Published
Edited
Nov 24, 2018
2 forks
5 stars
chart = {
replay;
const svg = d3.select(DOM.svg(width, height));
const duration = 500;
const delay = 2;
const newData = data.map((d,i)=>{
const xvalue = x(d.date);
const yvalue = y(d.value);
const sy = height - margin.bottom;
const sx = xvalue;
return {
x:xvalue,
y:yvalue,
sx:sx,
sy:sy,
cx:sx,
cy:sy
}
});
svg.append("g")
.call(xAxis);
svg.append("g")
.call(yAxis);
const path = svg.append("path")
.attr("fill", "none")
.attr("stroke", "steelblue")
.attr("stroke-width", 1.5)
.attr("stroke-linejoin", "round")
.attr("stroke-linecap", "round")
const timer = d3.timer(absT => {
if (absT > duration + delay * newData.length) {
timer.stop();
}
newData.forEach((d, i, a) => {
const elapsed = Math.min(duration, absT - delay * i);
if (elapsed < 0) return;
const t = d3.easeBackOut(elapsed / duration);
a[i].cx = d.sx + (d.x - d.sx) * t;
a[i].cy = d.sy + (d.y - d.sy) * t;
});
path.attr('d', line(newData));
});
return svg.node();
}
height = 500
margin = ({top: 20, right: 30, bottom: 30, left: 40})
x = d3.scaleTime()
.domain(d3.extent(data, d => d.date))
.range([margin.left, width - margin.right])
y = d3.scaleLinear()
.domain([0, d3.max(data, d => d.value)]).nice()
.range([height - margin.bottom, margin.top])
xAxis = g => g
.attr("transform", `translate(0,${height - margin.bottom})`)
.call(d3.axisBottom(x).ticks(width / 80).tickSizeOuter(0))
yAxis = g => g
.attr("transform", `translate(${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))
line = d3.line()
.x(d => d.cx)
.y(d => d.cy)
data = Object.assign(
(await require("@observablehq/aapl")).map(({date, close}) => ({date, value: close})),
{y: "$ Close"}
)
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.
