太阳与月亮，带CSS变量

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html

css

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html

css

* {
  box-sizing: border-box;
}
:root {
  --sea-height: 0.3;
  --x: 0.5;
  --y: 0.5;
  --lightness: 31.1111;
  --sea-lightness: 22.2222;
  --sun-spread: 0.375;
  --ripple-opacity: 0.333333;
  --ripple-scale: 0.333333;
  --moon-offset: 0;
  --mouth-opening: 0.2;
  --shade-position: -200;
  --flip: 1;
}
body {
  background-color: hsl(194, 100%, calc(var(--lightness, 50) * 1%));
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  overflow: hidden;
  cursor: none;
}
.moon {
  --face-color: #fff;
  height: 20vh;
  width: 20vh;
  background: var(--face-color);
  border-radius: 100%;
  position: absolute;
  bottom: 100%;
  left: calc(var(--x, 0.5) * 100%);
  overflow: hidden;
  transition: -webkit-transform 0.25s ease 0s;
  transition: transform 0.25s ease 0s;
  transition: transform 0.25s ease 0s, -webkit-transform 0.25s ease 0s;
  -webkit-transform: translate(-50%, calc(var(--moon-offset) * 1vh));
          transform: translate(-50%, calc(var(--moon-offset) * 1vh));
}
.sea {
  width: 100vw;
  position: absolute;
  top: calc((1 - var(--sea-height)) * 100vh);
  left: 0;
  right: 0;
  bottom: 0;
  background: hsl(215, 100%, calc(var(--sea-lightness) * 1%));
}
.sea__ripples {
  width: 15vh;
  position: absolute;
  top: 0;
  bottom: 0;
  left: calc(var(--x, 0.5) * 100%);
  height: calc(var(--sea-height) * 100vh);
  -webkit-transform: translate(-50%, 0) scaleX(var(--ripple-scale));
          transform: translate(-50%, 0) scaleX(var(--ripple-scale));
  overflow: hidden;
  clip-path: inset(0 0 0 0);
  -webkit-clip-path: inset(0 0 0 0);
  opacity: var(--ripple-opacity);
}
.sea__ripple {
  width: 100%;
  height: 10%;
  background: #ffa500;
  position: absolute;
  border-radius: 100%;
  -webkit-animation: ripple 20s calc(var(--ripple-index) * -1s) infinite linear both;
          animation: ripple 20s calc(var(--ripple-index) * -1s) infinite linear both;
}
.sun {
  --face-color: #ff0;
  height: 20vh;
  width: 20vh;
  position: absolute;
  top: calc(var(--y, 0.5) * 100%);
  left: calc(var(--x, 0.5) * 100%);
  -webkit-transform: translate(-50%, -50%);
          transform: translate(-50%, -50%);
  border-radius: 100%;
  background: #ffa500;
}
.sun__rays {
  height: calc((100 + (var(--sun-spread) * 100)) * 1%);
  width: calc((100 + (var(--sun-spread) * 100)) * 1%);
  position: absolute;
  top: 50%;
  left: 50%;
  border-radius: 100%;
  overflow: hidden;
  -webkit-transform: translate(-50%, -50%) rotate(0deg);
          transform: translate(-50%, -50%) rotate(0deg);
  -webkit-animation: spin calc((20 - (var(--sun-spread) * 10)) * 1s) infinite linear;
          animation: spin calc((20 - (var(--sun-spread) * 10)) * 1s) infinite linear;
}
@-webkit-keyframes spin {
  to {
    -webkit-transform: translate(-50%, -50%) rotate(360deg);
            transform: translate(-50%, -50%) rotate(360deg);
  }
}
@keyframes spin {
  to {
    -webkit-transform: translate(-50%, -50%) rotate(360deg);
            transform: translate(-50%, -50%) rotate(360deg);
  }
}
.sun__ray {
  position: absolute;
  top: 50%;
  left: 50%;
  background: #ffa500;
  height: 100%;
  width: 500%;
  display: block;
  -webkit-clip-path: polygon(0 0, 100% 0, 100% 100%);
  clip-path: polygon(0 0, 100% 0, 100% 100%);
  -webkit-transform: rotate(calc((var(--ray-index) * (360 / 20)) * 1deg));
          transform: rotate(calc((var(--ray-index) * (360 / 20)) * 1deg));
  -webkit-transform-origin: top left;
          transform-origin: top left;
}
/**
* Shared face styles
*/
.face {
  background: var(--face-color);
  height: 100%;
  width: 100%;
  position: absolute;
  border-radius: 100%;
  top: 50%;
  left: 50%;
  -webkit-transform: translate(-50%, -50%) rotateY(calc(var(--flip, 0) * 180deg));
          transform: translate(-50%, -50%) rotateY(calc(var(--flip, 0) * 180deg));
}
.mouth {
  position: absolute;
  top: 80%;
  left: 50%;
  height: 40%;
  width: 30%;
  -webkit-transform: translate(-50%, -50%) rotate(-5deg);
          transform: translate(-50%, -50%) rotate(-5deg);
}
.lip {
