HSL调光旋钮开关

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html

css

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html

css

* {
  -webkit-tap-highlight-color: transparent;
  box-sizing: border-box;
}
:root {
  --hue: 216;
  --light: 37.5;
}
body {
  background: hsl(var(--hue), 50%, calc(var(--light) * 1%));
  cursor: var(--cursor);
  min-height: 100vh;
  touch-action: none;
}
.switch {
  --size: 200;
  --panel-hue: 55;
  --panel-saturation: 10;
  --faceplate: hsl(55, 10%, calc((30 + var(--light)) * 1%));
  --faceplate-light: hsl(55, 10%, calc((50 + var(--light)) * 1%));
  --faceplate-dark: hsl(55, 10%, calc((0 + var(--light)) * 1%));
  --pressed: 0;
  background: linear-gradient(0deg, var(--faceplate-dark), var(--faceplate-light));
  border-radius: 5%;
  height: calc(var(--size) * 1px);
  overflow: hidden;
  position: absolute;
  top: 50%;
  left: 50%;
  -webkit-transform: translate(-50%, -50%);
          transform: translate(-50%, -50%);
  width: calc(var(--size) * 1px);
  box-shadow: 0px 10px 0px 0px hsl(var(--hue), 50%, calc((var(--light) - 10) * 1%));
}
.switch__faceplate {
  background: var(--faceplate);
  height: calc(100% - 10px);
  width: calc(100% - 10px);
  position: absolute;
  top: 50%;
  left: 50%;
  -webkit-transform: translate(-50%, -50%);
          transform: translate(-50%, -50%);
  border-radius: 5%;
}
.switch__faceplate:after,
.switch__faceplate:before {
  --screw: hsl(0, 0%, calc((20 + var(--light)) * 1%));
  --screw-dark: hsl(0, 0%, calc((0 + var(--light)) * 1%));
  --screw-darkest: hsl(0, 0%, calc((-20 + var(--light)) * 1%));
  content: '';
  height: 8%;
  width: 8%;
  background: linear-gradient(calc(var(--rotation, 30) * 1deg), var(--screw) 0%, var(--screw) 45%, var(--screw-dark) 45%, var(--screw-dark) 55%, var(--screw) 55%);
  box-shadow: 0px 1px 0px 1px var(--screw-darkest) inset;
  border-radius: 50%;
  top: 50%;
  -webkit-transform: translate(0, -50%);
          transform: translate(0, -50%);
  position: absolute;
}
.switch__faceplate:after {
  --rotation: 120;
  right: 10%;
}
.switch__faceplate:before {
  left: 10%;
}
.switch__button {
  height: 35%;
  width: 35%;
  border: 0;
  background: var(--faceplate);
  border-radius: 50%;
  position: absolute;
  top: 50%;
  left: 50%;
  -webkit-transform: translate(-50%, -50%);
          transform: translate(-50%, -50%);
  outline: transparent;
  padding: 0;
  cursor: pointer;
}
.switch__button:before {
  content: '';
  height: 99%;
  width: 99%;
  background: var(--faceplate-dark);
  position: absolute;
  border-radius: 50%;
  top: 50%;
  left: 50%;
  -webkit-transform: translate(-50%, -50%) translate(0, calc((10 - (var(--pressed) * 10)) * 1px));
          transform: translate(-50%, -50%) translate(0, calc((10 - (var(--pressed) * 10)) * 1px));
  transition: -webkit-transform 0.15s ease 0s;
  transition: transform 0.15s ease 0s;
  transition: transform 0.15s ease 0s, -webkit-transform 0.15s ease 0s;
  z-index: -1;
}
.switch__button-face {
  border: 4px solid var(--faceplate-light);
  height: 100%;
  width: 100%;
  background: var(--faceplate);
  border-radius: 100%;
  -webkit-transform: rotate(calc(var(--rotation, 0) * 1deg));
          transform: rotate(calc(var(--rotation, 0) * 1deg));
}
.switch__button-dim-marker {
  position: absolute;
  left: 50%;
  height: 44px;
  width: 44px;
  border-radius: 50%;
  top: 10%;
  -webkit-transform: translate(-50%, -90%);
          transform: translate(-50%, -90%);
  cursor: var(--cursor, 'grab');
}
.switch__button-dim-marker:after {
  content: '';
  background: hsl(0, 100%, calc((0 + var(--light)) * 1%));
  height: 10px;
  width: 10px;
  border-radius: 100%;
  position: absolute;
  top: 100%;
  left: 50%;
  -webkit-transform: translate(-50%, -50%);
          transform: translate(-50%, -50%);
}

