{
replay;
const width = 600,
height = 200,
movers = cm.range(20).map((d) =>
object({
location: cm.vec(cm.random(width), cm.random(height)),
velocity: cm.vec(cm.random(-1, 1), cm.random(-1, 1)),
acceleration: cm.vec(),
mass: cm.random(2, 5),
G: 0.4
})
);
function update(app) {
app.append(cm.clear, { fill: cm.rgb(255) });
app
.data(movers)
.process(cm.each, (i) =>
app
.data(movers)
.process(cm.filter, (j) => i !== j)
.process(cm.each, (j) => attraction(j)(i))
)
.process(cm.each, move)
.append(cm.circle, {
x: (d) => d.location.x,
y: (d) => d.location.y,
r: (d) => d.mass * 2,
fill: cm.rgb(175),
stroke: "#000",
strokeWidth: 2
});
}
function dispose(app) {
invalidation.then(() => app.dispose());
}
function frame(app) {
app.node().style.border = "solid #000 1px";
}
return cm
.app({ width, height })
.on("update", update)
.call(dispose)
.call(frame)
.start()
.node();
}
function object(options) {
return {
location: cm.vec(),
velocity: cm.vec(),
acceleration: cm.vec(),
mass: 1,
aVelocity: 0,
aAcceleration: 0,
rotation: 0,
...options
};
}
function force(d) {
const callback = typeof d === "function" ? d : () => d;
return (d, ...params) => {
const f = callback(d, ...params);
if (f === null || f === undefined) return;
const a = cm.vecDiv(f, d.mass);
d.acceleration.add(a);
};
}
function move(d) {
d.velocity.add(d.acceleration);
d.location.add(d.velocity);
d.acceleration.mult(0);
}
function attraction(attractor) {
const { mass, G } = attractor;
return (d) => {
const dir = cm.vecSub(attractor.location, d.location);
const dist = cm.vecClamp(dir, 5, 25).mag();
const strength = (G * mass * d.mass) / (dist * dist);
const f = cm.vecMag(dir, strength);
const apply = force(f);
apply(d);
};
}
cm = require("@charming-art/charming@0.0.6")
import { quote } from "@pearmini/charming-shared"
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.
