<script src="https://cdn.jsdelivr.net/npm/d3@6"></script>
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<h3>Interactive Graph</h3>
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<div id="graph-container"></div>
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<style>
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:root {
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--g-node: var(--secondary);
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--g-node-active: var(--primary);
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--g-node-inactive: var(--visited);
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--g-link: var(--outlinegray);
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--g-link-active: #5a7282;
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}
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</style>
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<script>
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const index = {{$.Site.Data.linkIndex.index}}
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const links = {{$.Site.Data.linkIndex.links}}
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const curPage = {{ strings.TrimRight "/" .Page.RelPermalink }}
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const pathColors = {{$.Site.Data.graphConfig.paths}}
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const parseIdsFromLinks = (links) => [...(new Set(links.flatMap(link => ([link.source, link.target]))))]
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const data = {
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nodes: parseIdsFromLinks(links).map(id => ({id})),
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links,
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}
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const color = (d) => {
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if (d.id === curPage || (d.id === "/" && curPage === "")) {
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return "var(--g-node-active)"
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}
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for (const pathColor of pathColors) {
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const path = Object.keys(pathColor)[0]
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const colour = pathColor[path]
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if (d.id.startsWith(path)) {
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return colour
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}
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}
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return "var(--g-node)"
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}
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const drag = simulation => {
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function dragstarted(event, d) {
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if (!event.active) simulation.alphaTarget(1).restart();
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d.fx = d.x;
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d.fy = d.y;
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}
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function dragged(event,d) {
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d.fx = event.x;
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d.fy = event.y;
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}
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function dragended(event,d) {
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if (!event.active) simulation.alphaTarget(0);
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d.fx = null;
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d.fy = null;
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}
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const enableDrag = {{$.Site.Data.graphConfig.enableDrag}}
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const noop = () => {}
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return d3.drag()
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.on("start", enableDrag ? dragstarted : noop)
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.on("drag", enableDrag ? dragged : noop)
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.on("end", enableDrag ? dragended : noop);
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}
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const height = 250
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const width = document.getElementById("graph-container").offsetWidth
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const simulation = d3.forceSimulation(data.nodes)
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.force("charge", d3.forceManyBody().strength(-20))
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.force("link", d3.forceLink(data.links)
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.id(d => d.id)
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)
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.force("center", d3.forceCenter());
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const svg = d3.select('#graph-container')
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.append('svg')
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.attr('width', width)
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.attr('height', height)
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.attr("viewBox", [-width / 2, -height / 2, width, height]);
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// legend
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const enableLegend = {{$.Site.Data.graphConfig.enableLegend}}
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if (enableLegend) {
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const legend = [
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{"Current": "var(--g-node-active)"},
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{"Note": "var(--g-node)"},
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...pathColors
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]
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legend.forEach((legendEntry, i) => {
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const key = Object.keys(legendEntry)[0]
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const colour = legendEntry[key]
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svg.append("circle").attr("cx", -width/2 + 20).attr("cy", height/2 - 30 * (i+1)).attr("r", 6).style("fill", colour)
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svg.append("text").attr("x", -width/2 + 40).attr("y", height/2 - 30 * (i+1)).text(key).style("font-size", "15px").attr("alignment-baseline","middle")
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})
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}
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// draw links between nodes
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const link = svg.append("g")
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.selectAll("line")
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.data(data.links)
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.join("line")
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.attr("class", "link")
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.attr("stroke", "var(--g-link)")
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.attr("stroke-width", 2)
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.attr("data-source", d => d.source.id)
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.attr("data-target", d => d.target.id)
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// svg groups
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const graphNode = svg.append("g")
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.selectAll("g")
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.data(data.nodes)
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.enter().append("g")
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// draw individual nodes
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const node = graphNode.append("circle")
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.attr("class", "node")
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.attr("id", (d) => d.id)
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.attr("r", (d) => {
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const numOut = index.links[d.id]?.length || 0
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const numIn = index.backlinks[d.id]?.length || 0
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return 3 + (numOut + numIn) / 4
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})
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.attr("fill", color)
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.style("cursor", "pointer")
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.on("click", (_, d) => {
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window.location.href = {{.Site.BaseURL}} + d.id;
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})
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.on("mouseover", function (_, d) {
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d3.selectAll(".node")
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.transition()
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.duration(100)
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.attr("fill", "var(--g-node-inactive)")
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const neighbours = parseIdsFromLinks([...(index.links[d.id] || []), ...(index.backlinks[d.id] || [])])
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const neighbourNodes = d3.selectAll(".node").filter(d => neighbours.includes(d.id))
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const currentId = d.id
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const links = d3.selectAll(".link").filter(d => d.source.id === currentId || d.target.id === currentId)
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// highlight neighbour nodes
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neighbourNodes
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.transition()
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.duration(200)
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.attr("fill", color)
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// highlight links
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links
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.transition()
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.duration(200)
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.attr("stroke", "var(--g-link-active)")
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// show text for self
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d3.select(this.parentNode)
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.select("text")
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.raise()
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.transition()
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.duration(200)
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.style("opacity", 1)
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}).on("mouseleave", function (_,d) {
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d3.selectAll(".node")
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.transition()
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.duration(200)
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.attr("fill", color)
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const currentId = d.id
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const links = d3.selectAll(".link").filter(d => d.source.id === currentId || d.target.id === currentId)
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links
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.transition()
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.duration(200)
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.attr("stroke", "var(--g-link)")
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d3.select(this.parentNode)
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.select("text")
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.transition()
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.duration(200)
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.style("opacity", 0)
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})
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.call(drag(simulation));
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// draw labels
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const labels = graphNode.append("text")
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.attr("dx", 12)
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.attr("dy", ".35em")
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.text((d) => d.id)
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.style("opacity", 0)
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.style("pointer-events", "none")
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.call(drag(simulation));
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// set panning
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const enableZoom = {{$.Site.Data.graphConfig.enableZoom}}
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if (enableZoom) {
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svg.call(d3.zoom()
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.extent([[0, 0], [width, height]])
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.scaleExtent([0.25, 4])
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.on("zoom", ({transform}) => {
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link.attr("transform", transform);
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node.attr("transform", transform);
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labels.attr("transform", transform);
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}));
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}
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// progress the simulation
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simulation.on("tick", () => {
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link
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.attr("x1", d => d.source.x)
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.attr("y1", d => d.source.y)
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.attr("x2", d => d.target.x)
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.attr("y2", d => d.target.y);
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node
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.attr("cx", d => d.x)
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.attr("cy", d => d.y);
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labels
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.attr("x", d => d.x)
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.attr("y", d => d.y);
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});
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</script>
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