Mouse Tracking Googly Eyes SVG Emoji

Open In Editor Publish Your Code

<p><a target="">Move Your Cursor</a></p>

CSS

JS

const eyesSVG = document.querySelector('#eyes');
const eyes = [
  {
    eye: eyesSVG.querySelector('#eye-left'),
    pupil: eyesSVG.querySelector('#pupil-left'),
    offsetX: 0
  },
  {
    eye: eyesSVG.querySelector('#eye-right'),
    pupil: eyesSVG.querySelector('#pupil-right'),
    offsetX: 0
  }
];

const updateEye = (ev, {eye, pupil, offsetX}) => {
  const eyeRect = eye.getBoundingClientRect();
  const centerX = eyeRect.left + eyeRect.width / 2;
  const centerY = eyeRect.top + eyeRect.height / 2;

const distX = ev.clientX - centerX;
  const distY = ev.clientY - centerY;

const pupilRect = pupil.getBoundingClientRect();
  const maxDistX = pupilRect.width / 2;
  const maxDistY = pupilRect.height / 2;

const angle = Math.atan2(distY, distX);

const newPupilX = offsetX + Math.min(maxDistX, Math.max(-maxDistX, Math.cos(angle) * maxDistX));
  const newPupilY = Math.min(maxDistY, Math.max(-maxDistY, Math.sin(angle) * maxDistY));
  
  const svgCTM = eyesSVG.getScreenCTM();
  const scaledPupilX = newPupilX / svgCTM.a; 
  const scaledPupilY = newPupilY / svgCTM.d;

pupil.setAttribute('transform', `translate(${scaledPupilX}, ${scaledPupilY})`);
}

// Pupil position starts off-centre on the X axis
const calcOffset = () => {
  for (const props of eyes) {
    props.pupil.removeAttribute('transform');
    const eyeRect = props.eye.getBoundingClientRect();
    const pupilRect = props.pupil.getBoundingClientRect();
    props.offsetX = ((eyeRect.right - pupilRect.right) - (pupilRect.left - eyeRect.left)) / 2;
  }
}
calcOffset();

globalThis.addEventListener('resize', () => {
  calcOffset();
});

Mouse Tracking Googly Eyes SVG Emoji

Recommended

Emoji Toggle

Mouse Follower Cat HTML CSS JavaScript

Emoji Rating

HTML

CSS

JS

Recommended

Emoji Toggle

Mouse Follower Cat HTML CSS JavaScript

Emoji Rating

HTMLCopy

CSSCopy

JSCopy

HTML

CSS

JS