Dynamic Sorting Bar Chart

Bar race is a chart that shows changes in the ranking of data over time and it is supported by default sinde ECharts 5.

Bar race charts usually use horizontal bars. If you want to use vertical bars, just take the X axis and Y axis in this tutorial to the opposite.

  1. Set realtimeSort of the bar series to be true to enable bar race
  2. Set yAxis.inverse to be true to display longer bars at top
  3. yAxis.animationDuration is suggested to be set to be 300 for bar reordering animation for the first time
  4. yAxis.animationDurationUpdate is suggested to be set to be 300 for bar reordering animation for later times
  5. Set yAxis.max to be n - 1 where n is the number of bars to be displayed; otherwise, all bars are displayed
  6. xAxis.max is suggested to be set to be 'dataMax' so that the maximum of data is used as X maximum.
  7. If realtime label changing is required, set series.label.valueAnimation to be true
  8. Set animationDuration to be 0 so that the first animation doesn't start from 0; if you wish otherwise, set it to be the same value as animationDurationUpdate
  9. animationDurationUpdate is suggested to be set to be 3000 for animation update duration, which should be the same as the frequency of calling setOption
  10. Call setOption to update data to be of next time with setInterval at the frequency of animationDurationUpdate

Demo

A complete demo:

var data = [];
for (let i = 0; i < 5; ++i) {
  data.push(Math.round(Math.random() * 200));
}

option = {
  xAxis: {
    max: 'dataMax'
  },
  yAxis: {
    type: 'category',
    data: ['A', 'B', 'C', 'D', 'E'],
    inverse: true,
    animationDuration: 300,
    animationDurationUpdate: 300,
    max: 2 // only the largest 3 bars will be displayed
  },
  series: [
    {
      realtimeSort: true,
      name: 'X',
      type: 'bar',
      data: data,
      label: {
        show: true,
        position: 'right',
        valueAnimation: true
      }
    }
  ],
  legend: {
    show: true
  },
  animationDuration: 0,
  animationDurationUpdate: 3000,
  animationEasing: 'linear',
  animationEasingUpdate: 'linear'
};

function run() {
  var data = option.series[0].data;
  for (var i = 0; i < data.length; ++i) {
    if (Math.random() > 0.9) {
      data[i] += Math.round(Math.random() * 2000);
    } else {
      data[i] += Math.round(Math.random() * 200);
    }
  }
  myChart.setOption(option);
}

setTimeout(function() {
  run();
}, 0);
setInterval(function() {
  run();
}, 3000);
live

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