Efeitos visuais criativos
Efeito de rastro de partículas

Partículas coloridas que fluem seguindo o movimento do mouse ou do toque.
HTMLCanvasJavaScriptPartículas
É possível editar, executar e salvar este exemplo após ativar JavaScript. O código-fonte fixo é o seguinte:
<!doctype html>
<html lang="pt-BR" dir="ltr">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Efeito de rastro de partículas</title>
  <style>
    * { box-sizing: border-box; }
    :root { color-scheme: dark; }
    body { min-height: 100vh; margin: 0; overflow: hidden; color: #f3f5ff; font-family: "Avenir Next", "Microsoft YaHei", sans-serif; background: #05050d; }
    canvas { position: fixed; inset: 0; width: 100%; height: 100%; touch-action: none; cursor: crosshair; }
    .noise { position: fixed; inset: 0; pointer-events: none; opacity: .18; background-image: radial-gradient(rgba(255,255,255,.22) .7px, transparent .7px); background-size: 7px 7px; mask-image: linear-gradient(to bottom, black, transparent 85%); }
    header { position: fixed; z-index: 2; top: clamp(28px, 8vh, 78px); left: clamp(24px, 7vw, 80px); max-width: 620px; pointer-events: none; }
    .eyebrow { color: #71f5d0; font-size: 10px; font-weight: 900; letter-spacing: .28em; }
    h1 { margin: 12px 0 14px; font: 500 clamp(46px, 10vw, 96px)/.9 Georgia, "STSong", serif; letter-spacing: -.05em; }
    p { max-width: 470px; margin: 0; color: #848aa3; line-height: 1.75; }
    .palette { position: fixed; z-index: 3; right: 24px; bottom: 24px; display: flex; align-items: center; gap: 10px; padding: 9px 12px; border: 1px solid #24263a; border-radius: 999px; color: #8e94ad; font-size: 11px; background: rgba(10,10,22,.78); backdrop-filter: blur(10px); }
    button { width: 30px; height: 30px; border: 2px solid #fff; border-radius: 50%; background: linear-gradient(135deg, #71f5d0, #6a78ff, #ff6fae); cursor: pointer; box-shadow: 0 0 15px rgba(113,245,208,.35); }
    button:focus-visible { outline: 3px solid #fff; outline-offset: 3px; }
  </style>
</head>
<body>
  <canvas id="particles" aria-label="Trajetória de partículas gerada pelo movimento do ponteiro"></canvas><div class="noise" aria-hidden="true"></div>
  <header><span class="eyebrow">INTERACTIVE LIGHT FIELD</span><h1>Tocar um feixe de luz</h1><p>Mova o mouse ou o dedo; as partículas coloridas crescem ao longo do trajeto, derivam e se dissipam lentamente.</p></header>
  <div class="palette"><span>Clique para alternar o tom</span><button id="palette" type="button" aria-label="Alternar tonalidade das partículas"></button></div>
  <script>
    const canvas = document.querySelector('#particles');
    const context = canvas.getContext('2d');
    const reduceMotion = matchMedia('(prefers-reduced-motion: reduce)').matches;
    const palettes = [[160, 250], [280, 350], [25, 90]];
    let paletteIndex = 0, width = 0, height = 0, particles = [], pointer = { x: 0, y: 0, active: false };

    function resize() {
      const ratio = Math.min(devicePixelRatio || 1, 2);
      width = innerWidth; height = innerHeight;
      canvas.width = Math.round(width * ratio); canvas.height = Math.round(height * ratio);
      context.setTransform(ratio, 0, 0, ratio, 0, 0);
    }
    function emit(x, y, amount = 7) {
      const range = palettes[paletteIndex];
      for (let index = 0; index < (reduceMotion ? Math.min(amount, 2) : amount); index += 1) {
        const angle = Math.random() * Math.PI * 2, speed = .3 + Math.random() * 1.8;
        particles.push({ x, y, vx: Math.cos(angle) * speed, vy: Math.sin(angle) * speed, size: 1.5 + Math.random() * 4, life: 1, decay: .012 + Math.random() * .018, hue: range[0] + Math.random() * (range[1] - range[0]) });
      }
      if (particles.length > 650) particles.splice(0, particles.length - 650);
    }
    function movePointer(event) {
      const rect = canvas.getBoundingClientRect(); pointer = { x: event.clientX - rect.left, y: event.clientY - rect.top, active: true }; emit(pointer.x, pointer.y);
    }
    function frame() {
      context.fillStyle = 'rgba(5, 5, 13, .16)'; context.fillRect(0, 0, width, height);
      context.globalCompositeOperation = 'lighter';
      particles = particles.filter(particle => {
        particle.x += particle.vx; particle.y += particle.vy; particle.vx *= .985; particle.vy = particle.vy * .985 - .008; particle.life -= particle.decay;
        if (particle.life <= 0) return false;
        context.globalAlpha = particle.life;
        context.fillStyle = `hsl(${particle.hue} 90% 65%)`;
        context.beginPath(); context.arc(particle.x, particle.y, particle.size * particle.life, 0, Math.PI * 2); context.fill(); return true;
      });
      context.globalAlpha = 1; context.globalCompositeOperation = 'source-over'; requestAnimationFrame(frame);
    }
    canvas.addEventListener('pointermove', movePointer);
    canvas.addEventListener('pointerdown', event => { movePointer(event); emit(pointer.x, pointer.y, 28); });
    canvas.addEventListener('pointerleave', () => { pointer.active = false; });
    document.querySelector('#palette').addEventListener('click', () => { paletteIndex = (paletteIndex + 1) % palettes.length; emit(width * .75, height * .65, 40); });
    addEventListener('resize', resize); resize(); emit(width * .72, height * .64, 55); requestAnimationFrame(frame);
  </script>
</body>
</html>