d3中的嵌套图和折线图答案

【问题标题】：Nested plot and line graph in d3d3中的嵌套图和折线图
【发布时间】：2016-10-02 16:33:09
【问题描述】：

我有正确的带有相关颜色的绘图图。但是，我应该用一条线连接每个图。有两组地块。所以会有两个单独的线组（也称为嵌套）。我不知道该怎么做。

<!DOCTYPE html>
<html>
 <head>
<meta charset="utf-8">
<script src="//cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/d3-legend/1.1.0/d3-legend.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/d3-tip/0.6.3/d3-tip.min.js"></script>
   <style>
    h1 { border-bottom: solid 3px #EBEBED; color: #545c61; font-size: 20px; padding-left: 35px; font-family: sans-serif; padding-bottom: 17px; font-weight: 500; margin-bottom: 37px; padding-top: 8px;}

    circle{ fill:white; stroke-width: 3px;}

    path { stroke: red; stroke-width: 2; fill: none; }

    .axis text {
    font-family: 'Open Sans', sans-serif;
    font-size: 14pt;
  }

  .axis path, .axis line {
    fill: none;
    stroke: none;
    shape-rendering: crispEdges;
  }
    .y.axis { stroke: #babfc5; }
    .y.axis text{ font-weight:100; transform: translate(-24px,0px); }
    .y.axis line { stroke: #EBEBED; stroke-width: 2; }
    .x.axis { stroke: #8e8e8e; }
    .x.axis text{ font-weight: 500; transform:translate(0px,14px)}


  </style>
 </head>
  <body>
  <h1>Example</h1>
<script>
    var outerWidth = 1080;
    var outerHeight = 330;
    var margin = { left: 190, top: 30, right: 30, bottom: 40 };
    var padding = 1.0;
    var circleRadius = 8;
    var xColumn = "month";
    var yColumn = "amount";
    var colorColumn = "monthv";
    var yAxisTitlesOffset = { top: 10 }


    var innerWidth = outerWidth - margin.left - margin.right;
    var innerHeight = outerHeight - margin.top - margin.bottom;



  var svg = d3.select("body").append("svg")
    .attr("width", outerWidth)
    .attr("height", outerHeight);
  var g = svg.append("g")
    .attr("transform", "translate(" + margin.left + "," + margin.top + ")");
  var xAxisG = g.append("g")
    .attr("class", "x axis")
    .attr("transform", "translate(0," + innerHeight + ")");
  var yAxisG = g.append("g")
    .attr("class", "y axis");




    var xScale = d3.scale.ordinal()
        .rangeBands([0, innerWidth],padding);
    var yScale = d3.scale.linear()
        .range([innerHeight,0]);
    var colorScale = d3.scale.ordinal()
        .domain(["top", "bot"])
        .range(["#43B365", "#DA5A60" ])




    var xAxis = d3.svg.axis().scale(xScale).orient("bottom")
    .outerTickSize(0);          // Turn off the marks at the end of the axis.
    var yAxis = d3.svg.axis().scale(yScale).orient("left")
    .ticks(4)            
    .tickSize(-innerWidth)
    .outerTickSize(0)
    .tickFormat( function(d) { return "$" + d} );

    var format = d3.format(",");
    var formattedX = format(yAxis);



    function render(data){

        xScale.domain(       data.map( function (d){ return d[xColumn]; }));
        yScale.domain([0, 2000]);
        //if this code is inserted in the max value instead of 2000 - it will show the max data value d3.max(data, function (d){ return d[yColumn]; })
        xAxisG.call(xAxis);
        yAxisG.call(yAxis);

        svg.append("path")
        .attr("class", "line")
        .attr("d", valueline(data));

