{
const height = 400;
const ctx = DOM.context2d(width, height);
let rows = 8;
let cols = 14;
let radius = 4;
let pH = Math.PI / 180;
let spanX = (width/cols);
let spanY = (height/rows);
let points = [];
for (let j=0; j<rows; ++j) {
let cy = spanY * j + spanY/2;
let c = (j%2) ? cols : cols-1;
let hx = (j%2) ? spanX/2 : spanX;
for (let i=0; i<c; ++i) {
let cx = spanX * i + hx;
points.push({ cx, cy });
}
}
setInterval(() => {
ctx.clearRect(0, 0, width, height);
ctx.fillStyle="#4a4a4a";
points.forEach(p => {
let theta = Math.random() * 360;
let magnitude = d3.randomExponential(1)() * 2;
let x = p.cx + (Math.sin(theta * pH) * magnitude);
let y = height - (p.cy + (Math.cos(theta * pH) * magnitude));
ctx.beginPath();
ctx.arc(x, y, radius, 0, Math.PI * 2, true);
ctx.closePath();
ctx.fill();
});
}, 250);
yield ctx.canvas;
}
d3 = require("d3-random@1")
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