chart = {
const svg = d3.select(DOM.svg(width, height))
.style("width", "100%")
.style("height", "auto");
const {links, nodes} = sankey(data);
svg.append("g")
.attr("stroke", "#000")
.selectAll("rect")
.data(nodes)
.enter().append("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)
.attr("fill", d => color(d.name))
.append("title")
.text(d => `${d.name}\n${format(d.value)}`);
const link = svg.append("g")
.attr("fill", "none")
.attr("stroke-opacity", 0.5)
.selectAll("g")
.data(links)
.enter().append("g")
.style("mix-blend-mode", "multiply");
if (edgeColor === "path") {
const gradient = link.append("linearGradient")
.attr("id", d => (d.uid = DOM.uid("link")).id)
.attr("gradientUnits", "userSpaceOnUse")
.attr("x1", d => d.source.x1)
.attr("x2", d => d.target.x0);
gradient.append("stop")
.attr("offset", "100%")
.attr("stop-color", d => color(d.source.name));
gradient.append("stop")
.attr("offset", "0%")
.attr("stop-color", d => color(d.target.name));
}
link.append("path")
.attr("d", d3.sankeyLinkHorizontal())
.attr("stroke", d => edgeColor === "path" ? d.uid
: edgeColor === "input" ? color(d.source.name)
: color(d.target.name))
.attr("stroke-width", d => Math.max(1, d.width));
link.append("title")
.text(d => `${d.source.name} → ${d.target.name}\n${format(d.value)}`);
svg.append("g")
.style("font", "10px sans-serif")
.selectAll("text")
.data(nodes)
.enter().append("text")
.attr("x", d => d.x0 < width / 2 ? d.x1 + 6 : d.x0 - 6)
.attr("y", d => (d.y1 + d.y0) / 2)
.attr("dy", "0.35em")
.attr("text-anchor", d => d.x0 < width / 2 ? "start" : "end")
.text(d => d.name);
return svg.node();
}
sankey = {
const sankey = d3.sankey()
.nodeWidth(15)
.nodePadding(10)
.extent([[1, 1], [width - 1, height - 5]]);
return ({nodes, links}) => sankey({
nodes: nodes.map(d => Object.assign({}, d)),
links: links.map(d => Object.assign({}, d))
});
}
format = {
const f = d3.format(",.0f");
return d => `${f(d)} TWh`;
}
color = {
const color = d3.scaleOrdinal(["#e41a1c", "#377eb8", "#ff7f00", "#f781bf", "#4daf4a", "#ffff33", "#999999", "#e41a1c", "#377eb8", "#ff7f00", "#f781bf", "#4daf4a", "#ffff33", "#999999"]);
return name => color(name.replace(/ .*/, ""));
}
data = d3.json("https://gist.githubusercontent.com/nonopp/caced05b0dcec24d92b7a6696ed86f5d/raw/48e760da436e9a62738de5de276216f5836ce48b/votosand18.json")
width = 964
height = 600
d3 = require("d3@5", "d3-sankey@0.7")
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.