        //bind data
        var circles = g.selectAll("circle").data(data);
        //Enter
        circles.enter().append("circle")
            .attr("r", circleRadius);
        //update
        circles
            .attr("cx", function (d){ return xScale(d[xColumn]); })
            .attr("cy", function (d){ return yScale(d[yColumn]); })
            .style("stroke", function (d){ return  colorScale(d[colorColumn]); })
        //exit 
        circles.exit().remove();
    }




  function type(d){
    d.amount = +d.amount;
    return d;
  }

  var data = [
    {
      "month": "Jan",
      "monthv": "top",
      "amount": 400
    },
    {
      "month": "Jan",
      "monthv": "bot",
      "amount": 100
    },
    {
      "month": "Feb",
      "monthv": "top",
      "amount": 800
    },
    {
      "month": "Feb",
      "monthv": "bot",
      "amount": 250
    },
    {
      "month": "Mar",
      "monthv": "top",
      "amount": 750
    },
    {
      "month": "Mar",
      "monthv": "bot",
      "amount": 200
    },
    {
      "month": "Apr",
      "monthv": "top",
      "amount": 850
    },
      {
      "month": "Apr",
      "monthv": "bot",
      "amount": 250
    },
    {
      "month": "May",
      "monthv": "top",
      "amount": 800
    },
      {
      "month": "May",
      "monthv": "bot",
      "amount": 250
    },
    {
      "month": "Jun",
      "monthv": "top",
      "amount": 850
    },
      {
      "month": "Jun",
      "monthv": "bot",
      "amount": 250
    },
    {
      "month": "Jul",
      "monthv": "top",
      "amount": 1000
    },
      {
      "month": "Jul",
      "monthv": "bot",
      "amount": 300
    },
    {
      "month": "Aug",
      "monthv": "top",
      "amount": 1050
    },
    {
      "month": "Aug",
      "monthv": "bot",
      "amount": 300
    },
    {
      "month": "Sep",
      "monthv": "top",
      "amount": 1000
    },
    {
      "month": "Sep",
      "monthv": "bot",
      "amount": 300
    },
    {
      "month": "Oct",
      "monthv": "top",
      "amount": 1200
    },
    {
      "month": "Oct",
      "monthv": "bot",
      "amount": 300
    },
    {
      "month": "Nov",
      "monthv": "top",
      "amount": 1100
    },
    {
      "month": "Nov",
      "monthv": "bot",
      "amount": 250
    },
    {
      "month": "Dec",
      "monthv": "top",
      "amount": 1250
    },
    {
      "month": "Dec",
      "monthv": "bot",
      "amount": 250
    }
  ];

  render(data);
</script>
</body>
</html>

我想要看起来像这样的东西 http://bl.ocks.org/d3noob/38744a17f9c0141bcd04 。但是，当我在代码中定义该行并将其定义为路径时，出现错误。不知道该怎么做。

【问题讨论】：

标签： javascript arrays d3.js

【解决方案1】：

你忘了定义valueline，路径生成器：d3.svg.line：

var valueline = d3.svg.line()
    .x(function(d) { return xScale(d[xColumn]); })
    .y(function(d) { return yScale(d[yColumn]); });

注意数据的定义方式，您需要调用路径生成器两次过滤顶行和底行的数据。您还可以准备数据，使其每个月都有一个对象，其值为顶线和底线：

g.append("path")
.attr("class", "line")
.attr("d", valueTopline(data.filter( e => e[colorColumn] === "top")))
.style("stroke", colorScale("top"));

g.append("path")
.attr("class", "line")
.attr("d", valueTopline(data.filter( e => e[colorColumn] === "bot")))
.style("stroke", colorScale("bot"));

您还需要将路径附加到组 <g>，而不是直接附加到 svg 以匹配比例。

这是更新后的jsbin code：

【讨论】：

【解决方案2】：

首先，您必须将两行的数据分开。有几种方法可以做到这一点。在这里，我使用的是filter：

var dataTop = data.filter(function(d){ return d.monthv == "top"});
var dataBot = data.filter(function(d){ return d.monthv == "bot"});

然后，您将这些数据用于每一行：

g.append("path").attr("d", valueline(dataTop));
g.append("path").attr("d", valueline(dataBot));

我正在使用此解决方案，因为您只有 2 行。如果你有几行，另一种方法可能会更好（除非你想要很多冗余代码）。

这是你的小提琴：https://jsfiddle.net/jh3foyn6/

【讨论】：