react-xarrows

⚠️Warning⚠️

I’m no longer maintaining this project, as evident from the commit history. It Started 5 years ago due to a lack of good React libraries for SVG arrows/lines, but better alternatives exist today, like react-flow (unrelated to me). react-xarrows v3 is 75% ready in my stash, but I won’t work on it for now due to other projects.

Thanks for the journey, happy development!

introduction

Draw arrows between components in React!

npm version downloads issues licence

Main features

liked my work? star this repo.

reallyy liked my work? buy me a coffee!

Help wanted

This project needs another maintainer, especially for known bugs(and future ones) of react-xarrows v2. I’m working on V3 from time to time, but don’t have the time to respond and fix all active issues. help would be welcomed(contact me on louski.a@gmail.com for more details)

installation

with npm npm install react-xarrows. (or yarn add react-xarrows)

Examples

Demos

see here! codebox of few examples(in this repo at /examples).

react-xarrow-picture-1 4 2

see this interactive example: https://lwwwp.csb.app/CustomizeArrow

simple example:

import React, {useRef} from "react";
import Xarrow from "react-xarrows";

const boxStyle = {border: "grey solid 2px", borderRadius: "10px", padding: "5px"};

function SimpleExample() {
    const box1Ref = useRef(null);
    return (
        <div style=>
            <div ref={box1Ref} style={boxStyle}>hey</div>
            <p id="elem2" style={boxStyle}>hey2</p>
            <Xarrow
                start={box1Ref} //can be react ref
                end="elem2" //or an id
            />
        </div>
    );
}

export default SimpleExample;

V2 example

in order to invoke updates on xarrows wrap your arrows and connceted elements with Xwrapper, and consume useXarrow on connected elements.

import React from 'react';
import Xarrow, {useXarrow, Xwrapper} from 'react-xarrows';
import Draggable from 'react-draggable';

const boxStyle = {border: 'grey solid 2px', borderRadius: '10px', padding: '5px'};

const DraggableBox = ({id}) => {
    const updateXarrow = useXarrow();
    return (
        <Draggable onDrag={updateXarrow} onStop={updateXarrow}>
            <div id={id} style={boxStyle}>
                {id}
            </div>
        </Draggable>
    );
};

export function V2Example() {
    return (
        <div style=>
            <Xwrapper>
                <DraggableBox id={'elem1'}/>
                <DraggableBox id={'elem2'}/>
                <Xarrow start={'elem1'} end="elem2"/>
            </Xwrapper>
        </div>
    );
}
another example 
import React from 'react';
import Xarrow, {useXarrow, xarrowPropsType, Xwrapper} from 'react-xarrows';
import Draggable from 'react-draggable';

const boxStyle = {
    border: '1px #999 solid',
    borderRadius: '10px',
    textAlign: 'center',
    width: '100px',
    height: '30px',
    color: 'black',
    alignItems: 'center',
    display: 'flex',
    justifyContent: 'center',
} as const;

const canvasStyle = {
    width: '100%',
    height: '100vh',
    background: 'white',
    overflow: 'auto',
    display: 'flex',
    color: 'black',
} as const;

const DraggableBox = ({box}) => {
    const updateXarrow = useXarrow();
    return (
        <Draggable onDrag={updateXarrow} onStop={updateXarrow}>
            <div id={box.id} style=>
                {box.id}
            </div>
        </Draggable>
    );
};

const SimpleTemplate = () => {
    const box = {id: 'box1', x: 20, y: 20};
    const box2 = {id: 'box2', x: 320, y: 120};
    const box3 = {id: 'box3', x: 50, y: 150};
    const box4 = {id: 'box4', x: 320, y: 220};
    return (
        <div style={canvasStyle} id="canvas">
            <Xwrapper>
                <DraggableBox box={box}/>
                <DraggableBox box={box2}/>
                <Xarrow start={'box1'} end={'box2'}/>
                <Xarrow start={'box1'} end={'box2'} endAnchor={'top'}/>
                <Xarrow start={'box1'} end={'box2'} startAnchor={'bottom'}/>
            </Xwrapper>
            <Xwrapper>
                <DraggableBox box={box3}/>
                <DraggableBox box={box4}/>
                <Xarrow start={'box3'} end={'box4'}/>
            </Xwrapper>
        </div>
    );
};

(will render this)

Usage

react-xarrows will smartly trigger updates on relevant elements! use Xwrapper and useXarrow hook to achieve selective rendering!

useXarrow

import {useXarrow} from "react-xarrow"

const YourComponent = ({id, ...props}) => {
    const updateXarrow = useXarrow()
    //...
    return (
        <div id={id}>
            ...
        </div>
    )

}

Xwrapper

const YourApp = () => {
    return (
        // ...
        <Xwrapper>
            <YourComponent id={'comp1'}/>
            <YourComponent id={'comp2'}/>
            <Xarrow start={'comp1'} end={'comp2'}/>
        </Xwrapper>
        // ...
    )
}

each time component calling useXarrow hook renders also the xarrows inside the wrapping Xwrapper wrapper will render. receiving updateXarrow is optional. use this function only if you want to trigger a render different phase from rendering(like click or drag event).

