HTML5 canvas处理图片的各种效果，包括放大缩小涂鸦等

http://www.htmleaf.com/ziliaoku/qianduanjiaocheng/201502151385.html

jQuery 缩放 旋转 裁剪图片 Image Cropper

A simple jQuery image cropping plugin. 

https://fengyuanchen.github.io/cropper

涂鸦效果

https://github.com/Leimi/drawingboard.js#drawingboardjs

全局定义，从而实现涂鸦的undo，redo，reset

imageBoard = window.imageBoard;
$(".picLabel").click(function() {
    $("#firstStep").hide();
    $("#zbeubeu").show();
    $("#drawing-board").css("width",$(".cropper-canvas img").width());
    $("#drawing-board").css("height",$(".cropper-canvas img").height());

    imageBoard = new DrawingBoard.Board('drawing-board', {
        background: "http://test.file.tiplus.cn/task/16443/1452588926.598544.jpg?timestamp=1481096992278",
        color: "#d00",
        size: 3,
        controls: false,
        //controls: [
        //'Navigation',
        //],
        webStorage:false,
        //webStorage: 'session',
        enlargeYourContainer: true,
        stretchImg: true,
        droppable: true,
        //controlsPosition:"bottom center"
    }); 
    $(".cropper-container").hide();
    $(".drawing-board-canvas-wrapper").css("width", $(".cropper-canvas").css("witdh"));
    $(".drawing-board-canvas-wrapper").css("height", $(".cropper-canvas").css("height"));
    $(".drawing-board-canvas-wrapper").css("left", $(".cropper-canvas").css("left"));
    $(".drawing-board-canvas-wrapper").css("top", $(".cropper-canvas").css("top"));

    $("#secondStep").show();

})
$("#undo").click(function(){
    //imageBoard.downloadImg();
    imageBoard.goBackInHistory();
})
$("#redo").click(function(){
    //imageBoard.downloadImg();
    imageBoard.goForthInHistory();
})
$(".destroy").click(function(){
    //imageBoard.downloadImg();
    imageBoard.reset({ background: true });
})

可以实现图片放大缩小，可以在途中增加文字：

https://github.com/lamida/canvas-draw-undo

http://jsfiddle.net/epistemex/95r85zh4/

http://phrogz.net/tmp/canvas_zoom_to_cursor.html

图片放大缩小拖放

通过cropper完成canvas的旋转、放大或者缩小，修改cropper使得drawingboardjs也同步修改

    var $image = $('#image');
    $image.cropper({
      aspectRatio: 16 / 9,
      movable: true,
      dragMode:'move',
      crop: function(e) {
        // Output the result data for cropping image.
      },
      built: function () {
        croppable = true;
      }
    });
    setTimeout(function(){
        clearCanvas(); 
    }, 1000);
    $(".rotate").click(function(){
        var croppedCanvas;
        if (!croppable) {
          return;
        }
        croppedCanvas = $image.cropper('rotate', -90);
        $(".cropper-canvas img").css("display","none");
    });
    $(".enlarge_pic").click(function(){
        var croppedCanvas;
        if (!croppable) {
          return;
        }
        croppedCanvas = $image.cropper('zoom', 0.1);
        $(".cropper-canvas img").css("display","none");
    });
    $(".shrink_pic").click(function(){
        var croppedCanvas;
        if (!croppable) {
          return;
        }
        croppedCanvas = $image.cropper('zoom', -0.1);
        $(".cropper-canvas img").css("display","none");
    });

修改后的cropper文件：

/*!
 * Cropper v2.3.4
 * https://github.com/fengyuanchen/cropper
 *
 * Copyright (c) 2014-2016 Fengyuan Chen and contributors
 * Released under the MIT license
 *
 * Date: 2016-09-03T05:50:45.412Z
 */

(function (factory) {
  if (typeof define === 'function' && define.amd) {
    // AMD. Register as anonymous module.
    define(['jquery'], factory);
  } else if (typeof exports === 'object') {
    // Node / CommonJS
    factory(require('jquery'));
  } else {
    // Browser globals.
    factory(jQuery);
  }
})(function ($) {

  'use strict';

  // Globals
  var $window = $(window);
  var $document = $(document);
  var location = window.location;
  var navigator = window.navigator;
  var ArrayBuffer = window.ArrayBuffer;
  var Uint8Array = window.Uint8Array;
  var DataView = window.DataView;
  var btoa = window.btoa;

  // Constants
  var NAMESPACE = 'cropper';

  // Classes
  var CLASS_MODAL = 'cropper-modal';
  var CLASS_HIDE = 'cropper-hide';
  var CLASS_HIDDEN = 'cropper-hidden';
  var CLASS_INVISIBLE = 'cropper-invisible';
  var CLASS_MOVE = 'cropper-move';
  var CLASS_CROP = 'cropper-crop';
  var CLASS_DISABLED = 'cropper-disabled';
  var CLASS_BG = 'cropper-bg';

  // Events
  var EVENT_MOUSE_DOWN = 'mousedown touchstart pointerdown MSPointerDown';
  var EVENT_MOUSE_MOVE = 'mousemove touchmove pointermove MSPointerMove';
  var EVENT_MOUSE_UP = 'mouseup touchend touchcancel pointerup pointercancel MSPointerUp MSPointerCancel';
  var EVENT_WHEEL = 'wheel mousewheel DOMMouseScroll';
  var EVENT_DBLCLICK = 'dblclick';
  var EVENT_LOAD = 'load.' + NAMESPACE;
  var EVENT_ERROR = 'error.' + NAMESPACE;
  var EVENT_RESIZE = 'resize.' + NAMESPACE; // Bind to window with namespace
  var EVENT_BUILD = 'build.' + NAMESPACE;
  var EVENT_BUILT = 'built.' + NAMESPACE;
  var EVENT_CROP_START = 'cropstart.' + NAMESPACE;
  var EVENT_CROP_MOVE = 'cropmove.' + NAMESPACE;
  var EVENT_CROP_END = 'cropend.' + NAMESPACE;
  var EVENT_CROP = 'crop.' + NAMESPACE;
  var EVENT_ZOOM = 'zoom.' + NAMESPACE;

  // RegExps
  var REGEXP_ACTIONS = /^(e|w|s|n|se|sw|ne|nw|all|crop|move|zoom)$/;
  var REGEXP_DATA_URL = /^data:/;
  var REGEXP_DATA_URL_HEAD = /^data:([^;]+);base64,/;
  var REGEXP_DATA_URL_JPEG = /^data:image/jpeg.*;base64,/;

  // Data keys
  var DATA_PREVIEW = 'preview';
  var DATA_ACTION = 'action';

  // Actions
  var ACTION_EAST = 'e';
  var ACTION_WEST = 'w';
  var ACTION_SOUTH = 's';
  var ACTION_NORTH = 'n';
  var ACTION_SOUTH_EAST = 'se';
  var ACTION_SOUTH_WEST = 'sw';
  var ACTION_NORTH_EAST = 'ne';
  var ACTION_NORTH_WEST = 'nw';
  var ACTION_ALL = 'all';
  var ACTION_CROP = 'crop';
  var ACTION_MOVE = 'move';
  var ACTION_ZOOM = 'zoom';
  var ACTION_NONE = 'none';

  // Supports
  var SUPPORT_CANVAS = $.isFunction($('<canvas>')[0].getContext);
  var IS_SAFARI_OR_UIWEBVIEW = navigator && /(Macintosh|iPhone|iPod|iPad).*AppleWebKit/i.test(navigator.userAgent);

  // Maths
  var num = Number;
  var min = Math.min;
  var max = Math.max;
  var abs = Math.abs;
  var sin = Math.sin;
  var cos = Math.cos;
  var sqrt = Math.sqrt;
  var round = Math.round;
  var floor = Math.floor;

  // Utilities
  var fromCharCode = String.fromCharCode;

  function isNumber(n) {
    return typeof n === 'number' && !isNaN(n);
  }

  function isUndefined(n) {
    return typeof n === 'undefined';
  }

  function toArray(obj, offset) {
    var args = [];

    // This is necessary for IE8
    if (isNumber(offset)) {
      args.push(offset);
    }

    return args.slice.apply(obj, args);
  }

  // Custom proxy to avoid jQuery's guid
  function proxy(fn, context) {
    var args = toArray(arguments, 2);

    return function () {
      return fn.apply(context, args.concat(toArray(arguments)));
    };
  }

  function isCrossOriginURL(url) {
    var parts = url.match(/^(https?:)//([^:/?#]+):?(d*)/i);

    return parts && (
      parts[1] !== location.protocol ||
      parts[2] !== location.hostname ||
      parts[3] !== location.port
    );
  }

  function addTimestamp(url) {
    var timestamp = 'timestamp=' + (new Date()).getTime();

    return (url + (url.indexOf('?') === -1 ? '?' : '&') + timestamp);
  }

  function getCrossOrigin(crossOrigin) {
    return crossOrigin ? ' crossOrigin="' + crossOrigin + '"' : '';
  }

  function getImageSize(image, callback) {
    var newImage;

    // Modern browsers (ignore Safari, #120 & #509)
    if (image.naturalWidth && !IS_SAFARI_OR_UIWEBVIEW) {
      return callback(image.naturalWidth, image.naturalHeight);
    }

    // IE8: Don't use `new Image()` here (#319)
    newImage = document.createElement('img');

    newImage.onload = function () {
      callback(this.width, this.height);
    };

    newImage.src = image.src;
  }

  function getTransform(options) {
    var transforms = [];
    var rotate = options.rotate;
    var scaleX = options.scaleX;
    var scaleY = options.scaleY;

