Draw On Element with Cursor

<script src="https://cdn.jsdelivr.net/npm/gsap@3.12.5/dist/gsap.min.js"></script>

<div class="draw-section">
  <div data-draw="" class="draw-section-bg">
    <img src="images/bg-image.avif" loading="lazy" alt="" class="section-bg-image">
   </div>
  <div class="draw-section-overlay">
    <h1 class="draw-heading">draw with</h1>
    <h1 class="draw-heading align-right">your cursor</h1>
  </div>
</div>

.draw-section {
  width: 100%;
  height: 100vh;
  margin-bottom: 50vh;
  position: relative;
}

.draw-heading {
  text-transform: uppercase;
  margin-top: 0;
  margin-bottom: 0;
  font-family: PP Neue Corp Tight, Arial, sans-serif;
  font-size: 11.25em;
  font-weight: 700;
  line-height: 1;
}

.draw-heading.align-right {
  text-align: right;
}

.draw-section-bg {
  z-index: 0;
  width: 100%;
  height: 100%;
}

.section-bg-image {
  object-fit: cover;
  width: 100%;
  height: 100%;
}

.draw-section-overlay {
  z-index: 2;
  pointer-events: none;
  flex-flow: column;
  justify-content: space-between;
  align-items: stretch;
  padding: 2em;
  display: flex;
  position: absolute;
  inset: 0%;
}

[data-draw]{
  position: relative;
}

svg.cursor-svg {
  position: absolute;
  z-index: 10;
  top: 0;
  left: 0;
  height: 100%;
  width: 100%;
  pointer-events: none;
  mix-blend-mode: difference;
}

svg.cursor-svg line {
  stroke: #FF9900;
  stroke-width: 15;
  stroke-linecap: round;
  stroke-linejoin: round;
}

[data-draw]{
  position: relative;
}

svg.cursor-svg {
  position: absolute;
  z-index: 10;
  top: 0;
  left: 0;
  height: 100%;
  width: 100%;
  pointer-events: none;
  mix-blend-mode: difference;
}

svg.cursor-svg line {
  stroke: #FF9900;
  stroke-width: 15;
  stroke-linecap: round;
  stroke-linejoin: round;
}

function supportsTouch() {
  return (('ontouchstart' in window) ||
     (navigator.maxTouchPoints > 0) ||
     (navigator.msMaxTouchPoints > 0));
}

function initDrawing() {
  if (supportsTouch()) { return; } // Exit function if it's a touch device
  
  let svgns = "http://www.w3.org/2000/svg";
  
  // Function that creates an SVG Line
  function createLine(root, x, y) {
    let line = document.createElementNS(svgns, "line");
    line.setAttribute("x1", x);
    line.setAttribute("y1", y);
    line.setAttribute("x2", x);
    line.setAttribute("y2", y);
    root.appendChild(line);
    return line;
  }
  
  function handleDrawing(element) {
    // Create an empty SVG inside the [data-draw] wrapper. This is where we will render the lines in
    let svgRoot = document.createElementNS(svgns, "svg");
    svgRoot.classList.add("cursor-svg");
    element.appendChild(svgRoot);
    
    let currentLine = null;
    
    // Place first coordinate on mouseenter of [data-draw] element
    element.addEventListener("mouseenter", (event) => {
      currentLine = createLine(svgRoot, event.offsetX, event.offsetY);
    });
    
    // Create lines on every mousemove
    element.addEventListener("mousemove", (event) => {
      if (currentLine) {
        currentLine.setAttribute("x2", event.offsetX);
        currentLine.setAttribute("y2", event.offsetY);
        currentLine = createLine(svgRoot, event.offsetX, event.offsetY);
      }
    });
    
    // On mouseleave of the [data-draw] wrap, smoothly remove all lines
    element.addEventListener("mouseleave", () => {
      if (currentLine) {
        gsap.to(svgRoot.querySelectorAll("line"), {
          strokeOpacity: 0,
          duration: 0.01,
          stagger: 0.01,
          ease: "none",
          onComplete: () => {
            svgRoot
              .querySelectorAll("line")
              .forEach((line) => svgRoot.removeChild(line));
          },
        });
        currentLine = null;
      }
    });
  }
  document.querySelectorAll("[data-draw]").forEach(handleDrawing);
}

// Initialize Draw on Element with Cursor
document.addEventListener('DOMContentLoaded', () => {
  initDrawing();
});