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CSS

class PointerParticle {
  constructor(spread, speed, component) {
    const { ctx, pointer, hue } = component;

this.ctx = ctx;
    this.x = pointer.x;
    this.y = pointer.y;
    this.mx = pointer.mx * 0.1;
    this.my = pointer.my * 0.1;
    this.size = Math.random() + 1;
    this.decay = 0.01;
    this.speed = speed * 0.08;
    this.spread = spread * this.speed;
    this.spreadX = (Math.random() - 0.5) * this.spread - this.mx;
    this.spreadY = (Math.random() - 0.5) * this.spread - this.my;
    this.color = `hsl(${hue}, 90%, 60%)`;
  }

draw() {
    this.ctx.fillStyle = this.color;
    this.ctx.beginPath();
    this.ctx.arc(this.x, this.y, this.size, 0, Math.PI * 2);
    this.ctx.fill();
  }

collapse() {
    this.size -= this.decay;
  }

trail() {
    this.x += this.spreadX * this.size;
    this.y += this.spreadY * this.size;
  }

update() {
    this.draw();
    this.trail();
    this.collapse();
  }
}

class PointerParticles extends HTMLElement {
  static register(tag = "pointer-particles") {
    if ("customElements" in window) {
      customElements.define(tag, this);
    }
  }

static css = `
      :host {
        display: grid;
        width: 100%;
        height: 100%;
        user-select: none;
      }
    `;

constructor() {
    super();

this.canvas;
    this.ctx;
    this.fps = 60;
    this.msPerFrame = 1000 / this.fps;
    this.timePrevious;
    this.particles = [];
    this.pointer = {
      x: 0,
      y: 0,
      mx: 0,
      my: 0
    };
    this.hue = 0;
  }

connectedCallback() {
    const canvas = document.createElement("canvas");
    const sheet = new CSSStyleSheet();

this.shadowroot = this.attachShadow({ mode: "open" });

sheet.replaceSync(PointerParticles.css);
    this.shadowroot.adoptedStyleSheets = [sheet];

this.shadowroot.append(canvas);

this.canvas = this.shadowroot.querySelector("canvas");
    this.ctx = this.canvas.getContext("2d");
    this.setCanvasDimensions();
    this.setupEvents();
    this.timePrevious = performance.now();
    this.animateParticles();
  }

createParticles(event, { count, speed, spread }) {
    this.setPointerValues(event);

for (let i = 0; i < count; i++) {
      this.particles.push(new PointerParticle(spread, speed, this));
    }
  }

setPointerValues(event) {
    this.pointer.x = event.x - this.offsetLeft;
    this.pointer.y = event.y - this.offsetTop;
    this.pointer.mx = event.movementX;
    this.pointer.my = event.movementY;
  }

setupEvents() {
    const parent = this.parentNode;

parent.addEventListener("click", (event) => {
      this.createParticles(event, {
        count: 300,
        speed: Math.random() + 1,
        spread: Math.random() + 50
      });
    });

parent.addEventListener("pointermove", (event) => {
      this.createParticles(event, {
        count: 20,
        speed: this.getSpeed(event),
        spread: 1
      });
    });

window.addEventListener("resize", () => this.setCanvasDimensions());
  }

getSpeed(event) {
    const a = event.movementX;
    const b = event.movementY;
    const c = Math.floor(Math.sqrt(a * a + b * b));

return c;
  }

handleParticles() {
    for (let i = 0; i < this.particles.length; i++) {
      this.particles[i].update();

if (this.particles[i].size <= 0.1) {
        this.particles.splice(i, 1);
        i--;
      }
    }
  }

setCanvasDimensions() {
    const rect = this.parentNode.getBoundingClientRect();

this.canvas.width = rect.width;
    this.canvas.height = rect.height;
  }

animateParticles() {
    requestAnimationFrame(() => this.animateParticles());

const timeNow = performance.now();
    const timePassed = timeNow - this.timePrevious;

if (timePassed < this.msPerFrame) return;

const excessTime = timePassed % this.msPerFrame;

this.timePrevious = timeNow - excessTime;

this.ctx.clearRect(0, 0, this.canvas.width, this.canvas.height);
    this.hue = this.hue > 360 ? 0 : (this.hue += 3);

this.handleParticles();
  }
}

PointerParticles.register();