August 20, 2015

jQuery 缩放旋转裁剪图片 Image Cropper

By Gideon Javascript /Jquery / React / Bootstrap / Web 0 Comments

A simple jQuery image cropping plugin.

Demo

cropper是一款使用简单且功能强大的图片剪裁jQuery插件。该图片剪裁插件支持图片放大缩小，支持图片旋转，支持触摸屏设备，支持canvas，并且支持跨浏览器使用。

Features

Supports touch
Supports zoom
Supports rotation
Supports canvas
Supports options
Supports methods
Supports events
Supports multiple croppers
Supports RTL
Cross-browser support

Main

dist/
├── cropper.css     ( 5 KB)
├── cropper.min.css ( 4 KB)
├── cropper.js      (63 KB)
└── cropper.min.js  (23 KB)

Getting started

Quick start

Four quick start options are available:

Download the latest release.
Clone the repository: git clone https://github.com/fengyuanchen/cropper.git.
Install with NPM: npm install cropper.
Install with Bower: bower install cropper.

Installation

Include files:

<script src="/path/to/jquery.js"></script><!-- jQuery is required -->
<link  href="/path/to/cropper.css" rel="stylesheet">
<script src="/path/to/cropper.js"></script>

CDNJS

The CDNJS provides CDN support for Cropper’s CSS and JavaScript. You can find the links here.

RawGit

<link  href="https://cdn.rawgit.com/fengyuanchen/cropper/v0.11.0/dist/cropper.min.css" rel="stylesheet">
<script src="https://cdn.rawgit.com/fengyuanchen/cropper/v0.11.0/dist/cropper.min.js"></script>

Usage

Initialize with $.fn.cropper method.

RawGit

<!-- Wrap the image or canvas element with a block element -->
<div class="container">
  <img src="picture.jpg">
</div>

$('.container > img').cropper({
  aspectRatio: 16 / 9,
  crop: function(e) {
    // Output the result data for cropping image.
    console.log(e.x);
    console.log(e.y);
    console.log(e.width);
    console.log(e.height);
    console.log(e.rotate);
    console.log(e.scaleX);
    console.log(e.scaleY);
  }
});

Notes

The size of the cropper inherits from the size of the image’s parent element (wrapper), so be sure to wrap the image with a visible block element.
The outputted cropped data bases on the original image size, so you can use them to crop the image directly.
If you try to start cropper on a cross-origin image, please make sure that your browser supports HTML5 CORS settings attributes, and your image server supports the Access-Control-Allow-Origin option.

Known issues

About getCroppedCanvas method: The canvas.drawImage API in some Mac OS / iOS browsers will rotate an image with EXIF Orientation automatically, so the output cropped canvas may be incorrect. To fix this, you may upload the cropped data and crop the image in the server-side, see the example: Crop Avatar. Or you may handle the EXIF Orientation in server first before to use cropper.
Known iOS resource limits: As iOS devices limit memory, the browser may crash when you are cropping a large image (iPhone camera resolution). To avoid this, you may resize the image first (below 1024px) before start a cropper.

Options

You may set cropper options with $().cropper(options). If you want to change the global default options, You may use $.fn.cropper.setDefaults(options).

aspectRatio

Type: Number
Default: NaN

Set the aspect ratio of the crop box. By default, the crop box is free ratio.

data

Type: Object
Default: null

The previous cropped data if you had stored, will be passed to setData method automatically.

preview

Type: String (jQuery selector)
Default: ''

Add extra elements (containers) for previewing.

Notes:

The maximum width is the initial width of preview container.
The maximum height is the initial height of preview container.
If you set an aspectRatio option, be sure to set the preview container with the same aspect ratio.

strict

Type: Boolean
Default: true

In strict mode, the canvas (image wrapper) cannot be smaller than the container, and the crop box cannot be outside of the canvas (image wrapper).

responsive

Type: Boolean
Default: true

Rebuild the cropper when resize the window.

checkImageOrigin

Type: Boolean
Default: true

By default, the plugin will check the image origin, and if it is a cross-origin image, a crossOrigin attribute will be added to the image element and a timestamp will be added to the image url to reload the image for “getCroppedCanvas”.

