cv_network.js

const data_json = document.querySelector("script[type='application/json']").textContent;
const { edges, nodes } = JSON.parse(data_json);

class MyHandler extends Paged.Handler {
    constructor(chunker, polisher, caller) {
        super(chunker, polisher, caller);
    }

    afterRendered() {
        plot_network();
    }
}
Paged.registerHandlers(MyHandler);

function plot_network() {
    const { width, height } = document.querySelector("svg#cv_network_viz").getBoundingClientRect();

    const svg = d3.select("svg#cv_network_viz")
        .attr("width", width)
        .attr("height", height);

    const unique_sections = [...new Set(nodes.map(d => d.section))];
    const color_scale = d3.scaleOrdinal()
        .domain(unique_sections)
        .range(d3.schemeSet2);

    const edge_color = d3.scaleLinear()
        .domain(d3.extent(edges, d => d.year));

    const simulation = d3.forceSimulation(nodes)
        .force("link", d3.forceLink(edges).id(d => d.id))
        .force("charge", d3.forceManyBody())
        .force("center", d3.forceCenter(width / 2, height / 2))
        .on("tick", ticked);

    const g = svg.append("g");

    const link = g
        .selectAll("line")
        .data(edges)
        .enter().append("line")
        .attr("stroke", d => d3.interpolateGreys(edge_color(d.year)))
        .attr("stroke-width", 0.5);

    const node = g
        .attr("stroke", "#fff")
        .attr("stroke-width", 1.5)
        .selectAll("circle")
        .data(nodes)
        .enter().append("circle")
        .attr("r", 5)
        .attr("fill", d => color_scale(d.section))
        .call(drag(simulation));

    node.append("title")
        .text(d => `${d.section}\n${d.title}`);

    svg.call(d3.zoom()
        .extent([[0, 0], [width, height]])
        .scaleExtent([1, 8])
        .on("zoom", zoomed));

    function ticked() {
        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);

        node
            .attr("cx", d => d.x)
            .attr("cy", d => d.y);
    }

    function zoomed() {
        g.attr("transform", d3.event.transform);
    }

    function drag(simulation) {

        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;
        }

        return d3.drag()
            .on("start", dragstarted)
            .on("drag", dragged)
            .on("end", dragended);
    }

}