基于layui+cropper.js实现上传图片的裁剪功能的方法
内容导读
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内容图文
前端的裁剪我知道的可以分为这么两种：flash一种，canvas一种。现在用的多的是canvas这种。
其实裁剪最本质的原理：通过工具获取到图片（不是JS那种获取DOM的方式，比如flash获取到图片，对图片任意操作，canvas也是一样，将图片放在画布上，任意操作）
本文使用的是canvas这种方式，借助的是cropper.js实现图片的裁剪。
由于前端页面使用的是layui这个框架，所有使用cropper时，最好的能够将cropper这个包作为一个layui的扩展嵌入到layui中，这样都省事，嵌入很简单，具体可以参考下面我封装好的代码
备注：cropper默认裁剪后的图片格式为png格式，如果需要自定义上传图片的格式，可以参考下面这段代码，如果不需要请直接忽略
cropper修改上传图片的格式：
var cas=imageEle.cropper('getCroppedCanvas');
var base64url=cas.toDataURL('image/jpeg');
console.log(base64url); //生成base64图片的格式
// 展示裁剪的图片的两种方式
// 方式一
$('.cavans').html(cas) //在body显示出canvas元素
// 方式二
$('.canvans').attr("src", base64url);封装好的cropper源码如下，包括cropper-jQuery的
具体代码：
cropper-css
/*!
* Cropper.js v1.4.3
* https://fengyuanchen.github.io/cropperjs
*
* Copyright 2015-present Chen Fengyuan
* Released under the MIT license
*
* Date: 2018-10-24T13:07:11.429Z
*/
.cropper-container {
direction: ltr;
font-size: 0;
line-height: 0;
position: relative;
-ms-touch-action: none;
touch-action: none;
-webkit-user-select: none;
-moz-user-select: none;
-ms-user-select: none;
user-select: none;
}
.cropper-container img {
display: block;
height: 100%;
image-orientation: 0deg;
max-height: none !important;
max-width: none !important;
min-height: 0 !important;
min-width: 0 !important;
width: 100%;
}
.cropper-wrap-box,
.cropper-canvas,
.cropper-drag-box,
.cropper-crop-box,
.cropper-modal {
bottom: 0;
left: 0;
position: absolute;
right: 0;
top: 0;
}
.cropper-wrap-box,
.cropper-canvas {
overflow: hidden;
}
.cropper-drag-box {
background-color: #fff;
opacity: 0;
}
.cropper-modal {
background-color: #000;
opacity: .5;
}
.cropper-view-box {
display: block;
height: 100%;
outline-color: rgba(51, 153, 255, 0.75);
outline: 1px solid #39f;
overflow: hidden;
width: 100%;
}
.cropper-dashed {
border: 0 dashed #eee;
display: block;
opacity: .5;
position: absolute;
}
.cropper-dashed.dashed-h {
border-bottom-width: 1px;
border-top-width: 1px;
height: calc(100% / 3);
left: 0;
top: calc(100% / 3);
width: 100%;
}
.cropper-dashed.dashed-v {
border-left-width: 1px;
border-right-width: 1px;
height: 100%;
left: calc(100% / 3);
top: 0;
width: calc(100% / 3);
}
.cropper-center {
display: block;
height: 0;
left: 50%;
opacity: .75;
position: absolute;
top: 50%;
width: 0;
}
.cropper-center:before,
.cropper-center:after {
background-color: #eee;
content: ' ';
display: block;
position: absolute;
}
.cropper-center:before {
height: 1px;
left: -3px;
top: 0;
width: 7px;
}
.cropper-center:after {
height: 7px;
left: 0;
top: -3px;
width: 1px;
}
.cropper-face,
.cropper-line,
.cropper-point {
display: block;
height: 100%;
opacity: .1;
position: absolute;
width: 100%;
}
.cropper-face {
background-color: #fff;
left: 0;
top: 0;
}
.cropper-line {
background-color: #39f;
}
.cropper-line.line-e {
cursor: ew-resize;
right: -3px;
top: 0;
width: 5px;
}
.cropper-line.line-n {
cursor: ns-resize;
height: 5px;
left: 0;
top: -3px;
}
.cropper-line.line-w {
cursor: ew-resize;
left: -3px;
top: 0;
width: 5px;
}
.cropper-line.line-s {
bottom: -3px;
cursor: ns-resize;
height: 5px;
left: 0;
}
.cropper-point {
background-color: #39f;
height: 5px;
opacity: .75;
width: 5px;
}
.cropper-point.point-e {
cursor: ew-resize;
margin-top: -3px;
right: -3px;
top: 50%;
}
.cropper-point.point-n {
cursor: ns-resize;
left: 50%;
margin-left: -3px;
top: -3px;
}
.cropper-point.point-w {
cursor: ew-resize;
left: -3px;
margin-top: -3px;
top: 50%;
}
.cropper-point.point-s {
bottom: -3px;
cursor: s-resize;
left: 50%;
margin-left: -3px;
}
.cropper-point.point-ne {
cursor: nesw-resize;
right: -3px;
top: -3px;
}
.cropper-point.point-nw {
cursor: nwse-resize;
left: -3px;
top: -3px;
}
.cropper-point.point-sw {
bottom: -3px;
cursor: nesw-resize;
left: -3px;
}
.cropper-point.point-se {
bottom: -3px;
cursor: nwse-resize;
height: 20px;
opacity: 1;
right: -3px;
width: 20px;
}
@media (min-width: 768px) {
.cropper-point.point-se {
height: 15px;
width: 15px;
}
}
@media (min-width: 992px) {
.cropper-point.point-se {
height: 10px;
width: 10px;
}
}
@media (min-width: 1200px) {
.cropper-point.point-se {
height: 5px;
opacity: .75;
width: 5px;
}
}
.cropper-point.point-se:before {
background-color: #39f;
bottom: -50%;
content: ' ';
display: block;
height: 200%;
opacity: 0;
position: absolute;
right: -50%;
width: 200%;
}
.cropper-invisible {
opacity: 0;
}
.cropper-bg {
background-image: url('data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQAQMAAAAlPW0iAAAAA3NCSVQICAjb4U/gAAAABlBMVEXMzMz////TjRV2AAAACXBIWXMAAArrAAAK6wGCiw1aAAAAHHRFWHRTb2Z0d2FyZQBBZG9iZSBGaXJld29ya3MgQ1M26LyyjAAAABFJREFUCJlj+M/AgBVhF/0PAH6/D/HkDxOGAAAAAElFTkSuQmCC');
}
.cropper-hide {
display: block;
height: 0;
position: absolute;
width: 0;
}
.cropper-hidden {
display: none !important;
}
.cropper-move {
cursor: move;
}
.cropper-crop {
cursor: crosshair;
}
.cropper-disabled .cropper-drag-box,
.cropper-disabled .cropper-face,
.cropper-disabled .cropper-line,
.cropper-disabled .cropper-point {
cursor: not-allowed;
}
cropper-csscropper-js
/*!