  background: var(--face-color);
  position: absolute;
  height: 100%;
  width: 120%;
  border-radius: 100%;
  left: 50%;
  top: -40%;
  -webkit-transform: translate(-50%, -50%);
          transform: translate(-50%, -50%);
}
.mouth-opening {
  position: absolute;
  height: 100%;
  width: 100%;
  background: #111;
  border-radius: 100%;
  left: 50%;
  top: 0%;
  -webkit-transform: translate(-50%, -50%) translate(0, calc((var(--mouth-opening) + 0.075) * -100%));
          transform: translate(-50%, -50%) translate(0, calc((var(--mouth-opening) + 0.075) * -100%));
  overflow: hidden;
}
.mouth-opening:after {
  content: '';
  position: absolute;
  background: #f00;
  top: 80%;
  left: 70%;
  height: 30%;
  width: 30%;
  border-radius: 100%;
}
.eyes {
  height: 25%;
  width: 50%;
  position: absolute;
  top: 30%;
  left: 45%;
  -webkit-transform: translate(-50%, 0) rotate(-5deg);
          transform: translate(-50%, 0) rotate(-5deg);
  z-index: 2;
}
.eye {
  height: 100%;
  width: 50%;
  border-radius: 100%;
  position: absolute;
  top: 0;
}
.eye:nth-of-type(1) {
  left: 0%;
}
.eye:nth-of-type(2) {
  right: 0%;
}
.eye-pupil {
  height: 25%;
  width: 25%;
  background: #111;
  position: absolute;
  top: 50%;
  left: 50%;
  -webkit-transform: translate(-50%, -50%);
          transform: translate(-50%, -50%);
  border-radius: 100%;
  -webkit-animation: blink 10s infinite;
          animation: blink 10s infinite;
}
@-webkit-keyframes blink {
  0%, 73%, 75%, 100% {
    -webkit-transform: translate(-50%, -50%) scaleY(1);
            transform: translate(-50%, -50%) scaleY(1);
  }
  74% {
    -webkit-transform: translate(-50%, -50%) scaleY(0.1);
            transform: translate(-50%, -50%) scaleY(0.1);
  }
}
@keyframes blink {
  0%, 73%, 75%, 100% {
    -webkit-transform: translate(-50%, -50%) scaleY(1);
            transform: translate(-50%, -50%) scaleY(1);
  }
  74% {
    -webkit-transform: translate(-50%, -50%) scaleY(0.1);
            transform: translate(-50%, -50%) scaleY(0.1);
  }
}
.moon .face {
  top: 60%;
  background: transparent;
}
.moon .face:after {
  content: '';
  height: 50%;
  width: 50%;
  position: absolute;
  top: -10%;
  left: -20%;
  border-radius: 100%;
  background-color: #bfbfbf;
  box-shadow: 0 0 2px 4px #999 inset;
}
.moon .face:before {
  content: '';
  height: 20%;
  width: 20%;
  position: absolute;
  top: 60%;
  left: 70%;
  border-radius: 100%;
  background-color: #bfbfbf;
  box-shadow: 0 0 2px 4px #999 inset;
}
.shades {
  width: 100%;
  height: 80%;
  position: relative;
  top: 10%;
  transition: opacity 0.25s ease, -webkit-transform 0.25s ease;
  transition: transform 0.25s ease, opacity 0.25s ease;
  transition: transform 0.25s ease, opacity 0.25s ease, -webkit-transform 0.25s ease;
  -webkit-transform: translate(calc(var(--shade-position) * 0.15vw), 0);
          transform: translate(calc(var(--shade-position) * 0.15vw), 0);
  opacity: calc(1 + var(--shade-position));
}
.shades-lens {
  width: 50%;
  height: 100%;
  background: #000;
  position: absolute;
  top: 0;
  opacity: 0.85;
  border: 4px solid #000;
  border-radius: 20% 20% 50% 35%/20% 20% 75% 60%;
}
.shades-lens:nth-of-type(1) {
  left: 0;
  overflow: hidden;
}
.shades-lens:nth-of-type(1):after {
  content: '';
  position: absolute;
  top: 0;
  left: 15%;
  width: 30%;
  height: 100%;
  background: linear-gradient(90deg, #fff, #fff 25%, transparent 25%, transparent 45%, #fff 45%);
  -webkit-transform: skewX(-20deg);
          transform: skewX(-20deg);
}
.shades-lens:nth-of-type(2) {
  right: 0;
  -webkit-transform: rotateY(180deg);
          transform: rotateY(180deg);
}
@-webkit-keyframes ripple {
  from {
    -webkit-transform: translate(0, -5vh) scale(1);
            transform: translate(0, -5vh) scale(1);
  }
  to {
    -webkit-transform: translate(0, 35vh) scale(1);
            transform: translate(0, 35vh) scale(1);
  }
}
@keyframes ripple {
  from {
    -webkit-transform: translate(0, -5vh) scale(1);
            transform: translate(0, -5vh) scale(1);
  }
  to {
    -webkit-transform: translate(0, 35vh) scale(1);
            transform: translate(0, 35vh) scale(1);
  }
}

