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图片切割js代码

时间:2022-03-31 11:59  来源:未知  阅读次数: 分享复制 评论打赏

//图片切割
 
var ImgCropper = Class.create();
 
ImgCropper.prototype = {
 
  //容器对象,控制层,图片地址
 
  initialize: function(container, handle, url, options) {
 
this._Container = $(container);//容器对象
 
this._layHandle = $(handle);//控制层
 
this.Url = url;//图片地址
 
 
 
this._layBase = this._Container.appendChild(document.createElement("img"));//底层
 
this._layCropper = this._Container.appendChild(document.createElement("img"));//切割层
 
this._layCropper.onl = Bind(this, this.SetPos);
 
//用来设置大小
 
this._tempImg = document.createElement("img");
 
this._tempImg.onl = Bind(this, this.SetSize);
 
 
 
this.SetOptions(options);
 
 
 
this.Opacity = Math.round(this.options.Opacity);
 
this.Color = this.options.Color;
 
this.Scale = !!this.options.Scale;
 
this.Ratio = Math.max(this.options.Ratio, 0);
 
this.Width = Math.round(this.options.Width);
 
this.Height = Math.round(this.options.Height);
 
 
 
//设置预览对象
 
var oPreview = $(this.options.Preview);//预览对象
 
if(oPreview){
 
oPreview.style.position = "relative";
 
oPreview.style.overflow = "hidden";
 
this.viewWidth = Math.round(this.options.viewWidth);
 
this.viewHeight = Math.round(this.options.viewHeight);
 
//预览图片对象
 
this._view = oPreview.appendChild(document.createElement("img"));
 
this._view.style.position = "absolute";
 
this._view.onl = Bind(this, this.SetPreview);
 
}
 
//设置拖放
 
this._drag = new Drag(this._layHandle, { Limit: true, onMove: Bind(this, this.SetPos), Transparent: true });
 
//设置缩放
 
this.Resize = !!this.options.Resize;
 
if(this.Resize){
 
var op = this.options, _resize = new Resize(this._layHandle, { Max: true, onResize: Bind(this, this.SetPos) });
 
//设置缩放触发对象
 
op.RightDown && (_resize.Set(op.RightDown, "right-down"));
 
op.LeftDown && (_resize.Set(op.LeftDown, "left-down"));
 
op.RightUp && (_resize.Set(op.RightUp, "right-up"));
 
op.LeftUp && (_resize.Set(op.LeftUp, "left-up"));
 
op.Right && (_resize.Set(op.Right, "right"));
 
op.Left && (_resize.Set(op.Left, "left"));
 
op.Down && (_resize.Set(op.Down, "down"));
 
op.Up && (_resize.Set(op.Up, "up"));
 
//最小范围限制
 
this.Min = !!this.options.Min;
 
this.minWidth = Math.round(this.options.minWidth);
 
this.minHeight = Math.round(this.options.minHeight);
 
//设置缩放对象
 
this._resize = _resize;
 
}
 
//设置样式
 
this._Container.style.position = "relative";
 
this._Container.style.overflow = "hidden";
 
this._layHandle.style.zIndex = 200;
 
this._layCropper.style.zIndex = 100;
 
this._layBase.style.position = this._layCropper.style.position = "absolute";
 
this._layBase.style.top = this._layBase.style.left = this._layCropper.style.top = this._layCropper.style.left = 0;//对齐
 
//初始化设置
 
this.Init();
 
  },
 
  //设置默认属性
 
  SetOptions: function(options) {
 
    this.options = {//默认值
 
Opacity: 50,//透明度(0到100)
 
Color: "",//背景色
 
Width: 0,//图片高度
 
Height: 0,//图片高度
 
//缩放触发对象
 
Resize: false,//是否设置缩放
 
Right: "",//右边缩放对象
 
Left: "",//左边缩放对象
 
Up: "",//上边缩放对象
 
Down: "",//下边缩放对象
 
RightDown: "",//右下缩放对象
 
LeftDown: "",//左下缩放对象
 
RightUp: "",//右上缩放对象
 
LeftUp: "",//左上缩放对象
 
Min: false,//是否最小宽高限制(为true时下面min参数有用)
 
minWidth: 50,//最小宽度
 
minHeight: 50,//最小高度
 
Scale: false,//是否按比例缩放
 
Ratio: 0,//缩放比例(宽/高)
 