    // Rotate should come first before scale to match orientation transform
    if (isNumber(rotate) && rotate !== 0) {
      transforms.push('rotate(' + rotate + 'deg)');
    }

    if (isNumber(scaleX) && scaleX !== 1) {
      transforms.push('scaleX(' + scaleX + ')');
    }

    if (isNumber(scaleY) && scaleY !== 1) {
      transforms.push('scaleY(' + scaleY + ')');
    }

    return transforms.length ? transforms.join(' ') : 'none';
  }

  function getRotatedSizes(data, isReversed) {
    var deg = abs(data.degree) % 180;
    var arc = (deg > 90 ? (180 - deg) : deg) * Math.PI / 180;
    var sinArc = sin(arc);
    var cosArc = cos(arc);
    var width = data.width;
    var height = data.height;
    var aspectRatio = data.aspectRatio;
    var newWidth;
    var newHeight;

    if (!isReversed) {
      newWidth = width * cosArc + height * sinArc;
      newHeight = width * sinArc + height * cosArc;
    } else {
      newWidth = width / (cosArc + sinArc / aspectRatio);
      newHeight = newWidth / aspectRatio;
    }

    return {
       newWidth,
      height: newHeight
    };
  }

  function getSourceCanvas(image, data) {
    var canvas = $('<canvas>')[0];
    var context = canvas.getContext('2d');
    var dstX = 0;
    var dstY = 0;
    var dstWidth = data.naturalWidth;
    var dstHeight = data.naturalHeight;
    var rotate = data.rotate;
    var scaleX = data.scaleX;
    var scaleY = data.scaleY;
    var scalable = isNumber(scaleX) && isNumber(scaleY) && (scaleX !== 1 || scaleY !== 1);
    var rotatable = isNumber(rotate) && rotate !== 0;
    var advanced = rotatable || scalable;
    var canvasWidth = dstWidth * abs(scaleX || 1);
    var canvasHeight = dstHeight * abs(scaleY || 1);
    var translateX;
    var translateY;
    var rotated;

    if (scalable) {
      translateX = canvasWidth / 2;
      translateY = canvasHeight / 2;
    }

    if (rotatable) {
      rotated = getRotatedSizes({
         canvasWidth,
        height: canvasHeight,
        degree: rotate
      });

      canvasWidth = rotated.width;
      canvasHeight = rotated.height;
      translateX = canvasWidth / 2;
      translateY = canvasHeight / 2;
    }

    canvas.width = canvasWidth;
    canvas.height = canvasHeight;

    if (advanced) {
      dstX = -dstWidth / 2;
      dstY = -dstHeight / 2;

      context.save();
      context.translate(translateX, translateY);
    }

    // Rotate should come first before scale as in the "getTransform" function
    if (rotatable) {
      context.rotate(rotate * Math.PI / 180);
    }

    if (scalable) {
      context.scale(scaleX, scaleY);
    }

    context.drawImage(image, floor(dstX), floor(dstY), floor(dstWidth), floor(dstHeight));

    if (advanced) {
      context.restore();
    }

    return canvas;
  }

  function getTouchesCenter(touches) {
    var length = touches.length;
    var pageX = 0;
    var pageY = 0;

    if (length) {
      $.each(touches, function (i, touch) {
        pageX += touch.pageX;
        pageY += touch.pageY;
      });

      pageX /= length;
      pageY /= length;
    }

    return {
      pageX: pageX,
      pageY: pageY
    };
  }

  function getStringFromCharCode(dataView, start, length) {
    var str = '';
    var i;

    for (i = start, length += start; i < length; i++) {
      str += fromCharCode(dataView.getUint8(i));
    }

    return str;
  }

  function getOrientation(arrayBuffer) {
    var dataView = new DataView(arrayBuffer);
    var length = dataView.byteLength;
    var orientation;
    var exifIDCode;
    var tiffOffset;
    var firstIFDOffset;
    var littleEndian;
    var endianness;
    var app1Start;
    var ifdStart;
    var offset;
    var i;

    // Only handle JPEG image (start by 0xFFD8)
    if (dataView.getUint8(0) === 0xFF && dataView.getUint8(1) === 0xD8) {
      offset = 2;

      while (offset < length) {
        if (dataView.getUint8(offset) === 0xFF && dataView.getUint8(offset + 1) === 0xE1) {
          app1Start = offset;
          break;
        }

        offset++;
      }
    }

    if (app1Start) {
      exifIDCode = app1Start + 4;
      tiffOffset = app1Start + 10;

      if (getStringFromCharCode(dataView, exifIDCode, 4) === 'Exif') {
        endianness = dataView.getUint16(tiffOffset);
        littleEndian = endianness === 0x4949;

        if (littleEndian || endianness === 0x4D4D /* bigEndian */) {
          if (dataView.getUint16(tiffOffset + 2, littleEndian) === 0x002A) {
            firstIFDOffset = dataView.getUint32(tiffOffset + 4, littleEndian);

            if (firstIFDOffset >= 0x00000008) {
              ifdStart = tiffOffset + firstIFDOffset;
            }
          }
        }
      }
    }

    if (ifdStart) {
      length = dataView.getUint16(ifdStart, littleEndian);

      for (i = 0; i < length; i++) {
        offset = ifdStart + i * 12 + 2;

        if (dataView.getUint16(offset, littleEndian) === 0x0112 /* Orientation */) {

          // 8 is the offset of the current tag's value
          offset += 8;

          // Get the original orientation value
          orientation = dataView.getUint16(offset, littleEndian);

          // Override the orientation with its default value for Safari (#120)
          if (IS_SAFARI_OR_UIWEBVIEW) {
            dataView.setUint16(offset, 1, littleEndian);
          }

          break;
        }
      }
    }

    return orientation;
  }

  function dataURLToArrayBuffer(dataURL) {
    var base64 = dataURL.replace(REGEXP_DATA_URL_HEAD, '');
    var binary = atob(base64);
    var length = binary.length;
    var arrayBuffer = new ArrayBuffer(length);
    var dataView = new Uint8Array(arrayBuffer);
    var i;

    for (i = 0; i < length; i++) {
      dataView[i] = binary.charCodeAt(i);
    }

    return arrayBuffer;
  }

  // Only available for JPEG image
  function arrayBufferToDataURL(arrayBuffer) {
    var dataView = new Uint8Array(arrayBuffer);
    var length = dataView.length;
    var base64 = '';
    var i;

    for (i = 0; i < length; i++) {
      base64 += fromCharCode(dataView[i]);
    }

    return 'data:image/jpeg;base64,' + btoa(base64);
  }

  function Cropper(element, options) {
    this.$element = $(element);
    this.options = $.extend({}, Cropper.DEFAULTS, $.isPlainObject(options) && options);
    this.isLoaded = false;
    this.isBuilt = false;
    this.isCompleted = false;
    this.isRotated = false;
    this.isCropped = false;
    this.isDisabled = false;
    this.isReplaced = false;
    this.isLimited = false;
    this.wheeling = false;
    this.isImg = false;
    this.originalUrl = '';
    this.canvas = null;
    this.cropBox = null;
    this.init();
  }

  Cropper.prototype = {
    constructor: Cropper,

    init: function () {
      var $this = this.$element;
      var url;

      if ($this.is('img')) {
        this.isImg = true;

        // Should use `$.fn.attr` here. e.g.: "img/picture.jpg"
        this.originalUrl = url = $this.attr('src');

        // Stop when it's a blank image
        if (!url) {
          return;
        }

        // Should use `$.fn.prop` here. e.g.: "http://example.com/img/picture.jpg"
        url = $this.prop('src');
      } else if ($this.is('canvas') && SUPPORT_CANVAS) {
        url = $this[0].toDataURL();
      }

      this.load(url);
    },

    // A shortcut for triggering custom events
    trigger: function (type, data) {
      var e = $.Event(type, data);

      this.$element.trigger(e);

      return e;
    },

    load: function (url) {
      var options = this.options;
      var $this = this.$element;
      var read;
      var xhr;

      if (!url) {
        return;
      }

      // Trigger build event first
      $this.one(EVENT_BUILD, options.build);

      if (this.trigger(EVENT_BUILD).isDefaultPrevented()) {
        return;
      }

      this.url = url;
      this.image = {};

      if (!options.checkOrientation || !ArrayBuffer) {
        return this.clone();
      }

      read = $.proxy(this.read, this);

      // XMLHttpRequest disallows to open a Data URL in some browsers like IE11 and Safari
      if (REGEXP_DATA_URL.test(url)) {
        return REGEXP_DATA_URL_JPEG.test(url) ?
          read(dataURLToArrayBuffer(url)) :
          this.clone();
      }

      xhr = new XMLHttpRequest();

      xhr.onerror = xhr.onabort = $.proxy(function () {
        this.clone();
      }, this);

      xhr.onload = function () {
        read(this.response);
      };

      if (options.checkCrossOrigin && isCrossOriginURL(url) && $this.prop('crossOrigin')) {
        url = addTimestamp(url);
      }

      xhr.open('get', url);
      xhr.responseType = 'arraybuffer';
      xhr.send();
    },

    read: function (arrayBuffer) {
      var options = this.options;
      var orientation = getOrientation(arrayBuffer);
      var image = this.image;
      var rotate = 0;
      var scaleX = 1;
      var scaleY = 1;

      if (orientation > 1) {
        this.url = arrayBufferToDataURL(arrayBuffer);

        switch (orientation) {

          // flip horizontal
          case 2:
            scaleX = -1;
            break;

          // rotate left 180°
          case 3:
            rotate = -180;
            break;

          // flip vertical
          case 4:
            scaleY = -1;
            break;

          // flip vertical + rotate right 90°
          case 5:
            rotate = 90;
            scaleY = -1;
            break;

          // rotate right 90°
          case 6:
            rotate = 90;
            break;

          // flip horizontal + rotate right 90°
          case 7:
            rotate = 90;
            scaleX = -1;
            break;

          // rotate left 90°
          case 8:
            rotate = -90;
            break;
        }
      }

      if (options.rotatable) {
        image.rotate = rotate;
      }

      if (options.scalable) {
        image.scaleX = scaleX;
        image.scaleY = scaleY;
      }

      this.clone();
    },

    clone: function () {
      var options = this.options;
      var $this = this.$element;
      var url = this.url;
      var crossOrigin = '';
      var crossOriginUrl;
      var $clone;

      if (options.checkCrossOrigin && isCrossOriginURL(url)) {
        crossOrigin = $this.prop('crossOrigin');

        if (crossOrigin) {
          crossOriginUrl = url;
        } else {
          crossOrigin = 'anonymous';

