Curious human. Interested in the mechanics of how things work.
chart = SankeyChart({
nodes: nodes,
links: data[movement]
}, {
nodeGroup: d => d.id,//.split(/\W/)[0], // take first word for color,
nodeGroups: domain,
nodeAlign, // e.g., d3.sankeyJustify; set by input above
linkColor, // e.g., "source" or "target"; set by input above
format: (f => d => `${f(d)} flights`)(d3.format(",.1~f")),
nodeStrokeWidth: 0.5,
colors: colors,
width: 1300,
height: 670
})
// Copyright 2021 Observable, Inc.
// Released under the ISC license.
// https://observablehq.com/@d3/sankey-diagram
function SankeyChart({
nodes, // an iterable of node objects (typically [{id}, …]); implied by links if missing
links // an iterable of link objects (typically [{source, target}, …])
}, {
format = ",", // a function or format specifier for values in titles
align = "justify", // convenience shorthand for nodeAlign
nodeId = d => d.id, // given d in nodes, returns a unique identifier (string)
nodeGroup, // given d in nodes, returns an (ordinal) value for color
nodeGroups, // an array of ordinal values representing the node groups
nodeLabel, // given d in (computed) nodes, text to label the associated rect
nodeTitle = d => `${d.id}\n${format(d.value)}`, // given d in (computed) nodes, hover text
nodeAlign = align, // Sankey node alignment strategy: left, right, justify, center
nodeWidth = 15, // width of node rects
nodePadding = 5, // vertical separation between adjacent nodes
nodeLabelPadding = 6, // horizontal separation between node and label
nodeStroke = "currentColor", // stroke around node rects
nodeStrokeWidth, // width of stroke around node rects, in pixels
nodeStrokeOpacity, // opacity of stroke around node rects
nodeStrokeLinejoin, // line join for stroke around node rects
linkSource = ({source}) => source, // given d in links, returns a node identifier string
linkTarget = ({target}) => target, // given d in links, returns a node identifier string
linkValue = ({value}) => value, // given d in links, returns the quantitative value
linkPath = d3Sankey.sankeyLinkHorizontal(), // given d in (computed) links, returns the SVG path
linkTitle = d => `${d.source.id} → ${d.target.id}\n${format(d.value)}`, // given d in (computed) links
linkColor = "source-target", // source, target, source-target, or static color
linkStrokeOpacity = 0.5, // link stroke opacity
linkMixBlendMode = "multiply", // link blending mode
colors = d3.schemeTableau10, // array of colors
width = 640, // outer width, in pixels
height = 400, // outer height, in pixels
marginTop = 5, // top margin, in pixels
marginRight = 1, // right margin, in pixels
marginBottom = 5, // bottom margin, in pixels
marginLeft = 1, // left margin, in pixels
} = {}) {
// Convert nodeAlign from a name to a function (since d3-sankey is not part of core d3).
if (typeof nodeAlign !== "function") nodeAlign = {
left: d3Sankey.sankeyLeft,
right: d3Sankey.sankeyRight,
center: d3Sankey.sankeyCenter
}[nodeAlign] ?? d3Sankey.sankeyJustify;
// Compute values.
const LS = d3.map(links, linkSource).map(intern);
const LT = d3.map(links, linkTarget).map(intern);
const LV = d3.map(links, linkValue);
if (nodes === undefined) nodes = Array.from(d3.union(LS, LT), id => ({id}));
const N = d3.map(nodes, nodeId).map(intern);
const G = nodeGroup == null ? null : d3.map(nodes, nodeGroup).map(intern);
console.log(G);
// Replace the input nodes and links with mutable objects for the simulation.
nodes = d3.map(nodes, (_, i) => ({id: N[i]}));
links = d3.map(links, (_, i) => ({source: LS[i], target: LT[i], value: LV[i]}));
console.log('!!!', nodes);
// Ignore a group-based linkColor option if no groups are specified.
if (!G && ["source", "target", "source-target"].includes(linkColor)) linkColor = "currentColor";
// Compute default domains.
if (G && nodeGroups === undefined) nodeGroups = G;
//console.log(nodeGroups, G, intern);
// Construct the scales.
const color = colorScale // nodeGroup == null ? null : d3.scaleOrdinal(nodeGroups, colors);
// Compute the Sankey layout.
d3Sankey.sankey()
.nodeId(({index: i}) => N[i])
.nodeAlign(nodeAlign)
.nodeWidth(nodeWidth)
.nodePadding(nodePadding)
.extent([[marginLeft, marginTop], [width - marginRight, height - marginBottom]])
({nodes, links});
// Compute titles and labels using layout nodes, so as to access aggregate values.
if (typeof format !== "function") format = d3.format(format);
const Tl = nodeLabel === undefined ? N : nodeLabel == null ? null : d3.map(nodes, nodeLabel);
const Tt = nodeTitle == null ? null : d3.map(nodes, nodeTitle);
const Lt = linkTitle == null ? null : d3.map(links, linkTitle);
// A unique identifier for clip paths (to avoid conflicts).
