Public
Edited
Jun 21, 2023
4 forks
31 stars
chart = {
const svg = d3.create("svg")
.attr("width", width)
.attr("height", height)
.attr("viewBox", [0, 0, width, height])
.attr("style", "max-width: 100%; height: auto; font: 10px sans-serif;");
const g = svg.append("g")
.selectAll("g")
.data(data)
.enter().append("g")
.attr("transform", (d, i) => `translate(0,${i * (step + 1) + margin.top})`);
g.append("clipPath")
.attr("id", d => (d.clip = DOM.uid("clip")).id)
.append("rect")
.attr("width", width)
.attr("height", step);
g.append("defs").append("path")
.attr("id", d => (d.path = DOM.uid("path")).id)
.attr("d", d => area(d.values));
g.append("g")
.attr("clip-path", d => d.clip)
.selectAll("use")
.data(d => Array.from(
{length: overlap * 2},
(_, i) => Object.assign({index: i < overlap ? -i - 1 : i - overlap}, d)
))
.enter().append("use")
.attr("fill", d => color(d.index))
.attr("transform", d => mirror && d.index < 0
? `scale(1,-1) translate(0,${d.index * step})`
: `translate(0,${(d.index + 1) * step})`)
.attr("xlink:href", d => d.path.href);
g.append("text")
.attr("x", 4)
.attr("y", step / 2)
.attr("dy", "0.35em")
.text(d => d.key);
svg.append("g")
.call(xAxis);
return svg.node();
}
height = data.length * (step + 1) + margin.top + margin.bottom
margin = ({top: 30, right: 10, bottom: 0, left: 10})
step = 59
color = i => d3[scheme][overlap * 2 + 1][i + (i >= 0) + overlap]
x = d3.scaleUtc()
.domain([data[0].values[0].date, data[0].values[data[0].values.length - 1].date])
.range([0, width])
y = {
const max = d3.max(data, d => d3.max(d.values, d => Math.abs(d.value)));
return d3.scaleLinear()
.domain([-max, +max])
.range([overlap * step, -overlap * step]);
}
xAxis = g => g
.attr("transform", `translate(0,${margin.top})`)
.call(d3.axisTop(x).ticks(width / 80).tickSizeOuter(0))
.call(g => g.selectAll(".tick").filter(d => x(d) < margin.left || x(d) >= width - margin.right).remove())
.call(g => g.select(".domain").remove())
area = d3.area()
.curve(d3.curveStep)
.defined(d => !isNaN(d.value))
.x(d => x(d.date))
.y0(0)
.y1(d => y(d.value))
data = Promise.all([FileAttachment("AAPL.csv"), FileAttachment("AMZN.csv"), FileAttachment("GOOG.csv"), FileAttachment("IBM.csv"), FileAttachment("MSFT.csv")].map(async file => {
const values = d3.csvParse(await file.text(), d => {
const date = parseDate(d["Date"]);
return {date, value: +d["Close"]};
});
const v = values[0].value;
return {
key: file.name.slice(0, -4),
values: values.map(({date, value}) => ({date, value: Math.log(value / v)}))
};
}))
parseDate = d3.utcParse("%Y-%m-%d")
d3 = require("d3@6")
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.