* Cropper.js v1.4.3
* https://fengyuanchen.github.io/cropperjs
*
* Copyright 2015-present Chen Fengyuan
* Released under the MIT license
*
* Date: 2018-10-24T13:07:15.032Z
*/
(function (global, factory) {
typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
typeof define === 'function' && define.amd ? define(factory) :
global.layui && layui.define ? layui.define(function (exports) {
exports('cropper', factory())
}) :
(global.Cropper = factory());
}(this, (function () {
'use strict';
function _typeof(obj) {
if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") {
_typeof = function (obj) {
return typeof obj;
};
} else {
_typeof = function (obj) {
return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj;
};
}
return _typeof(obj);
}
function _classCallCheck(instance, Constructor) {
if (!(instance instanceof Constructor)) {
throw new TypeError("Cannot call a class as a function");
}
}
function _defineProperties(target, props) {
for (var i = 0; i < props.length; i++) {
var descriptor = props[i];
descriptor.enumerable = descriptor.enumerable || false;
descriptor.configurable = true;
if ("value" in descriptor) descriptor.writable = true;
Object.defineProperty(target, descriptor.key, descriptor);
}
}
function _createClass(Constructor, protoProps, staticProps) {
if (protoProps) _defineProperties(Constructor.prototype, protoProps);
if (staticProps) _defineProperties(Constructor, staticProps);
return Constructor;
}
function _toConsumableArray(arr) {
return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread();
}
function _arrayWithoutHoles(arr) {
if (Array.isArray(arr)) {
for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) arr2[i] = arr[i];
return arr2;
}
}
function _iterableToArray(iter) {
if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === "[object Arguments]") return Array.from(iter);
}
function _nonIterableSpread() {
throw new TypeError("Invalid attempt to spread non-iterable instance");
}
var IN_BROWSER = typeof window !== 'undefined';
var WINDOW = IN_BROWSER ? window : {};
var NAMESPACE = 'cropper'; // Actions
var ACTION_ALL = 'all';
var ACTION_CROP = 'crop';
var ACTION_MOVE = 'move';
var ACTION_ZOOM = 'zoom';
var ACTION_EAST = 'e';
var ACTION_WEST = 'w';
var ACTION_SOUTH = 's';
var ACTION_NORTH = 'n';
var ACTION_NORTH_EAST = 'ne';
var ACTION_NORTH_WEST = 'nw';
var ACTION_SOUTH_EAST = 'se';
var ACTION_SOUTH_WEST = 'sw'; // Classes
var CLASS_CROP = "".concat(NAMESPACE, "-crop");
var CLASS_DISABLED = "".concat(NAMESPACE, "-disabled");
var CLASS_HIDDEN = "".concat(NAMESPACE, "-hidden");
var CLASS_HIDE = "".concat(NAMESPACE, "-hide");
var CLASS_INVISIBLE = "".concat(NAMESPACE, "-invisible");
var CLASS_MODAL = "".concat(NAMESPACE, "-modal");
var CLASS_MOVE = "".concat(NAMESPACE, "-move"); // Data keys
var DATA_ACTION = "".concat(NAMESPACE, "Action");
var DATA_PREVIEW = "".concat(NAMESPACE, "Preview"); // Drag modes
var DRAG_MODE_CROP = 'crop';
var DRAG_MODE_MOVE = 'move';
var DRAG_MODE_NONE = 'none'; // Events
var EVENT_CROP = 'crop';
var EVENT_CROP_END = 'cropend';
var EVENT_CROP_MOVE = 'cropmove';
var EVENT_CROP_START = 'cropstart';
var EVENT_DBLCLICK = 'dblclick';
var EVENT_POINTER_DOWN = WINDOW.PointerEvent ? 'pointerdown' : 'touchstart mousedown';
var EVENT_POINTER_MOVE = WINDOW.PointerEvent ? 'pointermove' : 'touchmove mousemove';
var EVENT_POINTER_UP = WINDOW.PointerEvent ? 'pointerup pointercancel' : 'touchend touchcancel mouseup';
var EVENT_READY = 'ready';
var EVENT_RESIZE = 'resize';
var EVENT_WHEEL = 'wheel mousewheel DOMMouseScroll';
var EVENT_ZOOM = 'zoom'; // Mime types
var MIME_TYPE_JPEG = 'image/jpeg'; // 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_JPEG = /^data:image\/jpeg;base64,/;
var REGEXP_TAG_NAME = /^(?:img|canvas)$/i;
var DEFAULTS = {
// Define the view mode of the cropper
viewMode: 0,
// 0, 1, 2, 3
// Define the dragging mode of the cropper
dragMode: DRAG_MODE_CROP,
// 'crop', 'move' or 'none'
// Define the initial aspect ratio of the crop box
initialAspectRatio: NaN,
// Define the aspect ratio of the crop box
aspectRatio: NaN,
// An object with the previous cropping result data
data: null,
// A 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: false,
// 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
ready: null,
cropstart: null,
cropmove: null,
cropend: null,
crop: null,
zoom: null
};
var TEMPLATE = '<div class="cropper-container" touch-action="none">' + '<div class="cropper-wrap-box">' + '<div class="cropper-canvas"></div>' + '</div>' + '<div class="cropper-drag-box"></div>' + '<div class="cropper-crop-box">' + '<span class="cropper-view-box"></span>' + '<span class="cropper-dashed dashed-h"></span>' + '<span class="cropper-dashed dashed-v"></span>' + '<span class="cropper-center"></span>' + '<span class="cropper-face"></span>' + '<span class="cropper-line line-e" data-cropper-action="e"></span>' + '<span class="cropper-line line-n" data-cropper-action="n"></span>' + '<span class="cropper-line line-w" data-cropper-action="w"></span>' + '<span class="cropper-line line-s" data-cropper-action="s"></span>' + '<span class="cropper-point point-e" data-cropper-action="e"></span>' + '<span class="cropper-point point-n" data-cropper-action="n"></span>' + '<span class="cropper-point point-w" data-cropper-action="w"></span>' + '<span class="cropper-point point-s" data-cropper-action="s"></span>' + '<span class="cropper-point point-ne" data-cropper-action="ne"></span>' + '<span class="cropper-point point-nw" data-cropper-action="nw"></span>' + '<span class="cropper-point point-sw" data-cropper-action="sw"></span>' + '<span class="cropper-point point-se" data-cropper-action="se"></span>' + '</div>' + '</div>';
/**
* Check if the given value is not a number.
