Waterfall

There is no waterfall series in Apache ECharts, but we can simulate the effect using a stacked bar chart.

Assuming that the values in the data array represent an increase or decrease from the previous value.

var data = [900, 345, 393, -108, -154, 135, 178, 286, -119, -361, -203];

That is, the first data is 900 and the second data 345 represents the addition of 345 to 900, etc. When presenting this data as a stepped waterfall chart, we can use three series: the first is a non-interactive transparent series to implement the suspension bar effect; the second series is used to represent positive numbers; and the second series is used to represent negative numbers.

var data = [900, 345, 393, -108, -154, 135, 178, 286, -119, -361, -203];
var help = [];
var positive = [];
var negative = [];
for (var i = 0, sum = 0; i < data.length; ++i) {
  if (data[i] >= 0) {
    positive.push(data[i]);
    negative.push('-');
  } else {
    positive.push('-');
    negative.push(-data[i]);
  }

  if (i === 0) {
    help.push(0);
  } else {
    sum += data[i - 1];
    if (data[i] < 0) {
      help.push(sum + data[i]);
    } else {
      help.push(sum);
    }
  }
}

option = {
  title: {
    text: 'Waterfall'
  },
  grid: {
    left: '3%',
    right: '4%',
    bottom: '3%',
    containLabel: true
  },
  xAxis: {
    type: 'category',
    splitLine: { show: false },
    data: (function() {
      var list = [];
      for (var i = 1; i <= 11; i++) {
        list.push('Oct/' + i);
      }
      return list;
    })()
  },
  yAxis: {
    type: 'value'
  },
  series: [
    {
      type: 'bar',
      stack: 'all',
      itemStyle: {
        normal: {
          barBorderColor: 'rgba(0,0,0,0)',
          color: 'rgba(0,0,0,0)'
        },
        emphasis: {
          barBorderColor: 'rgba(0,0,0,0)',
          color: 'rgba(0,0,0,0)'
        }
      },
      data: help
    },
    {
      name: 'positive',
      type: 'bar',
      stack: 'all',
      data: positive
    },
    {
      name: 'negative',
      type: 'bar',
      stack: 'all',
      data: negative,
      itemStyle: {
        color: '#f33'
      }
    }
  ]
};
live

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