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Display nodes with d3
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<!DOCTYPE html> | |
<html lang="en"> | |
<head> | |
<title>Nodes</title> | |
<meta charset="utf-8" /> | |
<script src="https://code.jquery.com/jquery-3.3.1.min.js" integrity="sha256-FgpCb/KJQlLNfOu91ta32o/NMZxltwRo8QtmkMRdAu8=" crossorigin="anonymous"></script> | |
<script src="https://d3js.org/d3.v4.min.js"></script> | |
<script src="https://d3js.org/d3-selection-multi.v1.js"></script> | |
<style> | |
#canvas { | |
background-color: #fff; | |
} | |
.links line { | |
stroke: #999; | |
stroke-opacity: 0.6; | |
} | |
.nodes circle { | |
stroke: #fff; | |
stroke-width: 4px; | |
} | |
</style> | |
</head> | |
<body> | |
<svg id="canvas" width="960" height="600"></svg> | |
<script type="text/javascript" src="main.js"></script> | |
</body> | |
</html> |
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const svg = d3.select("svg"), | |
width = +svg.attr("width"), | |
height = +svg.attr("height"); | |
function color(d) { | |
switch (d.group) { | |
case 2: return '#0498ff'; | |
case 3: return '#f7ba00'; | |
default: return '#61d836'; | |
} | |
} | |
const simulation = d3.forceSimulation() | |
.force("link", d3.forceLink().distance(200).id(function(d) { return d.id; })) | |
.force("charge", d3.forceManyBody().strength(-300)) | |
.force("center", d3.forceCenter(width / 2, height / 2)); | |
d3.json("./nodes.json", function(error, graph) { | |
if (error) throw error; | |
const link = svg.append("g") | |
.attr("class", "links") | |
.selectAll("line") | |
.data(graph.links) | |
.enter().append("line") | |
.attr("marker-end", "url(#arrowhead)") | |
.attr("stroke-width", function(d) { return Math.sqrt(d.value); }); | |
const node = svg.append("g") | |
.attr("class", "nodes") | |
.selectAll("g") | |
.data(graph.nodes) | |
.enter().append("g"); | |
const circles = node.append("circle") | |
.attr("r", 20) | |
.attr("fill", function(d) { return color(d); }) | |
.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("transform", function(d) { | |
return "translate(" + d.x + "," + d.y + ")"; | |
}); | |
} | |
}); | |
function dragstarted(d) { | |
if (!d3.event.active) simulation.alphaTarget(0.8).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; | |
} |
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{ | |
"nodes": [ | |
{"id": "1", "group": 1}, | |
{"id": "2", "group": 1}, | |
{"id": "3", "group": 1}, | |
{"id": "4", "group": 1}, | |
{"id": "5", "group": 1} | |
], | |
"links": [ | |
{"source": "3", "target": "5", "value": "1"}, | |
{"source": "3", "target": "4", "value": "1"}, | |
{"source": "2", "target": "4", "value": "1"}, | |
{"source": "1", "target": "5", "value": "1"}, | |
{"source": "1", "target": "3", "value": "1"} | |
] | |
} |
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