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

HTML5 canvas处理图片的各种效果，包括放大缩小涂鸦等

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

HTML5 canvas处理图片的各种效果，包括放大缩小涂鸦等

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

图片放大缩小拖放

HTML5 canvas处理图片的各种效果，包括放大缩小涂鸦等

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 {
      width: 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({
        width: 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);

      $cropper.css((this.container = {
        width: max($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,
        width: 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({
          width: 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({
              width: 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({
        width: canvas.width,
        height: canvas.height,
        left: canvas.left,
        top: canvas.top
      });
//add by zhaoliang 20161224
      $("#drawing-board").css({
        width: canvas.width,
        height: canvas.height,
        left: canvas.left,
        top: canvas.top
      });
      $(".drawing-board-canvas").css({
        width: 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({
          width: canvas.width,
          height: canvas.height,
          degree: image.rotate,
          aspectRatio: image.aspectRatio
        }, true);
      }

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

this.$clone.css({
        width: 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({
        width: 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 = {
            width: 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({
        width: canvas.width,
        height: canvas.height,
        left: canvas.left,
        top: canvas.top
      });
      $(".drawing-board-canvas").css({
        width: canvas.width,
        height: canvas.height
      });
//$(".drawing-board-canvas").attr({
//  width: 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({
        width: 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, {
          width: $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;width:100%;height:auto;' +
          'min-width:0!important;min-height:0!important;' +
          'max-width: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({
          width: 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: 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({
          width: newWidth,
          height: newHeight
        }).find('img').css({
          width: 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,
        width: 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,
          width: 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,
          width: 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,
          width: 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;
  };

});

View Code

完成。

秒客网

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