canvas = {
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,
color: color()
};
}
function color() {
var s = "0123456789ABCDEF";
var c = "#";
for (var i = 0; i < 6; i++) {
c += s[Math.ceil(Math.random() * 15)]
}
return c
}
let fade = 0;
context.fillRect(0, 0, width, height);
while (true) {
context.save();
if (fade++ > 3) {
context.globalAlpha = .05;
context.fillStyle = 'black';
context.fillRect(0, 0, width, height);
fade = 0;
} else {
context.globalAlpha = 1;
}
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.fillStyle = p.color;
context.arc(p.x, p.y, radius, 0, 2 * Math.PI);
context.fill();
}
context.restore();
yield context.canvas;
}
}
n = 100
height = 600
radius = 5
minDistance = 40
maxDistance = 60
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