javascript - D3js hive 图 : How to label nodes?

Question

我是第一次尝试使用 D3js Hive 图，并且正在努力了解如何在轴上的每个节点旁边放置标签。请在这里查看我的 fiddle : http://jsfiddle.net/NovasTaylor/jgkqoasm/#base

使用此代码，我可以将每个节点的标签放在其适当的轴上。标签(名称)不在其各自节点附近。我需要什么代码来将标签定位在其节点附近？

nodes.append("text")
    .attr("class", "text")
    .text(function(d) {return d.name;})
    // Following is needed to place E,F on the vertical axis toward the top
    // of the graph (group=3)
    .attr("y", function(d) { 
        if (d.group === 3) {
            return -radius(d.y);
        } else {
            return radius(d.y);
        }
    })
    .attr("transform", function(d) {
        if (d.group !== 3) {
            return "rotate(" + (degrees(angle(d.group)) - 90) + ")";
        }
    })

如有任何帮助，我们将不胜感激!

干杯，

蒂姆

Answer 1

您应该在节点 circle 元素上应用相同的变换:degrees(angle(d.x)) 的旋转和 radius 的 x 位置(d.y)。此外，我会将文本包装在 g 中，然后使用这些属性定位 g 然后附加 text 并将其旋转到 g 所以文本在正确的位置:

nodes.append("g")
  .attr("class", "text")
  .attr("transform", function(d) { 
    var t = "rotate(" + degrees(angle(d.x)) + ")";
    t += "translate(" + radius(d.y) + ",0)";
    return t; 
  })
  .append("text")
  .attr("transform", function(d) { 
    var t = "rotate(" + -degrees(angle(d.x)) + ")";
    return t; 
  })
  .text(function(d) {return d.name;})

完整的工作代码:

var width = 960,
    height = 500,
    innerRadius = 40,
    outerRadius = 240;
var angle = d3.scale.ordinal().domain(d3.range(4)).rangePoints([0, 2 * Math.PI]),
    radius = d3.scale.linear().range([innerRadius, outerRadius]),
    color = d3.scale.category10().domain(d3.range(20));
var nodes = [
    {name:"A", group:1, x: 0, y: .1},
    {name:"B", group:1, x: 0, y: .9},
    {name:"C", group:2, x: 1, y: .2},
    {name:"D", group:2, x: 1, y: .3},
    {name:"E", group:3, x: 2, y: .1},
    {name:"F", group:3, x: 2, y: .8}
];
var links = [
    {source: nodes[0], target: nodes[2]},
    {source: nodes[1], target: nodes[3]},
    {source: nodes[2], target: nodes[4]},
    {source: nodes[2], target: nodes[5]},
    {source: nodes[3], target: nodes[5]},
    {source: nodes[4], target: nodes[0]},
    {source: nodes[5], target: nodes[1]}
];
var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height)
  .append("g")
    .attr("transform", "translate(" + width / 2 + "," + height / 2 + ")");
svg.selectAll(".axis")
   .data(d3.range(3))
  .enter().append("line")
    .attr("class", "axis")
    .attr("transform", function(d) { return "rotate(" + degrees(angle(d)) + ")"; })
    .attr("x1", radius.range()[0])
    .attr("x2", radius.range()[1]);

svg.selectAll(".link")
    .data(links)
  .enter().append("path")
    .attr("class", "link")
    .attr("d", d3.hive.link()
    .angle(function(d) { return angle(d.x); })
    .radius(function(d) { return radius(d.y); }))
    .style("stroke", function(d) { return color(d.source.x); });
var nodes = svg.selectAll("g.node")
    .data(nodes, function (d) {
        return d.name;
    }); 
nodes.enter()
     .append("g");
nodes.append("circle")
    .attr("class", "node")
    .attr("transform", function(d) { return "rotate(" + degrees(angle(d.x)) + ")"; })
    .attr("cx", function(d) { return radius(d.y); })
    .attr("r", 5)
    .style("fill", function(d) { return color(d.x); });
// Append name as label to each node  
nodes.append("g")
    .attr("class", "text")
	.attr("transform", function(d) { 
    	var t = "rotate(" + degrees(angle(d.x)) + ")";
    	t += "translate(" + radius(d.y) + ",0)";
    	return t; 
	})
	.append("text")
    .attr("transform", function(d) { 
    	var t = "rotate(" + -degrees(angle(d.x)) + ")";
    	return t; 
	})
    .text(function(d) {return d.name;})
	

function degrees(radians) {
  return radians / Math.PI * 180 - 90;
}

.link {
    fill: none;
    stroke-width: 1.5px;
}
.axis, .node {
    stroke: #000;
    stroke-width: 1.5px;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.4.11/d3.min.js"></script>
<script src="http://d3js.org/d3.hive.v0.min.js"></script>