React-wasm-canvas NPM

react-wasm-canvas

Install

npm install --save react-wasm-canvas

Intro

WasmCanvas is a functional component that helps you render a webGL (1,2) context coming from a WebAssembly module into a canvas. It uses async loading through axios and keeps all the logic in sync using a store provider, in my case I use reactn which I much prefer over redux, but you can use your own.

Breaking changes since version 2.0.0

Just scroll down to see the new example, I've removed redux dependency, so you can now use your own store.

How it works

Usually you will have your wasm module (a pair of wasm and js files) somewhere around your public folder of your website, IE:

public/editor.wasm
public/editor.js

WasmCanvas will load editor module from public using axios asynchronously. It will take the father element canvasContainer as ref, that will be used internally to calculate all sizes and scaling. InitialRect and initialVisibility are used to determine those start values in case use pass a null dispatcher, declared later.

<WasmCanvas
    wasmName='editor'
    canvasContainer={fatherRef.current}
    initialRect={{top: 0, left: 0, width: 0, height: 0}}
    initialVisibility={false}
/>

WasmCanvas supports dynamic resizing and devices pixel ratio (IE retina's display) out of the box and transparently.

`WasmCanvas` parameters list

All optional:

dispatcher // I use ReactN instead of Redux but you can use what you want as long as they adhere to the pair of [state, setState] idiom
argumentList // Array of Arguments for wasm module argv argc, array
padding // canvas padding
borderRadius // canvas radius
preFilter // specify your folder if your wasm is not in public/
mandatoryWebGLVersionSupporNumber // Require a mandatory webgl version "webgl" or "weblgl2"

Usage

import React from 'react'
import WasmCanvas from 'react-wasm-canvas'

// I use reactn (which is awesome) but you can use what you want, as long as they return a [state,setState] pair.
import {useGlobal} from "reactn";

const App = () => {
  const wasmDispatcher = useGlobal('reactWasm');
  let canvasContainer = React.useRef(null);

  const wasmArgumentList = []

  return (
      <div ref={canvasContainer}>
        <WasmCanvas
          wasmName="editor"
          dispatcher={wasmDispatcher}
          canvasContainer={canvasContainer.current}
          initialRect={{top: 0, left: 0, width: 200, height: 200}}
          initialVisibility={true}
          argumentList={wasmArgumentList}
          padding="1px"
          borderRadius="5px"
          mandatoryWebGLVersionSupporNumber="webgl2"
        />
      </div>
  )
}

export default App