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Javascript

Javascript - Blurry Loading

HiroDaegu 2021. 9. 23. 01:16
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<!DOCTYPE html>
<html lang="ko">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Blurry Loading</title>
  <link rel="stylesheet" href="style.css">
  <script defer src="main.js"></script>
</head>
<body>
  <section class="bg"></section>
  <div class="loading-text">0%</div>
</body>
</html>
@import url('https://fonts.googleapis.com/css?family=Ubuntu');

* {
  box-sizing: border-box;
}

body {
  font-family: 'Ubuntu', sans-serif;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
  overflow: hidden;
  margin: 0;
}

.bg {
  background: url('./1.jpg') no-repeat center center/cover;
  position: absolute;
  top: -30;
  left: -30;
  width: calc(100vw + 60px);
  height: calc(100vh + 60px);
  z-index: -1;
  filter: blur(30px);
}

.loading-text {
  font-size: 50px;
  color: #000;

}
const loadText = document.querySelector(".loading-text");
const bg = document.querySelector(".bg");

let load = 0;

let int = setInterval(blurring, 30);

function blurring() {
  load++;
  if(load > 99) {
    clearInterval(int);
  }
  loadText.innerText = `${load}%`;
  loadText.style.opacity = scale(load, 0, 100, 1, 0)
  bg.style.filter = `blur(${scale(load, 0, 100, 30, 0)}px)`
}

// https://stackoverflow.com/questions/10756313/javascript-jquery-map-a-range-of-numbers-to-another-range-of-numbers
const scale = (num, in_min, in_max, out_min, out_max) => {
  return ((num - in_min) * (out_max - out_min)) / (in_max - in_min) + out_min
}
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