final int NUMSQ = 10;

Square[][] squares = new Square[10][10];

void setup() {
  size(500, 500);
  for (int x = 0; x < NUMSQ; x++) {
    for (int y = 0; y < NUMSQ; y++) {
      squares[x][y] = new Square(x,y);
    }
  }
  rectMode(CENTER);
   noStroke();
}

void draw() {
  background(255,128,0);
  for (int x = 0; x < NUMSQ; x++) {
    for (int y = 0; y < NUMSQ; y++) {
      Square s = squares[x][y];
      s.draw();
    }
  }
  
}



class Square {
  float x, y; 
  Square(int xp, int yp) {
    x = (xp + .5) *  ( 500 / NUMSQ);
    y = (yp + .5)* ( 500 / NUMSQ);
  }
  void draw() {
    fill(128,64,0);
    float d = dist(x,y,mouseX,mouseY)/9;
    rect(x, y, d,d);
  }
}