*/
var isNaN = Number.isNaN || WINDOW.isNaN;
/**
* Check if the given value is a number.
* @param {*} value - The value to check.
* @returns {boolean} Returns `true` if the given value is a number, else `false`.
*/
function isNumber(value) {
return typeof value === 'number' && !isNaN(value);
}
/**
* Check if the given value is undefined.
* @param {*} value - The value to check.
* @returns {boolean} Returns `true` if the given value is undefined, else `false`.
*/
function isUndefined(value) {
return typeof value === 'undefined';
}
/**
* Check if the given value is an object.
* @param {*} value - The value to check.
* @returns {boolean} Returns `true` if the given value is an object, else `false`.
*/
function isObject(value) {
return _typeof(value) === 'object' && value !== null;
}
var hasOwnProperty = Object.prototype.hasOwnProperty;
/**
* Check if the given value is a plain object.
* @param {*} value - The value to check.
* @returns {boolean} Returns `true` if the given value is a plain object, else `false`.
*/
function isPlainObject(value) {
if (!isObject(value)) {
return false;
}
try {
var _constructor = value.constructor;
var prototype = _constructor.prototype;
return _constructor && prototype && hasOwnProperty.call(prototype, 'isPrototypeOf');
} catch (e) {
return false;
}
}
/**
* Check if the given value is a function.
* @param {*} value - The value to check.
* @returns {boolean} Returns `true` if the given value is a function, else `false`.
*/
function isFunction(value) {
return typeof value === 'function';
}
/**
* Iterate the given data.
* @param {*} data - The data to iterate.
* @param {Function} callback - The process function for each element.
* @returns {*} The original data.
*/
function forEach(data, callback) {
if (data && isFunction(callback)) {
if (Array.isArray(data) || isNumber(data.length)
/* array-like */
) {
var length = data.length;
var i;
for (i = 0; i < length; i += 1) {
if (callback.call(data, data[i], i, data) === false) {
break;
}
}
} else if (isObject(data)) {
Object.keys(data).forEach(function (key) {
callback.call(data, data[key], key, data);
});
}
}
return data;
}
/**
* Extend the given object.
* @param {*} obj - The object to be extended.
* @param {*} args - The rest objects which will be merged to the first object.
* @returns {Object} The extended object.
*/
var assign = Object.assign || function assign(obj) {
for (var _len = arguments.length, args = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
args[_key - 1] = arguments[_key];
}
if (isObject(obj) && args.length > 0) {
args.forEach(function (arg) {
if (isObject(arg)) {
Object.keys(arg).forEach(function (key) {
obj[key] = arg[key];
});
}
});
}
return obj;
};
var REGEXP_DECIMALS = /\.\d*(?:0|9){12}\d*$/;
/**
* Normalize decimal number.
* Check out {@link http://0.30000000000000004.com/}
* @param {number} value - The value to normalize.
* @param {number} [times=100000000000] - The times for normalizing.
* @returns {number} Returns the normalized number.
*/
function normalizeDecimalNumber(value) {
var times = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 100000000000;
return REGEXP_DECIMALS.test(value) ? Math.round(value * times) / times : value;
}
var REGEXP_SUFFIX = /^(?:width|height|left|top|marginLeft|marginTop)$/;
/**
* Apply styles to the given element.
* @param {Element} element - The target element.
* @param {Object} styles - The styles for applying.
*/
function setStyle(element, styles) {
var style = element.style;
forEach(styles, function (value, property) {
if (REGEXP_SUFFIX.test(property) && isNumber(value)) {
value += 'px';
}
style[property] = value;
});
}
/**
* Check if the given element has a special class.
* @param {Element} element - The element to check.
* @param {string} value - The class to search.
* @returns {boolean} Returns `true` if the special class was found.
*/
function hasClass(element, value) {
return element.classList ? element.classList.contains(value) : element.className.indexOf(value) > -1;
}
/**
* Add classes to the given element.
* @param {Element} element - The target element.
* @param {string} value - The classes to be added.
*/
function addClass(element, value) {
if (!value) {
return;
}
if (isNumber(element.length)) {
forEach(element, function (elem) {
addClass(elem, value);
});
return;
}
if (element.classList) {
element.classList.add(value);
return;
}
var className = element.className.trim();
if (!className) {
element.className = value;
} else if (className.indexOf(value) < 0) {
element.className = "".concat(className, " ").concat(value);
}
}
/**
* Remove classes from the given element.
* @param {Element} element - The target element.
* @param {string} value - The classes to be removed.
*/
function removeClass(element, value) {
if (!value) {
return;
}
if (isNumber(element.length)) {
forEach(element, function (elem) {
removeClass(elem, value);
});
return;
}
if (element.classList) {
element.classList.remove(value);
return;
}
if (element.className.indexOf(value) >= 0) {
element.className = element.className.replace(value, '');
}
}
/**
* Add or remove classes from the given element.
* @param {Element} element - The target element.
* @param {string} value - The classes to be toggled.
* @param {boolean} added - Add only.
*/
function toggleClass(element, value, added) {
if (!value) {
return;
}
if (isNumber(element.length)) {
forEach(element, function (elem) {
toggleClass(elem, value, added);
});
return;
} // IE10-11 doesn't support the second parameter of `classList.toggle`
if (added) {
addClass(element, value);
} else {
removeClass(element, value);
}
}
var REGEXP_HYPHENATE = /([a-z\d])([A-Z])/g;
/**
* Transform the given string from camelCase to kebab-case
* @param {string} value - The value to transform.
* @returns {string} The transformed value.
*/
function hyphenate(value) {
return value.replace(REGEXP_HYPHENATE, '$1-$2').toLowerCase();
}
/**
* Get data from the given element.
