May I answer my own question:

include("raster.js");

if (initRaster()) {
values = prompt("Enter Raster Values:",
{type: "number", value: 2, title: "Grid Size:", width: 50},
{type: "number", value: 100, title: "Object Scale (%):", width: 50}
);
if (values) {
var size = values[0], scale = values[1] / 100.0;
var offset = values[0]/2;

function drawDot(x, y, dot, radius) {
if (radius > 0) {
var art = dot.clone();
var m = new Matrix();
var odd = y%2;
m.scale(radius * scale);
if (odd) {
m.translate(x * size + offset, y * size);
}
else {
m.translate(x * size, y * size);
}
art.transform(m);
return art;
}
return null;
}

doRaster();
}
}