README.md

Redraw

Canvas + JSX + Hooks

View on CodePen

⚠️ Please note that this still is a work in progress ️️️⚠️

Getting started

Install Redraw:

npm i @jchn/redraw

Configure Babel

You can use JSX to create your views, to do this you need to configure babel to use Redraw's createElement function.

Drawing a rectangle on the canvas

import { render, createElement as h } from '@jchn/redraw'

/* @jsx h */

const view = (
  <rectangle x={10} y={10} width={50} height={50} />
)

// obtain the CanvasRenderContext2D object
const ctx = document.querySelector('canvas').getContext('2d')

// mount the application by passing the view and the context to Redraw's render function
render(ctx, view)

Components

You can create your own components by creating functions:

const MyRectangle = ({ x, y, width, height, children }) => {
  return (
    <rectangle x={x} y={y} width={width} height={height}>
      {children}
    </rectangle>
  )
}

Events

You can add events to elements by using props like onClick:

const view = (
  <rectangle x={10} y={10} width={50} height={50} onClick={e => {
    console.log('click!')
  }} />
)

Note: not alle events are yet supported

Hooks

Currently you can only use the useState hook, more hooks to come!

import { useState } from '@jchn/redraw'

const MyRectangle = ({ x, y, width, height, children }) => {

  const [count, setCount] = useState(0)

  return (
    <rectangle x={x} y={y} width={width} height={height} onClick={() => {
      setCounter(count + 1)
    }}>
      clicked {count} times!
    </rectangle>
  )
}