* @param {Element} element - The target element.
* @param {string} name - The data key to get.
* @returns {string} The data value.
*/
function getData(element, name) {
if (isObject(element[name])) {
return element[name];
}
if (element.dataset) {
return element.dataset[name];
}
return element.getAttribute("data-".concat(hyphenate(name)));
}
/**
* Set data to the given element.
* @param {Element} element - The target element.
* @param {string} name - The data key to set.
* @param {string} data - The data value.
*/
function setData(element, name, data) {
if (isObject(data)) {
element[name] = data;
} else if (element.dataset) {
element.dataset[name] = data;
} else {
element.setAttribute("data-".concat(hyphenate(name)), data);
}
}
/**
* Remove data from the given element.
* @param {Element} element - The target element.
* @param {string} name - The data key to remove.
*/
function removeData(element, name) {
if (isObject(element[name])) {
try {
delete element[name];
} catch (e) {
element[name] = undefined;
}
} else if (element.dataset) {
// #128 Safari not allows to delete dataset property
try {
delete element.dataset[name];
} catch (e) {
element.dataset[name] = undefined;
}
} else {
element.removeAttribute("data-".concat(hyphenate(name)));
}
}
var REGEXP_SPACES = /\s\s*/;
var onceSupported = function () {
var supported = false;
if (IN_BROWSER) {
var once = false;
var listener = function listener() {
};
var options = Object.defineProperty({}, 'once', {
get: function get() {
supported = true;
return once;
},
/**
* This setter can fix a `TypeError` in strict mode
* {@link https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Errors/Getter_only}
* @param {boolean} value - The value to set
*/
set: function set(value) {
once = value;
}
});
WINDOW.addEventListener('test', listener, options);
WINDOW.removeEventListener('test', listener, options);
}
return supported;
}();
/**
* Remove event listener from the target element.
* @param {Element} element - The event target.
* @param {string} type - The event type(s).
* @param {Function} listener - The event listener.
* @param {Object} options - The event options.
*/
function removeListener(element, type, listener) {
var options = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : {};
var handler = listener;
type.trim().split(REGEXP_SPACES).forEach(function (event) {
if (!onceSupported) {
var listeners = element.listeners;
if (listeners && listeners[event] && listeners[event][listener]) {
handler = listeners[event][listener];
delete listeners[event][listener];
if (Object.keys(listeners[event]).length === 0) {
delete listeners[event];
}
if (Object.keys(listeners).length === 0) {
delete element.listeners;
}
}
}
element.removeEventListener(event, handler, options);
});
}
/**
* Add event listener to the target element.
* @param {Element} element - The event target.
* @param {string} type - The event type(s).
* @param {Function} listener - The event listener.
* @param {Object} options - The event options.
*/
function addListener(element, type, listener) {
var options = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : {};
var _handler = listener;
type.trim().split(REGEXP_SPACES).forEach(function (event) {
if (options.once && !onceSupported) {
var _element$listeners = element.listeners,
listeners = _element$listeners === void 0 ? {} : _element$listeners;
_handler = function handler() {
delete listeners[event][listener];
element.removeEventListener(event, _handler, options);
for (var _len2 = arguments.length, args = new Array(_len2), _key2 = 0; _key2 < _len2; _key2++) {
args[_key2] = arguments[_key2];
}
listener.apply(element, args);
};
if (!listeners[event]) {
listeners[event] = {};
}
if (listeners[event][listener]) {
element.removeEventListener(event, listeners[event][listener], options);
}
listeners[event][listener] = _handler;
element.listeners = listeners;
}
element.addEventListener(event, _handler, options);
});
}
/**
* Dispatch event on the target element.
* @param {Element} element - The event target.
* @param {string} type - The event type(s).
* @param {Object} data - The additional event data.
* @returns {boolean} Indicate if the event is default prevented or not.
*/
function dispatchEvent(element, type, data) {
var event; // Event and CustomEvent on IE9-11 are global objects, not constructors
if (isFunction(Event) && isFunction(CustomEvent)) {
event = new CustomEvent(type, {
detail: data,
bubbles: true,
cancelable: true
});
} else {
event = document.createEvent('CustomEvent');
event.initCustomEvent(type, true, true, data);
}
return element.dispatchEvent(event);
}
/**
* Get the offset base on the document.
* @param {Element} element - The target element.
* @returns {Object} The offset data.
*/
function getOffset(element) {
var box = element.getBoundingClientRect();
return {
left: box.left + (window.pageXOffset - document.documentElement.clientLeft),
top: box.top + (window.pageYOffset - document.documentElement.clientTop)
};
}
var location = WINDOW.location;
var REGEXP_ORIGINS = /^(https?:)\/\/([^:/?#]+):?(\d*)/i;
/**
* Check if the given URL is a cross origin URL.
* @param {string} url - The target URL.
* @returns {boolean} Returns `true` if the given URL is a cross origin URL, else `false`.
*/
function isCrossOriginURL(url) {
var parts = url.match(REGEXP_ORIGINS);
return parts && (parts[1] !== location.protocol || parts[2] !== location.hostname || parts[3] !== location.port);
}
/**
* Add timestamp to the given URL.
* @param {string} url - The target URL.
* @returns {string} The result URL.
*/
function addTimestamp(url) {
var timestamp = "timestamp=".concat(new Date().getTime());
return url + (url.indexOf('?') === -1 ? '?' : '&') + timestamp;
}
/**
* Get transforms base on the given object.
* @param {Object} obj - The target object.
* @returns {string} A string contains transform values.
*/
function getTransforms(_ref) {
var rotate = _ref.rotate,
scaleX = _ref.scaleX,
scaleY = _ref.scaleY,
translateX = _ref.translateX,
translateY = _ref.translateY;
var values = [];
if (isNumber(translateX) && translateX !== 0) {
values.push("translateX(".concat(translateX, "px)"));
}
if (isNumber(translateY) && translateY !== 0) {
values.push("translateY(".concat(translateY, "px)"));
} // Rotate should come first before scale to match orientation transform
if (isNumber(rotate) && rotate !== 0) {
values.push("rotate(".concat(rotate, "deg)"));
}
if (isNumber(scaleX) && scaleX !== 1) {
values.push("scaleX(".concat(scaleX, ")"));
}
if (isNumber(scaleY) && scaleY !== 1) {
values.push("scaleY(".concat(scaleY, ")"));
}
var transform = values.length ? values.join(' ') : 'none';
return {
WebkitTransform: transform,
msTransform: transform,
transform: transform
};
}
/**
* Get the max ratio of a group of pointers.
