我已经在我的应用程序中实现了D3v3多折线图。由于我是D3图表的新手，因此寻找了一些在线资源，并提出了这个建议。最初，我必须在X轴上显示Years，并且它工作正常。该小提琴将其显示（https://jsfiddle.net/yasirunilan/tz57wc29/13/）。然后根据一个新的要求，我需要在X轴上显示月份的数据分布，不同之处在于X轴并不总是从一月份开始。如数据集所述，它可能从一年的10月开始到一年的10月到次年的9月开始。在这种情况下，我在图表中显示折线和X轴值时遇到了问题。有人可以为这个问题提供指导吗？
提琴：https://jsfiddle.net/yasirunilan/v160sr4z/10/
var data = [{
name: "USA",
values: [{
date: "October",
price: "100"
},
{
date: "November",
price: "110"
},
{
date: "December",
price: "145"
},
{
date: "January",
price: "241"
},
{
date: "February",
price: "101"
},
{
date: "March",
price: "90"
},
{
date: "April",
price: "120"
},
{
date: "May",
price: "135"
},
{
date: "June",
price: "99"
},
{
date: "July",
price: "105"
},
{
date: "August",
price: "101"
},
{
date: "September",
price: "106"
}
]
},
{
name: "UK",
values: [{
date: "October",
price: "130"
},
{
date: "November",
price: "120"
},
{
date: "December",
price: "115"
},
{
date: "January",
price: "220"
},
{
date: "February",
price: "100"
},
{
date: "March",
price: "140"
},
{
date: "April",
price: "90"
},
{
date: "May",
price: "235"
},
{
date: "June",
price: "160"
},
{
date: "July",
price: "86"
},
{
date: "August",
price: "201"
},
{
date: "September",
price: "140"
}
]
}
];
const margin = 80;
const width = 1000 - 2 * margin;
const height = 550 - 2 * margin;
var duration = 250;
var lineOpacity = "0.25";
var lineOpacityHover = "0.85";
var otherLinesOpacityHover = "0.1";
var lineStroke = "1.5px";
var lineStrokeHover = "2.5px";
var circleOpacity = '0.85';
var circleOpacityOnLineHover = "0.25"
var circleRadius = 3;
var circleRadiusHover = 6;
/* Format Data */
var parseDate = d3.time.format("%B");
data.forEach(function(d) {
d.values.forEach(function(d) {
d.date = parseDate.parse(d.date);
d.price = +d.price;
});
});
/* Scale */
var xScale = d3.time.scale()
.domain(d3.extent(data[0].values, d => d.date))
.range([0, width - margin]);
var yScale = d3.scale.linear()
.domain([0, d3.max(data[0].values, d => d.price)])
.range([height - margin, 0]);
// var color = d3.scale.ordinal(d3.schemeCategory10);
var color = d3.scale.category10();
/* Add SVG */
var svg = d3.select("svg")
.attr("width", (width + margin) + "px")
.attr("height", (height + margin) + "px")
.append('g')
.attr("transform", `translate(${margin}, ${margin})`);
/* Add line into SVG */
var line = d3.svg.line()
.x(d => xScale(d.date))
.y(d => yScale(d.price));
let lines = svg.append('g')
.attr('class', 'lines');
lines.selectAll('.line-group')
.data(data).enter()
.append('g')
.attr('class', 'line-group')
.on("mouseover", function(d, i) {
svg.append("text")
.attr("class", "title-text")
.style("fill", color(i))
.text(d.name)
.attr("text-anchor", "middle")
.attr("x", (width - margin) / 2)
.attr("y", 5);
})
.on("mouseout", function(d) {
svg.select(".title-text").remove();
})
.append('path')
.attr('class', 'line')
.attr('d', d => line(d.values))
.style('stroke', (d, i) => color(i))
.style('opacity', lineOpacity)
.on("mouseover", function(d) {
d3.selectAll('.line')
.style('opacity', otherLinesOpacityHover);
d3.selectAll('.circle')
.style('opacity', circleOpacityOnLineHover);
d3.select(this)
.style('opacity', lineOpacityHover)
.style("stroke-width", lineStrokeHover)
.style("cursor", "pointer");
})
.on("mouseout", function(d) {
d3.selectAll(".line")
.style('opacity', lineOpacity);
d3.selectAll('.circle')
.style('opacity', circleOpacity);
d3.select(this)
.style("stroke-width", lineStroke)
.style("cursor", "none");
});
/* Add circles in the line */
lines.selectAll("circle-group")
.data(data).enter()
.append("g")
.style("fill", (d, i) => color(i))
.selectAll("circle")
.data(d => d.values).enter()
.append("g")
.attr("class", "circle")
.on("mouseover", function(d) {
d3.select(this)
.style("cursor", "pointer")
.append("text")
.attr("class", "text")
.text(`${d.price}`)
.attr("x", d => xScale(d.date) + 5)
.attr("y", d => yScale(d.price) - 10);
})
.on("mouseout", function(d) {
d3.select(this)
.style("cursor", "none")
.transition()
.duration(duration)
.selectAll(".text").remove();
})
.append("circle")
.attr("cx", d => xScale(d.date))
.attr("cy", d => yScale(d.price))
.attr("r", circleRadius)
.style('opacity', circleOpacity)
.on("mouseover", function(d) {
d3.select(this)
.transition()
.duration(duration)
.attr("r", circleRadiusHover);
})
.on("mouseout", function(d) {
d3.select(this)
.transition()
.duration(duration)
.attr("r", circleRadius);
});
var xAxis = d3.svg.axis().scale(xScale)
.orient("bottom").tickFormat(d3.time.format("%B")).tickSize(1);
var yAxis = d3.svg.axis().scale(yScale)
.orient("left").tickSize(1);
svg.append("g")
.attr("class", "x axis")
.attr("transform", `translate(0, ${height-margin})`)
.call(xAxis.ticks(d3.time.year));
svg.append("g")
.attr("class", "y axis")
.call(yAxis)
.append('text')
.attr("y", 15)
.attr("transform", "rotate(-90)")
.attr("fill", "#000")
.attr('text-anchor', 'middle')
.text("No. of Employees");
答案 0 :(得分：2)
一种可能的解决方案是像这样在date字段中添加年份
{
date: "2010-October",
price: "100"
}
如果您不想显示年份，则可以是任意的，只需确保在12月之后将其增加1。
然后将var parseDate = d3.time.format("%B");替换为var parseDate = d3.time.format("%Y-%B");
也将.call(xAxis.ticks(d3.time.year));替换为.call(xAxis.ticks(d3.time.months));
这是小提琴：https://jsfiddle.net/p68z0bqo/
编辑：如果您不能手动添加年份，则可以尝试自动执行以下操作：
var parseDate = d3.time.format("%Y-%B");
data.forEach(function(d) {
var year = 2000;
d.values.forEach(function(d) {
if (d.date === 'January') year++;
d.date = parseDate.parse(year.toString() + '-' + d.date);
d.price = +d.price;
});
});
仅当所有月份都存在（没有间隔）并且一月的确切表示为"January"（即大小写相同）时，此代码才有效。