By adding crossOrigin attribute to image will stop adding timestamp to image url, and stop reload of image.

modal

Type: Boolean
Default: true

Show the black modal above the image and under the crop box.

guides

Type: Boolean
Default: true

Show the dashed lines above the crop box.

center

Type: Boolean
Default: true

Show the center indicator above the crop box.

highlight

Type: Boolean
Default: true

Show the white modal above the crop box (highlight the crop box).

background

Type: Boolean
Default: true

Show the grid background of the container.

autoCrop

Type: Boolean
Default: true

Enable to crop the image automatically when initialize.

autoCropArea

Type: Number
Default: 0.8 (80% of the image)

A number between 0 and 1. Define the automatic cropping area size (percentage).

dragCrop

Type: Boolean
Default: true

Enable to remove the current crop box and create a new one by dragging over the image.

movable

Type: Boolean
Default: true

Enable to move the image.

rotatable

Type: Boolean
Default: true

Enable to rotate the image.

zoomable

Type: Boolean
Default: true

Enable to zoom the image.

mouseWheelZoom

Type: Boolean
Default: true

Enable to zoom the image by wheeling mouse.

wheelZoomRatio

Type: Number
Default: 0.1

Define zoom ratio when zoom the image by wheeling mouse.

touchDragZoom

Type: Boolean
Default: true

Enable to zoom the image by dragging touch.

cropBoxMovable

Type: Boolean
Default: true

Enable to move the crop box.

cropBoxResizable

Type: Boolean
Default: true

Enable to resize the crop box.

doubleClickToggle

Type: Boolean
Default: true

Enable to toggle drag mode between “crop” and “move” when double click on the cropper.

minContainerWidth

Type: Number
Default: 200

The minimum width of the container.

minContainerHeight

Type: Number
Default: 100

The minimum height of the container.

minCanvasWidth

Type: Number
Default: 0

The minimum width of the canvas (image wrapper).

minCanvasHeight

Type: Number
Default: 0

The minimum height of the canvas (image wrapper).

minCropBoxWidth

Type: Number
Default: 0

The minimum width of the crop box.

minCropBoxHeight

Type: Number
Default: 0

The minimum height of the crop box.

build

Type: Function
Default: null

A shortcut of the “build.cropper” event.

built

Type: Function
Default: null

A shortcut of the “built.cropper” event.

cropstart

Type: Function
Default: null

A shortcut of the “cropstart.cropper” event.

cropmove

Type: Function
Default: null

A shortcut of the “cropmove.cropper” event.

cropend

Type: Function
Default: null

A shortcut of the “cropend.cropper” event.

crop

Type: Function
Default: null

A shortcut of the “crop.cropper” event.

zoom

Type: Function
Default: null

A shortcut of the “zoom.cropper” event.

Methods

As there is an asynchronous process when load the image, you should call most of the methods after built, except “setAspectRatio”, “replace” and “destroy”.

$().cropper({
  built: function () {
    $().cropper('method', argument1, , argument2, ..., argumentN);
  }
});

crop()

Show the crop box manually.

$().cropper({
  autoCrop: false,
  built: function () {
    // Do something here
    // ...

    // And then
    $(this).cropper('crop');
  }
});

reset()

Reset the image and crop box to their initial states.

clear()

Clear the crop box.

replace(url)

url:
- Type: String
- A new image url.

Replace the image’s src and rebuild the cropper.

enable()

Enable (unfreeze) the cropper.

disable()

Disable (freeze) the cropper.

destroy()

Destroy the cropper and remove the instance from the image.

move(offsetX[, offsetY])

offsetX:
- Type: Number
- Default: 0
- Moving size (px) in the horizontal direction.
offsetY (optional):
- Type: Number
- Moving size (px) in the vertical direction.
- If not present, its defualt value is offsetX.

Move the canvas (image wrapper).

$().cropper('move', 1);
$().cropper('move', 1, 0);
$().cropper('move', 0, -1);

zoom(ratio)

ratio:
- Type: Number
- Zoom in: requires a positive number (ratio > 0)
- Zoom out: requires a negative number (ratio < 0)

Zoom the canvas (image wrapper).

$().cropper('zoom', 0.1);
$().cropper('zoom', -0.1);

rotate(degree)

degree:
- Type: Number
- Rotate right: requires a positive number (degree > 0)
- Rotate left: requires a negative number (degree < 0)

Rotate the canvas (image wrapper).

Requires CSS3 2D Transforms support (IE 9+).

