JavaScript 图片切割成效(带拖拽,缩放,区域限制) _JavaScript

JavaScript 图片切割效果(带拖拽,缩放,区域限制)

?JavaScript 图片切割效果(带拖拽,缩放,区域限制)

<!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://images.cnblogs.com/cnblogs_com/cloudgamer/143727/r_min.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();
}

</script>
<br />
<br />
<div>
? <input name="" type="button" value=" 增肥 " onclick="Size(500,400)" />
? <input name="" type="button" value=" 还原 " onclick="Size(300,400)" />
</div>

</body>
</html>

运行效果图：