const cards = document.querySelectorAll(".dir-card");

function getDirection(e, item) {
  const rect = item.getBoundingClientRect();
  const w = rect.width;
  const h = rect.height;
  
  /* Calculate the exact mouse position relative to the center of the element safely */
  const x = (e.clientX - rect.left - (w / 2)) * (w > h ? (h / w) : 1);
  const y = (e.clientY - rect.top - (h / 2)) * (h > w ? (w / h) : 1);
  
  /* Math.atan2 returns the angle, we map it cleanly to 4 quadrants (0: Top, 1: Right, 2: Bottom, 3: Left) */
  const direction = Math.round((Math.atan2(y, x) * (180 / Math.PI) + 180) / 90 + 3) % 4;
  return direction;
}

cards.forEach(function(card) {
  const overlay = card.querySelector(".dir-overlay");
  
  card.addEventListener("mouseenter", function(e) {
    const dir = getDirection(e, card);
    
    /* Pre-position the overlay instantly without transition */
    overlay.style.transition = "none";
    
    if (dir === 0) overlay.style.transform = "translate(0, -100%)";
    else if (dir === 1) overlay.style.transform = "translate(100%, 0)";
    else if (dir === 2) overlay.style.transform = "translate(0, 100%)";
    else overlay.style.transform = "translate(-100%, 0)";
    
    /* Force a reflow safely so the CSS engine registers the new position */
    void overlay.offsetWidth;
    
    /* Restore transition and slide into the center */
    overlay.style.transition = "transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1)";
    overlay.style.transform = "translate(0, 0)";
  });
  
  card.addEventListener("mouseleave", function(e) {
    const dir = getDirection(e, card);
    
    /* Slide out smoothly toward the exit direction */
    if (dir === 0) overlay.style.transform = "translate(0, -100%)";
    else if (dir === 1) overlay.style.transform = "translate(100%, 0)";
    else if (dir === 2) overlay.style.transform = "translate(0, 100%)";
    else overlay.style.transform = "translate(-100%, 0)";
  });
});

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Direction Aware Hover Overlay JS

Impress visitors with a highly advanced mathematical interaction. As your mouse enters the card, the beautiful colored overlay slides in seamlessly from the exact direction you entered.

#javascript

#css

#hover effect

#direction aware

#math

#overlay

#portfolio

#interactive

/HTML *CSS ()JS Output Live Updates

*, *::before, *::after {
  box-sizing: border-box;
}

body {
  font-family: system-ui, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
  margin: 0;
  background: #f8fafc;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  padding: 20px;
}

.direction-grid {
  display: flex;
  gap: 30px;
  flex-wrap: wrap;
  justify-content: center;
}

.dir-card {
  position: relative;
  width: 300px;
  height: 300px;
  border-radius: 20px;
  overflow: hidden;
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
  cursor: pointer;
}

.card-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.dir-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(59, 130, 246, 0.9);
  backdrop-filter: blur(8px);
  color: #ffffff;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 20px;
  /* Start hidden securely */
  transform: translate(-100%, 0);
  transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.dir-overlay h3 {
  margin: 0 0 10px 0;
  font-size: 1.75rem;
  letter-spacing: 1px;
}

.dir-overlay p {
  margin: 0;
  font-size: 1.1rem;
  opacity: 0.9;
}

const cards = document.querySelectorAll(".dir-card");

function getDirection(e, item) {
  const rect = item.getBoundingClientRect();
  const w = rect.width;
  const h = rect.height;
  
  /* Calculate the exact mouse position relative to the center of the element safely */
  const x = (e.clientX - rect.left - (w / 2)) * (w > h ? (h / w) : 1);
  const y = (e.clientY - rect.top - (h / 2)) * (h > w ? (w / h) : 1);
  
  /* Math.atan2 returns the angle, we map it cleanly to 4 quadrants (0: Top, 1: Right, 2: Bottom, 3: Left) */
  const direction = Math.round((Math.atan2(y, x) * (180 / Math.PI) + 180) / 90 + 3) % 4;
  return direction;
}

cards.forEach(function(card) {
  const overlay = card.querySelector(".dir-overlay");
  
  card.addEventListener("mouseenter", function(e) {
    const dir = getDirection(e, card);
    
    /* Pre-position the overlay instantly without transition */
    overlay.style.transition = "none";
    
    if (dir === 0) overlay.style.transform = "translate(0, -100%)";
    else if (dir === 1) overlay.style.transform = "translate(100%, 0)";
    else if (dir === 2) overlay.style.transform = "translate(0, 100%)";
    else overlay.style.transform = "translate(-100%, 0)";
    
    /* Force a reflow safely so the CSS engine registers the new position */
    void overlay.offsetWidth;
    
    /* Restore transition and slide into the center */
    overlay.style.transition = "transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1)";
    overlay.style.transform = "translate(0, 0)";
  });
  
  card.addEventListener("mouseleave", function(e) {
    const dir = getDirection(e, card);
    
    /* Slide out smoothly toward the exit direction */
    if (dir === 0) overlay.style.transform = "translate(0, -100%)";
    else if (dir === 1) overlay.style.transform = "translate(100%, 0)";
    else if (dir === 2) overlay.style.transform = "translate(0, 100%)";
    else overlay.style.transform = "translate(-100%, 0)";
  });
});

Direction Aware Hover Overlay JS

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