在多线图表中，在每条线的末尾我想要一个小圆圈和终点的值使用 d3.js

Question

<!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，但我想在每行的末尾画一个小圆圈以及末尾的值 point.I dint 在这里添加我的数据文件，并且我是 d3.js 的新手所以建议我与想法。谢谢

请查找 tsv 数据集 here

Answer 1

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.      
      })

工作代码here

在多线图表中，在每条线的末尾我想要一个小圆圈和终点的值使用 d3.js

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

javascript

d3.js

nvd3.js