vuejs-clipper

Vue.js image clipping components using Vue-Rx.

• Add image clipping components to your Vue application in nothing flat.
• Touch devices supported and fully responsive.

Demo/Document

You can find the source code of examples under the examples branch.

• Live demo & examples
• Quick Start
• Try it on codepen
• README
• vuejs-clipper wiki

Table of Contents

• Notice
• Installation (NPM & ESM)
• Installation (Script)
• Components
• Changelog

Notice

Before using the plugin & components, here's something you should know:

• It's based on vue-rx.
• rxjs and vue-rx are required as peer dependencies.
• Components are responsive base on width instead of height, see Component Layout.
• You can clip your images (local uploaded images or images served on your site), but you cannot clip a cross-origin image unless the image server sets the CORS headers.
• Components' input is an image URL, output is a canvas element, they only help you clip images to canvas, you need to handle other things like transform file input to image URL or transform output canvas to image by yourself.
• If you set the clipper to be responsive, for example: put it in a Row, Col system or set its width based on the container's width, you will lose a little bit of precision. The result of the clipper and the clip box position might not be that accurate. If you cannot tolerate the slippage, use fixed width ${width + border*2}px on the clipper component like width: 502px.

Installation (NPM & ESM)

Install vuejs-clipper

npm install vuejs-clipper --save

Install peer dependencies if you haven't.

npm install vue-rx rxjs --save

Vuejs-clipper is based on vue-rx, so make sure you have the vue-rx plugin installed.

import Vue from 'vue'
import VueRx from 'vue-rx'
// install vue-rx
Vue.use(VueRx)

Make sure to install vue-rx plugin first.

Import

use dist files (Recommanded)

import Vue from 'vue'
import VueRx from 'vue-rx'
// Use build files
import VuejsClipper from 'vuejs-clipper/dist/vuejs-clipper.umd.min'
import 'vuejs-clipper/dist/vuejs-clipper.css'

Vue.use(VueRx)
Vue.use(VuejsClipper)

use vuejs-clipper soruce

Not Recommanded, through this way you need to make sure your project' sass and sass-loader version is supported

You are using vuejs-clipper directly with your build process(webpack etc).

So make sure you have css loader, ex: sass-loader if you haven't installed :

vuejs-clipper@4 only support sass (not node-sass) for this approach

npm install -D sass-loader sass

import Vue from 'vue'
import VueRx from 'vue-rx'
import VuejsClipper from 'vuejs-clipper'
// install vue-rx
Vue.use(VueRx)
// install vuejs-clipper
Vue.use(VuejsClipper)

Config

By default vuejs-clipper plugin will register all components to Vue global scope.

register some components to global with default component name

Vue.use(VuejsClipper, {
  components: {
    clipperBasic: true,
    clipperPreview: true
  }
})

with the customized component name

Vue.use(VuejsClipper, {
  components: {
    clipperBasic: 'image-clipper-basic',
    clipperPreview: 'my-preview'
  }
})

not register any components, but with some plugin options

Vue.use(VuejsClipper, {
  components: null,
  parentPropName: 'myCustomerName'
  /*
   parentPropName:
    Vuejs-clipper Adds property to Vue instance in order to store `clipper-preview` list.
    You can change the property name
    default: '_imgPreviewLists'
  */
})

separately import components (need css loader)

import Vue from 'vue'
import VueRx from 'vue-rx'
// install vue-rx
Vue.use(VueRx)

then import in your components (SFC)

import { clipperBasic, clipperPreview } from 'vuejs-clipper'

export default {
  components: {
    clipperBasic,
    clipperPreview
  }
}

Installation (Script)

Include vuejs-clipper umd script after Vue.js.

<!-- rxjs-->
<script src="https://unpkg.com/rxjs/bundles/rxjs.umd.js"></script>
<!--vue-->
<script src="https://cdn.jsdelivr.net/npm/vue@2.5.17/dist/vue.js"></script>
<!-- vue-rx-->
<script src="https://unpkg.com/vue-rx@6.2.0/dist/vue-rx.js"></script>
<!--vuejs-clipper script & style -->
<script src="./dist/vuejs-clipper.umd.min.js"></script>
<link rel="stylesheet" href="./dist/vuejs-clipper.css" />

Use in html/template

<clipper-basic src="example.jpg"></clipper-basic>

Components

• clipperBasic
• clipperFixed
• clipperPreview
• clipperUpload
• clipperRange

See detail examples.

clipper-basic

an image clipping component

import { clipperBasic } from 'vuejs-clipper'

