Engineering @huggingface 🤗. Data visualization enthusiast. Creative technologist. Open for collaborations.
Published
Edited
Nov 19, 2020
5 forks
6 stars
chart = {
const zoom = d3
.zoom()
.scaleExtent([1, 32])
.extent([[margin.left, 0], [width - margin.right, height]])
.translateExtent([
[margin.left, -Infinity],
[width - margin.right, Infinity]
])
.on("zoom", zoomed);
const svg = d3
.create("svg")
.attr("viewBox", [0, 0, width, height])
.style("overflow", "visible");
const gx = svg.append("g").call(xAxis, x);
const gy = svg.append("g").call(yAxis, y);
const path = svg
.append("g")
.attr("fill", "none")
.attr("stroke", "steelblue")
.attr("stroke-width", 1.5)
.attr("stroke-linejoin", "round")
.attr("stroke-linecap", "round")
.selectAll("path")
.data(data.series)
.join("path")
.style("mix-blend-mode", "multiply")
.attr("d", d => line(d.values, x, y));
function zoomed(event) {
const xz = event.transform.rescaleX(x);
const yz = event.transform.rescaleY(y);
// updata domain on copied x scale so hover function can find the correct point
xcopy.domain(xz.domain());
ycopy.domain(yz.domain());
// redraw paths with new x zoomed scale
path.attr("d", d => line(d.values, xz, yz));
// find and redraw closest point path
const pointer = d3.pointer(event, this);
if (event.sourceEvent.type === "mousemove") {
highlightPoint(pointer, svg, path);
}
gx.call(xAxis, xz);
gy.call(yAxis, yz);
}
svg.call(hover, path);
svg.call(zoom);
return svg.node();
}
data = {
const data = d3.tsvParse(await FileAttachment("unemployment.tsv").text());
const columns = data.columns.slice(1);
return {
y: "% Unemployment",
series: data.map(d => ({
name: d.name.replace(/, ([\w-]+).*/, " $1"),
values: columns.map(k => +d[k])
})),
dates: columns.map(d3.utcParse("%Y-%m"))
};
}
function hover(svg, path) {
svg
.on("pointermove", moved)
.on("pointerenter", entered)
.on("pointerleave", left);
const dot = svg
.append("g")
.attr("display", "none")
.attr('class', 'dottext');
dot.append("circle").attr("r", 2.5);
dot
.append("text")
.attr("font-family", "sans-serif")
.attr("font-size", 10)
.attr("text-anchor", "middle")
.attr("y", -8);
function moved(event) {
event.preventDefault();
const pointer = d3.pointer(event, this);
highlightPoint(pointer, svg, path);
}
function entered() {
path.style("mix-blend-mode", null).attr("stroke", "#ddd");
dot.attr("display", null);
}
function left() {
path.style("mix-blend-mode", "multiply").attr("stroke", null);
dot.attr("display", "none");
}
}
function highlightPoint(pointer, svg, path) {
const xm = xcopy.invert(pointer[0]);
const ym = ycopy.invert(pointer[1]);
const i = d3.bisectCenter(data.dates, xm);
const s = d3.least(data.series, d => Math.abs(d.values[i] - ym));
const dot = svg.select('.dottext');
path
.attr("stroke", d => (d === s ? null : "#ddd"))
.filter(d => d === s)
.raise();
dot.attr(
"transform",
`translate(${xcopy(data.dates[i])},${ycopy(s.values[i])})`
);
dot.select("text").text(s.name);
}
height = 600
margin = ({top: 20, right: 20, bottom: 30, left: 30})
x = d3
.scaleUtc()
.domain(d3.extent(data.dates))
.range([margin.left, width - margin.right])
xcopy = x.copy()
y = d3.scaleLinear()
.domain([0, d3.max(data.series, d => d3.max(d.values))]).nice()
.range([height - margin.bottom, margin.top])
ycopy = y.copy()
xAxis = (g, x) =>
g.attr("transform", `translate(0,${height - margin.bottom})`).call(
d3
.axisBottom(x)
.ticks(width / 80)
.tickSizeOuter(0)
)
yAxis = (g, y) =>
g
.attr("transform", `translate(${margin.left},0)`)
.call(d3.axisLeft(y))
.call(g => g.select(".domain").remove())
.call(g =>
g
.select(".tick:last-of-type text")
.attr("x", 3)
.attr("text-anchor", "start")
.attr("font-weight", "bold")
.text(data.y)
)
line = (linedata, x, y) =>
d3
.line()
.defined(d => !isNaN(d))
.x((d, i) => x(data.dates[i]))
.y(d => y(d))(linedata)
d3 = require("d3@^6.1")
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.
