in www/src/utils/particles.ts [373:384]
function mouseDown(e) {
for (let i = gravities.length - 1; i >= 0; i--) {
if (gravities[i].isMouseOver) {
gravities[i].startDrag(mouse);
return;
}
}
gravities.push(new GravityPoint(e.clientX, e.clientY, G_POINT_RADIUS, {
particles: particles,
gravities: gravities,
}));
}