• Props

Prop	Type	default	description
src	string		image src
preview	string		matches clipper-preview's name to show preview image.
border	number	1	border width
outline	number	6	outlines near by the border to help user zooming.
corner	boolean	true	show corner layout
grid	boolean	true	show grid layout
ratio	number		ratio of clipping area (width/height). ex: 1, 4/3 .
wrap-ratio	number	NaN	ratio of clipping container (width/height). ex: 1, 4/3 .
mode	'normal'/'switch'	'normal'	if ratio is set, this prop will affect how clipping area zoom.
bg-color	string	'white'	background color
lineColor	string	'#1baae8'	clip box line color
shadow	string	'rgba(0,0,0,0.4)'	shadow color
rotate	number	0	rotate degree
scale	number	1	transform scale
min-width	number	1	minimum width(%) of clipping box related to clipping component's width
min-height	number	1	minimum height(%) of clipping box related to clipping component's height.
init-width	number	50	clipping area's width(%) when the image loaded.
init-height	number	50	clipping area's height(%) when the image loaded.
touch-create	boolean	true	enable/disable create new clipping area on touch device
cross-origin	string	undefined	crossorigin attribute of <img /> inside clipper. ex: anonymous

For more detail about the layout settings, pleases see Component layout in depth.

• Methods

method	argument	return	description
clip	options	canvas element	get clipping canvas element
getDrawPos		{pos, translate}: positions and transformation	get result canvas information

clip() arguments

Resulting-canvas-size

name	type	default	description
options.wPixel	number	undefined	Set the the width (pixel) of result canvas.
options.maxWPixel	number	undefined	Set the the maximum width (pixel) of result canvas.

set ref to use component methods

<clipper-basic ref="clipper" />

in your Vue instance methods

const canvas = this.$refs.clipper.clip()

• Event

event	parameters	description
load	$event	image onload
error	$error	image onerror

usage :

<clipper-basic @error="errorCb" @load="loadCb" />

• Data

data	type	default	description
imgRatio	number	NaN	upload image's ratio (image naturalWidth/natrualHeight). Default value is NaN, after the load event the value will be set.
zoomTL$	object		clipping area's position(%), can be top/bottom and left/right.
zoomWH$	object		clipping area's width and height(%)

usage :

this.$refs.clipper.imgRatio
this.$refs.clipper.zoomWH$.width

• Slot

slot	description
placeholder	if no src provided, show placeholder

<clipper-basic src="">
  <div slot="placeholder">No image</div>
</clipper-basic>

• rxjs Subject

subject	description
setTL$	Set the position of the zooming area.
setWH$	Set the width and height of the zooming area.
onChange$	Subject that subscribes to zooming, moving, and rotating subjects.

usage:

this.$refs.clipper.setTL$.next({ left: 0, top: 0 }) // percentage 0%
this.$refs.clipper.setTL$.next({ right: 0, bottom: 10 })
this.$refs.clipper.setWH$.next({ width: 100, height: 100 }) // percentage 100%

this.$refs.clipper.onChange$.subscribe(() => {
  // This happens whenever zooming, moving, and rotating occur.
})

clipper-fixed

an image clipping component

import { clipperFixed } from 'vuejs-clipper'

• Props

Prop	Type	default	description
src	string		image src
preview	string		matches clipper-preview's name to show preview image.
ratio	number	1	ratio of clipping area (width/height). ex: 1, 4/3 .
zoom-rate	number	0.04	zooming faster if this value is larger
min-scale	number	0.1	minimum transform scale
border	number	1	border width
border-color	string	'white'	border color
grid	boolean	true	show grid layout
round	boolean	false	Use a round clipping area, this only effect the component layout, also affect clipping results.
bg-color	string	'white'	background color
shadow	string	'rgba(0,0,0,0.4)'	shadow color
rotate	number	0	rotate degree
area	number	50	width or height (%) of clipping box(depends on ratio).
cross-origin	string	undefined	crossorigin attribute of <img /> inside clipper. ex: anonymous
handle-zoom-event	function	(scale) => scale	handle zooming, accept the calculated scale value, return the scale value.

• Method

method	argument	return	description
clip	options	canvas element	get clipping canvas element.
getDrawPos		{pos, translate}: positions and transformation	get result canvas information

clip() arguments

name	type	default	description
options.wPixel	number	undefined	Set the the width (pixel) of result canvas.
options.maxWPixel	number	undefined	Set the the maximum width (pixel) of result canvas.