* @param {string} pointers - The target pointers.
* @returns {number} The result ratio.
*/
function getMaxZoomRatio(pointers) {
var pointers2 = assign({}, pointers);
var ratios = [];
forEach(pointers, function (pointer, pointerId) {
delete pointers2[pointerId];
forEach(pointers2, function (pointer2) {
var x1 = Math.abs(pointer.startX - pointer2.startX);
var y1 = Math.abs(pointer.startY - pointer2.startY);
var x2 = Math.abs(pointer.endX - pointer2.endX);
var y2 = Math.abs(pointer.endY - pointer2.endY);
var z1 = Math.sqrt(x1 * x1 + y1 * y1);
var z2 = Math.sqrt(x2 * x2 + y2 * y2);
var ratio = (z2 - z1) / z1;
ratios.push(ratio);
});
});
ratios.sort(function (a, b) {
return Math.abs(a) < Math.abs(b);
});
return ratios[0];
}
/**
* Get a pointer from an event object.
* @param {Object} event - The target event object.
* @param {boolean} endOnly - Indicates if only returns the end point coordinate or not.
* @returns {Object} The result pointer contains start and/or end point coordinates.
*/
function getPointer(_ref2, endOnly) {
var pageX = _ref2.pageX,
pageY = _ref2.pageY;
var end = {
endX: pageX,
endY: pageY
};
return endOnly ? end : assign({
startX: pageX,
startY: pageY
}, end);
}
/**
* Get the center point coordinate of a group of pointers.
* @param {Object} pointers - The target pointers.
* @returns {Object} The center point coordinate.
*/
function getPointersCenter(pointers) {
var pageX = 0;
var pageY = 0;
var count = 0;
forEach(pointers, function (_ref3) {
var startX = _ref3.startX,
startY = _ref3.startY;
pageX += startX;
pageY += startY;
count += 1;
});
pageX /= count;
pageY /= count;
return {
pageX: pageX,
pageY: pageY
};
}
/**
* Check if the given value is a finite number.
*/
var isFinite = Number.isFinite || WINDOW.isFinite;
/**
* Get the max sizes in a rectangle under the given aspect ratio.
* @param {Object} data - The original sizes.
* @param {string} [type='contain'] - The adjust type.
* @returns {Object} The result sizes.
*/
function getAdjustedSizes(_ref4) // or 'cover'
{
var aspectRatio = _ref4.aspectRatio,
height = _ref4.height,
width = _ref4.width;
var type = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 'contain';
var isValidNumber = function isValidNumber(value) {
return isFinite(value) && value > 0;
};
if (isValidNumber(width) && isValidNumber(height)) {
var adjustedWidth = height * aspectRatio;
if (type === 'contain' && adjustedWidth > width || type === 'cover' && adjustedWidth < width) {
height = width / aspectRatio;
} else {
width = height * aspectRatio;
}
} else if (isValidNumber(width)) {
height = width / aspectRatio;
} else if (isValidNumber(height)) {
width = height * aspectRatio;
}
return {
width: width,
height: height
};
}
/**
* Get the new sizes of a rectangle after rotated.
* @param {Object} data - The original sizes.
* @returns {Object} The result sizes.
*/
function getRotatedSizes(_ref5) {
var width = _ref5.width,
height = _ref5.height,
degree = _ref5.degree;
degree = Math.abs(degree) % 180;
if (degree === 90) {
return {
width: height,
height: width
};
}
var arc = degree % 90 * Math.PI / 180;
var sinArc = Math.sin(arc);
var cosArc = Math.cos(arc);
var newWidth = width * cosArc + height * sinArc;
var newHeight = width * sinArc + height * cosArc;
return degree > 90 ? {
width: newHeight,
height: newWidth
} : {
width: newWidth,
height: newHeight
};
}
/**
* Get a canvas which drew the given image.
* @param {HTMLImageElement} image - The image for drawing.
* @param {Object} imageData - The image data.
* @param {Object} canvasData - The canvas data.
* @param {Object} options - The options.
* @returns {HTMLCanvasElement} The result canvas.
*/
function getSourceCanvas(image, _ref6, _ref7, _ref8) {
var imageAspectRatio = _ref6.aspectRatio,
imageNaturalWidth = _ref6.naturalWidth,
imageNaturalHeight = _ref6.naturalHeight,
_ref6$rotate = _ref6.rotate,
rotate = _ref6$rotate === void 0 ? 0 : _ref6$rotate,
_ref6$scaleX = _ref6.scaleX,
scaleX = _ref6$scaleX === void 0 ? 1 : _ref6$scaleX,
_ref6$scaleY = _ref6.scaleY,
scaleY = _ref6$scaleY === void 0 ? 1 : _ref6$scaleY;
var aspectRatio = _ref7.aspectRatio,
naturalWidth = _ref7.naturalWidth,
naturalHeight = _ref7.naturalHeight;
var _ref8$fillColor = _ref8.fillColor,
fillColor = _ref8$fillColor === void 0 ? 'transparent' : _ref8$fillColor,
_ref8$imageSmoothingE = _ref8.imageSmoothingEnabled,
imageSmoothingEnabled = _ref8$imageSmoothingE === void 0 ? true : _ref8$imageSmoothingE,
_ref8$imageSmoothingQ = _ref8.imageSmoothingQuality,
imageSmoothingQuality = _ref8$imageSmoothingQ === void 0 ? 'low' : _ref8$imageSmoothingQ,
_ref8$maxWidth = _ref8.maxWidth,
maxWidth = _ref8$maxWidth === void 0 ? Infinity : _ref8$maxWidth,
_ref8$maxHeight = _ref8.maxHeight,
maxHeight = _ref8$maxHeight === void 0 ? Infinity : _ref8$maxHeight,
_ref8$minWidth = _ref8.minWidth,
minWidth = _ref8$minWidth === void 0 ? 0 : _ref8$minWidth,
_ref8$minHeight = _ref8.minHeight,
minHeight = _ref8$minHeight === void 0 ? 0 : _ref8$minHeight;
var canvas = document.createElement('canvas');
var context = canvas.getContext('2d');
var maxSizes = getAdjustedSizes({
aspectRatio: aspectRatio,
width: maxWidth,
height: maxHeight
});
var minSizes = getAdjustedSizes({
aspectRatio: aspectRatio,
width: minWidth,
height: minHeight
}, 'cover');
var width = Math.min(maxSizes.width, Math.max(minSizes.width, naturalWidth));
var height = Math.min(maxSizes.height, Math.max(minSizes.height, naturalHeight)); // Note: should always use image's natural sizes for drawing as
// imageData.naturalWidth === canvasData.naturalHeight when rotate % 180 === 90
var destMaxSizes = getAdjustedSizes({
aspectRatio: imageAspectRatio,
width: maxWidth,
height: maxHeight
});
var destMinSizes = getAdjustedSizes({
aspectRatio: imageAspectRatio,
width: minWidth,
height: minHeight
}, 'cover');
var destWidth = Math.min(destMaxSizes.width, Math.max(destMinSizes.width, imageNaturalWidth));
var destHeight = Math.min(destMaxSizes.height, Math.max(destMinSizes.height, imageNaturalHeight));
var params = [-destWidth / 2, -destHeight / 2, destWidth, destHeight];
canvas.width = normalizeDecimalNumber(width);
canvas.height = normalizeDecimalNumber(height);
context.fillStyle = fillColor;
context.fillRect(0, 0, width, height);
context.save();
context.translate(width / 2, height / 2);
context.rotate(rotate * Math.PI / 180);
context.scale(scaleX, scaleY);
context.imageSmoothingEnabled = imageSmoothingEnabled;
context.imageSmoothingQuality = imageSmoothingQuality;
context.drawImage.apply(context, [image].concat(_toConsumableArray(params.map(function (param) {
return Math.floor(normalizeDecimalNumber(param));
}))));
context.restore();
return canvas;
}
var fromCharCode = String.fromCharCode;
/**
* Get string from char code in data view.