JavaScript

/ **
*两点之间的角度
* @param {Object}事件-当前坐标的指针事件
* @param {Object}元素-用作中心点的元素
* @param {Number}缓冲区-缓冲区，以便角度不允许手柄和轨道重叠
* /
const getAngle = (event, element) => {
  const { clientX: x, clientY: y } =
  event.touches && event.touches.length ? event.touches[0] : event;
  const {
    x: handleX,
    y: handleY,
    width: handleWidth,
    height: handleHeight } =
  element.getBoundingClientRect();
  const handleCenterPoint = {
    x: handleX + handleWidth / 2,
    y: handleY + handleHeight / 2 };

const angle =
  Math.atan2(handleCenterPoint.y - y, handleCenterPoint.x - x) * 180 /
  Math.PI;
  return angle;
};

const button = document.querySelector('.switch__button');
const dimmer = document.querySelector('.switch__button-dim-marker');

let DOWN_EVENT = 'mousedown';
let MOVE_EVENT = 'mousemove';
let UP_EVENT = 'mouseup';
if (window.PointerEvent) {
  // PointerEvent, Chrome
  DOWN_EVENT = 'pointerdown';
  MOVE_EVENT = 'pointermove';
  UP_EVENT = 'pointerup';
} else if ('ontouchstart' in window) {
  // Touch Events, iOS Safari
  DOWN_EVENT = 'touchstart';
  MOVE_EVENT = 'touchmove';
  UP_EVENT = 'touchend';
}

let ON = true;
const BUFFER = 45;
const VARIANTS = {
  ON: 60,
  OFF: 10,
  LOWER: 15,
  UPPER: 60,
  DIMMED: 0.5 };

const setLight = () => {
  document.documentElement.style.setProperty(
  '--light',
  ON ?
  VARIANTS.LOWER + (VARIANTS.UPPER - VARIANTS.LOWER) * VARIANTS.DIMMED :
  VARIANTS.OFF);

};

// Lets work out the dimming here
  // If angle is rotation is greater than 0 and less than 180 - BUFFER
  // Dim is 0.5 + (angle / 135deg) * 0.5
  if (rotation > 0 && rotation < 180 - BUFFER) {
    VARIANTS.DIMMED = 0.5 + rotation / (180 - BUFFER) * 0.5;
  } else if (rotation < 0) {
    // There's 180 - BUFFER degrees to play with but we know we have 90 degrees here.
    VARIANTS.DIMMED = 0.5 - Math.abs(rotation / (180 - BUFFER)) * 0.5;
  } else if (rotation > 180 + BUFFER && rotation < 270) {
    VARIANTS.DIMMED =
    (rotation - (180 + BUFFER)) / (180 - (90 + BUFFER)) * (
    BUFFER / (180 - BUFFER) * 0.5);
  }
  button.style.setProperty('--rotation', rotation);
  setLight();
};

const endDim = () => {
  // dim(e)
  document.documentElement.style.setProperty('--cursor', 'initial');
  dimmer.style.setProperty('--cursor', 'grab');
  document.body.removeEventListener(MOVE_EVENT, dim);
  document.body.removeEventListener(UP_EVENT, endDim);
};

const execute = () => {
  ON = !ON;
  button.style.setProperty('--pressed', 0);
  setLight();
  document.body.removeEventListener(UP_EVENT, execute);
};
const toggleLight = () => {
  button.style.setProperty('--pressed', 1);
  document.body.addEventListener(UP_EVENT, execute);
};

const initDim = e => {
  e.stopPropagation();
  document.documentElement.style.setProperty('--cursor', 'grabbing');
  dimmer.style.setProperty('--cursor', 'grabbing');
  document.body.addEventListener(MOVE_EVENT, dim);
  document.body.addEventListener(UP_EVENT, endDim);
};

dimmer.addEventListener(DOWN_EVENT, initDim);
button.addEventListener(DOWN_EVENT, toggleLight);
setLight();

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