Visualization toolmaker. Founder @observablehq. Creator @d3. Former @nytgraphics. Pronounced BOSS-tock.
{
const context = DOM.context2d(width, height);
const perlin = new Noise(3);
const particles = new Set();
for (let i = 0; i < count; ++i) {
particles.add({
x: width / 2,
y: height / 2,
a: i / count * 2 * Math.PI
});
}
context.globalAlpha = 0.5;
context.lineWidth = 0.5;
while (particles.size) {
for (const p of particles) {
const n = perlin.noise(p.x * 0.01, p.y * 0.01);
const a = p.a + n * 16;
p.x += Math.cos(a);
p.y += Math.sin(a);
context.fillRect(p.x, p.y, 1, 1);
if (p.x < 0 || p.x >= width || p.y < 0 || p.y >= height) {
particles.delete(p);
}
}
yield context.canvas;
}
}
height = 600
count = 720
class Noise {
static lerp(t, a, b) {
return a + t * (b - a);
}
static grad2d(i, x, y) {
const v = (i & 1) === 0 ? x : y;
return (i & 2) === 0 ? -v : v;
}
constructor(octaves = 1) {
this.p = new Uint8Array(512);
this.octaves = octaves;
this.init();
}
init() {
for (let i = 0; i < 512; ++i) {
this.p[i] = Math.random() * 256;
}
}
noise2d(x2d, y2d) {
const X = Math.floor(x2d) & 255;
const Y = Math.floor(y2d) & 255;
const x = x2d - Math.floor(x2d);
const y = y2d - Math.floor(y2d);
const fx = (3 - 2 * x) * x * x;
const fy = (3 - 2 * y) * y * y;
const p0 = this.p[X] + Y;
const p1 = this.p[X + 1] + Y;
return Noise.lerp(
fy,
Noise.lerp(
fx,
Noise.grad2d(this.p[p0], x, y),
Noise.grad2d(this.p[p1], x - 1, y)
),
Noise.lerp(
fx,
Noise.grad2d(this.p[p0 + 1], x, y - 1),
Noise.grad2d(this.p[p1 + 1], x - 1, y - 1)
)
);
}
noise(x, y) {
let e = 1,
k = 1,
s = 0;
for (let i = 0; i < this.octaves; ++i) {
e *= 0.5;
s += e * (1 + this.noise2d(k * x, k * y)) / 2;
k *= 2;
}
return s;
}
}
LICENSE = "mit" /*
Copyright (c) 2018 by Gerard Ferrandez (https://codepen.io/ge1doot/pen/wPymJv)
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
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.
