my-lot-pot/index.html at master · EpsilonYi/my-lot-pot · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width,initial-scale=1.0,minimum-scale=1.0,maximum-scale=1.0,user-scalable=no"/>
    <meta name="format-detection" content="telephone=no"/>
    <meta name="format-detection" content="email=no"/>
    <title>My Lot Pot</title>
</head>
<body>
    <div>
        Alpha:
        <span id="alpha"></span>
    </div>
    <div>
        Beta:
        <span id="beta"></span>
    </div>
    <div>
        Gamma:
        <span id="gamma"></span>
    </div>
    <div id="myChart" style="width: 600px;height:400px;"></div>
</body>
<script src="echarts.min.js"></script>
<script>
    let a = document.getElementById('alpha');
    let b = document.getElementById('beta');
    let g = document.getElementById('gamma');
    let chart = echarts.init(document.getElementById('myChart'));
    let minB = null;
    let maxB = null;
    let x = 0;
    let option = {
      xAxis: {
        type: 'category',
        data: []
      },
      yAxis: {
        type: 'value'
      },
      series: [{
        data: [],
        type: 'line',
        smooth: true
      }]
    };

    window.addEventListener('deviceorientation', function (event) {
        a.innerText  = event.alpha;
        b.innerText  = event.beta;
        g.innerText  = event.gamma;
        handleBeta(event.beta)
    }, false);

    function handleBeta (val) {
      if (minB === null && maxB === null) {
        maxB = minB = val;
        return;
      }
      option.series[0].data.push(val);
      option.xAxis.data.push(x++);
      chart.setOption(option);
    }
</script>
</html>