Published
Edited
Nov 16, 2020
1 fork
2 stars
md`# knowledge graph`
d3 = require("d3@6")
height = Math.min(500, width * 0.6);
centerX = width / 2;
centerY = height / 2;
graph = ({
nodes: Array.from({length:8}, () => ({})),
links: [
{source: 1, target: 0},
{source: 2, target: 0},
{source: 3, target: 0},
{source: 4, target: 0},
{source: 5, target: 0},
{source: 6, target: 0},
{source: 7, target: 0},
]
})
{
const svg = d3.create("svg").attr("viewBox", [0, 0, width, height]),
link = svg
.selectAll(".link")
.data(graph.links)
.join("line"),
node = svg
.selectAll(".node")
.data(graph.nodes)
.join("g");
node.append("circle")
.attr("r", 12)
.attr("cursor", "move")
.attr("fill", "#ccc")
.attr("stroke", "#000")
.attr("stroke-width", "1.5px");
node.append("text").attr("dy", 25).text(function(d) {return d.index})
yield svg.node();
const simulation = d3
.forceSimulation()
.nodes(graph.nodes)
.force("link", d3.forceLink(graph.links).distance(100))
.force("charge", d3.forceManyBody().strength(-400))
.force("center", d3.forceCenter(width / 2, height / 2))
.stop();
for (let i = 0, n = Math.ceil(Math.log(simulation.alphaMin()) / Math.log(1 - simulation.alphaDecay())); i < n; ++i) {
simulation.tick();
}
link
.attr("x1", d => d.source.x)
.attr("y1", d => d.source.y)
.attr("x2", d => d.target.x)
.attr("y2", d => d.target.y)
.attr("stroke", "#000")
.attr("stroke-width", "1.5px")
node
.attr("transform", function (d) {return "translate(" + d.x + ", " + d.y + ")";});
}
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