• Event

event	parameters	description
load	$event	image onload
error	$error	image onerror

• Data

data	type	default	description
imgRatio	number	NaN	upload image's ratio (image naturalWidth/natrualHeight). Default value is NaN, after the load event the value will be set.
bgTL$	object		image's translate(X,Y)
bgWH$	number		image's scaling

• Slot

slot	description
placeholder	if no src provided, show placeholder

• rxjs Subject

subject	description
setTL$	Set the top and left of the image.
setWH$	Set the sizing(scaling) of the image.
onChange$	Subject that subscribes to zooming, moving, and rotating subjects.

usage:

this.$refs.clipper.setTL$.next({ left: 50, top: 50 }) // percentage 0%
this.$refs.clipper.setWH$.next(0.6) // transform scale(0.6)

this.$refs.clipper.onChange$.subscribe(() => {
  // This happens whenever zooming, moving, and rotating occur.
})

clipper-preview

preview clipping result

import { clipperPreview } from 'vuejs-clipper'

• Props

Prop	Type	default	description
name	string		name that matches clipper component's preview property

• Slot

slot	description
placeholder	if no src provided, show placeholder

clipper-range

a simple input range component

import { clipperRange } from 'vuejs-clipper'

use v-model binding data with clipper-range

• Props

Prop	Type	default	description
max	number	10	maximum value of range
min	number	0	minimum value of range

clipper-upload

a new component in 0.2.0

an upload button that transforms image files to URL

import { clipperUpload } from 'vuejs-clipper'

use v-model binding data with clipper-upload

• Props

Props that are not defined below will apply to the file input as attributes, for example: accept, id, and name.

Prop	Type	default	description
check	boolean	true	Check if upload file is an image. If set to true, when upload files that are not images, it will do nothing, so you will not get an error event on the clipping component.
exif	boolean	true	Transform EXIF image to correct orientation when uploading.

• Event

event	parameters	description
input	$event	Result domgstring on change

• Data

data	type	default	description
file	File Object	null	Uploaded file's original File Object.

Changelog

• 4.1.0

  • clipper-fixed: if prop round is true, result image will clip in rounded background #119.

• 4.0.0

  • Use dart-sass instead of node-sass.
  • update sass syntax: use math.div instead of /

---

• 3.2.0

  • [Deprecated] should be 4.0.0

• 3.1.2

  • Fix touch devices zooming bug: #91

• 3.1.1

  • Fix #82

• 3.1.0

  • Fix clipper-basic ratio is not correct.

!Before v3.1.0, clipper-basic with ratio prop has a bug that the clip area is not calculated correctly with border prop, so the ratio of the clipping result isn't precise. (issue #80)

• 3.0.4
  • clipper-upload accept rest props as input attributes.
• 3.0.3
  • Feature: Add handleZoomEvent to clipper-fixed for controlling zoom behavior. (issue #54
• 3.0.2
  • Fix: move clipper-basic init/reset position function into $nextTick (issue #71)
• 3.0.1
  • Fix clipper-basic initalize ratio clip-box & wrong border layout.
• 3.0.0
  • Move rxjs, vue-rx from dependencies to peer dependencies.

---

• 2.1.2
  • Fix clipper-basic incorrect layout for scaling & rotation (bug of 2.1.1).
• 2.1.1
  • Fix clipper-basic incorrect layout for verticle images on Firefox.
• 2.1.0
  • Fix broken wrap-ratio.
• 2.0.0
  • Change css naming to BEM.

---

• 1.1.6
  • Update dependencies.
• 1.1.5
  • Add new prop area for clipper-fixed.
• 1.1.4
  • Add crossorigin attribute biding for <img/> in clipper (crossOrigin prop).
• 1.1.3
  • Add !important statements to components' style.
• 1.1.2
  • Set pixel of clip result canvas. clip({ wPixel, maxWPixel })
• 1.1.1
  • Add clipper-fixed placeholder slot.
• 1.1.0
  • Fixed clipper-basic props ratio and wrapRatio behaviors, now ratio will not affect clipper's layout since there's wrapRatio to control the layout.
• 1.0.1
  • Fixed clipper-fixed loading images overflow.
  • Add wrapRatio, initWidth and initHeight props to clipper-basic
• 1.0.0
  • Change the clipper-basic design, it will judge layout depends on the ratio.
  • Production version.

---

• 0.2.13
  • Decrease css specificity
• 0.2.12
  • Fixed issue #13
• 0.2.11
  • Expose rxjs subjects that can set position and layout of the movable area.
• 0.2.10
  • Use passive event listener on wheel event (issue #8).
• 0.2.9
  • New prop border-color for clipper-fixed
  • Fixed issue #4
• 0.2.8
  • New prop accept for clipper-upload (issue #1)
  • Add EXIF image transformation feature to clipper-upload (issue #2)