如何在d3js中制作分组叠加条形图？ [英] How to make grouped stacked bar chart in d3js?

问题描述

我有以下d3图表，它们都是分组的，每个分组都包含一个堆积条。但不知何故，我觉得这不是一种适当的实施方式，而且很复杂。如果只有堆积条形图，我会使用 d3.stack（）。有人能告诉我有没有更好的方法呢？

I've the following d3 chart which is both grouped and each grouped contains a stacked bar. But somehow, I feel this is not a proper way to implement and little complicated. If there was only stacked bar chart, I would have used d3.stack(). Can someone let me know is there any better way to do this?

片段如下：

var data = [
  {
    Category: "cat1",
    type1: 300,
    type2: 450,
    type3: 120
  },
  {
    Category: "cat2",
    type1: 400,
    type2: 100,
    type3: 200
  },
  {
    Category: "cat3",
    type1: 400,
    type2: 100,
    type3: 200
  },
  {
    Category: "cat4",
    type1: 400,
    type2: 100,
    type3: 200
  }
];

var margin = { top: 20, right: 20, bottom: 30, left: 40 },
  width = 500 - margin.left - margin.right,
  height = 500 - margin.top - margin.bottom;
var barWidth = 40;
var x0 = d3.scaleBand().range([0, width]);

var x1 = d3.scaleBand();

var y = d3.scaleLinear().range([height, 0]);

var xAxis = d3.axisBottom(x0);

var yAxis = d3.axisLeft(y).tickFormat(d3.format(".2s"));

var color = d3.scaleOrdinal().range(["#98abc5", "#8a89a6", "#7b6888"]);

var svg = d3
  .select("body")
  .append("svg")
  .attr("width", width + margin.left + margin.right)
  .attr("height", height + margin.top + margin.bottom)
  .append("g")
  .attr("transform", "translate(" + margin.left + "," + margin.top + ")");

var yBegin;

var innerColumns = {
  column1: ["type1", "type2"],
  column2: ["type3"]
};
var columnHeaders = d3.keys(data[0]).filter(function(key) {
  return key !== "Category";
});
color.domain(
  d3.keys(data[0]).filter(function(key) {
    return key !== "Category";
  })
);
var groupData = data.forEach(function(d) {
  var yColumn = new Array();
  d.columnDetails = columnHeaders.map(function(name) {
    for (ic in innerColumns) {
      if (innerColumns[ic].indexOf(name) >= 0) {
        if (!yColumn[ic]) {
          yColumn[ic] = 0;
        }
        yBegin = yColumn[ic];
        yColumn[ic] += +d[name];
        return {
          name: name,
          column: ic,
          yBegin: yBegin,
          yEnd: +d[name] + yBegin
        };
      }
    }
  });
  d.total = d3.max(d.columnDetails, function(d) {
    return d.yEnd;
  });
});

//console.log(data);
x0.domain(
  data.map(function(d) {
    return d.Category;
  })
);
x1.domain(d3.keys(innerColumns)).range([0, x0.bandwidth()]);

y.domain([
  0,
  1.15 *
    d3.max(data, function(d) {
      return d.total;
    })
]);

svg
  .append("g")
  .attr("class", "x axis")
  .attr("transform", "translate(0," + height + ")")
  .call(xAxis);

svg
  .append("g")
  .attr("class", "y axis")
  .call(yAxis);

var stackedbar = svg
  .selectAll(".stackedbar")
  .data(data)
  .enter()
  .append("g")
  .attr("class", "g")
  .attr("transform", function(d) {
    return "translate(" + x0(d.Category) + ",0)";
  });

stackedbar
  .selectAll("rect")
  .data(function(d) {
    return d.columnDetails;
  })
  .enter()
  .append("rect")
  .attr("width", barWidth)
  .attr("x", function(d) {
    return x1(d.column) + (x1.bandwidth() - barWidth) / 2;
  })
  .attr("y", function(d) {
    return y(d.yEnd);
  })
  .attr("height", function(d) {
    return y(d.yBegin) - y(d.yEnd);
  })
  .style("fill", function(d) {
    return color(d.name);
  });

body {
  font: 10px sans-serif;
}
 
.axis path,
.axis line {
  fill: none;
  stroke: #000;
  shape-rendering: crispEdges;
}
 
.bar {
  fill: steelblue;
}

 

<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/5.6.0/d3.min.js"></script>

推荐答案

我试图用<实现分组堆积条形图EM> d3.stack（）的。以下是我的解决方案的两个重要部分：

I have tried to achieve grouped stacked bar chart using d3.stack(). Here are 2 important parts of my solution:

var datasets=[d3.stack().keys(['type1','type3'])(data),
              d3.stack().keys(['type2'])(data)];

var num_groups=datasets.length;

这里我使用d3.stack的.keys（）方法为每个组创建数据集。在此之后，我们可以使用代码创建堆积条形图，如下所示：

Here I am using .keys() method of d3.stack to create datasets for each group. After this we can use the code for creating stacked bar chart like this:

d3.range(num_groups).forEach(function(gnum) {
        svg.selectAll('g.group'+gnum)
            .data(datasets[gnum])
            .enter()
            .append('g')
                .attr('fill',accent)
                .attr('class', 'group'+gnum)
            .selectAll('rect')
            .data(d=>d)
            .enter()
            .append('rect')
                .attr('x',(d,i)=>xscale(xlabels[i])+(xscale.bandwidth()/num_groups)*gnum)
                .attr('y',d=>yscale(d[1]))
                .attr('width',xscale.bandwidth()/num_groups)
                .attr('height',d=>yscale(d[0])-yscale(d[1]));
            });

您可以在此处查看完整的解决方案： https://jsfiddle.net/Abhi9kt/28wzdrfk/4/

You can see the complete solution here: https://jsfiddle.net/Abhi9kt/28wzdrfk/4/

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