Question

我正在使用Angular 7和D3JS V4来实现条形图，我需要在条形图的顶部显示y轴标签值，我已经尝试了多种方案，但未能成功，请帮助我所以。。谢谢。

 //Initialize SVG
    this.svg = d3.select("#bar-chart");

    this.width = +this.svg.attr("width") - this.margin.left - this.margin.right;
    this.height =
      +this.svg.attr("height") - this.margin.top - this.margin.bottom;
    this.g = this.svg
      .append("g")
      .attr(
        "transform",
        "translate(" + this.margin.left + "," + this.margin.top + ")"
      );

    //Initialize Axis
    this.x = d3Scale
      .scaleBand()
      .rangeRound([0, this.width])
      .padding(0.9);
    this.y = d3Scale.scaleLinear().rangeRound([this.height, 0]);
    this.x.domain(this.totalStores.map(d => d.store));
    this.y.domain([0, d3Array.max(this.totalStores.map(d => d.storeCount))]);

    //Draw Axis
    this.g
      .append("g")

      .attr("transform", "translate(0," + this.height + ")")
      .call(d3Axis.axisBottom(this.x));
    this.g
      .append("g")

      .call(d3Axis.axisLeft(this.y).ticks(4))
      .append("text");

    //Draw Bars
    this.g
      .selectAll(".bar")
      .data(this.totalStores)
      .enter()
      .append("rect")
      .attr("class", "bar")
      .attr("x", d => this.x(d.store))
      .attr("y", d => this.y(d.storeCount))
      .attr("width", this.x.bandwidth())
      .attr("height", d => this.height - this.y(d.storeCount));

jsFiddle

Answer 1

只需将x和y值传递给文本

// Get the y axis value on top
this.g
        .selectAll("text.bar")
        .data(this.totalStores)
        .enter()
        .append("text")
        .attr("class", "yAxis-label")
        .attr("text-anchor", "middle")
        .attr("fill", "#70747a")
        .attr("x", d => this.x(d.store))
        .attr("y", d => this.y(d.storeCount) - 5)
        .text(d => d.storeCount);

Answer 2

我这样画我的y轴：

  drawYAxis(g: d3.Selection<SVGElement, {}, null, undefined> = this.yAxis) {
    g.selectAll(".label").remove();
    return g.call(
            d3.axisLeft(this.y)
              .ticks(getTickFrequency(this.axes[1].format, this.y.domain()))
              .tickSizeInner(this.x.range()[0] - this.x.range()[1])
              .tickSizeOuter(0)
              .tickFormat(Formatter.short(this.axes[1].format)))
        .call(g => g.select(".tick:last-of-type text")
              .clone()
              .classed("label", true)
              .attr("x", 5 - this.margin.left)
              .text(this.axes[1].label));
  }

因此，我像您一样绘制y轴，使用d3.axisLeft和一些其他选项，然后选择附加到类text的最后一个<g>的{{1}} ，然后复制元素及其样式等。然后将其向左移动一点，给它一个不同的类，然后将文本设置为预定义的标签。

类似的事情应该起作用。请记住，您可以添加不同的类并更改位置以更好地满足您的需求

tick

D3 JS条形图，在条形顶部显示y轴标签值

2 个答案: