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bitcoin.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Bitcoin Chart</title>
<script
src="https://cdnjs.cloudflare.com/ajax/libs/d3/7.9.0/d3.min.js"
integrity="sha512-vc58qvvBdrDR4etbxMdlTt4GBQk1qjvyORR2nrsPsFPyrs+/u5c3+1Ct6upOgdZoIl7eq6k3a1UPDSNAQi/32A=="
crossorigin="anonymous"
referrerpolicy="no-referrer"
></script>
</head>
<body style="text-align: center">
<svg width="600" height="400"></svg>
<script>
async function fetchData() {
const response = await fetch(
"https://api.coingecko.com/api/v3/coins/bitcoin/market_chart?vs_currency=usd&days=30"
);
const data = await response.json();
return data.prices.map(([timestamp, price]) => ({
date: new Date(timestamp),
price,
}));
}
async function drawChart() {
const data = await fetchData();
const margin = { top: 20, right: 30, bottom: 30, left: 50 };
const width = 900 - margin.left - margin.right;
const height = 400 - margin.top - margin.bottom;
const svg = d3
.select("svg")
.attr("width", width + margin.left + margin.right)
.attr("height", height + margin.top + margin.bottom)
.append("g")
.attr("transform", `translate(${margin.left}, ${margin.top})`);
const x = d3
.scaleUtc()
.domain(d3.extent(data, (d) => d.date))
.range([0, width]);
const y = d3
.scaleLinear()
.domain([0, d3.max(data, (d) => d.price)])
.nice()
.range([height, 0]);
svg
.append("g")
.attr("transform", `translate(0, ${height})`)
.call(d3.axisBottom(x));
svg.append("g").call(d3.axisLeft(y));
svg
.append("path")
.datum(data)
.attr("fill", "none")
.attr("stroke", "steelblue")
.attr("stroke-width", 1.5)
.attr(
"d",
d3
.line()
.x((d) => x(d.date))
.y((d) => y(d.price))
);
}
drawChart();
</script>
</body>
</html>