API

to see full typescript definition see types.ts file.

here’s a summary of the all the available props:

Properties Description default value type
start ref to start element none(Required!) string/ReactRef
end ref to end element none(Required!) string/ReactRef
startAnchor from which side the arrow should start from start element ‘auto’ string/object/array
endAnchor at which side the arrow should end at end element ‘auto’ string/object/array
labels optional labels null string/array
color color of Xarrow(all parts) ‘CornflowerBlue’ string
lineColor color of the line null string
headColor color of the head null string
tailColor color of the tail null string
strokeWidth thickness of Xarrow(all parts) 4 number
headSize thickness of head(relative to strokeWidth) 6 number
tailSize thickness of tail(relative to strokeWidth) 6 number
path path drawing style ‘smooth’ string
curveness how much the line curveness when path=’smooth’ 0.8 number
gridBreak where the line breaks in path=’grid’ “50%” string
dashness should the line be dashed false boolean/object
showHead show the arrow head? true boolean
showTail show the arrow tail? false boolean
showXarrow show Xarrow? true boolean
animateDrawing animate drawing when arrow mounts? false boolean/object
headShape shape of the arrow head ‘arrow1’ string/object
tailShape shape of the arrow tail ‘arrow1’ string/object
zIndex zIndex - Overlapping elements with a larger z-index cover those with a smaller one 0 number
Advanced Props

see details

Properties Description default value type
passProps properties which will be pased to arrowBody,arrowHead,arrowTail {} object
SVGcanvasProps properties which will be passed to svgCanvas {} object
arrowBodyProps properties which will be passed to arrowBody {} object
arrowHeadProps properties which will be passed to arrowHead {} object
arrowTailProps properties which will be passed to arrowTail {} object
divContainerProps properties which will be passed to divContainer {} object
SVGcanvasStyle style properties which will be passed svgCanvas 0 object
divContainerStyle style properties which will be passed divContainer false object
_extendSVGcanvas extend svgCanas at all sides 0 number
_debug show debug elements 0 boolean
_cpx1Offset offset control point 1 x 0 number
_cpy1Offset offset control point 1 y 0 number
_cpx2Offset offset control point 2 x 0 number
_cpy2Offset offset control point 2 x 0 number
API flexibility

This API built in such way that most props can accept different types. you can keep things simple or provide more custom props for more custom behavior(see startAnchor good example).
explore typescript for detailed descriptions of what type excepts every prop.

Properties

This documentation is examples driven.
The examples sorted from the most common use case to the most custom one.

‘start’ and ‘end’

required\ can be a reference to a react ref to html element or string - an id of a DOM element.

examples:

‘startAnchor’ and ‘endAnchor’

specify what anchors are allowed. can be a string/object/array.

type:

export type anchorType = anchorPositionType | anchorCustomPositionType;

simple usage:

type:

export const tAnchorEdge = ['middle', 'left', 'right', 'top', 'bottom', 'auto'] as const;
export type anchorPositionType = typeof tAnchorEdge[number];

one of "auto" | "middle" | "left" | "right" | "top" | "bottom" auto will choose automatically the path with the smallest length.

example:

custom usage:

type:

export type anchorCustomPositionType = {
    position: anchorPositionType;
    offset: { x?: number; y?: number };
};

example:

if list is provided - the minimal length anchors will be chosen from the list. example:

labels

you can place up to 3 labels. see examples

color,lineColor and headColor and tailColor

color defines color to the entire arrow. lineColor,headColor and tailColor will override color specifically for line,tail or head. examples:

strokeWidth and headSize and tailSize

strokeWidth defines the thickness of the entire arrow. headSize and tailSize defines how big will be the head or tail relative to the strokeWidth. examples:

path

path can be one of: "smooth" | "grid" | "straight", and it controls the path arrow is drawn, exactly how their name suggest. examples:

curveness

defines how much the lines curve. makes a difference only in path='smooth'. examples:

gridBreak

defines where the line will break when path='grid'.