* @param {DataView} dataView - The data view for read.
* @param {number} start - The start index.
* @param {number} length - The read length.
* @returns {string} The read result.
*/
function getStringFromCharCode(dataView, start, length) {
var str = '';
var i;
length += start;
for (i = start; i < length; i += 1) {
str += fromCharCode(dataView.getUint8(i));
}
return str;
}
var REGEXP_DATA_URL_HEAD = /^data:.*,/;
/**
* Transform Data URL to array buffer.
* @param {string} dataURL - The Data URL to transform.
* @returns {ArrayBuffer} The result array buffer.
*/
function dataURLToArrayBuffer(dataURL) {
var base64 = dataURL.replace(REGEXP_DATA_URL_HEAD, '');
var binary = atob(base64);
var arrayBuffer = new ArrayBuffer(binary.length);
var uint8 = new Uint8Array(arrayBuffer);
forEach(uint8, function (value, i) {
uint8[i] = binary.charCodeAt(i);
});
return arrayBuffer;
}
/**
* Transform array buffer to Data URL.
* @param {ArrayBuffer} arrayBuffer - The array buffer to transform.
* @param {string} mimeType - The mime type of the Data URL.
* @returns {string} The result Data URL.
*/
function arrayBufferToDataURL(arrayBuffer, mimeType) {
var chunks = [];
var chunkSize = 8192;
var uint8 = new Uint8Array(arrayBuffer);
while (uint8.length > 0) {
chunks.push(fromCharCode.apply(void 0, _toConsumableArray(uint8.subarray(0, chunkSize))));
uint8 = uint8.subarray(chunkSize);
}
return "data:".concat(mimeType, ";base64,").concat(btoa(chunks.join('')));
}
/**
* Get orientation value from given array buffer.
* @param {ArrayBuffer} arrayBuffer - The array buffer to read.
* @returns {number} The read orientation value.
*/
function resetAndGetOrientation(arrayBuffer) {
var dataView = new DataView(arrayBuffer);
var orientation; // Ignores range error when the image does not have correct Exif information
try {
var littleEndian;
var app1Start;
var ifdStart; // Only handle JPEG image (start by 0xFFD8)
if (dataView.getUint8(0) === 0xFF && dataView.getUint8(1) === 0xD8) {
var length = dataView.byteLength;
var offset = 2;
while (offset + 1 < length) {
if (dataView.getUint8(offset) === 0xFF && dataView.getUint8(offset + 1) === 0xE1) {
app1Start = offset;
break;
}
offset += 1;
}
}
if (app1Start) {
var exifIDCode = app1Start + 4;
var tiffOffset = app1Start + 10;
if (getStringFromCharCode(dataView, exifIDCode, 4) === 'Exif') {
var endianness = dataView.getUint16(tiffOffset);
littleEndian = endianness === 0x4949;
if (littleEndian || endianness === 0x4D4D
/* bigEndian */
) {
if (dataView.getUint16(tiffOffset + 2, littleEndian) === 0x002A) {
var firstIFDOffset = dataView.getUint32(tiffOffset + 4, littleEndian);
if (firstIFDOffset >= 0x00000008) {
ifdStart = tiffOffset + firstIFDOffset;
}
}
}
}
}
if (ifdStart) {
var _length = dataView.getUint16(ifdStart, littleEndian);
var _offset;
var i;
for (i = 0; i < _length; i += 1) {
_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
dataView.setUint16(_offset, 1, littleEndian);
break;
}
}
}
} catch (e) {
orientation = 1;
}
return orientation;
}
/**
* Parse Exif Orientation value.
* @param {number} orientation - The orientation to parse.
* @returns {Object} The parsed result.
