I'm going to use this wrapper example as a platform to learn p5 + ml5 in React.

Original README bellow

@P5-wrapper/react

A component to integrate P5.js sketches into React apps.

Demo & Examples

Live demo

A live demo can be viewed at P5-wrapper.github.io/react.

Examples

The repository contains further examples.

To try them out for yourself fork the repository, be sure you have PNPM installed and then run the following:

git clone git@github.com:<your username>/react.git
cd react
pnpm install
pnpm start

Then just open http://localhost:3001 in a browser.

Installation

NPM

  npm install react-p5-wrapper

PNPM

  pnpm add react-p5-wrapper

Yarn

  yarn add react-p5-wrapper

Usage

Javascript

import React from "react";
import { ReactP5Wrapper } from "react-p5-wrapper";

function sketch(p5) {
  p5.setup = () => p5.createCanvas(600, 400, p5.WEBGL);

  p5.draw = () => {
    p5.background(250);
    p5.normalMaterial();
    p5.push();
    p5.rotateZ(p5.frameCount * 0.01);
    p5.rotateX(p5.frameCount * 0.01);
    p5.rotateY(p5.frameCount * 0.01);
    p5.plane(100);
    p5.pop();
  };
}

export function App() {
  return <ReactP5Wrapper sketch={sketch} />;
}

TypeScript

TypeScript sketches can be declared in two different ways, below you will find two ways to declare a sketch, both examples do the exact same thing.

In short though, the ReactP5Wrapper component requires you to pass a sketch prop. The sketch prop is simply a function which takes a p5 instance as it's first and only argument.

Option 1: Declaring a sketch using the `P5CanvasInstance` type

import React from "react";
import { P5CanvasInstance, ReactP5Wrapper } from "react-p5-wrapper";

function sketch(p5: P5CanvasInstance) {
  p5.setup = () => p5.createCanvas(600, 400, p5.WEBGL);

  p5.draw = () => {
    p5.background(250);
    p5.normalMaterial();
    p5.push();
    p5.rotateZ(p5.frameCount * 0.01);
    p5.rotateX(p5.frameCount * 0.01);
    p5.rotateY(p5.frameCount * 0.01);
    p5.plane(100);
    p5.pop();
  };
}

export function App() {
  return <ReactP5Wrapper sketch={sketch} />;
}

Option 2: Declaring a sketch using the `Sketch` type

Using the Sketch type has one nice benefit over using P5CanvasInstance and that is that the p5 argument passed to the sketch function is auto-typed as a P5CanvasInstance for you.

Sidenote:

In general it comes down to personal preference as to how you declare your sketches and there is nothing wrong with using the P5CanvasInstance manually in a regular function declaration.

import React from "react";
import { ReactP5Wrapper, Sketch } from "react-p5-wrapper";

const sketch: Sketch = p5 => {
  p5.setup = () => p5.createCanvas(600, 400, p5.WEBGL);

  p5.draw = () => {
    p5.background(250);
    p5.normalMaterial();
    p5.push();
    p5.rotateZ(p5.frameCount * 0.01);
    p5.rotateX(p5.frameCount * 0.01);
    p5.rotateY(p5.frameCount * 0.01);
    p5.plane(100);
    p5.pop();
  };
};

export function App() {
  return <ReactP5Wrapper sketch={sketch} />;
}

TypeScript Generics

We also support the use of Generics to add type definitions for your props. If used, the props will be properly typed when the props are passed to the updateWithProps method.

To utilise generics you can use one of two methods. In both of the examples below, we create a custom internal type called MySketchProps which is a union type of SketchProps and a custom type which has a rotation key applied to it.

Sidenote:

We could also write the MySketchProps type as an interface to do exactly the same thing if that is to your personal preference:
interface MySketchProps extends SketchProps {
  rotation: number;
}

This means, in these examples, that when the rotation prop that is provided as part of the props passed to the updateWithProps function, it will be correctly typed as a number.

Usage with the `P5CanvasInstance` type

import React, { useEffect, useState } from "react";
import {
  P5CanvasInstance,
  ReactP5Wrapper,
  SketchProps
} from "react-p5-wrapper";

type MySketchProps = SketchProps & {
  rotation: number;
};

function sketch(p5: P5CanvasInstance<MySketchProps>) {
  let rotation = 0;

  p5.setup = () => p5.createCanvas(600, 400, p5.WEBGL);

  p5.updateWithProps = props => {
    if (props.rotation) {
      rotation = (props.rotation * Math.PI) / 180;
    }
  };

  p5.draw = () => {
    p5.background(100);
    p5.normalMaterial();
    p5.noStroke();
    p5.push();
    p5.rotateY(rotation);
    p5.box(100);
    p5.pop();
  };
}

export function App() {
  const [rotation, setRotation] = useState(0);

  useEffect(() => {
    const interval = setInterval(
      () => setRotation(rotation => rotation + 100),
      100
    );