          // Bust cache (#148) when there is not a "crossOrigin" property
          crossOriginUrl = addTimestamp(url);
        }
      }

      this.crossOrigin = crossOrigin;
      this.crossOriginUrl = crossOriginUrl;
      this.$clone = $clone = $('<img' + getCrossOrigin(crossOrigin) + ' src="' + (crossOriginUrl || url) + '">');

      if (this.isImg) {
        if ($this[0].complete) {
          this.start();
        } else {
          $this.one(EVENT_LOAD, $.proxy(this.start, this));
        }
      } else {
        $clone.
          one(EVENT_LOAD, $.proxy(this.start, this)).
          one(EVENT_ERROR, $.proxy(this.stop, this)).
          addClass(CLASS_HIDE).
          insertAfter($this);
      }
    },

    start: function () {
      var $image = this.$element;
      var $clone = this.$clone;

      if (!this.isImg) {
        $clone.off(EVENT_ERROR, this.stop);
        $image = $clone;
      }

      getImageSize($image[0], $.proxy(function (naturalWidth, naturalHeight) {
        $.extend(this.image, {
          naturalWidth: naturalWidth,
          naturalHeight: naturalHeight,
          aspectRatio: naturalWidth / naturalHeight
        });

        this.isLoaded = true;
        this.build();
      }, this));
    },

    stop: function () {
      this.$clone.remove();
      this.$clone = null;
    },

    build: function () {
      var options = this.options;
      var $this = this.$element;
      var $clone = this.$clone;
      var $cropper;
      var $cropBox;
      var $face;

      if (!this.isLoaded) {
        return;
      }

      // Unbuild first when replace
      if (this.isBuilt) {
        this.unbuild();
      }

      // Create cropper elements
      this.$container = $this.parent();
      this.$cropper = $cropper = $(Cropper.TEMPLATE);
      this.$canvas = $cropper.find('.cropper-canvas').append($clone);
      this.$dragBox = $cropper.find('.cropper-drag-box');
      this.$cropBox = $cropBox = $cropper.find('.cropper-crop-box');
      this.$viewBox = $cropper.find('.cropper-view-box');
      this.$face = $face = $cropBox.find('.cropper-face');

      // Hide the original image
      $this.addClass(CLASS_HIDDEN).after($cropper);

      // Show the clone image if is hidden
      if (!this.isImg) {
        $clone.removeClass(CLASS_HIDE);
      }

      this.initPreview();
      this.bind();

      options.aspectRatio = max(0, options.aspectRatio) || NaN;
      options.viewMode = max(0, min(3, round(options.viewMode))) || 0;

      if (options.autoCrop) {
        this.isCropped = true;

        if (options.modal) {
          this.$dragBox.addClass(CLASS_MODAL);
        }
      } else {
        $cropBox.addClass(CLASS_HIDDEN);
      }

      if (!options.guides) {
        $cropBox.find('.cropper-dashed').addClass(CLASS_HIDDEN);
      }

      if (!options.center) {
        $cropBox.find('.cropper-center').addClass(CLASS_HIDDEN);
      }

      if (options.cropBoxMovable) {
        $face.addClass(CLASS_MOVE).data(DATA_ACTION, ACTION_ALL);
      }

      if (!options.highlight) {
        $face.addClass(CLASS_INVISIBLE);
      }

      if (options.background) {
        $cropper.addClass(CLASS_BG);
      }

      if (!options.cropBoxResizable) {
        $cropBox.find('.cropper-line, .cropper-point').addClass(CLASS_HIDDEN);
      }

      this.setDragMode(options.dragMode);
      this.render();
      this.isBuilt = true;
      this.setData(options.data);
      $this.one(EVENT_BUILT, options.built);

      // Trigger the built event asynchronously to keep `data('cropper')` is defined
      this.completing = setTimeout($.proxy(function () {
        this.trigger(EVENT_BUILT);
        this.trigger(EVENT_CROP, this.getData());
        this.isCompleted = true;
      }, this), 0);
    },

    unbuild: function () {
      if (!this.isBuilt) {
        return;
      }

      if (!this.isCompleted) {
        clearTimeout(this.completing);
      }

      this.isBuilt = false;
      this.isCompleted = false;
      this.initialImage = null;

      // Clear `initialCanvas` is necessary when replace
      this.initialCanvas = null;
      this.initialCropBox = null;
      this.container = null;
      this.canvas = null;

      // Clear `cropBox` is necessary when replace
      this.cropBox = null;
      this.unbind();

      this.resetPreview();
      this.$preview = null;

      this.$viewBox = null;
      this.$cropBox = null;
      this.$dragBox = null;
      this.$canvas = null;
      this.$container = null;

      this.$cropper.remove();
      this.$cropper = null;
    },

    render: function () {
      this.initContainer();
      this.initCanvas();
      this.initCropBox();

      this.renderCanvas();

      if (this.isCropped) {
        this.renderCropBox();
      }
    },

    initContainer: function () {
      var options = this.options;
      var $this = this.$element;
      var $container = this.$container;
      var $cropper = this.$cropper;

      $cropper.addClass(CLASS_HIDDEN);
      $this.removeClass(CLASS_HIDDEN);

      $cropper.css((this.container = {
         max($container.width(), num(options.minContainerWidth) || 200),
        height: max($container.height(), num(options.minContainerHeight) || 100)
      }));

      $this.addClass(CLASS_HIDDEN);
      $cropper.removeClass(CLASS_HIDDEN);
    },

    // Canvas (image wrapper)
    initCanvas: function () {
      var viewMode = this.options.viewMode;
      var container = this.container;
      var containerWidth = container.width;
      var containerHeight = container.height;
      var image = this.image;
      var imageNaturalWidth = image.naturalWidth;
      var imageNaturalHeight = image.naturalHeight;
      var is90Degree = abs(image.rotate) === 90;
      var naturalWidth = is90Degree ? imageNaturalHeight : imageNaturalWidth;
      var naturalHeight = is90Degree ? imageNaturalWidth : imageNaturalHeight;
      var aspectRatio = naturalWidth / naturalHeight;
      var canvasWidth = containerWidth;
      var canvasHeight = containerHeight;
      var canvas;

      if (containerHeight * aspectRatio > containerWidth) {
        if (viewMode === 3) {
          canvasWidth = containerHeight * aspectRatio;
        } else {
          canvasHeight = containerWidth / aspectRatio;
        }
      } else {
        if (viewMode === 3) {
          canvasHeight = containerWidth / aspectRatio;
        } else {
          canvasWidth = containerHeight * aspectRatio;
        }
      }
      canvasWidth = canvasWidth * 0.8;
      canvasHeight = canvasHeight * 0.8;

      canvas = {
        naturalWidth: naturalWidth,
        naturalHeight: naturalHeight,
        aspectRatio: aspectRatio,
         canvasWidth,
        height: canvasHeight
      };

      canvas.oldLeft = canvas.left = (containerWidth - canvasWidth) / 2;
      canvas.oldTop = canvas.top = (containerHeight - canvasHeight) / 2;

      this.canvas = canvas;
      this.isLimited = (viewMode === 1 || viewMode === 2);
      this.limitCanvas(true, true);
      this.initialImage = $.extend({}, image);
      this.initialCanvas = $.extend({}, canvas);
    },

    limitCanvas: function (isSizeLimited, isPositionLimited) {
      var options = this.options;
      var viewMode = options.viewMode;
      var container = this.container;
      var containerWidth = container.width;
      var containerHeight = container.height;
      var canvas = this.canvas;
      var aspectRatio = canvas.aspectRatio;
      var cropBox = this.cropBox;
      var isCropped = this.isCropped && cropBox;
      var minCanvasWidth;
      var minCanvasHeight;
      var newCanvasLeft;
      var newCanvasTop;

      if (isSizeLimited) {
        minCanvasWidth = num(options.minCanvasWidth) || 0;
        minCanvasHeight = num(options.minCanvasHeight) || 0;

        if (viewMode) {
          if (viewMode > 1) {
            minCanvasWidth = max(minCanvasWidth, containerWidth);
            minCanvasHeight = max(minCanvasHeight, containerHeight);

            if (viewMode === 3) {
              if (minCanvasHeight * aspectRatio > minCanvasWidth) {
                minCanvasWidth = minCanvasHeight * aspectRatio;
              } else {
                minCanvasHeight = minCanvasWidth / aspectRatio;
              }
            }
          } else {
            if (minCanvasWidth) {
              minCanvasWidth = max(minCanvasWidth, isCropped ? cropBox.width : 0);
            } else if (minCanvasHeight) {
              minCanvasHeight = max(minCanvasHeight, isCropped ? cropBox.height : 0);
            } else if (isCropped) {
              minCanvasWidth = cropBox.width;
              minCanvasHeight = cropBox.height;

              if (minCanvasHeight * aspectRatio > minCanvasWidth) {
                minCanvasWidth = minCanvasHeight * aspectRatio;
              } else {
                minCanvasHeight = minCanvasWidth / aspectRatio;
              }
            }
          }
        }

        if (minCanvasWidth && minCanvasHeight) {
          if (minCanvasHeight * aspectRatio > minCanvasWidth) {
            minCanvasHeight = minCanvasWidth / aspectRatio;
          } else {
            minCanvasWidth = minCanvasHeight * aspectRatio;
          }
        } else if (minCanvasWidth) {
          minCanvasHeight = minCanvasWidth / aspectRatio;
        } else if (minCanvasHeight) {
          minCanvasWidth = minCanvasHeight * aspectRatio;
        }

        canvas.minWidth = minCanvasWidth;
        canvas.minHeight = minCanvasHeight;
        canvas.maxWidth = Infinity;
        canvas.maxHeight = Infinity;
      }

      if (isPositionLimited) {
        if (viewMode) {
          newCanvasLeft = containerWidth - canvas.width;
          newCanvasTop = containerHeight - canvas.height;

          canvas.minLeft = min(0, newCanvasLeft);
          canvas.minTop = min(0, newCanvasTop);
          canvas.maxLeft = max(0, newCanvasLeft);
          canvas.maxTop = max(0, newCanvasTop);

          if (isCropped && this.isLimited) {
            canvas.minLeft = min(
              cropBox.left,
              cropBox.left + cropBox.width - canvas.width
            );
            canvas.minTop = min(
              cropBox.top,
              cropBox.top + cropBox.height - canvas.height
            );
            canvas.maxLeft = cropBox.left;
            canvas.maxTop = cropBox.top;

            if (viewMode === 2) {
              if (canvas.width >= containerWidth) {
                canvas.minLeft = min(0, newCanvasLeft);
                canvas.maxLeft = max(0, newCanvasLeft);
              }

              if (canvas.height >= containerHeight) {
                canvas.minTop = min(0, newCanvasTop);
                canvas.maxTop = max(0, newCanvasTop);
              }
            }
          }
        } else {
          canvas.minLeft = -canvas.width;
          canvas.minTop = -canvas.height;
          canvas.maxLeft = containerWidth;
          canvas.maxTop = containerHeight;
        }
      }
    },

    renderCanvas: function (isChanged) {
      var canvas = this.canvas;
      var image = this.image;
      var rotate = image.rotate;
      var naturalWidth = image.naturalWidth;
      var naturalHeight = image.naturalHeight;
      var aspectRatio;
      var rotated;

      if (this.isRotated) {
        this.isRotated = false;

