function setup() {
  createCanvas(windowWidth, windowHeight);
  rectMode(CENTER);
  noFill();
}
changing positions of stapled circles in a grid

MOUSE
position x          : module detail
position y          : module parameter

KEYS
1-3                 : draw mode
arrow left/right    : number of tiles horizontally
arrow up/down       : number of tiles vertically
s                   : save png