Published
Edited
Nov 10, 2021
4 forks
38 stars
chart = {
const candleStick = Plot.plot({
width: width,
height: 350,
marginBottom: 10,
x: {label: null, round: false},
y: {axis: "right", grid: true, nice: true},
color: {type: "identity"},
marks: [
Plot.ruleX(data, {x: "Date", y1: "High", y2: "Low", stroke: getColor}),
Plot.barY(data, {x: "Date", y1: "Open", y2: "Close", fill: getColor})
]
});
candleStick.querySelector("g[text-anchor='middle']").remove();
const column = Plot.plot({
width: width,
height: 200,
x: {label: null, round: false, tickSize: 1, tickFormat: ticks},
y: {grid: true, axis: "right", tickFormat: "s"},
color: {type: "identity"},
marks: [Plot.barY(data, {x: "Date", y1: "Volume", fill: getColor})]
});
const overlay = Plot.plot({
width: width,
height: 570,
x: {label: null, round: false},
y: {axis: "right", type: "identity"},
color: {type: "identity"},
marks: [Plot.barY(data, {x: "Date", y1: 20, y2: 520})]
});
enableOverlay(overlay);
return html`<div>${[candleStick, column, overlay]}</div>`;
}
enableOverlay = overlay => {
[...overlay.querySelectorAll("g[text-anchor]")].forEach(g => g.remove());
const defaultTitle = "TSLA Historical Data";
const text = d3.select(overlay)
.append("text")
.attr("dy", "1em")
.attr("text-anchor", "start")
.attr("font-weight", "bold")
.text(defaultTitle);
const rect = d3.select(overlay)
.style("position", "absolute")
.style("top", 0)
.style("background-color", "transparent")
.selectAll("rect");
rect
.attr("fill", "#aaa")
.attr("fill-opacity", 0)
.on("pointerover", e => {
const i = rect.nodes().indexOf(e.currentTarget);
const d = data[i];
e.currentTarget.setAttribute("fill-opacity", 0.5);
text
.attr("fill", _ => getColor(d))
.text(getTitle(d));
})
.on("pointerout", e => {
e.currentTarget.setAttribute("fill-opacity", 0);
text
.attr("fill", "currentColor")
.text(defaultTitle);
});
}
ticks = d => {
if ((range === "5D" || range === "1M")) {
return d3.timeFormat("%m-%d")(d);
}
else if (firstDays.indexOf(d) >= 0) {
if (d.getMonth() === 0 || d === data[0].Date) {
return d.getFullYear();
}
else if (range === "5Y" || range === "Max") {
return d.getMonth() === 0 || d === data[0].Date ? d.getFullYear() : "";
}
else {
return d3.timeFormat("%B")(d).substring(0, 3);
}
}
return "";
}
firstDays = {
const dates = [];
let p = -1;
data.reverse().forEach(d => {
if (d.Date.getMonth() !== p) dates.push(d.Date);
p = d.Date.getMonth();
});
return dates;
}
getColor = d => d.Close >= d.Open ? "#649334" : "#cc392b"
getTitle = d => [
`${d3.timeFormat("%m/%d/%Y")(d.Date)}`,
`Open: ${d.Open}`,
`Close: ${d.Close}`,
`High: ${d.High}`,
`Low: ${d.Low}`,
`Volume: ${d3.format(",")(d.Volume)}`
].join(" ");
data = {
const src = await FileAttachment("Nasdaq_TSLA.csv").csv({typed: true});
src.forEach(d => d.Date = d3.timeParse("%m/%d/%Y")(d.Date));
let e = src[0].Date, s = new Date(e);
if (range === "5D") s.setDate(s.getDate() - 5);
else if (range === "1M") s.setMonth(s.getMonth() - 1);
else if (range === "3M") s.setMonth(s.getMonth() - 3);
else if (range === "6M") s.setMonth(s.getMonth() - 6);
else if (range === "YTD") s = new Date(`1/1/${s.getFullYear()}`);
else if (range === "1Y") s.setYear(s.getFullYear() - 1);
else if (range === "2Y") s.setYear(s.getFullYear() - 2);
else if (range === "5Y") s.setYear(s.getFullYear() - 5);
return range === "Max" ? src : src.filter(d => d.Date >= s && d.Date <= e);
}
One platform to build and deploy the best data apps
Experiment and prototype by building visualizations in live JavaScript notebooks. Collaborate with your team and decide which concepts to build out.
Use Observable Framework to build data apps locally. Use data loaders to build in any language or library, including Python, SQL, and R.
Seamlessly deploy to Observable. Test before you ship, use automatic deploy-on-commit, and ensure your projects are always up-to-date.