Chart.js Progressive Line 示例

HTML

CSS

JavaScript

HTML

<!DOCTYPE html>
<html lang="zh">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no" />
<title>Chart.js Progressive Line</title>
<meta name="keywords" content="LightYear,光年,后台模板,后台管理系统,光年HTML模板">
<meta name="description" content="LightYear是一个基于Bootstrap的后台管理系统的HTML模板。">
<meta name="author" content="yinqi">
<link rel="stylesheet" type="text/css" href="http://lyear.itshubao.com/v4/css/bootstrap.min.css">
<link rel="stylesheet" type="text/css" href="http://lyear.itshubao.com/v4/css/style.min.css">
</head>
  
<body>
<div class="chart-example">
  <div class="tab-content">
    <div class="chart-view"><canvas id="myChart"></canvas></div>
    <div class="chart-actions mt-3"></div>
    <ul class="nav nav-tabs mt-3">
      <li class="nav-item">
        <a class="nav-link active" data-toggle="tab" href="#myChart-config" aria-selected="true">Config</a>
      </li>
      <li class="nav-item">
        <a class="nav-link" data-toggle="tab" href="#myChart-animation" aria-selected="false">Animation</a>
      </li>
      <li class="nav-item">
        <a class="nav-link" data-toggle="tab" href="#myChart-data" aria-selected="false">Data</a>
      </li>
    </ul>
    <div class="tab-content">
      <div class="tab-pane fade show active tab-pane-code" id="myChart-config">
        <pre>
const config = {
  type: 'line',
  data: {
    datasets: [{
      borderColor: Utils.CHART_COLORS.red,
      borderWidth: 1,
      radius: 0,
      data: data,
    },
    {
      borderColor: Utils.CHART_COLORS.blue,
      borderWidth: 1,
      radius: 0,
      data: data2,
    }]
  },
  options: {
    animation,
    interaction: {
      intersect: false
    },
    plugins: {
      legend: false
    },
    scales: {
      x: {
        type: 'linear'
      }
    }
  }
};
        </pre>
      </div>
      <div class="tab-pane fade tab-pane-code" id="myChart-animation">
        <pre>
const totalDuration = 10000;
const delayBetweenPoints = totalDuration / data.length;
const previousY = (ctx) => ctx.index === 0 ? ctx.chart.scales.y.getPixelForValue(100) : ctx.chart.getDatasetMeta(ctx.datasetIndex).data[ctx.index - 1].getProps(['y'], true).y;
const animation = {
  x: {
    type: 'number',
    easing: 'linear',
    duration: delayBetweenPoints,
    from: NaN, // the point is initially skipped
    delay(ctx) {
      if (ctx.type !== 'data' || ctx.xStarted) {
        return 0;
      }
      ctx.xStarted = true;
      return ctx.index * delayBetweenPoints;
    }
  },
  y: {
    type: 'number',
    easing: 'linear',
    duration: delayBetweenPoints,
    from: previousY,
    delay(ctx) {
      if (ctx.type !== 'data' || ctx.yStarted) {
        return 0;
      }
      ctx.yStarted = true;
      return ctx.index * delayBetweenPoints;
    }
  }
};
        </pre>
      </div>
      <div class="tab-pane fade tab-pane-code" id="myChart-data">
        <pre>
const data = [];
const data2 = [];
let prev = 100;
let prev2 = 80;
for (let i = 0; i < 1000; i++) {
  prev += 5 - Math.random() * 10;
  data.push({x: i, y: prev});
  prev2 += 5 - Math.random() * 10;
  data2.push({x: i, y: prev2});
}
        </pre>
      </div>
    </div>
  </div>
</div>

<script type="text/javascript" src="http://lyear.itshubao.com/v4/js/jquery.min.js"></script>
<script type="text/javascript" src="http://lyear.itshubao.com/v4/js/popper.min.js"></script>
<script type="text/javascript" src="http://lyear.itshubao.com/v4/js/bootstrap.min.js"></script>
<script type="text/javascript" src="https://cdn.bootcdn.net/ajax/libs/Chart.js/4.1.1/chart.umd.min.js"></script>
<script type="text/javascript" src="https://cdn.bootcdn.net/ajax/libs/luxon/3.2.0/luxon.min.js"></script>
<script type="text/javascript" src="http://libs.itshubao.com/chartjs/utils.js"></script>
</body>
</html>

CSS

body{
  background: #fff;
}
.tab-content .chart-view {
  max-width: 800px;
}
.tab-content .tab-pane-code {
  height: 360px;
  overflow: auto;
}
.tab-content .tab-pane-code pre {
  height: 100%;
  margin: 0px;
}
.chart-example {
  width: calc(100% - 2px);
  border: 1px solid #ececec;
  padding: 10px;
}

JavaScript

const data = [];
const data2 = [];
let prev = 100;
let prev2 = 80;
for (let i = 0; i < 1000; i++) {
  prev += 5 - Math.random() * 10;
  data.push({x: i, y: prev});
  prev2 += 5 - Math.random() * 10;
  data2.push({x: i, y: prev2});
}

const totalDuration = 10000;
const delayBetweenPoints = totalDuration / data.length;
const previousY = (ctx) => ctx.index === 0 ? ctx.chart.scales.y.getPixelForValue(100) : ctx.chart.getDatasetMeta(ctx.datasetIndex).data[ctx.index - 1].getProps(['y'], true).y;
const animation = {
  x: {
    type: 'number',
    easing: 'linear',
    duration: delayBetweenPoints,
    from: NaN, // the point is initially skipped
    delay(ctx) {
      if (ctx.type !== 'data' || ctx.xStarted) {
        return 0;
      }
      ctx.xStarted = true;
      return ctx.index * delayBetweenPoints;
    }
  },
  y: {
    type: 'number',
    easing: 'linear',
    duration: delayBetweenPoints,
    from: previousY,
    delay(ctx) {
      if (ctx.type !== 'data' || ctx.yStarted) {
        return 0;
      }
      ctx.yStarted = true;
      return ctx.index * delayBetweenPoints;
    }
  }
};

const config = {
  type: 'line',
  data: {
    datasets: [{
      borderColor: Utils.CHART_COLORS.red,
      borderWidth: 1,
      radius: 0,
      data: data,
    },
    {
      borderColor: Utils.CHART_COLORS.blue,
      borderWidth: 1,
      radius: 0,
      data: data2,
    }]
  },
  options: {
    animation,
    interaction: {
      intersect: false
    },
    plugins: {
      legend: false
    },
    scales: {
      x: {
        type: 'linear'
      }
    }
  }
};

const ctx = document.getElementById('myChart');

const chart = new Chart(ctx, config);