React Rally Text x Blobs! (P5.js + React)

index.html

<div id="root"></div>

react-rally-text-x-blobs-p5-js-react.markdown

React Rally Text x Blobs! (P5.js + React)

A Pen by Monica.dev on CodePen.

License.

script.babel

import React, {
  useCallback,
  useRef
} from "https://cdn.skypack.dev/react@17.0.1";
import ReactDOM from "https://cdn.skypack.dev/react-dom@17.0.1";

import Loadable from "https://cdn.skypack.dev/@loadable/component@5.15.3";

import { colors } from "https://codepen.io/M0nica/pen/mdQZYZa/be099074545bfdf8ff8eed63078c8357.js";

// make sure we only load react-p5 on the client-side
// since we need access to the WINDOW
const Sketch = Loadable(() =>
  import("https://cdn.skypack.dev/react-p5@1.3.35")
);

const App = () => {
  // useRef allows us to update these values in our drawing hooks and
  //  maintain the value from render to render
  // otherwise we get an error like:
  /* "Assignments to the 'sizeoff' variable from 
inside React Hook useCallback will be lost after each render.
 To preserve the value over time, store it in a useRef Hook and
	keep the mutable value in the '.current' property. 
	Otherwise, you can move this variable directly inside useCallback. 
	(react-hooks/exhaustive-deps) */
  const img = useRef();
  const xoff = useRef(0.0);
  const xoff1 = useRef(0);
  const xoff2 = useRef(10000);
  const sizeoff = useRef(2);

  const drawSymbols = useCallback((p5) => {
    p5.textSize(12);
    // adjust the size of the circles based on canvas width and use frameCount increase the size of the circles as the canvas loads to make them appear to fade in

    let scale = p5.width * 0.0009; // * //p5.min(p5.frameCount * 0.02, 1);
    let margin = 50 * scale;
    for (let color of colors) {
      let { x, y } = color;
      let mx = p5.map(x, 0, img.current.width, margin, p5.width - margin);
      let my = p5.map(y, 0, img.current.height, margin, p5.width / 2 - margin);

      if (x > 600) {
        p5.fill("#7c99eb");
        xoff.current += 0.01;
        //		const noiseSize = p5.map(p5.noise(xoff), 0, 1, 2, 5.75);
        const randomSize = p5.random(10, 20) * scale;
        p5.circle(mx, my, randomSize);
        xoff.current += 1;
      } else {
        p5.fill("#ff8db0");
        p5.circle(mx, my, 3.75 * (x * 0.003 * scale));
        p5.fill("#7c99eb");
      }
    }
  }, []);

  const drawP5Asterik = useCallback((p5) => {
    const x = p5.map(p5.noise(xoff1.current), 0, 1, 0, p5.width);
    const y = p5.map(p5.noise(xoff2.current), 0, 1, 100, p5.height - 100);

    // show random movement of p5js logo to compare to noise
    //   const x = map(random(), 0, 1, 0, width);
    //   const y = map(random(), 0, 1, 100, height - 100);

    const scale = p5.width * 0.002;
    const size = p5.map(p5.noise(sizeoff.current), 0, 1, 75, 200) * scale;

    sizeoff.current += 0.08;
    xoff1.current += 0.003;
    xoff1.current += 0.003;

    p5.fill("white");
    p5.textSize(size);

    //   if (p5.frameCount > 30) {
    p5.fill("#ee1c5d");
    p5.text("⁎", x, y);
    //  }
  }, []);

  const drawSubtitle = useCallback((p5) => {
    p5.fill("#fff");
    const width = p5.width;
    const height = p5.height;
    const scale = width * 0.0009;
    p5.textSize(48 * scale);
    const xOffSet = width * 0.08;
    p5.text("Let's Sketch!", xOffSet, height * 0.78);
    p5.textSize(32 * scale);
    p5.text("Using p5.js & React to fill a Canvas", xOffSet, height * 0.85);
    p5.text("Presentation By: Monica.dev  👩🏾‍💻", xOffSet, height * 0.92);
  }, []);

  const preload = useCallback((p5) => {
    img.current = p5.loadImage(
      "https://assets.codepen.io/209274/ReactRallyLogo.png"
    );
  }, []);

  const setup = (p5, parentRef) => {
    const width = p5.windowWidth;
    p5.createCanvas(width, width * 0.5).parent(parentRef);
    p5.background(43, 33, 53);
    p5.textFont("Vidaloka");
    p5.noStroke();
    p5.frameRate(10);

    p5.describe(
      "React Rally 23 with React Rally written with distinct circles that appear to sparkle as they grow larger and eventually transition into blobby shape as the circles become so large that they overlap. There is a 23 written to the left constructed of dots  within half of the React atom logo. There is a floating p5.js asterik logo that is easing its way across the image, growing and shrinking."
    );
  };

  const windowResized = useCallback((p5) => {
    // maintain aspect ratio when window is resized
    p5.resizeCanvas(window.innerWidth, window.innerWidth / 2);
  }, []);

  const keyPressed = useCallback((p5) => {
    if (p5.key === "s") {
      p5.saveGif("react-rally-welcome", 20);
    }
    if (p5.key === "i") {
      p5.saveCanvas("react-rally-welcome");
    }
  });

  const resetCanvas = useCallback((p5) => {
    p5.clear();
    windowResized(p5); // work around  to access resize event
    p5.background(43, 33, 53);
  });

  const draw = useCallback(
    (p5) => {
      resetCanvas(p5);
      drawSymbols(p5);
      drawSubtitle(p5);
      drawP5Asterik(p5);
    },
    [drawSubtitle, drawSymbols, drawP5Asterik, windowResized]
  );

  return (
    <div className="App">
      <Sketch
        setup={setup}
        draw={draw}
        preload={preload}
        keyPressed={keyPressed}
      />
    </div>
  );
};

const rootElement = document.getElementById("root");
ReactDOM.render(<App />, rootElement);

style.css

@import url("https://fonts.googleapis.com/css2?family=Vidaloka&display=swap");

.App {
  font-family: sans-serif;
  text-align: center;
}

canvas {
  /* center canvas in middle of page */
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  height: 50%;
  padding: 20px;
  text-align: center;
}

body {
  color: #c0def1;
  background-color: #51455e;
}