Published
Edited
Aug 1, 2021
chart = {
const svg = d3.create("svg")
.attr("viewBox", [0, 0, width, height]);
const updateBars = bars(svg);
const updateAxis = axis(svg);
const updateLabels = labels(svg);
const updateTicker = ticker(svg);
invalidation.then(() => svg.interrupt());
// Title text
svg.append("text")
.attr("font-family", "sans-serif")
.attr("font-size", 20)
.attr("y", 20)
.text(" Education Indicator : % of 25-64 years-old population has tertiary eduction ")
// Title text
// legend
const scale = d3.scaleOrdinal()
.domain(["North America", "Europe", "Asia", "Oceania"])
.range(["#ED9A9B", "#F7BB80","#ADD4D1", "#95AFCA"]);
const legend = d3Legend
.legendColor()
.shape("path", d3.symbol().type(d3.symbolCircle).size(25)()) //.shape("circle")
.shapePadding(15)
.labelOffset(5)
.scale(scale)
.labels(["North America", "Europe", "Asia", "Oceania"]);
svg.append("g")
.attr("class", "legend_auto")
.style('font-size', 12)
.style('font-family', 'sans-serif')
.attr("transform", `translate(${width - margin.right + 20}, ${margin.top - 20})`)
.call(legend)
//
return Object.assign(svg.node(), {
update(keyframe) {
const transition = svg.transition()
.duration(duration)
.ease(d3.easeLinear);
// Extract the top bar’s value.
x.domain([0, keyframe[1][0].value]);
updateAxis(keyframe, transition);
updateBars(keyframe, transition);
updateLabels(keyframe, transition);
updateTicker(keyframe, transition);
}
});
}
update = chart.update(keyframe)
data2 = d3.csvParse(await FileAttachment("DP_LIVE_06042021203914841_Full12.csv").text(), d3.autoType)
//data = FileAttachment("category-brands.csv").csv({typed: true})
data = data2.filter(function(d) {
if( d.SUBJECT == "TRY" && d.TIME > 1990)
{
return d;
}
});
duration = 250
n = 12
names = new Set(data.map(d => d.name))
datevalues = Array.from(d3.rollup(data, ([d]) => d.value, d => +d.date, d => d.name))
.map(([date, data]) => [new Date(date), data])
.sort(([a], [b]) => d3.ascending(a, b))
function rank(value) {
const data = Array.from(names, name => ({name, value: value(name)}));
data.sort((a, b) => d3.descending(a.value, b.value));
for (let i = 0; i < data.length; ++i) data[i].rank = Math.min(n, i);
return data;
}
k = 14
keyframes = {
const keyframes = [];
let ka, a, kb, b;
for ([[ka, a], [kb, b]] of d3.pairs(datevalues)) {
for (let i = 0; i < k; ++i) {
const t = i / k;
keyframes.push([
new Date(ka * (1 - t) + kb * t),
rank(name => (a.get(name) || 0) * (1 - t) + (b.get(name) || 0) * t)
]);
}
}
keyframes.push([new Date(kb), rank(name => b.get(name) || 0)]);
return keyframes;
}
function bars(svg) {
let bar = svg.append("g")
.attr("fill-opacity", 0.6)
.selectAll("rect");
return ([date, data], transition) => bar = bar
.data(data.slice(0, n), d => d.name)
.join(
enter => enter.append("rect")
.attr("fill", color)
.attr("height", y.bandwidth())
.attr("x", x(0))
.attr("y", y(n))
.attr("width", d => x(d.value) - x(0)),
update => update,
exit => exit.transition(transition).remove()
.attr("y", y(n))
.attr("width", d => x(d.value) - x(0))
)
.call(bar => bar.transition(transition)
.attr("y", d => y(d.rank))
.attr("width", d => x(d.value) - x(0)));
}
function labels(svg) {
let label = svg.append("g")
.style("font", "bold 12px var(--sans-serif)")
.style("font-variant-numeric", "tabular-nums")
.attr("text-anchor", "end")
.selectAll("text");
return ([date, data], transition) => label = label
.data(data.slice(0, n), d => d.name)
.join(
enter => enter.append("text")
.attr("transform", d => `translate(${x(d.value)},${y(n)})`)
.attr("y", y.bandwidth() / 2)
.attr("x", -6)
.attr("dy", "-0.25em")
.text(d => d.name)
.call(text => text.append("tspan")
.attr("fill-opacity", 0.7)
.attr("font-weight", "normal")
.attr("x", -6)
.attr("dy", "1.15em")),
update => update,
exit => exit.transition(transition).remove()
.attr("transform", d => `translate(${x(d.value)},${y(n)})`)
)
.call(bar => bar.transition(transition)
.attr("transform", d => `translate(${x(d.value)},${y(d.rank)})`)
.call(g => g.select("tspan").tween("text", function(d) {
return textTween(parseNumber(this.textContent), d.value);
})));
}
function textTween(a, b) {
const i = d3.interpolateNumber(a, b);
return function(t) {
this.textContent = formatNumber(i(t));
};
}
parseNumber = string => +string.replace(/,/g, "")
formatNumber = d3.format(",d")
function axis(svg) {
const g = svg.append("g")
.attr("transform", `translate(0,${margin.top})`);
const axis = d3.axisTop(x)
.ticks(width / 160)
.tickSizeOuter(0)
.tickSizeInner(-barSize * (n + y.padding()));
return (_, transition) => {
g.transition(transition).call(axis);
g.select(".tick:first-of-type text").remove();
g.selectAll(".tick:not(:first-of-type) line").attr("stroke", "white");
g.select(".domain").remove();
};
}
function ticker(svg) {
const now = svg.append("text")
.style("font", `bold ${barSize}px var(--sans-serif)`)
.style("font-variant-numeric", "tabular-nums")
.attr("text-anchor", "end")
.attr("x", width - 6)
.attr("y", margin.top + barSize * (n - 0.45))
.attr("dy", "0.32em")
.text(formatDate(keyframes[0][0]));
return ([date], transition) => {
transition.end().then(() => now.text(formatDate(date)));
};
}
formatDate = d3.utcFormat("%Y")
color = {
const scale = d3.scaleOrdinal(d3.schemeTableau10);
if (data.some(d => d.category !== undefined)) {
const categoryByName = new Map(data.map(d => [d.name, d.category]))
scale.domain(categoryByName.values());
return d => scale(categoryByName.get(d.name));
}
return d => scale(d.name);
}
x = d3.scaleLinear([0, 1], [margin.left, width - margin.right])
y = d3.scaleBand()
.domain(d3.range(n + 1))
.rangeRound([margin.top, margin.top + barSize * (n + 1 + 0.1)])
.padding(0.1)
height = margin.top + barSize * n + margin.bottom
barSize = 48
margin = ({top: 50, right: 120, bottom: 6, left: 0})
d3 = require("d3@6")
import {Scrubber} from "@mbostock/scrubber"
d3Legend = require('d3-svg-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.
