我有一个带有彩色节点的力图,我正在尝试添加标签。现在它有标签,但它是浏览器原生的小巧,难以读取的标签。如何添加更容易看到的标签?
<svg width="960" height="600"></svg>
<script>
var svg = d3.select("svg"),
width = +svg.attr("width"),
height = +svg.attr("height");
var color = d3.scaleOrdinal(d3.schemeCategory10);
var simulation = d3.forceSimulation()
.force("link", d3.forceLink().id(function(d) { return d.id; }))
.force("charge", d3.forceManyBody())
.force("center", d3.forceCenter(width / 2, height / 2));
d3.json("got_relationships.json", function(error, graph) {
if (error) throw error;
var link = svg.append("g")
.attr("class", "links")
.selectAll("line")
.data(graph.links)
.enter().append("line")
.attr("stroke-width", function(d) { return Math.sqrt(d.value); });
var node = svg.append("g")
.attr("class", "nodes")
.selectAll("circle")
.data(graph.nodes)
.enter().append("circle")
.attr("r", 5)
.attr("fill", function(d) { return color(d.group); })
.call(d3.drag()
.on("start", dragstarted)
.on("drag", dragged)
.on("end", dragended));
node.append("title")
.text(function(d) { return d.id; });
simulation
.nodes(graph.nodes)
.on("tick", ticked);
simulation.force("link")
.links(graph.links);
function ticked() {
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; });
}
});
function dragstarted(d) {
if (!d3.event.active) simulation.alphaTarget(0.3).restart();
d.fx = d.x;
d.fy = d.y;
}
function dragged(d) {
d.fx = d3.event.x;
d.fy = d3.event.y;
}
function dragended(d) {
if (!d3.event.active) simulation.alphaTarget(0);
d.fx = null;
d.fy = null;
}
</script>
答案 0 :(得分:5)
“标签”和“工具提示”之间存在混淆。传统上,我们将“标签”命名为在没有用户交互的情况下显示在节点旁边的文本,并且我们将“工具提示”命名为当用户与节点交互时显示的文本(例如,悬停节点)。
因此,如果您的意思是“标签”,这是一个解决方案:将节点附加为组...
var node = svg.selectAll(".node")
.data(graph.nodes)
.enter().append("g")
.attr("class", "node")
.call(d3.drag().on("start", dragstarted)
.on("drag", dragged)
.on("end", dragended));
将圆圈和标签(作为<text>
元素)附加到它们:
node.append("circle")
.attr("r", 5)
.attr("fill", function(d) { return color(d.group); });
node.append("text")
.attr("dx", 6)
.text(function(d) { return d.id; });
以下是使用(大部分)代码的演示,其中包含补充数据:
var graph = {
nodes:[
{"id": "A", "group": 1},
{"id": "B", "group": 2},
{"id": "C", "group": 2},
{"id": "D", "group": 2},
{"id": "E", "group": 2},
{"id": "F", "group": 3},
{"id": "G", "group": 3},
{"id": "H", "group": 3},
{"id": "I", "group": 3}
],
links:[
{"source": "A", "target": "B", "value": 1},
{"source": "B", "target": "C", "value": 1},
{"source": "A", "target": "D", "value": 1},
{"source": "H", "target": "E", "value": 1},
{"source": "I", "target": "F", "value": 1},
{"source": "A", "target": "G", "value": 1},
{"source": "B", "target": "H", "value": 1},
{"source": "A", "target": "I", "value": 1},
]
};
var svg = d3.select("svg"),
width = +svg.attr("width"),
height = +svg.attr("height");
var color = d3.scaleOrdinal(d3.schemeCategory20);
var simulation = d3.forceSimulation()
.force("link", d3.forceLink().id(function(d) { return d.id; }).distance(40))
.force("charge", d3.forceManyBody())
.force("center", d3.forceCenter(width / 2, height / 2));
var link = svg.append("g")
.attr("class", "links")
.selectAll("line")
.data(graph.links)
.enter().append("line")
.attr("stroke-width", function(d) { return Math.sqrt(d.value); });
var node = svg.selectAll(".node")
.data(graph.nodes)
.enter().append("g")
.attr("class", "node")
.call(d3.drag()
.on("start", dragstarted)
.on("drag", dragged)
.on("end", dragended));
node.append("circle")
.attr("r", 5)
.attr("fill", function(d) { return color(d.group); });
node.append("text")
.attr("dx", 6)
.text(function(d) { return d.id; });
simulation
.nodes(graph.nodes)
.on("tick", ticked);
simulation.force("link")
.links(graph.links);
function ticked() {
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("transform", function(d) {
return "translate(" + d.x + "," + d.y + ")";
});
}
function dragstarted(d) {
if (!d3.event.active) simulation.alphaTarget(0.3).restart();
d.fx = d.x;
d.fy = d.y;
}
function dragged(d) {
d.fx = d3.event.x;
d.fy = d3.event.y;
}
function dragended(d) {
if (!d3.event.active) simulation.alphaTarget(0);
d.fx = null;
d.fy = null;
}
.links line {
stroke: #999;
stroke-opacity: 0.6;
}
.node circle {
stroke: #fff;
stroke-width: 1.5px;
}
.node text{
fill: #666;
font-family: Helvetica
}
<svg width="400" height="300"></svg>
<script src="https://d3js.org/d3.v4.min.js"></script>