hello-world/graph.html at master · Great3github/hello-world · GitHub

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<!doctype html>
<html>
<head>
    <title>ugwa views</title>

    <meta charset="utf-8" />
    <meta http-equiv="Content-type" content="text/html; charset=utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1" />
    <style type="text/css">
    html,
    body {
      height: 100%;
    }
    body {
      margin: 0;
      display: flex;
      background-color: black;
    }
    #canvas {
      flex: auto;
    }
    </style>
</head>

<body>
  <canvas id="canvas"></canvas>
<script>
  const params = new URL(window.location).searchParams
  const proms = []
  const end = new Date()
  const date = params.get('start') ? new Date(params.get('start')) : new Date()
  if (!params.get('start')) {
    date.setHours(date.getHours() - 4)
  }
  let max = 0
  function getViews (date, i) {
    const time = date.getHours() + ':' + date.getMinutes().toString().padStart(2, '0')
    const request = `https://sheep.thingkingland.app/counter/UGWA_${
      date.toISOString().slice(0, 15)
    }/`
    return fetch(request).then(r => r.text()).then(num => {
      num = +num
      if (num > max) max = num
      return { num, time, i, request }
    })
  }
  let i = 0
  for (; date <= end; date.setMinutes(date.getMinutes() + 10), i++) {
    proms.push(getViews(date, i))
  }
  date.setMinutes(date.getMinutes() - 10)
  i--
  const canvas = document.getElementById('canvas')
  const c = canvas.getContext('2d')
  const width = window.innerWidth
  const height = window.innerHeight
  const dpr = window.devicePixelRatio
  canvas.width = width * dpr
  canvas.height = height * dpr
  c.scale(dpr, dpr)
  const padding = 40
  function wait (time) {
    return new Promise(resolve => setTimeout(resolve, time))
  }
  Promise.all(proms).then(graph => {
    function render () {
      c.clearRect(0, 0, width, height)
      const col = (width - 2 * padding) / (graph.length - 1)
      c.strokeStyle = '#e91e63'
      c.lineWidth = 2
      c.textAlign = 'center'
      c.font = '10px monospace'
      c.textBaseline = 'bottom'
      c.beginPath()
      for (const { num, time, i } of graph) {
        const x = i * col + padding
        const y = height - padding - num / max * (height - 2 * padding)
        if (i === 0) {
          c.moveTo(x, y)
        } else {
          c.lineTo(x, y)
        }
        c.fillStyle = 'white'
        c.fillText(num, x, y)
        c.fillStyle = 'rgba(255, 255, 255, 0.5)'
        c.fillText(time, x, height - padding + (i % 2 === 0 ? 20 : 30))
      }
      c.stroke()
      c.fillStyle = 'rgba(233, 30, 99, 0.2)'
      c.beginPath()
      c.moveTo(width - padding, height - padding)
      c.lineTo(padding, height - padding)
      for (const { num, i } of graph) {
        const x = i * col + padding
        const y = height - padding - num / max * (height - 2 * padding)
        c.lineTo(x, y)
      }
      c.closePath()
      c.fill()
      console.log('rendered')
    }
    render()
    ;(async () => {
      while (true) {
        await wait(1000)
        if (date + 10 <= end) {
          date.setMinutes(date.getMinutes() + 10)
          i++
        }
        await getViews(date, i)
          .then(data => {
            graph[i] = data
          })
        render()
      }
    })()
  })
</script>
</body>
</html>