$().cropper('rotate', 90);
$().cropper('rotate', -90);

scale(scaleX[, scaleY])

scaleX:
- Type: Number
- Default: 1
- The scaling factor to apply on the abscissa of the image.
- When equal to 1 it does nothing.
scaleY (optional):
- Type: Number
- The scaling factor to apply on the ordinate of the image.
- If not present, its defualt value is scaleX.

Scale the image.

Requires CSS3 2D Transforms support (IE 9+).

$().cropper('scale', -1); // Flip both horizontal and vertical
$().cropper('scale', -1, 1); // Flip horizontal
$().cropper('scale', 1, -1); // Flip vertical

getData([rounded])

rounded (optional):
- Type: Boolean
- Default: false
- Set true to get rounded values.
(return value):
- Type: Object
- Properties:
  - x: the offset left of the cropped area
  - y: the offset top of the cropped area
  - width: the width of the cropped area
  - height: the height of the cropped area
  - rotate: the rotated degrees of the image
  - scaleX: the scaling factor to apply on the abscissa of the image
  - scaleY: the scaling factor to apply on the ordinate of the image

Output the cropped area position and size data (base on the original image).

setData(data)

data:
- Type: Object
- Properties: See the getData method.

Change the cropped area position and size with new data (base on the original image).

Note: Only available in strict mode.

getContainerData()

(return value):
- Type: Object
- Properties:
  - width: the current width of the container
  - height: the current height of the container

Output the container size data.

getImageData()

(return value):
- Type: Object
- Properties:
  - left: the offset left of the image
  - top: the offset top of the image
  - width: the width of the image
  - height: the height of the image
  - naturalWidth: the natural width of the image
  - naturalHeight: the natural height of the image
  - aspectRatio: the aspect ratio of the image
  - rotate: the rotated degrees of the image if rotated
  - scaleX: the scaling factor to apply on the abscissa of the image if scaled
  - scaleY: the scaling factor to apply on the ordinate of the image if scaled

Output the image position, size and other related data.

getCanvasData()

(return value):
- Type: Object
- Properties:
  - left: the offset left of the canvas
  - top: the offset top of the canvas
  - width: the width of the canvas
  - height: the height of the canvas

Output the canvas (image wrapper) position and size data.

setCanvasData(data)

data:
- Type: Object
- Properties:
  - left: the new offset left of the canvas
  - top: the new offset top of the canvas
  - width: the new width of the canvas
  - height: the new height of the canvas

Change the canvas (image wrapper) position and size with new data.

getCropBoxData()

(return value):
- Type: Object
- Properties:
  - left: the offset left of the crop box
  - top: the offset top of the crop box
  - width: the width of the crop box
  - height: the height of the crop box

Output the crop box position and size data.

setCropBoxData(data)

data:
- Type: Object
- Properties:
  - left: the new offset left of the crop box
  - top: the new offset top of the crop box
  - width: the new width of the crop box
  - height: the new height of the crop box

Change the crop box position and size with new data.

getCroppedCanvas([options])

options (optional):
- Type: Object
- Properties:
  - width: the destination width of the output canvas
  - height: the destination height of the output canvas
  - fillColor: a color to fill any alpha values in the output canvas
(return value):
- Type: HTMLCanvasElement
- A canvas drawn the cropped image.
Browser support:
- Basic image: requires Canvas support (IE 9+).
- Rotated image: requires CSS3 2D Transforms support (IE 9+).
- Cross-origin image: requires HTML5 CORS settings attributes support (IE 11+).

Get a canvas drawn the cropped image.

After then, you can display the canvas as an image directly, or use canvas.toDataURL to get a Data URL, or use canvas.toBlob to get a blob and upload it to server with FormData if the browser supports these APIs.

$().cropper('getCroppedCanvas');

$().cropper('getCroppedCanvas', {
  width: 160,
  height: 90
});

// Upload cropped image to server
$().cropper('getCroppedCanvas').toBlob(function (blob) {
  var formData = new FormData();

  formData.append('croppedImage', blob);

  $.ajax('/path/to/upload', {
    method: "POST",
    data: formData,
    processData: false,
    contentType: false,
    success: function () {
      console.log('Upload success');
    },
    error: function () {
      console.log('Upload error');
    }
  });
});

setAspectRatio(aspectRatio)

aspectRatio:
- Type: Number
- Requires a positive number.

