data viz + front end development
Published
Edited
Oct 15, 2018
1 star
chart = {
const svg = d3.select(DOM.svg(width, height));
const defs = svg.append("defs");
const linearGradient = defs.append("linearGradient")
.attr("id", "linear");
/* vertical gradient */
linearGradient
.attr("x1", "0%")
.attr("y1", "0%")
.attr("x2", "0%")
.attr("y2", "100%");
// Set the color for the start
linearGradient.append("stop")
.attr("offset", "0%")
.attr("stop-color", color1value);
// Set the color for the end
linearGradient.append("stop")
.attr("offset", "100%")
.attr("stop-color", color2value);
svg.append("g")
.call(xAxis);
svg.append("g")
.call(yAxis);
svg.append("path")
.datum(data)
.attr("fill", "none")
.attr("stroke", "url(#linear)")
.attr("stroke-width", 2)
.attr("stroke-linejoin", "round")
.attr("stroke-linecap", "round")
.attr("d", line);
return svg.node();
}
height = 300
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).ticks(8, "$.0f"))
.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()
.defined(d => !isNaN(d.value))
.x(d => x(d.date))
.y(d => y(d.value))
data = (await require("@observablehq/aapl")).map(({date, close}) => ({date, value: 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.
