折线图标签排序D3.js

Question

Tompkins表

我愿意更改不同学院的线路属性（如虚线，虚线等），并在其相应行的末尾添加学院名称。我使用嵌套函数将每个学院的所有数据分组。任何帮助将不胜感激。这是我的代码-

// Set the ranges
var x = d3.scaleLinear().range([0 , width]);
var y = d3.scaleLinear().range([0, height]);

// Define the line
var priceline = d3.line()
        .x(function(d) { return x(d.year); })
        .y(function(d) { return y(d.item_score); });

// Adds the svg canvas
var svg = d3.select("body")
        .append("svg")
        .attr("width", width + margin.left + margin.right+200)
        .attr("height", height + margin.top + margin.bottom)
        .append("g")
        .attr("transform",
                "translate(" + margin.left + "," + margin.top + ")");

// Get the data
d3.json("data.php", function(error, data) {
    data.forEach(function(d) {
        d.date = parseDate(d.year);
        d.price = +d.item_score;
    });

    // Scale the range of the data
    x.domain(d3.extent(data, function(d) { return d.year; }));

    max = d3.max(data, function(d) { return d.price; })

    y.domain([1, max]);
    // Nest the entries by symbol
    var dataNest = d3.nest()
            .key(function(d) {return d.item_name;})
            .entries(data);
   // set the colour scale
    var color = d3.scaleOrdinal(d3.schemeCategory10);

    legendSpace = width/dataNest.length; // spacing for the legend

    // Loop through each symbol / key
    dataNest.forEach(function(d,i) {

        svg.append("path")
                .attr("class", "line")
                .style("stroke", function() { // Add the colours dynamically
                    return d.color = color(d.key); })
                .attr("id", 'tag'+d.key.replace(/\s+/g, '')) // assign an ID
                .attr("d", priceline(d.values));

        // Add the Legend
        svg.append("text")
                .attr("x", width+(margin.right))  // space legend
                .attr("y", (legendSpace/2)+i*legendSpace)
                .attr("class", "legend")
                .attr("text-anchor", "end")// style the legend
                .style("fill", function() { // Add the colours dynamically
                    return d.color = color(d.key); })
                .text(d.key);

    });

});