在多行图表中，在每一行的末尾，我想要一个小圆圈和使用d3.js的端点值

In multiline chart, at the end of each line i want a small circle and the value of the end point using d3.js

本文关键字：js 端点 d3 一行 我想要 一个      更新时间：2023-09-26

<!DOCTYPE html>
<meta charset="utf-8">
<style> /* set the CSS */
body { font: 12px Arial;}
path { 
    stroke: steelblue;
    stroke-width: 2;
    fill: none;
}
.axis path,
.axis line {
    fill: none;
    stroke: green;
    stroke-width: 1;
    shape-rendering: crispEdges;
}
</style>
<body>
<script src="d3.min.js"></script>
<script>
// Set the dimensions of the canvas / graph
var margin = {top: 30, right: 20, bottom: 30, left: 50},
    width = 600 - margin.left - margin.right,
    height = 270 - margin.top - margin.bottom;
var parseDate = d3.time.format("%Y-%m-%d").parse;
//2015-06-20
// Set the ranges
var x = d3.time.scale().range([0, width]);
var y = d3.scale.linear().range([height, 0]);
// Define the axes
var xAxis = d3.svg.axis().scale(x)
    .orient("bottom").ticks(10);
var yAxis = d3.svg.axis().scale(y)
    .orient("left").ticks(5);
// Define the line 
var priceline = d3.svg.line().interpolate("basis")
    .x(function(d) { console.log(d.T1); return x(d.T1); })
    .y(function(d) { return y(d.NATURE_QUERY); });
    
// Adds the svg canvas
var svg = d3.select("body")
    .append("svg")
        .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
d3.csv("datatest.csv", function(error, data) {  
    data.forEach(function(d) {
      console.log(d.T1);
      d.T1 = parseDate(d.T1);
    }); 
    // Scale the range of the data
    x.domain(d3.extent(data, function(d) { return d.T1; }));
    y.domain([0, d3.max(data, function(d) { return d.NATURE_QUERY; })]); 
    // Nest the entries by symbol
    var dataNest = d3.nest()
        .key(function(d) {return d.CLOSING_DEPT;})
        .entries(data);
    console.log(dataNest);
    // Loop through each symbol / key
    dataNest.forEach(function(d) {
        svg.append("path")
            .attr("class", "line")
            .attr("d", priceline(d.values)); 
    });
    // Add the X Axis
    svg.append("g")
        .attr("class", "x axis")
        .attr("transform", "translate(0," + height + ")")
        .call(xAxis);
    // Add the Y Axis
    svg.append("g")
        .attr("class", "y axis")
        .call(yAxis);
});
</script>
</body>
这是我的代码，但我想在每一行的末尾画一个小圆圈，并附上端点的值。我不得不在这里添加我的数据文件，而且我是d3.js的新手，所以建议我使用这些想法。谢谢

请在此处找到tsv数据集

你可以这样做：

 dataNest.forEach(function(d){
        //iterate over all the data for line to get the last point of a line.
        var k = d.values
        var last = k[k.length -1];//get the last value of the line
        svg.append("circle")
        .attr("cx", function(d){return x(last.T1);})//make a circle at the last point
        .attr("cy", function(d){return y(last.NATURE_QUERY);})
        .attr("r", 4);
        //make a text 
        svg.append("text")
        .attr("x", function(){return x(last.T1) + 20;})
        .attr("y", function(){return y(last.NATURE_QUERY);})
        .text(function(){return last.CLOSING_DEPT;})  //set the text you want to display.      
      })

此处的工作代码

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