        // Computes rotated sizes with image sizes
        rotated = getRotatedSizes({
           image.width,
          height: image.height,
          degree: rotate
        });

        aspectRatio = rotated.width / rotated.height;

        if (aspectRatio !== canvas.aspectRatio) {
          canvas.left -= (rotated.width - canvas.width) / 2;
          canvas.top -= (rotated.height - canvas.height) / 2;
          canvas.width = rotated.width;
          canvas.height = rotated.height;
          canvas.aspectRatio = aspectRatio;
          canvas.naturalWidth = naturalWidth;
          canvas.naturalHeight = naturalHeight;

          // Computes rotated sizes with natural image sizes
          if (rotate % 180) {
            rotated = getRotatedSizes({
               naturalWidth,
              height: naturalHeight,
              degree: rotate
            });

            canvas.naturalWidth = rotated.width;
            canvas.naturalHeight = rotated.height;
          }

          this.limitCanvas(true, false);
        }
      }

      if (canvas.width > canvas.maxWidth || canvas.width < canvas.minWidth) {
        canvas.left = canvas.oldLeft;
      }

      if (canvas.height > canvas.maxHeight || canvas.height < canvas.minHeight) {
        canvas.top = canvas.oldTop;
      }

      canvas.width = min(max(canvas.width, canvas.minWidth), canvas.maxWidth);
      canvas.height = min(max(canvas.height, canvas.minHeight), canvas.maxHeight);

      this.limitCanvas(false, true);

      canvas.oldLeft = canvas.left = min(max(canvas.left, canvas.minLeft), canvas.maxLeft);
      canvas.oldTop = canvas.top = min(max(canvas.top, canvas.minTop), canvas.maxTop);

      this.$canvas.css({
         canvas.width,
        height: canvas.height,
        left: canvas.left,
        top: canvas.top
      });
//add by zhaoliang 20161224
      $("#drawing-board").css({
         canvas.width,
        height: canvas.height,
        left: canvas.left,
        top: canvas.top
      });
      $(".drawing-board-canvas").css({
         canvas.width,
        height: canvas.height
      });
//add end
      

      this.renderImage();

      if (this.isCropped && this.isLimited) {
        this.limitCropBox(true, true);
      }

      if (isChanged) {
        this.output();
      }
    },

    renderImage: function (isChanged) {
      var canvas = this.canvas;
      var image = this.image;
      var reversed;

      if (image.rotate) {
        reversed = getRotatedSizes({
           canvas.width,
          height: canvas.height,
          degree: image.rotate,
          aspectRatio: image.aspectRatio
        }, true);
      }

      $.extend(image, reversed ? {
         reversed.width,
        height: reversed.height,
        left: (canvas.width - reversed.width) / 2,
        top: (canvas.height - reversed.height) / 2
      } : {
         canvas.width,
        height: canvas.height,
        left: 0,
        top: 0
      });

      this.$clone.css({
         image.width,
        height: image.height,
        marginLeft: image.left,
        marginTop: image.top,
        transform: getTransform(image)
      });

      //图片旋转的时候，canvas也旋转
      $(".drawing-board-canvas").css({
         image.width,
        height: image.height,
        marginLeft: image.left,
        marginTop: image.top,
        transform: getTransform(image)
      });
      //end

      if (isChanged) {
        this.output();
      }
    },

    initCropBox: function () {
      var options = this.options;
      var canvas = this.canvas;
      var aspectRatio = options.aspectRatio;
      var autoCropArea = num(options.autoCropArea) || 0.8;
      var cropBox = {
             canvas.width,
            height: canvas.height
          };

      if (aspectRatio) {
        if (canvas.height * aspectRatio > canvas.width) {
          cropBox.height = cropBox.width / aspectRatio;
        } else {
          cropBox.width = cropBox.height * aspectRatio;
        }
      }

//add by zhaoliang 20161224
      canvas.top = 10;
      $("#drawing-board").css({
         canvas.width,
        height: canvas.height,
        left: canvas.left,
        top: canvas.top
      });
      $(".drawing-board-canvas").css({
         canvas.width,
        height: canvas.height
      });
      //$(".drawing-board-canvas").attr({
      //   canvas.width,
      //  height: canvas.height
      //});
//add end      
      this.cropBox = cropBox;
      this.limitCropBox(true, true);

      // Initialize auto crop area
      cropBox.width = min(max(cropBox.width, cropBox.minWidth), cropBox.maxWidth);
      cropBox.height = min(max(cropBox.height, cropBox.minHeight), cropBox.maxHeight);

      // The width of auto crop area must large than "minWidth", and the height too. (#164)
      cropBox.width = max(cropBox.minWidth, cropBox.width * autoCropArea);
      cropBox.height = max(cropBox.minHeight, cropBox.height * autoCropArea);
      cropBox.oldLeft = cropBox.left = canvas.left + (canvas.width - cropBox.width) / 2;
      cropBox.oldTop = cropBox.top = canvas.top + (canvas.height - cropBox.height) / 2;

      this.initialCropBox = $.extend({}, cropBox);
    },

    limitCropBox: function (isSizeLimited, isPositionLimited) {
      var options = this.options;
      var aspectRatio = options.aspectRatio;
      var container = this.container;
      var containerWidth = container.width;
      var containerHeight = container.height;
      var canvas = this.canvas;
      var cropBox = this.cropBox;
      var isLimited = this.isLimited;
      var minCropBoxWidth;
      var minCropBoxHeight;
      var maxCropBoxWidth;
      var maxCropBoxHeight;

      if (isSizeLimited) {
        minCropBoxWidth = num(options.minCropBoxWidth) || 0;
        minCropBoxHeight = num(options.minCropBoxHeight) || 0;

        // The min/maxCropBoxWidth/Height must be less than containerWidth/Height
        minCropBoxWidth = min(minCropBoxWidth, containerWidth);
        minCropBoxHeight = min(minCropBoxHeight, containerHeight);
        maxCropBoxWidth = min(containerWidth, isLimited ? canvas.width : containerWidth);
        maxCropBoxHeight = min(containerHeight, isLimited ? canvas.height : containerHeight);

        if (aspectRatio) {
          if (minCropBoxWidth && minCropBoxHeight) {
            if (minCropBoxHeight * aspectRatio > minCropBoxWidth) {
              minCropBoxHeight = minCropBoxWidth / aspectRatio;
            } else {
              minCropBoxWidth = minCropBoxHeight * aspectRatio;
            }
          } else if (minCropBoxWidth) {
            minCropBoxHeight = minCropBoxWidth / aspectRatio;
          } else if (minCropBoxHeight) {
            minCropBoxWidth = minCropBoxHeight * aspectRatio;
          }

          if (maxCropBoxHeight * aspectRatio > maxCropBoxWidth) {
            maxCropBoxHeight = maxCropBoxWidth / aspectRatio;
          } else {
            maxCropBoxWidth = maxCropBoxHeight * aspectRatio;
          }
        }

        // The minWidth/Height must be less than maxWidth/Height
        cropBox.minWidth = min(minCropBoxWidth, maxCropBoxWidth);
        cropBox.minHeight = min(minCropBoxHeight, maxCropBoxHeight);
        cropBox.maxWidth = maxCropBoxWidth;
        cropBox.maxHeight = maxCropBoxHeight;
      }

      if (isPositionLimited) {
        if (isLimited) {
          cropBox.minLeft = max(0, canvas.left);
          cropBox.minTop = max(0, canvas.top);
          cropBox.maxLeft = min(containerWidth, canvas.left + canvas.width) - cropBox.width;
          cropBox.maxTop = min(containerHeight, canvas.top + canvas.height) - cropBox.height;
        } else {
          cropBox.minLeft = 0;
          cropBox.minTop = 0;
          cropBox.maxLeft = containerWidth - cropBox.width;
          cropBox.maxTop = containerHeight - cropBox.height;
        }
      }
    },

    renderCropBox: function () {
      var options = this.options;
      var container = this.container;
      var containerWidth = container.width;
      var containerHeight = container.height;
      var cropBox = this.cropBox;

      if (cropBox.width > cropBox.maxWidth || cropBox.width < cropBox.minWidth) {
        cropBox.left = cropBox.oldLeft;
      }

      if (cropBox.height > cropBox.maxHeight || cropBox.height < cropBox.minHeight) {
        cropBox.top = cropBox.oldTop;
      }

      cropBox.width = min(max(cropBox.width, cropBox.minWidth), cropBox.maxWidth);
      cropBox.height = min(max(cropBox.height, cropBox.minHeight), cropBox.maxHeight);

      this.limitCropBox(false, true);

      cropBox.oldLeft = cropBox.left = min(max(cropBox.left, cropBox.minLeft), cropBox.maxLeft);
      cropBox.oldTop = cropBox.top = min(max(cropBox.top, cropBox.minTop), cropBox.maxTop);

      if (options.movable && options.cropBoxMovable) {

        // Turn to move the canvas when the crop box is equal to the container
        this.$face.data(DATA_ACTION, (cropBox.width === containerWidth && cropBox.height === containerHeight) ? ACTION_MOVE : ACTION_ALL);
      }

      this.$cropBox.css({
         cropBox.width,
        height: cropBox.height,
        left: cropBox.left,
        top: cropBox.top
      });

      if (this.isCropped && this.isLimited) {
        this.limitCanvas(true, true);
      }

      if (!this.isDisabled) {
        this.output();
      }
    },

    output: function () {
      this.preview();

      if (this.isCompleted) {
        this.trigger(EVENT_CROP, this.getData());
      }
    },

    initPreview: function () {
      var crossOrigin = getCrossOrigin(this.crossOrigin);
      var url = crossOrigin ? this.crossOriginUrl : this.url;
      var $clone2;

      this.$preview = $(this.options.preview);
      this.$clone2 = $clone2 = $('<img' + crossOrigin + ' src="' + url + '">');
      this.$viewBox.html($clone2);
      this.$preview.each(function () {
        var $this = $(this);

