我现在正在尝试创建一个条形图,但目前我面临一个问题,即我的条形与数据相比没有正确缩放。这是我在 D3 中的代码:
modules
您可以在此图像上看到结果,其中第一个条形指示接近 10 而不是 102 的值:
你能帮我知道在这种情况下如何固定轴,以便 y 轴上的值可以对齐吗?
谢谢!
答案 0 :(得分:1)
Y 刻度的方向(倒置)与 SVG 的(倒置)相反。
可以通过切换y
s的height
和<rect>
属性的值来解决:
third_svg.selectAll("rect")
.data(third_data)
.enter()
.append("rect")
.attr('y', d => third_yScale(d))
.attr("height", d => third_height - third_padding - third_yScale(d))
...
在代码段中查看它的工作原理:
const third_width = 1000;
const third_height = 450;
const third_padding = 30;
const third_countries = ["Australia", "Austria", "Denmark", "Netherlands","New Zealand", "Norway", "Sweden", "UK","USA","Japan","Poland","Finland","Italy","France","Belgium"]
const third_data = [102, 39, 81, 50, 61, 79, 81, 77, 59, 64, 56, 65, 57, 85, 50];
const third_xScale = d3.scaleBand()
.domain(d3.range(third_data.length))
.rangeRound([third_padding ,third_width])
.paddingInner(0.1);
const third_yScale = d3.scaleLinear()
.domain([0, d3.max(third_data)])
.range([third_height - third_padding, third_padding]);
const third_xAxis = d3.axisBottom()
.scale(third_xScale).tickFormat(function(i) {return third_countries[i];})
const third_yAxis = d3.axisLeft()
.scale(third_yScale).ticks(5);
const third_svg = d3.select("#chart3")
.append("svg")
.attr("width", third_width)
.attr("height", third_height);
third_svg.selectAll("rect")
.data(third_data)
.enter()
.append("rect")
.attr("x", (d, i) => third_xScale(i))
.attr('y', d => third_yScale(d))
.attr("height", d => third_height - third_padding - third_yScale(d))
.attr("width", third_xScale.bandwidth())
.attr("fill", d => `rgb(0, 0, ${d * 2})`);
//Create "Food waste per capita (kg/year)" on Y Axis
third_svg.append('text')
.attr('x', 5)
.attr('y', 20)
.attr('text-anchor', 'left')
.style('font-family', 'Helvetica')
.style('font-size', 'small')
.text('Food waste per capita (kg/year)');
third_svg.append("g")
.attr("class", "axis")
.attr("transform", "translate(" + third_padding + ",0)")
.call(third_yAxis);
third_svg.append("g")
.attr("class", "axis")
.attr("transform", "translate(0,"+ (third_height - third_padding) + ")")
.call(third_xAxis);
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/6.7.0/d3.min.js"></script>
<div id="chart3" />