Public
Edited
Oct 24, 2023
4 stars
Insert cell
Insert cell
Insert cell
d3.interpolateNumberArray([0, 1], [1, 3])(t)
Insert cell
Insert cell
d3.interpolateNumberArray([0, 1], Float64Array.of(1, 3))(t)
Insert cell
Insert cell
d3.interpolateNumberArray([0, 1], Float32Array.of(1, 3))(t)
Insert cell
Insert cell
d3.interpolateNumberArray([0, 0], Uint8ClampedArray.of(127, 255))(t)
Insert cell
d3.interpolateNumberArray([0, 0], Int32Array.of(1e7, 5e7))(t)
Insert cell
Insert cell
Insert cell
d3.interpolateNumberArray([0, 0], [1000, 1000, 1000, 1000])(t) // interpolates the two first values of b
Insert cell
d3.interpolateNumberArray(null, [1000, 1000, 1000, 1000])(t) // returns all values of b
Insert cell
Insert cell
Insert cell
a = Array.from({length: 100000}).fill(0)
Insert cell
b = Array.from({length: 100000}, Math.random)
Insert cell
generic = d3.interpolate(a, b) // slow 🐢
Insert cell
implicit = d3.interpolate(a, Float64Array.from(b)) // b is typed, fast 👍
Insert cell
explicit = d3.interpolateNumberArray(a, b) // fast 👍
Insert cell
Insert cell
Insert cell
{
replay;
const contexta = DOM.context2d(200, 200, 1);
const contextb = DOM.context2d(200, 200, 1);
const context = DOM.context2d(200, 200, 1);

contexta.fillStyle = "red";
contexta.fillRect(0, 0, 150, 150);
contextb.fillStyle = "green";
contextb.fillRect(50, 50, 150, 150);

const a = contexta.getImageData(0, 0, 200, 200);
const b = contextb.getImageData(0, 0, 200, 200);
const c = context.createImageData(200, 200);
const interpolator = d3.interpolateNumberArray(a.data, b.data);

for (let i = 0, n = 120; i < n; ++i) {
c.data.set(interpolator(i / (n - 1)));
context.putImageData(c, 0, 0);
yield context.canvas;
await visibility();
}
}
Insert cell
Insert cell
{
const a = Array.of(0, 0);
const b = Array.of(100, 100);
const i = d3.interpolateNumberArray(a, b);
b[1] = 0; // mutation! 🌶
return i(0.5);
}
Insert cell
Insert cell
{
const a = Array.of(0, 0);
const b = Array.of(100, 100);
const i = d3.interpolateNumberArray(a.slice(), b.slice()); // defensive copy 😇
b[1] = 0; // mutation! 🌶
return i(0.5);
}
Insert cell

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.
Learn more