*/
function parseOrientation(orientation) {
var rotate = 0;
var scaleX = 1;
var scaleY = 1;
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 and rotate right 90°
case 5:
rotate = 90;
scaleY = -1;
break;
// Rotate right 90°
case 6:
rotate = 90;
break;
// Flip horizontal and rotate right 90°
case 7:
rotate = 90;
scaleX = -1;
break;
// Rotate left 90°
case 8:
rotate = -90;
break;
default:
}
return {
rotate: rotate,
scaleX: scaleX,
scaleY: scaleY
};
}
var render = {
render: function render() {
this.initContainer();
this.initCanvas();
this.initCropBox();
this.renderCanvas();
if (this.cropped) {
this.renderCropBox();
}
},
initContainer: function initContainer() {
var element = this.element,
options = this.options,
container = this.container,
cropper = this.cropper;
addClass(cropper, CLASS_HIDDEN);
removeClass(element, CLASS_HIDDEN);
var containerData = {
width: Math.max(container.offsetWidth, Number(options.minContainerWidth) || 200),
height: Math.max(container.offsetHeight, Number(options.minContainerHeight) || 100)
};
this.containerData = containerData;
setStyle(cropper, {
width: containerData.width,
height: containerData.height
});
addClass(element, CLASS_HIDDEN);
removeClass(cropper, CLASS_HIDDEN);
},
// Canvas (image wrapper)
initCanvas: function initCanvas() {
var containerData = this.containerData,
imageData = this.imageData;
var viewMode = this.options.viewMode;
var rotated = Math.abs(imageData.rotate) % 180 === 90;
var naturalWidth = rotated ? imageData.naturalHeight : imageData.naturalWidth;
var naturalHeight = rotated ? imageData.naturalWidth : imageData.naturalHeight;
var aspectRatio = naturalWidth / naturalHeight;
var canvasWidth = containerData.width;
var canvasHeight = containerData.height;
if (containerData.height * aspectRatio > containerData.width) {
if (viewMode === 3) {
canvasWidth = containerData.height * aspectRatio;
} else {
canvasHeight = containerData.width / aspectRatio;
}
} else if (viewMode === 3) {
canvasHeight = containerData.width / aspectRatio;
} else {
canvasWidth = containerData.height * aspectRatio;
}
var canvasData = {
aspectRatio: aspectRatio,
naturalWidth: naturalWidth,
naturalHeight: naturalHeight,
width: canvasWidth,
height: canvasHeight
};
canvasData.left = (containerData.width - canvasWidth) / 2;
canvasData.top = (containerData.height - canvasHeight) / 2;
canvasData.oldLeft = canvasData.left;
canvasData.oldTop = canvasData.top;
this.canvasData = canvasData;
this.limited = viewMode === 1 || viewMode === 2;
this.limitCanvas(true, true);
this.initialImageData = assign({}, imageData);
this.initialCanvasData = assign({}, canvasData);
},
limitCanvas: function limitCanvas(sizeLimited, positionLimited) {
var options = this.options,
containerData = this.containerData,
canvasData = this.canvasData,
cropBoxData = this.cropBoxData;
var viewMode = options.viewMode;
var aspectRatio = canvasData.aspectRatio;
var cropped = this.cropped && cropBoxData;
if (sizeLimited) {
var minCanvasWidth = Number(options.minCanvasWidth) || 0;
var minCanvasHeight = Number(options.minCanvasHeight) || 0;
if (viewMode > 1) {
minCanvasWidth = Math.max(minCanvasWidth, containerData.width);
minCanvasHeight = Math.max(minCanvasHeight, containerData.height);
if (viewMode === 3) {
if (minCanvasHeight * aspectRatio > minCanvasWidth) {
minCanvasWidth = minCanvasHeight * aspectRatio;
} else {
minCanvasHeight = minCanvasWidth / aspectRatio;
}
}
} else if (viewMode > 0) {
if (minCanvasWidth) {
minCanvasWidth = Math.max(minCanvasWidth, cropped ? cropBoxData.width : 0);
} else if (minCanvasHeight) {
minCanvasHeight = Math.max(minCanvasHeight, cropped ? cropBoxData.height : 0);
} else if (cropped) {
minCanvasWidth = cropBoxData.width;
minCanvasHeight = cropBoxData.height;
if (minCanvasHeight * aspectRatio > minCanvasWidth) {
minCanvasWidth = minCanvasHeight * aspectRatio;
} else {
minCanvasHeight = minCanvasWidth / aspectRatio;
}
}
}
var _getAdjustedSizes = getAdjustedSizes({
aspectRatio: aspectRatio,
width: minCanvasWidth,
height: minCanvasHeight
});
minCanvasWidth = _getAdjustedSizes.width;
minCanvasHeight = _getAdjustedSizes.height;
canvasData.minWidth = minCanvasWidth;
canvasData.minHeight = minCanvasHeight;
canvasData.maxWidth = Infinity;
canvasData.maxHeight = Infinity;
}
if (positionLimited) {
if (viewMode > (cropped ? 0 : 1)) {
var newCanvasLeft = containerData.width - canvasData.width;
var newCanvasTop = containerData.height - canvasData.height;
canvasData.minLeft = Math.min(0, newCanvasLeft);
canvasData.minTop = Math.min(0, newCanvasTop);
canvasData.maxLeft = Math.max(0, newCanvasLeft);
canvasData.maxTop = Math.max(0, newCanvasTop);
if (cropped && this.limited) {
canvasData.minLeft = Math.min(cropBoxData.left, cropBoxData.left + (cropBoxData.width - canvasData.width));
canvasData.minTop = Math.min(cropBoxData.top, cropBoxData.top + (cropBoxData.height - canvasData.height));
canvasData.maxLeft = cropBoxData.left;
canvasData.maxTop = cropBoxData.top;
if (viewMode === 2) {
if (canvasData.width >= containerData.width) {
canvasData.minLeft = Math.min(0, newCanvasLeft);
canvasData.maxLeft = Math.max(0, newCanvasLeft);
}
if (canvasData.height >= containerData.height) {
canvasData.minTop = Math.min(0, newCanvasTop);
canvasData.maxTop = Math.max(0, newCanvasTop);
}
}
}
} else {
canvasData.minLeft = -canvasData.width;
canvasData.minTop = -canvasData.height;
canvasData.maxLeft = containerData.width;
canvasData.maxTop = containerData.height;
}
}
},
renderCanvas: function renderCanvas(changed, transformed) {
var canvasData = this.canvasData,
imageData = this.imageData;
if (transformed) {
var _getRotatedSizes = getRotatedSizes({
width: imageData.naturalWidth * Math.abs(imageData.scaleX || 1),
height: imageData.naturalHeight * Math.abs(imageData.scaleY || 1),
degree: imageData.rotate || 0
}),
naturalWidth = _getRotatedSizes.width,
naturalHeight = _getRotatedSizes.height;
