Chart.js Quadrants 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 Quadrants</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-plugin" aria-selected="false">Plugin</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: 'scatter',
  data: data,
  options: {
    plugins: {
      quadrants: {
        topLeft: Utils.CHART_COLORS.red,
        topRight: Utils.CHART_COLORS.blue,
        bottomRight: Utils.CHART_COLORS.green,
        bottomLeft: Utils.CHART_COLORS.yellow,
      }
    }
  },
  plugins: [quadrants]
};
        </pre>
      </div>
      <div class="tab-pane fade tab-pane-code" id="myChart-plugin">
        <pre>
const quadrants = {
  id: 'quadrants',
  beforeDraw(chart, args, options) {
    const {ctx, chartArea: {left, top, right, bottom}, scales: {x, y}} = chart;
    const midX = x.getPixelForValue(0);
    const midY = y.getPixelForValue(0);
    ctx.save();
    ctx.fillStyle = options.topLeft;
    ctx.fillRect(left, top, midX - left, midY - top);
    ctx.fillStyle = options.topRight;
    ctx.fillRect(midX, top, right - midX, midY - top);
    ctx.fillStyle = options.bottomRight;
    ctx.fillRect(midX, midY, right - midX, bottom - midY);
    ctx.fillStyle = options.bottomLeft;
    ctx.fillRect(left, midY, midX - left, bottom - midY);
    ctx.restore();
  }
};
        </pre>
      </div>
      <div class="tab-pane fade tab-pane-code" id="myChart-data">
        <pre>
const DATA_COUNT = 7;
const NUMBER_CFG = {count: DATA_COUNT, min: -100, max: 100};
const data = {
  datasets: [
    {
      label: 'Dataset 1',
      data: Utils.points(NUMBER_CFG),
      borderColor: Utils.CHART_COLORS.red,
      backgroundColor: Utils.transparentize(Utils.CHART_COLORS.red, 0.5),
    },
    {
      label: 'Dataset 2',
      data: Utils.points(NUMBER_CFG),
      borderColor: Utils.CHART_COLORS.blue,
      backgroundColor: Utils.transparentize(Utils.CHART_COLORS.blue, 0.5),
    }
  ]
};
        </pre>
      </div>
    </div>
  </div>
</div>

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<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>
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<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 actions = [
  {
    name: 'Randomize',
    handler(chart) {
      chart.data.datasets.forEach(dataset => {
        dataset.data = Utils.points(NUMBER_CFG);
      });
      chart.update();
    }
  },
];

const DATA_COUNT = 7;
const NUMBER_CFG = {count: DATA_COUNT, min: -100, max: 100};
const data = {
  datasets: [
    {
      label: 'Dataset 1',
      data: Utils.points(NUMBER_CFG),
      borderColor: Utils.CHART_COLORS.red,
      backgroundColor: Utils.transparentize(Utils.CHART_COLORS.red, 0.5),
    },
    {
      label: 'Dataset 2',
      data: Utils.points(NUMBER_CFG),
      borderColor: Utils.CHART_COLORS.blue,
      backgroundColor: Utils.transparentize(Utils.CHART_COLORS.blue, 0.5),
    }
  ]
};

const quadrants = {
  id: 'quadrants',
  beforeDraw(chart, args, options) {
    const {ctx, chartArea: {left, top, right, bottom}, scales: {x, y}} = chart;
    const midX = x.getPixelForValue(0);
    const midY = y.getPixelForValue(0);
    ctx.save();
    ctx.fillStyle = options.topLeft;
    ctx.fillRect(left, top, midX - left, midY - top);
    ctx.fillStyle = options.topRight;
    ctx.fillRect(midX, top, right - midX, midY - top);
    ctx.fillStyle = options.bottomRight;
    ctx.fillRect(midX, midY, right - midX, bottom - midY);
    ctx.fillStyle = options.bottomLeft;
    ctx.fillRect(left, midY, midX - left, bottom - midY);
    ctx.restore();
  }
};

const config = {
  type: 'scatter',
  data: data,
  options: {
    plugins: {
      quadrants: {
        topLeft: Utils.CHART_COLORS.red,
        topRight: Utils.CHART_COLORS.blue,
        bottomRight: Utils.CHART_COLORS.green,
        bottomLeft: Utils.CHART_COLORS.yellow,
      }
    }
  },
  plugins: [quadrants]
};

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

const chart = new Chart(ctx, config);

$.each(actions, function(index, value) {
    let aHtml = $('<a></a>').addClass('btn btn-default m-r-5').html(value.name);
    $('.chart-actions').append(aHtml);
    aHtml.on('click', function () {
        value.handler(chart);
    });
});