[英]How to label a force directed Graph on d3?
我正在使用d3.js創建一個力導向圖,無法通過用文本標記節點的觀點。 我在StackOverflow和在線教程上嘗試了無數答案,但我相信問題出在我對Java基本的理解上。
我嘗試了.attr / .append / .text的不同組合,以使文本從源和目標中出現,但沒有任何反應。
這是有問題的區域:
node.append("title")
.text(function (d) {return d.target});
node.append("text")
.attr("dy", -3)
.text(function (d) {return d.source})
.attr("class", "font");
這是樣式的簡化摘錄:
<style>
.node {
fill: #ccc; /* Fill of the circles*/
stroke: #ffffff;
stroke-width: 2px;
}
.font {
font: 10px;
font-family: sans-serif;
}
.link {
stroke: #777; /* Colour of the lines*/
stroke-width: 2px;
}
</style>
這是腳本的簡化摘錄:
var width = 640,
height = 480;
var links = [
//this is an array
{source: "Germany", target: "name1"},
{source: "Germany", target: "name2"},
{source: "Nigeria", target: "name3"},
{source: "Environment", target: "name4"},
];
//setting up the nodes:
var nodes = {};
links.forEach(function(link){
link.source = nodes[link.source] ||
(nodes[link.source] = {name: link.source});
link.target = nodes[link.target] ||
(nodes[link.target] = {name: link.target});
});
//add svg to the body, this is where the actual d3 starts
var svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height);
var force = d3.layout.force() //Here we specify the paramaters
.size([width,height])
.nodes(d3.values(nodes)) //this is where we pass the nodes of our dataset
.links(links) // source of links
.on("tick", tick) //on click of the nodes
.linkDistance(300) //How far apart the nodes are
.start(); //Start to render
//add link and nodes
var link = svg.selectAll(".link")
.data(links) //get the data
.enter().append('line') //binds the data in the links array to the svg
.attr("class", "link") //css styling
var node = svg.selectAll(".node")
.data(force.nodes()) //way to reference the nodes in the force layout
.enter().append("circle")
.attr("class", "node") //attribute CSS styling
.attr("r", width * 0.03); //radius of the circle
//text element
node.append("title")
.text(function (d) {return d.target});
node.append("text")
.attr("dy", -3)
.text(function (d) {return d.source})
.attr("class", "font");
//creating the tick function from the force variable
//the "e" paramater can be used for positioning
function tick(e) {
node.attr("cx", function(d) {return d.x;})
.attr("cy", function(d) {return d.y;})
.call(force.drag); //the relative location will activate a drag once the node is clicked
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; })
}
</script>
我目前沒有收到任何錯誤消息,這使我很難調試該文件。 任何幫助表示贊賞。 謝謝!
您的代碼中有兩個問題。
第一個問題是您的node
選擇:
var node = svg.selectAll(".node")
.data(force.nodes())
.enter().append("circle")
//etc...
如您所見,這是一些圈子。 稍后,當您嘗試...
node.append("text")
...這是行不通的,因為您不能將<text>
元素附加到<circle>
元素。
最常見的解決方案是使node
成為組( <g>
)選擇,並在其上同時添加圓圈和文本。
第二個問題是節點的數據。 您的文本中包含以下內容:
node.append("text")
.text(function (d) {return d.source})
但是,數據中沒有名為source
屬性。 您擁有的唯一屬性是name
。
這是您所做的更改的代碼:
var width = 640, height = 480; var links = [ //this is an array { source: "Germany", target: "name1" }, { source: "Germany", target: "name2" }, { source: "Nigeria", target: "name3" }, { source: "Environment", target: "name4" }, ]; //setting up the nodes: var nodes = {}; links.forEach(function(link) { link.source = nodes[link.source] || (nodes[link.source] = { name: link.source }); link.target = nodes[link.target] || (nodes[link.target] = { name: link.target }); }); //add svg to the body, this is where the actual d3 starts var svg = d3.select("body").append("svg") .attr("width", width) .attr("height", height); var force = d3.layout.force() //Here we specify the paramaters .size([width, height]) .nodes(d3.values(nodes)) //this is where we pass the nodes of our dataset .links(links) // source of links .on("tick", tick) //on click of the nodes .linkDistance(300) //How far apart the nodes are .start(); //Start to render //add link and nodes var link = svg.selectAll(".link") .data(links) //get the data .enter().append('line') //binds the data in the links array to the svg .attr("class", "link") //css styling var node = svg.selectAll(".node") .data(force.nodes()) //way to reference the nodes in the force layout .enter().append("g"); node.append("circle") .attr("class", "node") .attr("r", width * 0.03); //radius of the circle node.append("text") .attr("dy", -3) .text(function(d) { return d.name }) .attr("class", "font"); //creating the tick function from the force variable //the "e" paramater can be used for positioning function tick(e) { node.attr("transform", function(d) { return "translate(" + [dx, dy] + ")" }) .call(force.drag); //the relative location will activate a drag once the node is clicked 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 { fill: #ccc; /* Fill of the circles*/ stroke: #ffffff; stroke-width: 2px; } .font { font: 10px; font-family: sans-serif; } .link { stroke: #777; /* Colour of the lines*/ stroke-width: 2px; }
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.17/d3.min.js"></script>
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