pt + "px "; styleView.left = - pl + "px";
//切割预览图
styleView.clip = "rect(" + pt + "px " + (pl + w) + "px " + (pt + h) + "px " + pl + "px)";
}
}

var ic = new ImgCropper("bgDiv", "dragDiv", "http://hi.csdn.net/attachment/201101/13/7494075_1294909002i6il.jpg", 400, 500, {
dragTop: 50, dragLeft: 50,
Right: "rRight", Left: "rLeft", Up: "rUp", Down: "rDown",
RightDown: "rRightDown", LeftDown: "rLeftDown", RightUp: "rRightUp", LeftUp: "rLeftUp",
View: "viewDiv", viewWidth: 200, viewHeight: 200
})
</script>
<script>

//设置图片大小
function Size(w, h){
ic.Width = w;
ic.Height = h;
ic.Init();
}
//换图片
function Pic(url){
ic.Url = url;
ic.Init();
}
//设置透明度
function Opacity(i){
ic.Opacity = i;
ic.Init();
}
//是否使用比例
function Scale(b){
ic.Scale = b;
ic.Init();
}