D3 Examples - concentric clock d3.js

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<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <style>
    body {
      margin: 0;
      position: fixed;
      top: 0;
      right: 0;
      bottom: 0;
      left: 0;
      background-color: #008080;
    }
  </style>
</head>
​
<body>
  <script>
let margin = { top: 0, right: 0, bottom: 0, left: 0 }
let width = window.innerWidth - margin.left - margin.right
let height = window.innerHeight - margin.top - margin.bottom
​
//--------------------------------------------------
//  CLOCK CIRCLES
//--------------------------------------------------
​
xyFromBase = (baseTime, radius, base) => {
  //baseTime is current minutes, seconds or hours
  //radius is distance from the current circle to the next outter circle
  //base is 60 for minutes and seconds; 12 for hours
  let radians = (baseTime * 360) / base
  radians = (radians * Math.PI) / 180
  radians = radians - Math.PI / 2
  return [Math.cos(radians) * radius, Math.sin(radians) * radius]
}
​
let svg = d3
  .select('body')
  .append('svg')
  .attr('width', width)
  .attr('height', height)
​
// faceRadius is 95% of smaller(width, height)
let outterRadius = (Math.min(width, height) / 2) * 0.95
​
const hourLineWidth = 1,
  minuteLineWidth = 1,
  secondLineWidth = 1
​
const faceR = outterRadius
const hourR = faceR * 0.75
const minR = hourR * 0.75
const secR = minR * 0.75
const hRadius = faceR - hourR
const mRadius = hourR - minR
const sRadius = minR - secR
​
const date = new Date()
let hours = date.getHours() % 12
let minutes = date.getMinutes()
let seconds = date.getSeconds()
​
//clock face is the maximum circle in the viewport, centered
let faceCenter = [width / 2, height / 2]
let clockFaceCircle = svg
  .append('circle')
  .style('fill', '#001be5')
  .attr('cx', faceCenter[0])
  .attr('cy', faceCenter[1])
  .attr('r', faceR)
​
//hour circle
hCenter = xyFromBase(hours, hRadius, 12)
hCenter[0] += faceCenter[0]
hCenter[1] += faceCenter[1]
let hourCircle = svg
  .append('circle')
  .style('fill', '#990000')
  .style('stroke', '#990000')
  .style('stroke-width', hourLineWidth)
  .attr('cx', hCenter[0])
  .attr('cy', hCenter[1])
  .attr('r', hourR)
​
//minute circle
let mCenter = xyFromBase(minutes, mRadius, 60)
mCenter[0] += hCenter[0]
mCenter[1] += hCenter[1]
let minuteCircle = svg
  .append('circle')
  .style('fill', '#20b2aa')
  .style('stroke', '#20b2aa')
  .style('stroke-width', minuteLineWidth)
  .attr('cx', mCenter[0])
  .attr('cy', mCenter[1])
  .attr('r', minR)
​
//seconds circle
sCenter = xyFromBase(seconds, sRadius, 60)
sCenter[0] += mCenter[0]
sCenter[1] += mCenter[1]
let secondCircle = svg
  .append('circle')
  .style('fill', '#660066')
  .style('stroke', '#660066')
  .style('stroke-width', secondLineWidth)
  .attr('cx', sCenter[0])
  .attr('cy', sCenter[1])
  .attr('r', secR)
​
updateClock = () => {
  let now = new Date()
  hours = now.getHours() % 12
  minutes = now.getMinutes()
  seconds = now.getSeconds()
​
  hCenter = xyFromBase(hours, hRadius, 12)
  hCenter[0] += faceCenter[0]
  hCenter[1] += faceCenter[1]
  hourCircle
    .transition(d3.easeLinear)
    .duration(100)
    .attr('cx', hCenter[0])
    .attr('cy', hCenter[1])
​
  mCenter = xyFromBase(minutes, mRadius, 60)
  mCenter[0] += hCenter[0]
  mCenter[1] += hCenter[1]
  minuteCircle
    .transition(d3.easeLinear)
    .duration(100)
    .attr('cx', mCenter[0])
    .attr('cy', mCenter[1])
​
  sCenter = xyFromBase(seconds, sRadius, 60)
  sCenter[0] += mCenter[0]
  sCenter[1] += mCenter[1]
  secondCircle
    .transition(d3.easeLinear)
    .duration(500)
    .attr('cx', sCenter[0])
    .attr('cy', sCenter[1])
}
​
setInterval(function() {
  updateClock()
}, 1000)
​
//--------------------------------------------------
//  TIME TEXT
//--------------------------------------------------
const timeText = [
  {
    value: 0,
    size: 0,
    label: '',
    update: function(date) {
      return `${addZeroBefore(date.getHours() % 12)}:${addZeroBefore(
        date.getMinutes()
      )}:${addZeroBefore(date.getSeconds())}`
    },
  },
]
​
//add the time in text
addZeroBefore = time => {
  return (time < 10 ? '0' : '') + time
}
​
let field = svg
  .selectAll('.field')
  .data(timeText)
  .enter()
  .append('g')
  .attr('class', 'field')
​
let label = field
  .append('text')
  .attr('x', 40)
  .attr('y', height - 40)
  .attr('font-size', '20px')
  .attr('font-family', 'sans-serif')
  .style('fill', 'rgb(92, 94, 96)')
  .attr('class', 'label')
​
function updateTime() {
  let now = new Date()
  field.each(function(d) {
    ;(d.previous = d.value), (d.value = d.update(now))
  })
​
  label.text(function(d) {
    return d.value + d.label
  })
​
  label
    .transition(d3.easeLinear)
    .style('fill', 'white')
    .duration(1000)
}
setInterval(function() {
  updateTime()
}, 1000)
​
​
​
  </script>
</body>
​
    