Question

我正在尝试创建一个显示月度数据的d3折线图。图表绘制但x轴上的刻度线移动并且不与绘制的数据点对齐。从截图中可以看出，刻度线从数据点向右移动。

我试图弄清楚如何转换 - 翻译蜱，但没有运气。谢谢！

这是截图。这是我的代码：

＆＃13;

// set the dimensions and margins of the graph
var margin = {top: 20, right: 20, bottom: 50, left: 50},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;

// set the ranges
var x = d3.scaleBand().range([0, width]);
var y = d3.scaleLinear().range([height, 0]);

// define the line
var valueline = d3.line().x(function(d) { return x(d.month); })
    .y(function(d) { return y(d.average); });

// append the svg obgect to the body of the page
// appends a 'group' element to 'svg'
// moves the 'group' element to the top left margin
var svg = d3.select("#chart")
  .attr("width", width + margin.left + margin.right)
  .attr("height", height + margin.top + margin.bottom)
.append("g")
  .attr("transform",
        "translate(" + margin.left + "," + margin.top + ")");

// Get the data
var data = [{"month":"january","average":0},{"month":"february","average":0},{"month":"march","average":0},{"month":"april","average":9.0},{"month":"may","average":892.0},{"month":"june","average":10.0},{"month":"july","average":92.0},{"month":"august","average":9281.0},{"month":"september","average":8402.0},{"month":"october","average":823213.0},{"month":"november","average":82.0},{"month":"december","average":0}];

x.domain(data.map(function(d) { return d.month; }));
y.domain([0, d3.max(data, function(d) { return d.average; })]);


// Add the valueline path.
console.log(valueline);
svg.append("path")
    .data([data])
    .attr("class", "line")
    .attr("d", valueline);

// Add the X Axis
svg.append("g")
    .attr("class", "e4rAxis")
    .attr("transform", "translate(0," + height + ")")
    .call(d3.axisBottom(x))
    .selectAll("text") 
      .style("text-anchor", "end")
      .attr("dx", "-.8em")
      .attr("dy", ".15em")
      .attr("transform", "rotate(-65)");

// xAxisElement.selectAll(".tick").attr("transform", "translate(0,-5)");

// Add the Y Axis
svg.append("g")
    .call(d3.axisLeft(y));

svg.selectAll("dot")
    .data(data)
  .enter().append("circle")
    .attr("r", 5)
    .attr("cx", function(d) { return x(d.month); })
    .attr("cy", function(d) { return y(d.average); });

＆＃13;

.line {
                    fill: none;
                    stroke: steelblue;
                    stroke-width: 2px;
                  }

                  .axis path, .axis line {
                    fill: none;

                    shape-rendering: crispEdges;
                  }

                  .line {

                  }

                  .area {
                    fill: steelblue;
                    opacity: 0.5;
                  }


                  .dot {
                    fill: steelblue;
                    stroke: steelblue;
                    stroke-width: 1.5px;
                  }

＆＃13;

<script src="https://d3js.org/d3.v4.min.js"></script>

<svg width="960" height="500" id="chart"></svg>

＆＃13;

Answer 1

有两种方法可以解决您的问题。

硬编码并为您的直线和圆设置一些填充，以便它们与您的x轴对齐。

 // define the line
  var valueline = d3.line().x(function(d) {
      return x(d.month) + 38; //set x padding of 38
 })
 .y(function(d) {
 return y(d.average);
  });

svg.selectAll("dot")
 .data(data)
 .enter().append("circle")
 .attr("r", 5)
 .attr("cx", function(d) {
    return x(d.month) + 38;
  })
 .attr("cy", function(d) {
    return y(d.average);
  });

JSFiddle - https://jsfiddle.net/L5dctwsz/

使用d3.scaleTime，因为您正在处理将解决问题的月份名称。

将其设置如下：

var x = d3.scaleTime().range([0, width]);

解析月份，然后设置域名：

// parse the date / time 
var parseMonth = d3.timeParse("%B");
data.forEach(function(d) {
  d.month = parseMonth(d.month);
});

x.domain(d3.extent(data, function(d) {
  return d.month;
}));

JSFiddle - https://jsfiddle.net/pm7gLn2u/

D3移动刻度以与轴对齐

1 个答案: