chart = {
const svg = d3.create("svg").attr("viewBox", [0, 0, width, height]);
svg
.append("g")
.attr("fill", "#ff838e")
.selectAll("rect")
.data(bins)
.join("rect")
.attr("x", d => x(d.x0) + 1)
.attr("width", d => Math.max(0, x(d.x1) - x(d.x0) - 1))
.attr("y", d => y(d.length))
.attr("height", d => y(0) - y(d.length));
svg
.append("g")
.attr('font-size', '10px')
.attr('text-anchor', 'middle')
.selectAll('text')
.data(
bins.filter(
d => d.length > 1 && (d.x0 * 10000000).toString().match(/100+/)
)
)
.join('text')
.attr("x", d => x(d.x0))
.attr("y", d => y(d.length))
.attr('dx', d => (x(d.x1) - x(d.x0)) / 2)
.attr('dy', -2)
.text(d => `${d.x0 / 100000000}~${d.x1 / 100000000}`);
svg.append("g").call(xAxis);
svg.append("g").call(yAxis);
return svg.node();
}
data = {
filter;
var condition;
switch (filter) {
case "currently active":
condition = "close->block=eq.null";
break;
case "closed":
condition = "close->block=neq.null";
break;
case "all":
condition = "";
break;
}
return Object.assign(
(
await (
await fetch(
`https://ln.fiatjaf.com/api/channels?select=satoshis&${condition}`
)
).json()
).map((ch) => ch.satoshis),
{ x: "BTC per channel", y: "# channels" }
);
}
bins = d3
.histogram()
.domain(x.domain())
.thresholds(x.ticks(15))(data)
x = d3
.scaleLog()
.domain([d3.min(data), d3.max(data) + 1000000000])
.range([margin.left, width - margin.right])
y = d3.scaleLinear()
.domain([0, d3.max(bins, d => d.length)]).nice()
.range([height - margin.bottom, margin.top])
xAxis = g =>
g
.attr("transform", `translate(0,${height - margin.bottom})`)
.call(
d3
.axisBottom(x)
.tickSizeOuter(0)
.tickFormat((v, i) => (i % 4 === 0 ? parseInt(v)/100000000 : ''))
)
.call(g =>
g
.append("text")
.attr("x", width - margin.right)
.attr("y", -4)
.attr("fill", "currentColor")
.attr("font-weight", "bold")
.attr("text-anchor", "end")
.text(data.x)
)
yAxis = g => g
.attr("transform", `translate(${margin.left},0)`)
.call(d3.axisLeft(y).ticks(height / 40))
.call(g => g.select(".domain").remove())
.call(g => g.select(".tick:last-of-type text").clone()
.attr("x", 4)
.attr("text-anchor", "start")
.attr("font-weight", "bold")
.text(data.y))
height = 500
margin = ({top: 20, right: 20, bottom: 30, left: 40})
d3 = require("d3@5")
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.
