canvas = {
const minDistance2 = minDistance * minDistance;
const maxDistance2 = maxDistance * maxDistance;
const context = DOM.context2d(width, height);
const particles = new Array(n);
for (let i = 0; i < n; ++i) {
particles[i] = {
x: Math.random() * width,
y: Math.random() * height,
vx: 0,
vy: 0
};
}
while (true) {
context.save();
context.clearRect(0, 0, width, height);
for (let i = 0; i < n; ++i) {
const p = particles[i];
p.x += p.vx;
if (p.x < -maxDistance) p.x += width + maxDistance * 2;
else if (p.x > width + maxDistance) p.x -= width + maxDistance * 2;
p.y += p.vy;
if (p.y < -maxDistance) p.y += height + maxDistance * 2;
else if (p.y > height + maxDistance) p.y -= height + maxDistance * 2;
p.vx += 0.2 * (Math.random() - .5) - 0.01 * p.vx;
p.vy += 0.2 * (Math.random() - .5) - 0.01 * p.vy;
context.beginPath();
context.arc(p.x, p.y, radius, 0, 2 * Math.PI);
context.fill();
}
for (let i = 0; i < n; ++i) {
for (let j = i + 1; j < n; ++j) {
const pi = particles[i];
const pj = particles[j];
const dx = pi.x - pj.x;
const dy = pi.y - pj.y;
const d2 = dx * dx + dy * dy;
if (d2 < maxDistance2) {
context.globalAlpha = d2 > minDistance2 ? (maxDistance2 - d2) / (maxDistance2 - minDistance2) : 1;
context.beginPath();
context.moveTo(pi.x, pi.y);
context.lineTo(pj.x, pj.y);
context.stroke();
}
}
}
context.restore();
yield context.canvas;
}
}
n = 200
height = 600
radius = 2.5
minDistance = 40
maxDistance = 60
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