        // Save the original size for recover
        $this.data(DATA_PREVIEW, {
           $this.width(),
          height: $this.height(),
          html: $this.html()
        });

        /**
         * Override img element styles
         * Add `display:block` to avoid margin top issue
         * (Occur only when margin-top <= -height)
         */
        $this.html(
          '<img' + crossOrigin + ' src="' + url + '" style="' +
          'display:block;100%;height:auto;' +
          'min-0!important;min-height:0!important;' +
          'max-none!important;max-height:none!important;' +
          'image-orientation:0deg!important;">'
        );
      });
    },

    resetPreview: function () {
      this.$preview.each(function () {
        var $this = $(this);
        var data = $this.data(DATA_PREVIEW);

        $this.css({
           data.width,
          height: data.height
        }).html(data.html).removeData(DATA_PREVIEW);
      });
    },

    preview: function () {
      var image = this.image;
      var canvas = this.canvas;
      var cropBox = this.cropBox;
      var cropBoxWidth = cropBox.width;
      var cropBoxHeight = cropBox.height;
      var width = image.width;
      var height = image.height;
      var left = cropBox.left - canvas.left - image.left;
      var top = cropBox.top - canvas.top - image.top;

      if (!this.isCropped || this.isDisabled) {
        return;
      }

      this.$clone2.css({
         width,
        height: height,
        marginLeft: -left,
        marginTop: -top,
        transform: getTransform(image)
      });

      this.$preview.each(function () {
        var $this = $(this);
        var data = $this.data(DATA_PREVIEW);
        var originalWidth = data.width;
        var originalHeight = data.height;
        var newWidth = originalWidth;
        var newHeight = originalHeight;
        var ratio = 1;

        if (cropBoxWidth) {
          ratio = originalWidth / cropBoxWidth;
          newHeight = cropBoxHeight * ratio;
        }

        if (cropBoxHeight && newHeight > originalHeight) {
          ratio = originalHeight / cropBoxHeight;
          newWidth = cropBoxWidth * ratio;
          newHeight = originalHeight;
        }

        $this.css({
           newWidth,
          height: newHeight
        }).find('img').css({
           width * ratio,
          height: height * ratio,
          marginLeft: -left * ratio,
          marginTop: -top * ratio,
          transform: getTransform(image)
        });
      });
    },

    bind: function () {
      var options = this.options;
      var $this = this.$element;
      var $cropper = this.$cropper;

      if ($.isFunction(options.cropstart)) {
        $this.on(EVENT_CROP_START, options.cropstart);
      }

      if ($.isFunction(options.cropmove)) {
        $this.on(EVENT_CROP_MOVE, options.cropmove);
      }

      if ($.isFunction(options.cropend)) {
        $this.on(EVENT_CROP_END, options.cropend);
      }

      if ($.isFunction(options.crop)) {
        $this.on(EVENT_CROP, options.crop);
      }

      if ($.isFunction(options.zoom)) {
        $this.on(EVENT_ZOOM, options.zoom);
      }

      $cropper.on(EVENT_MOUSE_DOWN, $.proxy(this.cropStart, this));

      if (options.zoomable && options.zoomOnWheel) {
        $cropper.on(EVENT_WHEEL, $.proxy(this.wheel, this));
      }

      if (options.toggleDragModeOnDblclick) {
        $cropper.on(EVENT_DBLCLICK, $.proxy(this.dblclick, this));
      }

      $document.
        on(EVENT_MOUSE_MOVE, (this._cropMove = proxy(this.cropMove, this))).
        on(EVENT_MOUSE_UP, (this._cropEnd = proxy(this.cropEnd, this)));

      if (options.responsive) {
        $window.on(EVENT_RESIZE, (this._resize = proxy(this.resize, this)));
      }
    },

    unbind: function () {
      var options = this.options;
      var $this = this.$element;
      var $cropper = this.$cropper;

      if ($.isFunction(options.cropstart)) {
        $this.off(EVENT_CROP_START, options.cropstart);
      }

      if ($.isFunction(options.cropmove)) {
        $this.off(EVENT_CROP_MOVE, options.cropmove);
      }

      if ($.isFunction(options.cropend)) {
        $this.off(EVENT_CROP_END, options.cropend);
      }

      if ($.isFunction(options.crop)) {
        $this.off(EVENT_CROP, options.crop);
      }

      if ($.isFunction(options.zoom)) {
        $this.off(EVENT_ZOOM, options.zoom);
      }

      $cropper.off(EVENT_MOUSE_DOWN, this.cropStart);

      if (options.zoomable && options.zoomOnWheel) {
        $cropper.off(EVENT_WHEEL, this.wheel);
      }

      if (options.toggleDragModeOnDblclick) {
        $cropper.off(EVENT_DBLCLICK, this.dblclick);
      }

      $document.
        off(EVENT_MOUSE_MOVE, this._cropMove).
        off(EVENT_MOUSE_UP, this._cropEnd);

      if (options.responsive) {
        $window.off(EVENT_RESIZE, this._resize);
      }
    },

    resize: function () {
      var restore = this.options.restore;
      var $container = this.$container;
      var container = this.container;
      var canvasData;
      var cropBoxData;
      var ratio;

      // Check `container` is necessary for IE8
      if (this.isDisabled || !container) {
        return;
      }

      ratio = $container.width() / container.width;

      // Resize when width changed or height changed
      if (ratio !== 1 || $container.height() !== container.height) {
        if (restore) {
          canvasData = this.getCanvasData();
          cropBoxData = this.getCropBoxData();
        }

        this.render();

        if (restore) {
          this.setCanvasData($.each(canvasData, function (i, n) {
            canvasData[i] = n * ratio;
          }));
          this.setCropBoxData($.each(cropBoxData, function (i, n) {
            cropBoxData[i] = n * ratio;
          }));
        }
      }
    },

    dblclick: function () {
      if (this.isDisabled) {
        return;
      }

      if (this.$dragBox.hasClass(CLASS_CROP)) {
        this.setDragMode(ACTION_MOVE);
      } else {
        this.setDragMode(ACTION_CROP);
      }
    },

    wheel: function (event) {
      var e = event.originalEvent || event;
      var ratio = num(this.options.wheelZoomRatio) || 0.1;
      var delta = 1;

      if (this.isDisabled) {
        return;
      }

      event.preventDefault();

      // Limit wheel speed to prevent zoom too fast
      if (this.wheeling) {
        return;
      }

      this.wheeling = true;

      setTimeout($.proxy(function () {
        this.wheeling = false;
      }, this), 50);

      if (e.deltaY) {
        delta = e.deltaY > 0 ? 1 : -1;
      } else if (e.wheelDelta) {
        delta = -e.wheelDelta / 120;
      } else if (e.detail) {
        delta = e.detail > 0 ? 1 : -1;
      }

      this.zoom(-delta * ratio, event);
    },

    cropStart: function (event) {
      var options = this.options;
      var originalEvent = event.originalEvent;
      var touches = originalEvent && originalEvent.touches;
      var e = event;
      var touchesLength;
      var action;

      if (this.isDisabled) {
        return;
      }

      if (touches) {
        touchesLength = touches.length;

        if (touchesLength > 1) {
          if (options.zoomable && options.zoomOnTouch && touchesLength === 2) {
            e = touches[1];
            this.startX2 = e.pageX;
            this.startY2 = e.pageY;
            action = ACTION_ZOOM;
          } else {
            return;
          }
        }

        e = touches[0];
      }

      action = action || $(e.target).data(DATA_ACTION);

      if (REGEXP_ACTIONS.test(action)) {
        if (this.trigger(EVENT_CROP_START, {
          originalEvent: originalEvent,
          action: action
        }).isDefaultPrevented()) {
          return;
        }

        event.preventDefault();

        this.action = action;
        this.cropping = false;

        // IE8  has `event.pageX/Y`, but not `event.originalEvent.pageX/Y`
        // IE10 has `event.originalEvent.pageX/Y`, but not `event.pageX/Y`
        this.startX = e.pageX || originalEvent && originalEvent.pageX;
        this.startY = e.pageY || originalEvent && originalEvent.pageY;

        if (action === ACTION_CROP) {
          this.cropping = true;
          this.$dragBox.addClass(CLASS_MODAL);
        }
      }
    },

    cropMove: function (event) {
      var options = this.options;
      var originalEvent = event.originalEvent;
      var touches = originalEvent && originalEvent.touches;
      var e = event;
      var action = this.action;
      var touchesLength;

      if (this.isDisabled) {
        return;
      }

      if (touches) {
        touchesLength = touches.length;

        if (touchesLength > 1) {
          if (options.zoomable && options.zoomOnTouch && touchesLength === 2) {
            e = touches[1];
            this.endX2 = e.pageX;
            this.endY2 = e.pageY;
          } else {
            return;
          }
        }

        e = touches[0];
      }

      if (action) {
        if (this.trigger(EVENT_CROP_MOVE, {
          originalEvent: originalEvent,
          action: action
        }).isDefaultPrevented()) {
          return;
        }

        event.preventDefault();

        this.endX = e.pageX || originalEvent && originalEvent.pageX;
        this.endY = e.pageY || originalEvent && originalEvent.pageY;

        this.change(e.shiftKey, action === ACTION_ZOOM ? event : null);
      }
    },

    cropEnd: function (event) {
      var originalEvent = event.originalEvent;
      var action = this.action;

      if (this.isDisabled) {
        return;
      }

      if (action) {
        event.preventDefault();

        if (this.cropping) {
          this.cropping = false;
          this.$dragBox.toggleClass(CLASS_MODAL, this.isCropped && this.options.modal);
        }

        this.action = '';

        this.trigger(EVENT_CROP_END, {
          originalEvent: originalEvent,
          action: action
        });
      }
    },

    change: function (shiftKey, event) {
      var options = this.options;
      var aspectRatio = options.aspectRatio;
      var action = this.action;
      var container = this.container;
      var canvas = this.canvas;
      var cropBox = this.cropBox;
      var width = cropBox.width;
      var height = cropBox.height;
      var left = cropBox.left;
      var top = cropBox.top;
      var right = left + width;
      var bottom = top + height;
      var minLeft = 0;
      var minTop = 0;
      var maxWidth = container.width;
      var maxHeight = container.height;
      var renderable = true;
      var offset;
      var range;

