Published
Edited
Jan 24, 2021
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md`testing`
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chart = {
const svg = d3.select(DOM.svg(width, height))
.style("-webkit-tap-highlight-color", "transparent")
.style("overflow", "visible");

svg.append("g")
.call(xAxis);

svg.append("g")
.call(yAxis);
svg.append("path")
.datum(data)
.attr("fill", "none")
.attr("stroke", "steelblue")
.attr("stroke-width", 1.5)
.attr("stroke-linejoin", "round")
.attr("stroke-linecap", "round")
.attr("d", line);

const tooltip = svg.append("g");

svg.on("touchmove mousemove", function(event) {
const {date, value} = bisect(d3.pointer(event, this)[0]);

tooltip
.attr("transform", `translate(${x(date)},${y(value)})`)
.call(callout, `${formatValue(value)}
${formatDate(date)}`);
});

svg.on("touchend mouseleave", () => tooltip.call(callout, null));

return svg.node();
}
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callout = (g, value) => {
if (!value) return g.style("display", "none");

g
.style("display", null)
.style("pointer-events", "none")
.style("font", "10px sans-serif");

const path = g.selectAll("path")
.data([null])
.join("path")
.attr("fill", "white")
.attr("stroke", "black");

const text = g.selectAll("text")
.data([null])
.join("text")
.call(text => text
.selectAll("tspan")
.data((value + "").split(/\n/))
.join("tspan")
.attr("x", 0)
.attr("y", (d, i) => `${i * 1.1}em`)
.style("font-weight", (_, i) => i ? null : "bold")
.text(d => d));

const {x, y, width: w, height: h} = text.node().getBBox();

text.attr("transform", `translate(${-w / 2},${15 - y})`);
path.attr("d", `M${-w / 2 - 10},5H-5l5,-5l5,5H${w / 2 + 10}v${h + 20}h-${w + 20}z`);
}
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data = Object.assign(d3.csvParse(await FileAttachment("aapl.csv").text(), d3.autoType).map(({date, close}) => ({date, value: close})), {y: "$ Close"})
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x = d3.scaleUtc()
.domain(d3.extent(data, d => d.date))
.range([margin.left, width - margin.right])
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y = d3.scaleLinear()
.domain([0, d3.max(data, d => d.value)]).nice()
.range([height - margin.bottom, margin.top])
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xAxis = g => g
.attr("transform", `translate(0,${height - margin.bottom})`)
.call(d3.axisBottom(x).ticks(width / 80).tickSizeOuter(0))
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yAxis = g => g
.attr("transform", `translate(${margin.left},0)`)
.call(d3.axisLeft(y))
.call(g => g.select(".domain").remove())
.call(g => g.select(".tick:last-of-type text").clone()
.attr("x", 3)
.attr("text-anchor", "start")
.attr("font-weight", "bold")
.text(data.y))
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line = d3.line()
.curve(d3.curveStep)
.defined(d => !isNaN(d.value))
.x(d => x(d.date))
.y(d => y(d.value))
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function formatValue(value) {
return value.toLocaleString("en", {
style: "currency",
currency: "USD"
});
}
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function formatDate(date) {
return date.toLocaleString("en", {
month: "short",
day: "numeric",
year: "numeric",
timeZone: "UTC"
});
}
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bisect = {
const bisect = d3.bisector(d => d.date).left;
return mx => {
const date = x.invert(mx);
const index = bisect(data, date, 1);
const a = data[index - 1];
const b = data[index];
return b && (date - a.date > b.date - date) ? b : a;
};
}
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height = 500
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margin = ({top: 20, right: 30, bottom: 30, left: 40})
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d3 = require("d3@6")
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