var width = canvasData.width * (naturalWidth / canvasData.naturalWidth);
var height = canvasData.height * (naturalHeight / canvasData.naturalHeight);
canvasData.left -= (width - canvasData.width) / 2;
canvasData.top -= (height - canvasData.height) / 2;
canvasData.width = width;
canvasData.height = height;
canvasData.aspectRatio = naturalWidth / naturalHeight;
canvasData.naturalWidth = naturalWidth;
canvasData.naturalHeight = naturalHeight;
this.limitCanvas(true, false);
}
if (canvasData.width > canvasData.maxWidth || canvasData.width < canvasData.minWidth) {
canvasData.left = canvasData.oldLeft;
}
if (canvasData.height > canvasData.maxHeight || canvasData.height < canvasData.minHeight) {
canvasData.top = canvasData.oldTop;
}
canvasData.width = Math.min(Math.max(canvasData.width, canvasData.minWidth), canvasData.maxWidth);
canvasData.height = Math.min(Math.max(canvasData.height, canvasData.minHeight), canvasData.maxHeight);
this.limitCanvas(false, true);
canvasData.left = Math.min(Math.max(canvasData.left, canvasData.minLeft), canvasData.maxLeft);
canvasData.top = Math.min(Math.max(canvasData.top, canvasData.minTop), canvasData.maxTop);
canvasData.oldLeft = canvasData.left;
canvasData.oldTop = canvasData.top;
setStyle(this.canvas, assign({
width: canvasData.width,
height: canvasData.height
}, getTransforms({
translateX: canvasData.left,
translateY: canvasData.top
})));
this.renderImage(changed);
if (this.cropped && this.limited) {
this.limitCropBox(true, true);
}
},
renderImage: function renderImage(changed) {
var canvasData = this.canvasData,
imageData = this.imageData;
var width = imageData.naturalWidth * (canvasData.width / canvasData.naturalWidth);
var height = imageData.naturalHeight * (canvasData.height / canvasData.naturalHeight);
assign(imageData, {
width: width,
height: height,
left: (canvasData.width - width) / 2,
top: (canvasData.height - height) / 2
});
setStyle(this.image, assign({
width: imageData.width,
height: imageData.height
}, getTransforms(assign({
translateX: imageData.left,
translateY: imageData.top
}, imageData))));
if (changed) {
this.output();
}
},
initCropBox: function initCropBox() {
var options = this.options,
canvasData = this.canvasData;
var aspectRatio = options.aspectRatio || options.initialAspectRatio;
var autoCropArea = Number(options.autoCropArea) || 0.8;
var cropBoxData = {
width: canvasData.width,
height: canvasData.height
};
if (aspectRatio) {
if (canvasData.height * aspectRatio > canvasData.width) {
cropBoxData.height = cropBoxData.width / aspectRatio;
} else {
cropBoxData.width = cropBoxData.height * aspectRatio;
}
}
this.cropBoxData = cropBoxData;
this.limitCropBox(true, true); // Initialize auto crop area
cropBoxData.width = Math.min(Math.max(cropBoxData.width, cropBoxData.minWidth), cropBoxData.maxWidth);
cropBoxData.height = Math.min(Math.max(cropBoxData.height, cropBoxData.minHeight), cropBoxData.maxHeight); // The width/height of auto crop area must large than "minWidth/Height"
cropBoxData.width = Math.max(cropBoxData.minWidth, cropBoxData.width * autoCropArea);
cropBoxData.height = Math.max(cropBoxData.minHeight, cropBoxData.height * autoCropArea);
cropBoxData.left = canvasData.left + (canvasData.width - cropBoxData.width) / 2;
cropBoxData.top = canvasData.top + (canvasData.height - cropBoxData.height) / 2;
cropBoxData.oldLeft = cropBoxData.left;
cropBoxData.oldTop = cropBoxData.top;
this.initialCropBoxData = assign({}, cropBoxData);
},
limitCropBox: function limitCropBox(sizeLimited, positionLimited) {
var options = this.options,
containerData = this.containerData,
canvasData = this.canvasData,
cropBoxData = this.cropBoxData,
limited = this.limited;
var aspectRatio = options.aspectRatio;
if (sizeLimited) {
var minCropBoxWidth = Number(options.minCropBoxWidth) || 0;
var minCropBoxHeight = Number(options.minCropBoxHeight) || 0;
var maxCropBoxWidth = limited ? Math.min(containerData.width, canvasData.width, canvasData.width + canvasData.left, containerData.width - canvasData.left) : containerData.width;
var maxCropBoxHeight = limited ? Math.min(containerData.height, canvasData.height, canvasData.height + canvasData.top, containerData.height - canvasData.top) : containerData.height; // The min/maxCropBoxWidth/Height must be less than container's width/height
minCropBoxWidth = Math.min(minCropBoxWidth, containerData.width);
minCropBoxHeight = Math.min(minCropBoxHeight, containerData.height);
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
cropBoxData.minWidth = Math.min(minCropBoxWidth, maxCropBoxWidth);
cropBoxData.minHeight = Math.min(minCropBoxHeight, maxCropBoxHeight);
cropBoxData.maxWidth = maxCropBoxWidth;
cropBoxData.maxHeight = maxCropBoxHeight;
}
if (positionLimited) {
if (limited) {
cropBoxData.minLeft = Math.max(0, canvasData.left);
cropBoxData.minTop = Math.max(0, canvasData.top);
cropBoxData.maxLeft = Math.min(containerData.width, canvasData.left + canvasData.width) - cropBoxData.width;
cropBoxData.maxTop = Math.min(containerData.height, canvasData.top + canvasData.height) - cropBoxData.height;
} else {
cropBoxData.minLeft = 0;
cropBoxData.minTop = 0;
cropBoxData.maxLeft = containerData.width - cropBoxData.width;
cropBoxData.maxTop = containerData.height - cropBoxData.height;
}
}
},
renderCropBox: function renderCropBox() {
var options = this.options,
containerData = this.containerData,
cropBoxData = this.cropBoxData;
if (cropBoxData.width > cropBoxData.maxWidth || cropBoxData.width < cropBoxData.minWidth) {
cropBoxData.left = cropBoxData.oldLeft;
}
if (cropBoxData.height > cropBoxData.maxHeight || cropBoxData.height < cropBoxData.minHeight) {
cropBoxData.top = cropBoxData.oldTop;
}
cropBoxData.width = Math.min(Math.max(cropBoxData.width, cropBoxData.minWidth), cropBoxData.maxWidth);
cropBoxData.height = Math.min(Math.max(cropBoxData.height, cropBoxData.minHeight), cropBoxData.maxHeight);
this.limit
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