examples:

dashness

can make the arrow dashed and can even animate. if true default values(for dashness) are chosen. if object is passed then default values are chosen except what passed. examples:

showHead, showTail and showXarrow

showXarrow: show or not show Xarrow? (can be used to restart the drawing animation) showHead: show or not the arrow head? showTail: show or not the arrow tail?

animateDrawing

can animate the drawing of the arrow using svg animation. type: boolean|number. if true animation duration is 1s. if number is passed then animation duration is number’s value in seconds. examples:

custom svg arrows - headShape and tailShape

you can customize the svg edges (head or tail) of the arrow. you can use predefined svg by passing string,one of "arrow1" | "circle" | "heart"

simple usage:

headShape type:string

Code Result
```jsx ``` ![img_1.png](/react-xarrows/images/fillCircle.png)
```jsx <xarrow headShape='circle' arrowHeadProps={"fill": "transparent", "strokeWidth": "0.1", "stroke": "CornflowerBlue"} /> ``` ![img_1.png](/react-xarrows/images/emptyCircle.png)
```jsx ``` ![img.png](/react-xarrows/images/heart.png)

you can import arrowShapes which is object contains all predefined svg shapes.

custom usage

you can also pass your own svg shapes:

type svgElemType = "circle" | "ellipse" | "line" | "path" | "polygon" | "polyline" | "rect"
type headShapeType<T extends svgElemType> = {
    svgElem: SVGElementTagNameMap[T];
    offsetForward?: number;
};

for example, you can pass the following object, and it will be exactly equivalent to passing 'arrow1':

const headShapeArrow1 = {svgElem: <path d="M 0 0 L 1 0.5 L 0 1 L 0.25 0.5 z"/>, offsetForward: 0.25}
// then pass it Xarrow
<Xarrow headShape={headShapeArrow1}/>

svgElem - a jsx of svg element like path or circle(can also imported svg element from file).
offsetForward - how much to offset tht line into the svg element(from 0 to 1). normally the line will connect to the start of the svgElem. for example in case of the default arrow you want the line to enter 25% into the svgElem.

here’s a custom example using custom svg files.

don’t forget about arrowHeadProps and arrowTailProps in case you want to use default shape but custom svg props.

in case you pass a custom svg element: currently you have to adjust the path to start from 0,0 and to be at size box 1x1 in order to make the custom shape look like the default shapes in size.

advanced customization

passing props

The xarrow is fully customizable, and you can pass props to any part of the component. if unlisted(unknown) property is passed to xarrow so by default it’ll be passed down to divContainer.

passProps

you can pass properties to visible parts(body and head) of the arrow (such event handlers and much more). this supposed to be enough for most cases. examples:

advanced customization

The properties below can be used to customize the arrow even farther:

arrowBodyProps, arrowHeadProps, SVGcanvasProps, divContainerProps

image

if you wish you can pass props specific part of the component.

Note that arrowBody and arrowHead receives props of svg path element, SVGcanvas receives props of svg element, and divContainerProps of a div element.

examples:

SVGcanvasStyle, divContainerStyle

if you wish to pass style to divContainer or SVGcanvas use SVGcanvasStyle,divContainerStyle and not SVGcanvasProps ,divContainerProps to not override existing style.

_extendSVGcanvas

will extend the svg canvas at all sides. can be useful if for some reason the arrow is cut though to small svg canvas( should be used in advanced custom arrows). example: _extendSVGcanvas = {30} - will extend svg canvas in all sides by 30 pixels.

_cpx1Offset,_cpy1Offset,_cpx2Offset,_cpy2Offset

now you can manipulate and offset the control points of the arrow. this way you can control how the line curves. check out the interactive codesandbox, set _debug to true and play with these properties.

Donation

It takes many hours to develop and maintain this library, and it is not funded by any company or commercial organization.

If you/your company are using this project, please consider donating.
Any donation will help me to devote more time to the development of this project.

paypal

Contributing

Want a feature that is not supported? found a bug?
no need to clone the repo and set up the dev environment anymore!
here’s a ready to use development environment with a click of a button(patience, it takes about a minute to setup):

Open in Gitpod

this will set up environment that will clone react-xarrow master,and will link the code from the src to the examples, and will start examples,with typescript watch process that will recompile when any change is made.
this means that any code changes in src/* will immediately be reflected to the running example at port 3000! (add console.log(“test”) line and see!)
to reproduce this dev env on your local machine git clone and follow same commands as in gitpod.yml.

if you made an improvement that is relevant for most users, you can quickly submit a pull request.
Please always pull request from and into dev branch - here’s Gitpod

Versions

See CHANGELOG.md in this repo.