    return () => {
      clearInterval(interval);
    };
  }, []);

  return <ReactP5Wrapper sketch={sketch} rotation={rotation} />;
}

Usage with the `Sketch` type

import React, { useEffect, useState } from "react";
import { ReactP5Wrapper, Sketch, SketchProps } from "react-p5-wrapper";

type MySketchProps = SketchProps & {
  rotation: number;
};

const sketch: Sketch<MySketchProps> = p5 => {
  let rotation = 0;

  p5.setup = () => p5.createCanvas(600, 400, p5.WEBGL);

  p5.updateWithProps = props => {
    if (props.rotation) {
      rotation = (props.rotation * Math.PI) / 180;
    }
  };

  p5.draw = () => {
    p5.background(100);
    p5.normalMaterial();
    p5.noStroke();
    p5.push();
    p5.rotateY(rotation);
    p5.box(100);
    p5.pop();
  };
};

export function App() {
  const [rotation, setRotation] = useState(0);

  useEffect(() => {
    const interval = setInterval(
      () => setRotation(rotation => rotation + 100),
      100
    );

    return () => {
      clearInterval(interval);
    };
  }, []);

  return <ReactP5Wrapper sketch={sketch} rotation={rotation} />;
}

Using abstracted setup and draw functions

import React from "react";
import { ReactP5Wrapper } from "react-p5-wrapper";

function setup(p5) {
  return () => {
    p5.createCanvas(600, 400, p5.WEBGL);
  };
}

function draw(p5) {
  return () => {
    p5.background(250);
    p5.normalMaterial();
    p5.push();
    p5.rotateZ(p5.frameCount * 0.01);
    p5.rotateX(p5.frameCount * 0.01);
    p5.rotateY(p5.frameCount * 0.01);
    p5.plane(100);
    p5.pop();
  };
}

function sketch(p5) {
  p5.setup = setup(p5);
  p5.draw = draw(p5);
}

export function App() {
  return <ReactP5Wrapper sketch={sketch} />;
}

Props

The only required property of the ReactP5Wrapper component is the sketch prop. The sketch prop is a function that will be passed a p5 instance to use for rendering your sketches as shown in the usage section above.

You can pass as many custom props as you want to the ReactP5Wrapper component and these will all be passed into the updateWithProps method if you have defined it within your sketch.

Reacting to props

In the below example you see the updateWithProps method being used. This is called when the component initially renders and when the props passed to the wrapper are changed, if it is set within your sketch. This way we can render our ReactP5Wrapper component and react to component prop changes directly within our sketches!

import React, { useEffect, useState } from "react";
import { ReactP5Wrapper } from "react-p5-wrapper";

function sketch(p5) {
  let rotation = 0;

  p5.setup = () => p5.createCanvas(600, 400, p5.WEBGL);

  p5.updateWithProps = props => {
    if (props.rotation) {
      rotation = (props.rotation * Math.PI) / 180;
    }
  };

  p5.draw = () => {
    p5.background(100);
    p5.normalMaterial();
    p5.noStroke();
    p5.push();
    p5.rotateY(rotation);
    p5.box(100);
    p5.pop();
  };
}

export function App() {
  const [rotation, setRotation] = useState(0);

  useEffect(() => {
    const interval = setInterval(
      () => setRotation(rotation => rotation + 100),
      100
    );

    return () => {
      clearInterval(interval);
    };
  }, []);

  return <ReactP5Wrapper sketch={sketch} rotation={rotation} />;
}

Children

To render a component on top of the sketch, you can add it as a child of the ReactP5Wrapper component and then use the exported P5WrapperClassName constant in your to style one element above the other via css.

For instance, using styled components, we could center some text on top of our sketch like so:

import { P5WrapperClassName, ReactP5Wrapper } from "react-p5-wrapper";
import styled, { createGlobalStyle } from "styled-components";

const GlobalWrapperStyles = createGlobalStyle`
  .${P5WrapperClassName} {
    position: relative;
  }
`;

const StyledCentredText = styled.span`
  .${P5WrapperClassName} & {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-size: 2rem;
    margin: 0;
    text-align: center;
  }
`;

export function App() {
  const [rotation, setRotation] = useState(0);

  useEffect(() => {
    const interval = setInterval(
      () => setRotation(rotation => rotation + 100),
      100
    );

    return () => {
      clearInterval(interval);
    };
  }, []);

  return (
    <Fragment>
      <GlobalWrapperStyles />
      <ReactP5Wrapper sketch={sketch} rotation={rotation}>
        <StyledCentredText>Hello world!</StyledCentredText>
      </ReactP5Wrapper>
    </Fragment>
  );
}

Of course you can also use any other css-in-js library or by just using simple css to achieve almost anything you can imagine just by using the wrapper class as your root selector.

Development

NOTE: The source code for the component is in the src directory.

To build, watch and serve the examples which will also watch the component source, run:

  pnpm start

crenaz/p5-react