//预览对象设置
 
Preview: "",//预览对象
 
viewWidth: 0,//预览宽度
 
viewHeight: 0//预览高度
 
    };
 
    Extend(this.options, options || {});
 
  },
 
  //初始化对象
 
  Init: function() {
 
//设置背景色
 
this.Color && (this._Container.style.backgroundColor = this.Color);
 
//设置图片
 
this._tempImg.src = this._layBase.src = this._layCropper.src = this.Url;
 
//设置透明
 
if(isIE){
 
this._layBase.style.filter = "alpha(opacity:" + this.Opacity + ")";
 
} else {
 
this._layBase.style.opacity = this.Opacity / 100;
 
}
 
//设置预览对象
 
this._view && (this._view.src = this.Url);
 
//设置缩放
 
if(this.Resize){
 
with(this._resize){
 
Scale = this.Scale; Ratio = this.Ratio; Min = this.Min; minWidth = this.minWidth; minHeight = this.minHeight;
 
}
 
}
 
  },
 
  //设置切割样式
 
  SetPos: function() {
 
var p = this.GetPos();
 
//按拖放对象的参数进行切割
 
this._layCropper.style.clip = "rect(" + p.Top + "px " + (p.Left + p.Width) + "px " + (p.Top + p.Height) + "px " + p.Left + "px)";
 
//设置预览
 
this.SetPreview();
 
  },
 
  //设置预览效果
 
  SetPreview: function() {
 
if(this._view){
 
//预览显示的宽和高
 
var p = this.GetPos(), s = this.GetSize(p.Width, p.Height, this.viewWidth, this.viewHeight), scale = s.Height / p.Height;
 
//按比例设置参数
 
var pHeight = this._layBase.height * scale, pWidth = this._layBase.width * scale, pTop = p.Top * scale, pLeft = p.Left * scale;
 
//设置预览对象
 
with(this._view.style){
 
//设置样式
 
width = pWidth + "px"; height = pHeight + "px"; top = - pTop + "px "; left = - pLeft + "px";
 
//切割预览图
 
clip = "rect(" + pTop + "px " + (pLeft + s.Width) + "px " + (pTop + s.Height) + "px " + pLeft + "px)";
 
}
 
}
 
  },
 
  //设置图片大小
 
  SetSize: function() {
 
var s = this.GetSize(this._tempImg.width, this._tempImg.height, this.Width, this.Height);
 
//设置底图和切割图
 
this._layBase.style.width = this._layCropper.style.width = s.Width + "px";
 
this._layBase.style.height = this._layCropper.style.height = s.Height + "px";
 
//设置拖放范围
 
this._drag.mxRight = s.Width; this._drag.mxBottom = s.Height;
 
//设置缩放范围
 
if(this.Resize){ this._resize.mxRight = s.Width; this._resize.mxBottom = s.Height; }
 
  },
 
  //获取当前样式
 
  GetPos: function() {
 
with(this._layHandle){
 
return { Top: offsetTop, Left: offsetLeft, Width: offsetWidth, Height: offsetHeight }
 
}
 
  },
 
  //获取尺寸
 
  GetSize: function(nowWidth, nowHeight, fixWidth, fixHeight) {
 
var iWidth = nowWidth, iHeight = nowHeight, scale = iWidth / iHeight;
 
//按比例设置
 
if(fixHeight){ iWidth = (iHeight = fixHeight) * scale; }
 
if(fixWidth && (!fixHeight || iWidth > fixWidth)){ iHeight = (iWidth = fixWidth) / scale; }
 
//返回尺寸对象
 
return { Width: iWidth, Height: iHeight }
 
  }
 
}
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