const uid = `O-${Math.random().toString(16).slice(2)}`;
const svg = d3.create("svg")
.attr("width", width)
.attr("height", height)
.attr("viewBox", [0, 0, width, height])
.attr("style", "max-width: 100%; height: auto; height: intrinsic;");
const node = svg.append("g")
.attr("stroke", nodeStroke)
.attr("stroke-width", nodeStrokeWidth)
.attr("stroke-opacity", nodeStrokeOpacity)
.attr("stroke-linejoin", nodeStrokeLinejoin)
.selectAll("rect")
.data(nodes)
.join("rect")
.attr("x", d => d.x0)
.attr("y", d => d.y0)
.attr("height", d => d.y1 - d.y0)
.attr("width", d => d.x1 - d.x0);
if (G) node.attr("fill", ({index: i}) => color(G[i]));
if (Tt) node.append("title").text(({index: i}) => Tt[i]);
const link = svg.append("g")
.attr("fill", "none")
.attr("stroke-opacity", linkStrokeOpacity)
.selectAll("g")
.data(links)
.join("g")
.style("mix-blend-mode", linkMixBlendMode);
if (linkColor === "source-target") link.append("linearGradient")
.attr("id", d => `${uid}-link-${d.index}`)
.attr("gradientUnits", "userSpaceOnUse")
.attr("x1", d => d.source.x1)
.attr("x2", d => d.target.x0)
.call(gradient => gradient.append("stop")
.attr("offset", "0%")
.attr("stop-color", ({source: {index: i}}) => color(G[i])))
.call(gradient => gradient.append("stop")
.attr("offset", "100%")
.attr("stop-color", ({target: {index: i}}) => color(G[i])));
link.append("path")
.attr("d", linkPath)
.attr("stroke", linkColor === "source-target" ? ({index: i}) => `url(#${uid}-link-${i})`
: linkColor === "source" ? ({source: {index: i}}) => color(G[i])
: linkColor === "target" ? ({target: {index: i}}) => color(G[i])
: linkColor)
.attr("stroke-width", ({width}) => Math.max(1, width))
.call(Lt ? path => path.append("title").text(({index: i}) => Lt[i]) : () => {});
if (Tl) svg.append("g")
.attr("font-family", "sans-serif")
.attr("font-size", 10)
.selectAll("text")
.data(nodes)
.join("text")
.attr("x", d => d.x0 < width / 2 ? d.x1 + nodeLabelPadding : d.x0 - nodeLabelPadding)
.attr("y", d => (d.y1 + d.y0) / 2)
.attr("dy", "0.35em")
.attr("text-anchor", d => d.x0 < width / 2 ? "start" : "end")
.text(({index: i}) => Tl[i])
.attr('font-size', 11)
.attr("font-family", "IBM Plex Sans");
function intern(value) {
return value !== null && typeof value === "object" ? value.valueOf() : value;
}
return Object.assign(svg.node(), {scales: {color}});
}
d3Sankey = require.alias({"d3-array": d3, "d3-shape": d3, "d3-sankey": "d3-sankey@0.12.3/dist/d3-sankey.min.js"})("d3-sankey")
import {howto} from "@d3/example-components"
colors = ["#ff595e","#ff924c","#ffca3a","#8ac926","#1982c4","#6a4c93"]
continents = ["EU", "AS", "SA", "AF", "NA", "OC"]
nodes = {
let df = domain.map(i => {return {'id': i}});
return df
}
range = ["#ff595e", "#ff924c", "#ffca3a", "#8ac926", "#1982c4", "#6a4c93",
"#E04E53", "#DD7275", "#FA8D91", "#FFA6A8",
"#FF924C", "#E0884F", "#FBA771", "#FFCBA9",
"#73AA1C", "#70A51E" ,"#9FC95C" ,"#B9E375", "#B9E375",
"#FFE9AF",
//"#FFCA3A",
"#1982C4",
"#9D88BA",
"#BCE784", "#5DD39E", "#348AA7", "#513B56",
]
domain = ["EU", "AS", "SA", "AF", "NA", "OC",
"Central and East Europe", "North Europe", "South Europe", "West Europe",
"East Asia", "Southeast Asia", "South Asia", "West Asia",
"East Africa", "North Africa", "South Africa", "West Africa", "Central Africa",
"South America",
//'Central America',
"North America",
"Australia and New Zealand",
"Trains", "Electric aircraft", "Hydrogen aircraft", "Petroleum", ]
colorScale("South America")
colorScale = d3.scaleOrdinal().domain(domain).range(range)
data = ({All: all, International: intl, Domestic: dom})
all = FileAttachment("all-sustainability-flows@8.csv").csv({typed: true})
intl = FileAttachment("all-intl-flows@8.csv").csv({typed: true})
dom = FileAttachment("all-dom-flows@8.csv").csv({typed: true})
import {Swatches} from "@d3/color-legend"
import {legend, swatches} from "@d3/color-legend"
Purpose-built for displays of data
Observable is your go-to platform for exploring data and creating expressive data visualizations. Use reactive JavaScript notebooks for prototyping and a collaborative canvas for visual data exploration and dashboard creation.
