D3力向图的节点上的标签/文本 [英] Labels / text on the nodes of a D3 force directed graph
本文介绍了D3力向图的节点上的标签/文本的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我仍然不明白为什么下面的代码不显示其标签/文本...
我已经定义了css并在节点上移动时将属性设置为标题：
I still not understanding why the code bellow does not display its labels / text... I have defined the css and set the attribute like the title when the move is over the node:
Json：
{
"nodes":[
{"name":"t1","group":1},
{"name":"t2","group":1},
{"name":"t3","group":1},
{"name":"t4","group":1},
{"name":"hate","group":2},
{"name":"good","group":2},
{"name":"aiport","group":3},
{"name":"flight","group":3}
],
"links":[
{"source":0,"target":4,"value":4},
{"source":0,"target":5,"value":4},
{"source":1,"target":4,"value":4},
{"source":2,"target":5,"value":4},
{"source":3,"target":5,"value":4},
{"source":4,"target":6,"value":4},
{"source":5,"target":6,"value":4},
{"source":5,"target":7,"value":4}
]
}
代码：
<!DOCTYPE html>
<meta charset="utf-8">
<style>
.node {
fill: #555;
stroke: #999;
stroke-width: 1.5px;
}
.link {
stroke: #999;
stroke-opacity: .6;
}
</style>
<body>
<script src="http://d3js.org/d3.v3.min.js"></script>
<script>
var width = 1024,
height = 768;
var color = d3.scale.category20();
var force = d3.layout.force()
.charge(-120)
.linkDistance(30)
.size([width, height]);
var svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height);
d3.json("data.json", function(error, graph) {
force
.nodes(graph.nodes)
.links(graph.links)
.start();
var link = svg.selectAll("line.link")
.data(graph.links)
.enter().append("line")
.attr("class", "link")
.style("stroke-width", function(d) { return Math.sqrt(d.value); });
var node = svg.selectAll("circle.node")
.data(graph.nodes)
.enter().append("circle")
.attr("class", "node")
.attr("r", 5)
.style("fill", function(d) { return color(d.group); })
.call(force.drag);
node.append("title")
.text(function(d) { return d.name; });
node.append("text")
.text(function(d) { return d.name; });
force.on("tick", function() {
link.attr("x1", function(d) { return d.source.x; })
.attr("y1", function(d) { return d.source.y; })
.attr("x2", function(d) { return d.target.x; })
.attr("y2", function(d) { return d.target.y; });
node.attr("cx", function(d) { return d.x; })
.attr("cy", function(d) { return d.y; });
});
});
</script>
</body>
</html>
推荐答案
您要在circle元素内添加text元素-尝试运行您的代码，并使用DOM检查器查看svg。我不确定那里是否允许输入文字。而是单独添加文本元素-就像节点的另一种渲染一样：
You are adding the text element inside the circle element - try running your code and have a look at the svg with the DOM inspector. I'm not sure text is allowed there. Instead add the text elements separately - like another rendering of the nodes:
var texts = svg.selectAll("text.label")
.data(graph.nodes)
.enter().append("text")
.attr("class", "label")
.attr("fill", "black")
.text(function(d) { return d.name; });
force.on("tick", function() {
link.attr("x1", function(d) { return d.source.x; })
.attr("y1", function(d) { return d.source.y; })
.attr("x2", function(d) { return d.target.x; })
.attr("y2", function(d) { return d.target.y; });
node.attr("cx", function(d) { return d.x; })
.attr("cy", function(d) { return d.y; });
texts.attr("transform", function(d) {
return "translate(" + d.x + "," + d.y + ")";
});
});
这篇关于D3力向图的节点上的标签/文本的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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