Non-working — can you help me figure this out?
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Modifying a Force Layout on D3 v4
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license: gpl-3.0 |
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<!DOCTYPE html> | |
<meta charset="utf-8"> | |
<style> | |
.link { | |
stroke: #000; | |
stroke-width: 1.5px; | |
} | |
.node { | |
fill: #000; | |
stroke: #fff; | |
stroke-width: 1.5px; | |
} | |
.node.a { fill: #1f77b4; } | |
.node.b { fill: #ff7f0e; } | |
.node.c { fill: #2ca02c; } | |
</style> | |
<body> | |
<script src="https://d3js.org/d3.v4.min.js"></script> | |
<script> | |
var width = 960, | |
height = 500; | |
var color = d3.scaleOrdinal(d3.schemeCategory20); | |
var nodes = [], | |
links = []; | |
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)); | |
var svg = d3.select("body").append("svg") | |
.attr("width", width) | |
.attr("height", height); | |
var node = svg.selectAll(".node"), | |
link = svg.selectAll(".link"); | |
// 1. Add three nodes and three links. | |
setTimeout(function() { | |
var a = {id: "a"}, b = {id: "b"}, c = {id: "c"}; | |
nodes.push(a, b, c); | |
links.push({source: a, target: b}, {source: a, target: c}, {source: b, target: c}); | |
start(); | |
}, 0); | |
// 2. Remove node B and associated links. | |
setTimeout(function() { | |
nodes.splice(1, 1); // remove b | |
links.shift(); // remove a-b | |
links.pop(); // remove b-c | |
start(); | |
}, 3000); | |
// Add node B back. | |
setTimeout(function() { | |
var a = nodes[0], b = {id: "b"}, c = nodes[1]; | |
nodes.push(b); | |
links.push({source: a, target: b}, {source: b, target: c}); | |
start(); | |
}, 6000); | |
function start() { | |
link = link.data(links, function(d) { return d.source.id + "-" + d.target.id; }) | |
.enter().append("line") | |
.merge(link) | |
.attr("class", "link"); | |
link.exit().remove(); | |
node = node.data(nodes, function(d) { return d.id;}) | |
.enter().append("circle") | |
.merge(node) | |
.attr("class", function(d) { return "node " + d.id; }).attr("r", 8); | |
node.exit().remove(); | |
simulation | |
.nodes(nodes) | |
.on("tick", tick); | |
simulation.force("link") | |
.links(links); | |
} | |
function tick() { | |
node.attr("cx", function(d) { return d.x; }) | |
.attr("cy", function(d) { return d.y; }) | |
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> |
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