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index.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>D3 v5 force simulation</title>
</head>
<body>
<svg width="400" height="300"></svg>
<script src="https://d3js.org/d3.v5.min.js"></script>
<script>
// 1. 描画用のデータ準備
var nodesData = [
{},
{},
{},
{},
{},
{}
]
var linksData = [
{ "source": 0, "target": 1 },
{ "source": 1, "target": 4 },
{ "source": 2, "target": 3 },
{ "source": 2, "target": 5 },
{ "source": 5, "target": 1 }
]
// 2. svg要素を配置
var link = d3.select("svg")
.selectAll("line")
.data(linksData)
.enter()
.append("line")
.attr("stroke-width", 1)
.attr("stroke", "black");
var node = d3.select("svg")
.selectAll("circle")
.data(nodesData)
.enter()
.append("circle")
.attr("r", 7)
.attr("fill", "LightSalmon")
.call(d3.drag()
.on("start", dragstarted)
.on("drag", dragged)
.on("end", dragended));
// 3. forceSimulation設定
var simulation = d3.forceSimulation()
.force("link", d3.forceLink())
.force("charge", d3.forceManyBody())
.force("center", d3.forceCenter(200, 150));
simulation
.nodes(nodesData)
.on("tick", ticked);
simulation.force("link")
.links(linksData);
// 4. forceSimulation 描画更新用関数
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; });
}
// 5. ドラッグ時のイベント関数
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>
</body>
</html>