      // Locking aspect ratio in "free mode" by holding shift key (#259)
      if (!aspectRatio && shiftKey) {
        aspectRatio = width && height ? width / height : 1;
      }

      if (this.isLimited) {
        minLeft = cropBox.minLeft;
        minTop = cropBox.minTop;
        maxWidth = minLeft + min(container.width, canvas.width, canvas.left + canvas.width);
        maxHeight = minTop + min(container.height, canvas.height, canvas.top + canvas.height);
      }

      range = {
        x: this.endX - this.startX,
        y: this.endY - this.startY
      };

      if (aspectRatio) {
        range.X = range.y * aspectRatio;
        range.Y = range.x / aspectRatio;
      }

      switch (action) {
        // Move crop box
        case ACTION_ALL:
          left += range.x;
          top += range.y;
          break;

        // Resize crop box
        case ACTION_EAST:
          if (range.x >= 0 && (right >= maxWidth || aspectRatio &&
            (top <= minTop || bottom >= maxHeight))) {

            renderable = false;
            break;
          }

          width += range.x;

          if (aspectRatio) {
            height = width / aspectRatio;
            top -= range.Y / 2;
          }

          if (width < 0) {
            action = ACTION_WEST;
            width = 0;
          }

          break;

        case ACTION_NORTH:
          if (range.y <= 0 && (top <= minTop || aspectRatio &&
            (left <= minLeft || right >= maxWidth))) {

            renderable = false;
            break;
          }

          height -= range.y;
          top += range.y;

          if (aspectRatio) {
            width = height * aspectRatio;
            left += range.X / 2;
          }

          if (height < 0) {
            action = ACTION_SOUTH;
            height = 0;
          }

          break;

        case ACTION_WEST:
          if (range.x <= 0 && (left <= minLeft || aspectRatio &&
            (top <= minTop || bottom >= maxHeight))) {

            renderable = false;
            break;
          }

          width -= range.x;
          left += range.x;

          if (aspectRatio) {
            height = width / aspectRatio;
            top += range.Y / 2;
          }

          if (width < 0) {
            action = ACTION_EAST;
            width = 0;
          }

          break;

        case ACTION_SOUTH:
          if (range.y >= 0 && (bottom >= maxHeight || aspectRatio &&
            (left <= minLeft || right >= maxWidth))) {

            renderable = false;
            break;
          }

          height += range.y;

          if (aspectRatio) {
            width = height * aspectRatio;
            left -= range.X / 2;
          }

          if (height < 0) {
            action = ACTION_NORTH;
            height = 0;
          }

          break;

        case ACTION_NORTH_EAST:
          if (aspectRatio) {
            if (range.y <= 0 && (top <= minTop || right >= maxWidth)) {
              renderable = false;
              break;
            }

            height -= range.y;
            top += range.y;
            width = height * aspectRatio;
          } else {
            if (range.x >= 0) {
              if (right < maxWidth) {
                width += range.x;
              } else if (range.y <= 0 && top <= minTop) {
                renderable = false;
              }
            } else {
              width += range.x;
            }

            if (range.y <= 0) {
              if (top > minTop) {
                height -= range.y;
                top += range.y;
              }
            } else {
              height -= range.y;
              top += range.y;
            }
          }

          if (width < 0 && height < 0) {
            action = ACTION_SOUTH_WEST;
            height = 0;
            width = 0;
          } else if (width < 0) {
            action = ACTION_NORTH_WEST;
            width = 0;
          } else if (height < 0) {
            action = ACTION_SOUTH_EAST;
            height = 0;
          }

          break;

        case ACTION_NORTH_WEST:
          if (aspectRatio) {
            if (range.y <= 0 && (top <= minTop || left <= minLeft)) {
              renderable = false;
              break;
            }

            height -= range.y;
            top += range.y;
            width = height * aspectRatio;
            left += range.X;
          } else {
            if (range.x <= 0) {
              if (left > minLeft) {
                width -= range.x;
                left += range.x;
              } else if (range.y <= 0 && top <= minTop) {
                renderable = false;
              }
            } else {
              width -= range.x;
              left += range.x;
            }

            if (range.y <= 0) {
              if (top > minTop) {
                height -= range.y;
                top += range.y;
              }
            } else {
              height -= range.y;
              top += range.y;
            }
          }

          if (width < 0 && height < 0) {
            action = ACTION_SOUTH_EAST;
            height = 0;
            width = 0;
          } else if (width < 0) {
            action = ACTION_NORTH_EAST;
            width = 0;
          } else if (height < 0) {
            action = ACTION_SOUTH_WEST;
            height = 0;
          }

          break;

        case ACTION_SOUTH_WEST:
          if (aspectRatio) {
            if (range.x <= 0 && (left <= minLeft || bottom >= maxHeight)) {
              renderable = false;
              break;
            }

            width -= range.x;
            left += range.x;
            height = width / aspectRatio;
          } else {
            if (range.x <= 0) {
              if (left > minLeft) {
                width -= range.x;
                left += range.x;
              } else if (range.y >= 0 && bottom >= maxHeight) {
                renderable = false;
              }
            } else {
              width -= range.x;
              left += range.x;
            }

            if (range.y >= 0) {
              if (bottom < maxHeight) {
                height += range.y;
              }
            } else {
              height += range.y;
            }
          }

          if (width < 0 && height < 0) {
            action = ACTION_NORTH_EAST;
            height = 0;
            width = 0;
          } else if (width < 0) {
            action = ACTION_SOUTH_EAST;
            width = 0;
          } else if (height < 0) {
            action = ACTION_NORTH_WEST;
            height = 0;
          }

          break;

        case ACTION_SOUTH_EAST:
          if (aspectRatio) {
            if (range.x >= 0 && (right >= maxWidth || bottom >= maxHeight)) {
              renderable = false;
              break;
            }

            width += range.x;
            height = width / aspectRatio;
          } else {
            if (range.x >= 0) {
              if (right < maxWidth) {
                width += range.x;
              } else if (range.y >= 0 && bottom >= maxHeight) {
                renderable = false;
              }
            } else {
              width += range.x;
            }

            if (range.y >= 0) {
              if (bottom < maxHeight) {
                height += range.y;
              }
            } else {
              height += range.y;
            }
          }

          if (width < 0 && height < 0) {
            action = ACTION_NORTH_WEST;
            height = 0;
            width = 0;
          } else if (width < 0) {
            action = ACTION_SOUTH_WEST;
            width = 0;
          } else if (height < 0) {
            action = ACTION_NORTH_EAST;
            height = 0;
          }

          break;

        // Move canvas
        case ACTION_MOVE:
          this.move(range.x, range.y);
          renderable = false;
          break;

        // Zoom canvas
        case ACTION_ZOOM:
          this.zoom((function (x1, y1, x2, y2) {
            var z1 = sqrt(x1 * x1 + y1 * y1);
            var z2 = sqrt(x2 * x2 + y2 * y2);

            return (z2 - z1) / z1;
          })(
            abs(this.startX - this.startX2),
            abs(this.startY - this.startY2),
            abs(this.endX - this.endX2),
            abs(this.endY - this.endY2)
          ), event);
          this.startX2 = this.endX2;
          this.startY2 = this.endY2;
          renderable = false;
          break;

        // Create crop box
        case ACTION_CROP:
          if (!range.x || !range.y) {
            renderable = false;
            break;
          }

          offset = this.$cropper.offset();
          left = this.startX - offset.left;
          top = this.startY - offset.top;
          width = cropBox.minWidth;
          height = cropBox.minHeight;

          if (range.x > 0) {
            action = range.y > 0 ? ACTION_SOUTH_EAST : ACTION_NORTH_EAST;
          } else if (range.x < 0) {
            left -= width;
            action = range.y > 0 ? ACTION_SOUTH_WEST : ACTION_NORTH_WEST;
          }

          if (range.y < 0) {
            top -= height;
          }

          // Show the crop box if is hidden
          if (!this.isCropped) {
            this.$cropBox.removeClass(CLASS_HIDDEN);
            this.isCropped = true;

            if (this.isLimited) {
              this.limitCropBox(true, true);
            }
          }

          break;

        // No default
      }

      if (renderable) {
        cropBox.width = width;
        cropBox.height = height;
        cropBox.left = left;
        cropBox.top = top;
        this.action = action;

        this.renderCropBox();
      }

      // Override
      this.startX = this.endX;
      this.startY = this.endY;
    },

    // Show the crop box manually
    crop: function () {
      if (!this.isBuilt || this.isDisabled) {
        return;
      }

      if (!this.isCropped) {
        this.isCropped = true;
        this.limitCropBox(true, true);

        if (this.options.modal) {
          this.$dragBox.addClass(CLASS_MODAL);
        }

        this.$cropBox.removeClass(CLASS_HIDDEN);
      }

      this.setCropBoxData(this.initialCropBox);
    },

    // Reset the image and crop box to their initial states
    reset: function () {
      if (!this.isBuilt || this.isDisabled) {
        return;
      }

      this.image = $.extend({}, this.initialImage);
      this.canvas = $.extend({}, this.initialCanvas);
      this.cropBox = $.extend({}, this.initialCropBox);

      this.renderCanvas();

      if (this.isCropped) {
        this.renderCropBox();
      }
    },

    // Clear the crop box
    clear: function () {
      if (!this.isCropped || this.isDisabled) {
        return;
      }

      $.extend(this.cropBox, {
        left: 0,
        top: 0,
         0,
        height: 0
      });

      this.isCropped = false;
      this.renderCropBox();

      this.limitCanvas(true, true);

      // Render canvas after crop box rendered
      this.renderCanvas();

      this.$dragBox.removeClass(CLASS_MODAL);
      this.$cropBox.addClass(CLASS_HIDDEN);
    },

    /**
     * Replace the image's src and rebuild the cropper
     *
     * @param {String} url
     * @param {Boolean} onlyColorChanged (optional)
     */
    replace: function (url, onlyColorChanged) {
      if (!this.isDisabled && url) {
        if (this.isImg) {
          this.$element.attr('src', url);
        }

        if (onlyColorChanged) {
          this.url = url;
          this.$clone.attr('src', url);

          if (this.isBuilt) {
            this.$preview.find('img').add(this.$clone2).attr('src', url);
          }
        } else {
          if (this.isImg) {
            this.isReplaced = true;
          }

          // Clear previous data
          this.options.data = null;
          this.load(url);
        }
      }
    },

