React-image-label NPM

A comprehensive component for tagging images. Check out demo 1 and demo 2 for some examples.

Features

Bounding Box (Rectangle, Square, Circle, and Ellipse), and Polygon Annotations
Add, Edit, Drag, Rotate, and Delete Annotations
Zoom and Pan
Changing image on the fly
Colorful annotations
Raw or typed input/output

Screenshot of ImageAnnotator

Usage

Install react-image-label using npm.

npm install react-image-label

Then you can just import the component and its hook:

import { ImageAnnotator, useImageAnnotator } from 'react-image-label';

and use it as below:

const { setHandles, annotator } = useImageAnnotator();

<ImageAnnotator
  setHandles={setHandles}
  naturalSize={true}
  imageUrl={'your-image-url'}  
  shortcut={{del: true, bksp: true }}
  onReady={annotator => { annotator.drawRectangle() }} />

Now you can draw rectangles on the image by dragging the left mouse button.

Mouse and Keyboard events

click: Edit/Stop Edit Annotations
Ctrl + mouse wheel: Zoom
Ctrl + mouse drag: Pan
mouse drag: Drag/Edit/Rotate Annotations

when using shortcut={{del: true, bksp: true }} in props (see Shortcut Settings):

Delete/Backspace key: Delete Annotations

Props

The following props can be defined on ImageAnnotator:

Prop	Type	Description	Default
`imageUrl` *	`string`	Use a state for image url if you want to change it on the fly
`shapes`	`Shape[] \\| any[]`	Annotations being displayed on load (see shapes)
`naturalSize`	`boolean`	To show image in its natural size	`false`
`width`	`number`	`container` width	`image.naturalWidth`
`height`	`number`	`container` height	`image.naturalHeight`
`discRadius`	`number`	The radius of the green discs in edit mode	5
`hideBorder`	`boolean`	To hide annotation border	`false`
`shortcut`	`Shortcut`	To configure shortcuts (see Shortcut Settings)
`onAdded`	`Shape => any`	When an annotation is drawn (see Annotations with Categories)
`onEdited`	`Shape => any`	When an annotation is reshaped, dragged, or rotated
`onSelected`	`Shape => any`	When an annotation goes into edit mode by double-clicking
`onContextMenu`	`Shape => any`	When an annotation is right-clicked (see Annotations with Categories)
`onReady`	`AnnotatorHandles => any`	When the component is mounted

(*) required props

Handles

You can access the handles using the annotator object as follows:

<button onClick={() => { annotator.drawCircle() }}>Draw Circle</button>

Below is a list of all handles:

Handle	Type	Description
`drawCircle`	`() => void`	Allows drawing circles by dragging the left mouse button
`drawEllipse`	`() => void`	Allows drawing ellipses by dragging the left mouse button
`drawRectangle`	`() => void`	Allows drawing rectangles by dragging the left mouse button (keep the shift key to draw square)
`drawPolygon`	`() => void`	Allows drawing polygons by clicking and double-clicking
`drawDot`	`() => void`	Allows adding dots (points) by clicking
`stop`	`() => void`	Stops draw/edit/drag mode
`edit`	`(id: number) => void`	The annotation identified by `id` can be edited and dragged
`delete`	`(id: number) => void`	Removes the annotation identified by `id`
`stopEdit`	`() => void`	Stops editing and dragging
`updateCategories`	`(id: number, categories: string[], color?: string) => void`	Updates the categories associated with the annotation identified by `id`
`zoom`	`(factor: number) => void`	Multiplies the dimensions by `factor`
`getShapes`	`() => Shape[]`	Gets all annotations (shapes)
`container`	`HTMLDivElement`	The `div` wrapping the `SVG`

Annotations with Categories

To attach one or more categories to an annotation, utilize onAdded and onContextMenu props being called when an annotation is drawn and right-clicked, respectively. Use shape.categories to get the previous categories as string[]:

const showCategoriesDialog = (shape) => {
  console.log(shape.id) // 1
  console.log(shape.getCenterWithOffset()) // { X: 247.5, Y: 193 }
  console.log(shape.categories) // string []
  // Show a category selection component
}

return (
  <ImageAnnotator
    onAdded={showCategoriesDialog}
    onContextMenu={showCategoriesDialog}
    ...
);

Finally, call annotator.updateCategories to update the categories of the annotation.

Shapes

The data models for all shapes are listed below:

Shape	Data Model	`type` Value
`Circle`	`{ id: number, centre: [number, number], radius: number, categories: string[], type: string, color: string }`	circle
`Ellipse`	`{ id: number, centre: [number, number], radiusX: number, radiusY: number, phi: number, categories: string[], type: string, color: string }`	ellipse
`Rectangle`	`{ id: number, points: [number, number][], phi: number, categories: string[], type: string, color: string }`	rectangle
`Polygon`	`{ id: number, points: [number, number][], categories: string[], type: string, color: string }`	polygon
`Dot`	`{ id: number, position: [number, number], categories: string[], type: string, color: string }`	dot

Shortcut Settings

Below is a list of shortcuts that are configured through shortcut prop:

Key	Type	Description	Default
`del`	boolean	To enable the Delete key to remove the annotation that is in edit mode	`false`
`bksp`	boolean	To enable the Backspace key to remove the annotation that is in edit mode	`false`

Contributing

Fork the project.
Make changes.
Run the project in development mode: npm run ladle.
Write your own tests and/or update existing ones in src/test dir.
Check the new features and changes using annotator.stories.tsx or your own Stories (*.stories.tsx).
Update README with appropriate docs.
Commit and PR

Dependencies

The package is dependent on SVG.js through react-svgdotjs package. The following peer dependencies must be specified by your project in order to avoid version conflicts: react, react-dom. NPM will not automatically install these for you but it will show you a warning message with instructions on how to install them.