阶梯瀑布图

Apache ECharts 中并没有单独的瀑布图类型，但是我们可以使用堆叠的柱状图模拟该效果。

假设数据数组中的值是表示对前一个值的增减：

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

也就是第一个数据是 900，第二个数据 345 表示的是在 900 的基础上增加了 345……将这个数据展示为阶梯瀑布图时，我们可以使用三个系列：第一个是不可交互的透明系列，用来实现“悬空”的柱状图效果；第二个系列用来表示正数；第三个系列用来表示负数。

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'
      }
    }
  ]
};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

阶梯瀑布图

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本文贡献者在 GitHub 上编辑本页