Tatum Network, full 1770 sample / elisabethmtatum

chart = {

let transform = d3.zoomIdentity; //ZOOM

const links = data.links.map(d => Object.create(d));

const nodes = data.nodes.map(d => Object.create(d));

const simulation = d3

.forceSimulation(nodes)

.force("link", d3.forceLink(links).id(d => d.id))

.force("charge", d3.forceManyBody().strength(-50))

.force("center", d3.forceCenter(width / 2, height / 2))

.force("collision", d3.forceCollide(d => 10));

const svg = d3

.create("svg")

.attr("height", height)

.attr("width", width);

const link = svg

.append("g")

.attr("stroke", "#999")

.attr("stroke-opacity", 0.6)

.selectAll("line")

.data(links)

.join("line")

.attr("stroke-width", d => d.pence_owed);

const node = svg

.append("g")

.attr("stroke", "#fff")

.attr("stroke-width", 1.5)

.selectAll("circle")

.data(nodes)

.join("circle")

.attr("r", d => 10)

.attr("fill", color)

.on("mouseover", tooltip_in)

.on("mouseout", tooltip_out)

.call(drag(simulation));

const textElems = svg

.append('g')

.selectAll('text')

.data(nodes)

.join('text')

.text(d => d.id)

.attr('font-size', 12)

.call(drag(simulation));

simulation.on("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);

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

textElems

.attr("x", d => d.x + 10)

.attr("y", d => d.y)

.attr("visibility", function(d) {

if (d.degree >= 10) {

return "visible";

} else {

return "hidden";

}

});

//ZOOM

const zoomRect = svg

.append("rect")

.attr("width", width)

.attr("height", height)

.style("fill", "none")

.style("pointer-events", "all");

//ZOOM

const zoom = d3

.zoom()

.on("zoom", zoomed);

//ZOOM

zoomRect.call(zoom).call(zoom.translateTo, width / 2, height / 2);

//ZOOM

function zoomed() {

transform = d3.event.transform;

node.attr("transform", d3.event.transform);

link.attr("transform", d3.event.transform);

textElems.attr("transform", d3.event.transform);

}

return svg.node();

}

md`## Tool tip`

tooltip = d3

.select("body")

.append("div") // the tooltip always "exists" as its own html div, even when not visible

.style("position", "absolute") // the absolute position is necessary so that we can manually define its position later

.style("visibility", "hidden") // hide it from default at the start so it only appears on hover

.style("background-color", "white")

.attr("class", "tooltip")

tooltip_in = function(event, d) { // pass event and d to this function so that it can access d for our data

return tooltip

.html("<h4>" + d.full_name + "<p>" + d.type + "</p>" +"<p>" + d.gender + "<p>" + d.occupation + "</p>" + "<p>" + d.location +"<p>" + "Role in court system: " + d.court + "</p>" + "</p>"+ "</h4></br><p>" + d.transactions + "</p>") // add an html element with a header tag containing the name of the node. This line is where you would add additional information like: "<h4>" + d.name + "</h4></br><p>" + d.type + "</p>" Note the quote marks, pluses and </br>--these are necessary for javascript to put all the data and strings within quotes together properly. Any text needs to be all one line in .html() here

.style("visibility", "visible") // make the tooltip visible on hover

.style("top", event.pageY + "px") // position the tooltip with its top at the same pixel location as the mouse on the screen

.style("left", event.pageX + "px"); // position the tooltip just to the right of the mouse location

}

// name a tooltip_out function to call when the mouse stops hovering

tooltip_out = function() {

return tooltip

.transition()

.duration(50) // give the hide behavior a 50 milisecond delay so that it doesn't jump around as the network moves

.style("visibility", "hidden"); // hide the tooltip when the mouse stops hovering

}

data = FileAttachment("updatefullgraph.json").json() // network data is almost always encoded in

// json format, so we tell Observable to read the data file

// as json

md`## Define slider`

import { Range } from "@observablehq/inputs"

// define the minimum start year by getting the min of the birth years

start_year = d3.min(data.nodes, d => +d.year)

end_year = d3.max(data.nodes, d => +d.year)

numberOfYears = end_year - start_year

timeScale = d3

.scaleLinear()

.domain([start_year, end_year])

.range([0, numberOfYears])

date = year_slider

viewof year_slider = Range([start_year, end_year], { step: 1, label: "Year" })

md`The slider is showing ${date}`

md `## Show and remove links and nodes based on year`

showLinkLines => {

var filterId = [];

var allLines = svg.selectAll('line');

var allNodes = svg.selectAll('circle');

// loop over each node, and update color attribute

allLines.style("stroke-opacity", function(d, i) {

return d.year <= parseInt(date) ? 0.7 : 0;

});

allLines.exit().remove();

allNodes.style('opacity', function(d, i) {

return d.year <= parseInt(date) ? 1 : 0;

});

allNodes.exit().remove();

}

md`## Define height`

height = 600

md`## Define the color scale`

color = {

const scale = d3.scaleOrdinal(d3.schemeCategory10);

return d => scale(d.type);

}

md`## Handle dragging`

drag = simulation => {

function dragstarted(event) {

if (!event.active) simulation.alphaTarget(0.3).restart();

event.subject.fx = event.subject.x;

event.subject.fy = event.subject.y;

}

function dragged(event) {

event.subject.fx = event.x;

event.subject.fy = event.y;

}

function dragended(event) {

if (!event.active) simulation.alphaTarget(0);

event.subject.fx = null;

event.subject.fy = null;

}

return d3

.drag()

.on("start", dragstarted)

.on("drag", dragged)

.on("end", dragended);

}

md`### Include D3`

d3 = require("d3@5")

Purpose-built for displays of data