Change the aspect ratio of the crop box.

setDragMode([mode])

mode (optional):
- Type: String
- Default: 'none'
- Options: 'none', 'crop', 'move'

Change the drag mode.

Tips: You can toggle the “crop” and “move” mode by double click on the cropper.

Events

build.cropper

This event fires when a cropper instance starts to load an image.

built.cropper

This event fires when a cropper instance has built completely.

cropstart.cropper

event.originalEvent:
- Type: Event
- Options: mousedown, touchstart and pointerdown
event.action:
- Type: String
- Options:
  - 'crop': create a new crop box
  - 'move': move the canvas (image wrapper)
  - 'zoom': zoom in / out the canvas (image wrapper) by touch.
  - 'e': resize the east side of the crop box
  - 'w': resize the west side of the crop box
  - 's': resize the south side of the crop box
  - 'n': resize the north side of the crop box
  - 'se': resize the southeast side of the crop box
  - 'sw': resize the southwest side of the crop box
  - 'ne': resize the northeast side of the crop box
  - 'nw': resize the northwest side of the crop box
  - 'all': move the crop box (all directions)

This event fires when the canvas (image wrapper) or the crop box starts to change.

$().on('cropstart.cropper', function (e) {
  console.log(e.type); // cropstart
  console.log(e.namespace); // cropper
  console.log(e.action); // ...
  console.log(e.originalEvent.pageX);

  // Prevent to start cropping, moving, etc if necessary
  if (e.action === 'crop') {
    e.preventDefault();
  }
});

cropmove.cropper

event.originalEvent:
- Type: Event
- Options: mousemove, touchmove and pointermove.
event.action: the same as “cropstart.cropper”.

This event fires when the canvas (image wrapper) or the crop box is changing.

cropend.cropper

event.originalEvent:
- Type: Event
- Options: mouseup, touchend, touchcancel, pointerup and pointercancel.
event.action: the same as “cropstart.cropper”.

This event fires when the canvas (image wrapper) or the crop box stops to change.

crop.cropper

event.x
event.y
event.width
event.height
event.rotate
event.scaleX
event.scaleY

About these properies, see the getData method.

This event fires when the canvas (image wrapper) or the crop box changed.

zoom.cropper

event.originalEvent:
- Type: Event
- Options: wheel, touchmove.
event.ratio:
- Type: Number
- The current zoom ratio (ratio > 0 means zoom in, ratio < 0 means zoom out)

This event fires when a cropper instance starts to zoom in or zoom out its canvas (image wrapper).

$().on('zoom.cropper', function (e) {
  var maxRatio = 10;
  var imageData = $(this).cropper('getImageData');
  var currentRatio = imageData.width / imageData.naturalWidth;

  // Zoom in
  if (e.ratio > 0 && currentRatio > maxRatio) {

    // Prevent zoom in
    e.preventDefault();

    // Fit the max zoom ratio
    $(this).cropper('setCanvasData', {
      width: imageData.naturalWidth * maxRatio
    });
  }

  // Zoom out
  // ...
});

No conflict

If you have to use other plugin with the same namespace, just call the $.fn.cropper.noConflict method to revert to it.

<script src="other-plugin.js"></script>
<script src="cropper.js"></script>
<script>
  $.fn.cropper.noConflict();
  // Code that uses other plugin's "$().cropper" can follow here.
</script>

Browser support

Chrome (latest 2)
Firefox (latest 2)
Internet Explorer 8+
Opera (latest 2)
Safari (latest 2)

As a jQuery plugin, you also need to see the jQuery Browser Support.

Related projects

react-cropper – Cropper as React components.
ngCropper – AngularJS wrapper for Cropper.
ember-cli-cropper – Ember cli addon for Cropper.
ember-cli-image-cropper – Ember-cli addon for cropping/resizing images based on the jQuery Cropper plugin.

主页：http://fengyuanchen.github.io/cropper/

下载：cropper-master

项目地址：https://github.com/fengyuanchen/cropper

更多参考:

Linux中如何使用gThumb批量调整图片大小

Bootstrap 3 : 图片上传预览 image upload preview

jQuery Zoom 图片聚焦或者点击放大A plugin to enlarge images on touch, click, or mouseover

图片裁剪：CropZoom插件的应用

jquery 特效专辑

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