    // Enable (unfreeze) the cropper
    enable: function () {
      if (this.isBuilt) {
        this.isDisabled = false;
        this.$cropper.removeClass(CLASS_DISABLED);
      }
    },

    // Disable (freeze) the cropper
    disable: function () {
      if (this.isBuilt) {
        this.isDisabled = true;
        this.$cropper.addClass(CLASS_DISABLED);
      }
    },

    // Destroy the cropper and remove the instance from the image
    destroy: function () {
      var $this = this.$element;

      if (this.isLoaded) {
        if (this.isImg && this.isReplaced) {
          $this.attr('src', this.originalUrl);
        }

        this.unbuild();
        $this.removeClass(CLASS_HIDDEN);
      } else {
        if (this.isImg) {
          $this.off(EVENT_LOAD, this.start);
        } else if (this.$clone) {
          this.$clone.remove();
        }
      }

      $this.removeData(NAMESPACE);
    },

    /**
     * Move the canvas with relative offsets
     *
     * @param {Number} offsetX
     * @param {Number} offsetY (optional)
     */
    move: function (offsetX, offsetY) {
      var canvas = this.canvas;

      this.moveTo(
        isUndefined(offsetX) ? offsetX : canvas.left + num(offsetX),
        isUndefined(offsetY) ? offsetY : canvas.top + num(offsetY)
      );
    },

    /**
     * Move the canvas to an absolute point
     *
     * @param {Number} x
     * @param {Number} y (optional)
     */
    moveTo: function (x, y) {
      var canvas = this.canvas;
      var isChanged = false;

      // If "y" is not present, its default value is "x"
      if (isUndefined(y)) {
        y = x;
      }

      x = num(x);
      y = num(y);

      if (this.isBuilt && !this.isDisabled && this.options.movable) {
        if (isNumber(x)) {
          canvas.left = x;
          isChanged = true;
        }

        if (isNumber(y)) {
          canvas.top = y;
          isChanged = true;
        }

        if (isChanged) {
          this.renderCanvas(true);
        }
      }
    },

    /**
     * Zoom the canvas with a relative ratio
     *
     * @param {Number} ratio
     * @param {jQuery Event} _event (private)
     */
    zoom: function (ratio, _event) {
      var canvas = this.canvas;

      ratio = num(ratio);

      if (ratio < 0) {
        ratio =  1 / (1 - ratio);
      } else {
        ratio = 1 + ratio;
      }

      this.zoomTo(canvas.width * ratio / canvas.naturalWidth, _event);
    },

    /**
     * Zoom the canvas to an absolute ratio
     *
     * @param {Number} ratio
     * @param {jQuery Event} _event (private)
     */
    zoomTo: function (ratio, _event) {
      var options = this.options;
      var canvas = this.canvas;
      var width = canvas.width;
      var height = canvas.height;
      var naturalWidth = canvas.naturalWidth;
      var naturalHeight = canvas.naturalHeight;
      var originalEvent;
      var newWidth;
      var newHeight;
      var offset;
      var center;

      ratio = num(ratio);

      if (ratio >= 0 && this.isBuilt && !this.isDisabled && options.zoomable) {
        newWidth = naturalWidth * ratio;
        newHeight = naturalHeight * ratio;

        if (_event) {
          originalEvent = _event.originalEvent;
        }

        if (this.trigger(EVENT_ZOOM, {
          originalEvent: originalEvent,
          oldRatio: width / naturalWidth,
          ratio: newWidth / naturalWidth
        }).isDefaultPrevented()) {
          return;
        }

        if (originalEvent) {
          offset = this.$cropper.offset();
          center = originalEvent.touches ? getTouchesCenter(originalEvent.touches) : {
            pageX: _event.pageX || originalEvent.pageX || 0,
            pageY: _event.pageY || originalEvent.pageY || 0
          };

          // Zoom from the triggering point of the event
          canvas.left -= (newWidth - width) * (
            ((center.pageX - offset.left) - canvas.left) / width
          );
          canvas.top -= (newHeight - height) * (
            ((center.pageY - offset.top) - canvas.top) / height
          );
        } else {

          // Zoom from the center of the canvas
          canvas.left -= (newWidth - width) / 2;
          canvas.top -= (newHeight - height) / 2;
        }

        canvas.width = newWidth;
        canvas.height = newHeight;
        this.renderCanvas(true);
      }
    },

    /**
     * Rotate the canvas with a relative degree
     *
     * @param {Number} degree
     */
    rotate: function (degree) {
      this.rotateTo((this.image.rotate || 0) + num(degree));
    },

    /**
     * Rotate the canvas to an absolute degree
     * https://developer.mozilla.org/en-US/docs/Web/CSS/transform-function#rotate()
     *
     * @param {Number} degree
     */
    rotateTo: function (degree) {
      degree = num(degree);

      if (isNumber(degree) && this.isBuilt && !this.isDisabled && this.options.rotatable) {
        this.image.rotate = degree % 360;
        this.isRotated = true;
        this.renderCanvas(true);
      }
    },

    /**
     * Scale the image
     * https://developer.mozilla.org/en-US/docs/Web/CSS/transform-function#scale()
     *
     * @param {Number} scaleX
     * @param {Number} scaleY (optional)
     */
    scale: function (scaleX, scaleY) {
      var image = this.image;
      var isChanged = false;

      // If "scaleY" is not present, its default value is "scaleX"
      if (isUndefined(scaleY)) {
        scaleY = scaleX;
      }

      scaleX = num(scaleX);
      scaleY = num(scaleY);

      if (this.isBuilt && !this.isDisabled && this.options.scalable) {
        if (isNumber(scaleX)) {
          image.scaleX = scaleX;
          isChanged = true;
        }

        if (isNumber(scaleY)) {
          image.scaleY = scaleY;
          isChanged = true;
        }

        if (isChanged) {
          this.renderImage(true);
        }
      }
    },

    /**
     * Scale the abscissa of the image
     *
     * @param {Number} scaleX
     */
    scaleX: function (scaleX) {
      var scaleY = this.image.scaleY;

      this.scale(scaleX, isNumber(scaleY) ? scaleY : 1);
    },

    /**
     * Scale the ordinate of the image
     *
     * @param {Number} scaleY
     */
    scaleY: function (scaleY) {
      var scaleX = this.image.scaleX;

      this.scale(isNumber(scaleX) ? scaleX : 1, scaleY);
    },

    /**
     * Get the cropped area position and size data (base on the original image)
     *
     * @param {Boolean} isRounded (optional)
     * @return {Object} data
     */
    getData: function (isRounded) {
      var options = this.options;
      var image = this.image;
      var canvas = this.canvas;
      var cropBox = this.cropBox;
      var ratio;
      var data;

      if (this.isBuilt && this.isCropped) {
        data = {
          x: cropBox.left - canvas.left,
          y: cropBox.top - canvas.top,
           cropBox.width,
          height: cropBox.height
        };

        ratio = image.width / image.naturalWidth;

        $.each(data, function (i, n) {
          n = n / ratio;
          data[i] = isRounded ? round(n) : n;
        });

      } else {
        data = {
          x: 0,
          y: 0,
           0,
          height: 0
        };
      }

      if (options.rotatable) {
        data.rotate = image.rotate || 0;
      }

      if (options.scalable) {
        data.scaleX = image.scaleX || 1;
        data.scaleY = image.scaleY || 1;
      }

      return data;
    },

    /**
     * Set the cropped area position and size with new data
     *
     * @param {Object} data
     */
    setData: function (data) {
      var options = this.options;
      var image = this.image;
      var canvas = this.canvas;
      var cropBoxData = {};
      var isRotated;
      var isScaled;
      var ratio;

      if ($.isFunction(data)) {
        data = data.call(this.element);
      }

      if (this.isBuilt && !this.isDisabled && $.isPlainObject(data)) {
        if (options.rotatable) {
          if (isNumber(data.rotate) && data.rotate !== image.rotate) {
            image.rotate = data.rotate;
            this.isRotated = isRotated = true;
          }
        }

        if (options.scalable) {
          if (isNumber(data.scaleX) && data.scaleX !== image.scaleX) {
            image.scaleX = data.scaleX;
            isScaled = true;
          }

          if (isNumber(data.scaleY) && data.scaleY !== image.scaleY) {
            image.scaleY = data.scaleY;
            isScaled = true;
          }
        }

        if (isRotated) {
          this.renderCanvas();
        } else if (isScaled) {
          this.renderImage();
        }

        ratio = image.width / image.naturalWidth;

        if (isNumber(data.x)) {
          cropBoxData.left = data.x * ratio + canvas.left;
        }

        if (isNumber(data.y)) {
          cropBoxData.top = data.y * ratio + canvas.top;
        }

        if (isNumber(data.width)) {
          cropBoxData.width = data.width * ratio;
        }

        if (isNumber(data.height)) {
          cropBoxData.height = data.height * ratio;
        }

        this.setCropBoxData(cropBoxData);
      }
    },

    /**
     * Get the container size data
     *
     * @return {Object} data
     */
    getContainerData: function () {
      return this.isBuilt ? this.container : {};
    },

    /**
     * Get the image position and size data
     *
     * @return {Object} data
     */
    getImageData: function () {
      return this.isLoaded ? this.image : {};
    },

