Day 2 - JS and CSS clock

START

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<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <title>JS + CSS Clock</title>
  </head>
  <body>
    <div class="clock">
      <div class="clock-face">
        <div class="hand hour-hand"></div>
        <div class="hand min-hand"></div>
        <div class="hand second-hand"></div>
      </div>
    </div>

    <style>
      html {
        background: #018ded url(https://unsplash.it/1500/1000?image=881&blur=5);
        background-size: cover;
        font-family: "helvetica neue";
        text-align: center;
        font-size: 10px;
      }

      body {
        margin: 0;
        font-size: 2rem;
        display: flex;
        flex: 1;
        min-height: 100vh;
        align-items: center;
      }

      .clock {
        width: 30rem;
        height: 30rem;
        border: 20px solid white;
        border-radius: 50%;
        margin: 50px auto;
        position: relative;
        padding: 2rem;
        box-shadow: 0 0 0 4px rgba(0, 0, 0, 0.1), inset 0 0 0 3px #efefef,
          inset 0 0 10px black, 0 0 10px rgba(0, 0, 0, 0.2);
      }

      .clock-face {
        position: relative;
        width: 100%;
        height: 100%;
        transform: translateY(
          -3px
        ); /* account for the height of the clock hands */
      }

      .hand {
        width: 50%;
        height: 6px;
        background: black;
        position: absolute;
        top: 50%;
      }
    </style>

    <script></script>
  </body>
</html>

FINISHED

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<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <title>JS + CSS Clock</title>
  </head>
  <body>
    <div class="clock">
      <div class="clock-face">
        <div class="hand hour-hand"></div>
        <div class="hand min-hand"></div>
        <div class="hand second-hand"></div>
      </div>
    </div>

    <style>
      html {
        background: #018ded url(https://unsplash.it/1500/1000?image=881&blur=5);
        background-size: cover;
        font-family: "helvetica neue";
        text-align: center;
        font-size: 10px;
      }

      body {
        margin: 0;
        font-size: 2rem;
        display: flex;
        flex: 1;
        min-height: 100vh;
        align-items: center;
      }

      .clock {
        width: 30rem;
        height: 30rem;
        border: 20px solid white;
        border-radius: 50%;
        margin: 50px auto;
        position: relative;
        padding: 2rem;
        box-shadow: 0 0 0 4px rgba(0, 0, 0, 0.1), inset 0 0 0 3px #efefef,
          inset 0 0 10px black, 0 0 10px rgba(0, 0, 0, 0.2);
      }

      .clock-face {
        position: relative;
        width: 100%;
        height: 100%;
        transform: translateY(
          -3px
        ); /* account for the height of the clock hands */
      }

      .hand {
        width: 50%;
        height: 6px;
        background: black;
        position: absolute;
        top: 50%;
        transform-origin: 100%;
        transform: rotate(90deg);
        transition: all 0.05s;
        transition-timing-function: cubic-bezier(0.1, 2.7, 0.58, 1);
      }
    </style>

    <script>
      const secHand = document.querySelector(".second-hand");
      const minHand = document.querySelector(".min-hand");
      const hourHand = document.querySelector(".hour-hand");

      function setClock() {
        const now = new Date();

        const sec = now.getSeconds();
        const secDeg = (sec / 60) * 360 + 90;
        secHand.style.transform = `rotate(${secDeg}deg)`;

        const min = now.getMinutes();
        const minDeg = (min / 60) * 360 + (sec / 60) * 6 + 90;
        minHand.style.transform = `rotate(${minDeg}deg)`;

        const hour = now.getHours();
        const hourDeg = (hour / 12) * 360 + (min / 60) * 30 + 90;
        hourHand.style.transform = `rotate(${hourDeg}deg)`;
      }

      setInterval(setClock, 1000);
      setClock();
    </script>
  </body>
</html>

rotate css 속성을 자주 접하지 않아 난해했다. 아무리 돌려도 중간을 중심으로 침이 돌아가지 않아서 솔루션을 봤는데, css를 수정했어야 했다.

.hand css 속성에

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transform-origin: 100%;
transform: rotate(90deg);
transition: all 0.05s;
transition-timing-function: cubic-bezier(0.1, 2.7, 0.58, 1);

위의 항목을 추가한다. 이 작업만 하면 초마다, 분마다, 시간마다 침이 몇 도(degree) 움직여야 하는지만 알면 Date()를 사용하여 현재 초, 분, 시간을 받아올 수 있다. 시계는 1초마다 움직이므로 setInterval(function, 1000)으로 시계를 움직이는 함수를 작성해서 실행한다.