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int xLocation;

void setup() {
  size(400,400);
  background(255);
  rectMode(CENTER);
  xLocation = int(random(0,width));
  println(xLocation);
}

void draw() {
  fill(200,0,0);
  rect(width/2, height/2, 10,10);
  
  fill(0,0,200);
  rect(width/2 + xLocation/2, height/2, 10,10);
  rect(width/2 - xLocation/2, height/2, 10,10);
  
  
}