JavaScript

const MIN_LIGHTNESS = 0
const MAX_LIGHTNESS = 70
const MAX_SEA_LIGHTNESS = 50
const BOTTOM_BUFFER = 0.1
const SEA_HEIGHT = 0.3
const SUN_HEIGHT = 0.2
const RIPPLE_BOUNDARY = 1 - SEA_HEIGHT - SUN_HEIGHT / 2
const updatePosition = e => {
  const { clientX: x, clientY: y } =
    e.touches && e.touches.length ? e.touches[0] : e
  // Set the sun/moon/ripple position
  const positionX = x / window.innerWidth
  const positionY = y / window.innerHeight
  document.documentElement.style.setProperty('--x', positionX)
  document.documentElement.style.setProperty('--y', positionY)
  /**
   * On change calculate the following things
   * 1. Darkness of sea and sky
   * 2. Spread and blur of the sun
   * 3. Ripple scale
   * 4. Ripple speed
   * 5. Whether sun brings out his shades
   * 6. Moon position?
   */
  /**
   * Calculate the darkness of the sea and sky
   * We say the lightness can go between 10% and 70%
   */
  let lightness = MIN_LIGHTNESS
  let seaLightness = MIN_LIGHTNESS
  if (positionY < 1 - BOTTOM_BUFFER) {
    lightness =
      (1 - positionY / (1 - BOTTOM_BUFFER)) * (MAX_LIGHTNESS - MIN_LIGHTNESS) +
      MIN_LIGHTNESS
    seaLightness =
      (1 - positionY / (1 - BOTTOM_BUFFER)) *
        (MAX_SEA_LIGHTNESS - MIN_LIGHTNESS) +
      MIN_LIGHTNESS
  }
  document.documentElement.style.setProperty('--lightness', lightness)
  document.documentElement.style.setProperty('--sea-lightness', seaLightness)
  /**
   * Spread and blur of the sun
   * Shouldn't start growing until we at sea height plus half the sun height
   *
   */
  let radius = 0
  const boundary = 1 - SEA_HEIGHT + SUN_HEIGHT / 2
  if (positionY <= boundary) radius = 1 - positionY / boundary
  document.documentElement.style.setProperty('--sun-spread', radius)
  /**
   * Calculate the ripple scale and opacity
   * To start out with it's not seen and the scaleX is 0
   */
  let opacity = 0
  let scale = 0
  if (positionY <= RIPPLE_BOUNDARY) {
    opacity = scale = Math.min(
      1,
      1 - (positionY - 0.3) / (RIPPLE_BOUNDARY - 0.3)
    )
  }
  document.documentElement.style.setProperty('--ripple-opacity', opacity)
  document.documentElement.style.setProperty('--ripple-scale', scale)
  /**
   * Gently open eyes and mouth
   * Use scaleX on both. Eyes can always be in blinking mode?
   */
  /**
   * If y position is above 0.9 bring the moon out
   * Else put him away
   */
  let moonOffset = 0
  if (positionY > 0.9) moonOffset = 15
  document.documentElement.style.setProperty('--moon-offset', moonOffset)
  /**
   * Figure out mouth translation
   * Start at 0.3, translate down to 0
   */
  let mouthOpening = 0.2
  if (positionY <= RIPPLE_BOUNDARY) {
    mouthOpening = Math.min(
      0.2,
      Math.max(0, (positionY - 0.3) / (RIPPLE_BOUNDARY - 0.3))
    )
  }
  document.documentElement.style.setProperty('--mouth-opening', mouthOpening)
  /**
   * Control the shades
   * If y is above 0.4 put them away else
   * show them
   */
  let shadePosition = -200
  if (positionY > 0.4) {
    shadePosition = -200
  } else {
    shadePosition = 0
  }
  document.documentElement.style.setProperty('--shade-position', shadePosition)
  /**
   * Flip the faces if the xPosition is aove 0.5
   */
  let flipY = 0
  if (positionX <= 0.5) {
    flipY = 1
  }
  document.documentElement.style.setProperty('--flip', flipY)
}
window.addEventListener('touchmove', updatePosition)
window.addEventListener('mousemove', updatePosition)

updatePosition({
  clientX: window.innerWidth / 2,
  clientY: window.innerHeight / 2,
})

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