这里是使用d3.v5的图表上yAxis的代码:
let x = d3.scaleTime()
.domain(d3.extent(data, d => d.date))
.range([margin.left, width - margin.right])
let y = d3.scaleSymlog()
.domain([0, d3.max(data, d => d.Confirmed)]).nice()
.range([height - margin.bottom, margin.top])
let line = d3.line()
.defined(d => !isNaN(d.value))
.x(d => x(d.date))
.y(d => y(d.value))
let xAxis = g => g
.attr("transform", `translate(0,${height - margin.bottom})`)
.call(d3.axisBottom(x).ticks(width / 80).tickSizeOuter(0))
let yAxis = g => g
.attr("transform", `translate(${margin.left},0)`)
.call(d3.axisLeft(y))
.call(g => g.select(".domain").remove())
.call(g => g.select(".tick:last-of-type text").clone()
.attr("x", 3)
.attr("text-anchor", "start")
.attr("font-weight", "bold")
.text(data.y))
let svg = d3.select('#MultiLineLogChart').select("svg")
svg.attr("viewBox", [0, 0, width, height])
.attr("fill", "none")
.attr("stroke-linejoin", "round")
.attr("stroke-linecap", "round");
svg.append("g")
.call(xAxis);
svg.append("g")
.call(yAxis);
这是我的对数图的链接:https://covid19wiki.info/country/Canada
您看到的问题是Symlog秤的持续问题:https://github.com/d3/d3-scale/issues/162
您可以在这个简单的演示中看到它:
const svg = d3.select("svg");
const scale = d3.scaleSymlog()
.domain([0, 100000])
.range([140, 10]);
const axis = d3.axisLeft(scale).ticks(4)(svg.append("g").attr("transform", "translate(50,0)"));
<script src="https://d3js.org/d3.v5.min.js"></script>
<svg></svg>
这些是可能的解决方案:
axis.tickValues
的报价值列表;最后一个选项似乎很俗气,但到目前为止,这是最简单的,并且鉴于您的最高价值如此之大,从视觉上讲,它不会对数据产生任何影响。这是:
const svg = d3.select("svg");
const scale = d3.scaleLog()
.domain([1, 100000])
.range([140, 10]);
const axis = d3.axisLeft(scale).ticks(4).tickFormat(d => d3.format("")(d))(svg.append("g").attr("transform", "translate(50,0)"));
<script src="https://d3js.org/d3.v5.min.js"></script>
<svg></svg>