    /**
     * Get the canvas position and size data
     *
     * @return {Object} data
     */
    getCanvasData: function () {
      var canvas = this.canvas;
      var data = {};

      if (this.isBuilt) {
        $.each([
          'left',
          'top',
          'width',
          'height',
          'naturalWidth',
          'naturalHeight'
        ], function (i, n) {
          data[n] = canvas[n];
        });
      }

      return data;
    },

    /**
     * Set the canvas position and size with new data
     *
     * @param {Object} data
     */
    setCanvasData: function (data) {
      var canvas = this.canvas;
      var aspectRatio = canvas.aspectRatio;

      if ($.isFunction(data)) {
        data = data.call(this.$element);
      }

      if (this.isBuilt && !this.isDisabled && $.isPlainObject(data)) {
        if (isNumber(data.left)) {
          canvas.left = data.left;
        }

        if (isNumber(data.top)) {
          canvas.top = data.top;
        }

        if (isNumber(data.width)) {
          canvas.width = data.width;
          canvas.height = data.width / aspectRatio;
        } else if (isNumber(data.height)) {
          canvas.height = data.height;
          canvas.width = data.height * aspectRatio;
        }

        this.renderCanvas(true);
      }
    },

    /**
     * Get the crop box position and size data
     *
     * @return {Object} data
     */
    getCropBoxData: function () {
      var cropBox = this.cropBox;
      var data;

      if (this.isBuilt && this.isCropped) {
        data = {
          left: cropBox.left,
          top: cropBox.top,
           cropBox.width,
          height: cropBox.height
        };
      }

      return data || {};
    },

    /**
     * Set the crop box position and size with new data
     *
     * @param {Object} data
     */
    setCropBoxData: function (data) {
      var cropBox = this.cropBox;
      var aspectRatio = this.options.aspectRatio;
      var isWidthChanged;
      var isHeightChanged;

      if ($.isFunction(data)) {
        data = data.call(this.$element);
      }

      if (this.isBuilt && this.isCropped && !this.isDisabled && $.isPlainObject(data)) {

        if (isNumber(data.left)) {
          cropBox.left = data.left;
        }

        if (isNumber(data.top)) {
          cropBox.top = data.top;
        }

        if (isNumber(data.width)) {
          isWidthChanged = true;
          cropBox.width = data.width;
        }

        if (isNumber(data.height)) {
          isHeightChanged = true;
          cropBox.height = data.height;
        }

        if (aspectRatio) {
          if (isWidthChanged) {
            cropBox.height = cropBox.width / aspectRatio;
          } else if (isHeightChanged) {
            cropBox.width = cropBox.height * aspectRatio;
          }
        }

        this.renderCropBox();
      }
    },

    /**
     * Get a canvas drawn the cropped image
     *
     * @param {Object} options (optional)
     * @return {HTMLCanvasElement} canvas
     */
    getCroppedCanvas: function (options) {
      var originalWidth;
      var originalHeight;
      var canvasWidth;
      var canvasHeight;
      var scaledWidth;
      var scaledHeight;
      var scaledRatio;
      var aspectRatio;
      var canvas;
      var context;
      var data;

      if (!this.isBuilt || !SUPPORT_CANVAS) {
        return;
      }

      if (!this.isCropped) {
        return getSourceCanvas(this.$clone[0], this.image);
      }

      if (!$.isPlainObject(options)) {
        options = {};
      }

      data = this.getData();
      originalWidth = data.width;
      originalHeight = data.height;
      aspectRatio = originalWidth / originalHeight;

      if ($.isPlainObject(options)) {
        scaledWidth = options.width;
        scaledHeight = options.height;

        if (scaledWidth) {
          scaledHeight = scaledWidth / aspectRatio;
          scaledRatio = scaledWidth / originalWidth;
        } else if (scaledHeight) {
          scaledWidth = scaledHeight * aspectRatio;
          scaledRatio = scaledHeight / originalHeight;
        }
      }

      // The canvas element will use `Math.floor` on a float number, so floor first
      canvasWidth = floor(scaledWidth || originalWidth);
      canvasHeight = floor(scaledHeight || originalHeight);

      canvas = $('<canvas>')[0];
      canvas.width = canvasWidth;
      canvas.height = canvasHeight;
      context = canvas.getContext('2d');

      if (options.fillColor) {
        context.fillStyle = options.fillColor;
        context.fillRect(0, 0, canvasWidth, canvasHeight);
      }

      // https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D.drawImage
      context.drawImage.apply(context, (function () {
        var source = getSourceCanvas(this.$clone[0], this.image);
        var sourceWidth = source.width;
        var sourceHeight = source.height;
        var canvas = this.canvas;
        var params = [source];

        // Source canvas
        var srcX = data.x + canvas.naturalWidth * (abs(data.scaleX || 1) - 1) / 2;
        var srcY = data.y + canvas.naturalHeight * (abs(data.scaleY || 1) - 1) / 2;
        var srcWidth;
        var srcHeight;

        // Destination canvas
        var dstX;
        var dstY;
        var dstWidth;
        var dstHeight;

        if (srcX <= -originalWidth || srcX > sourceWidth) {
          srcX = srcWidth = dstX = dstWidth = 0;
        } else if (srcX <= 0) {
          dstX = -srcX;
          srcX = 0;
          srcWidth = dstWidth = min(sourceWidth, originalWidth + srcX);
        } else if (srcX <= sourceWidth) {
          dstX = 0;
          srcWidth = dstWidth = min(originalWidth, sourceWidth - srcX);
        }

        if (srcWidth <= 0 || srcY <= -originalHeight || srcY > sourceHeight) {
          srcY = srcHeight = dstY = dstHeight = 0;
        } else if (srcY <= 0) {
          dstY = -srcY;
          srcY = 0;
          srcHeight = dstHeight = min(sourceHeight, originalHeight + srcY);
        } else if (srcY <= sourceHeight) {
          dstY = 0;
          srcHeight = dstHeight = min(originalHeight, sourceHeight - srcY);
        }

        // All the numerical parameters should be integer for `drawImage` (#476)
        params.push(floor(srcX), floor(srcY), floor(srcWidth), floor(srcHeight));

        // Scale destination sizes
        if (scaledRatio) {
          dstX *= scaledRatio;
          dstY *= scaledRatio;
          dstWidth *= scaledRatio;
          dstHeight *= scaledRatio;
        }

        // Avoid "IndexSizeError" in IE and Firefox
        if (dstWidth > 0 && dstHeight > 0) {
          params.push(floor(dstX), floor(dstY), floor(dstWidth), floor(dstHeight));
        }

        return params;
      }).call(this));

      return canvas;
    },

    /**
     * Change the aspect ratio of the crop box
     *
     * @param {Number} aspectRatio
     */
    setAspectRatio: function (aspectRatio) {
      var options = this.options;

      if (!this.isDisabled && !isUndefined(aspectRatio)) {

        // 0 -> NaN
        options.aspectRatio = max(0, aspectRatio) || NaN;

        if (this.isBuilt) {
          this.initCropBox();

          if (this.isCropped) {
            this.renderCropBox();
          }
        }
      }
    },

    /**
     * Change the drag mode
     *
     * @param {String} mode (optional)
     */
    setDragMode: function (mode) {
      var options = this.options;
      var croppable;
      var movable;

      if (this.isLoaded && !this.isDisabled) {
        croppable = mode === ACTION_CROP;
        movable = options.movable && mode === ACTION_MOVE;
        mode = (croppable || movable) ? mode : ACTION_NONE;

        this.$dragBox.
          data(DATA_ACTION, mode).
          toggleClass(CLASS_CROP, croppable).
          toggleClass(CLASS_MOVE, movable);

        if (!options.cropBoxMovable) {

          // Sync drag mode to crop box when it is not movable(#300)
          this.$face.
            data(DATA_ACTION, mode).
            toggleClass(CLASS_CROP, croppable).
            toggleClass(CLASS_MOVE, movable);
        }
      }
    }
  };

  Cropper.DEFAULTS = {

    // Define the view mode of the cropper
    viewMode: 0, // 0, 1, 2, 3

    // Define the dragging mode of the cropper
    dragMode: 'crop', // 'crop', 'move' or 'none'

    // Define the aspect ratio of the crop box
    aspectRatio: NaN,

    // An object with the previous cropping result data
    data: null,

    // A jQuery selector for adding extra containers to preview
    preview: '',

    // Re-render the cropper when resize the window
    responsive: true,

    // Restore the cropped area after resize the window
    restore: true,

    // Check if the current image is a cross-origin image
    checkCrossOrigin: true,

    // Check the current image's Exif Orientation information
    checkOrientation: true,

    // Show the black modal
    modal: true,

    // Show the dashed lines for guiding
    guides: true,

    // Show the center indicator for guiding
    center: true,

    // Show the white modal to highlight the crop box
    highlight: true,

    // Show the grid background
    background: true,

    // Enable to crop the image automatically when initialize
    autoCrop: true,

    // Define the percentage of automatic cropping area when initializes
    autoCropArea: 0.8,

    // Enable to move the image
    movable: true,

    // Enable to rotate the image
    rotatable: true,

    // Enable to scale the image
    scalable: true,

    // Enable to zoom the image
    zoomable: true,

    // Enable to zoom the image by dragging touch
    zoomOnTouch: true,

    // Enable to zoom the image by wheeling mouse
    zoomOnWheel: true,

    // Define zoom ratio when zoom the image by wheeling mouse
    wheelZoomRatio: 0.1,

    // Enable to move the crop box
    cropBoxMovable: true,

    // Enable to resize the crop box
    cropBoxResizable: true,

    // Toggle drag mode between "crop" and "move" when click twice on the cropper
    toggleDragModeOnDblclick: true,

    // Size limitation
    minCanvasWidth: 0,
    minCanvasHeight: 0,
    minCropBoxWidth: 0,
    minCropBoxHeight: 0,
    minContainerWidth: 200,
    minContainerHeight: 100,

    // Shortcuts of events
    build: null,
    built: null,
    cropstart: null,
    cropmove: null,
    cropend: null,
    crop: null,
    zoom: null
  };

  Cropper.setDefaults = function (options) {
    $.extend(Cropper.DEFAULTS, options);
  };

  Cropper.TEMPLATE = (
    '<div class="cropper-container">' +
      '<div class="cropper-wrap-box">' +
        '<div class="cropper-canvas"></div>' +
      '</div>' +
      '<div class="cropper-drag-box"></div>' +

    '</div>'
  );

  // Save the other cropper
  Cropper.other = $.fn.cropper;

  // Register as jQuery plugin
  $.fn.cropper = function (option) {
    var args = toArray(arguments, 1);
    var result;

    this.each(function () {
      var $this = $(this);
      var data = $this.data(NAMESPACE);
      var options;
      var fn;

      if (!data) {
        if (/destroy/.test(option)) {
          return;
        }

        options = $.extend({}, $this.data(), $.isPlainObject(option) && option);
        $this.data(NAMESPACE, (data = new Cropper(this, options)));
      }

      if (typeof option === 'string' && $.isFunction(fn = data[option])) {
        result = fn.apply(data, args);
      }
    });

    return isUndefined(result) ? this : result;
  };

  $.fn.cropper.Constructor = Cropper;
  $.fn.cropper.setDefaults = Cropper.setDefaults;

  // No conflict
  $.fn.cropper.noConflict = function () {
    $.fn.cropper = Cropper.other;
    return this;
  };

});

完成。