Board myBoard;
//Cell myCell;

void setup() {
  size(400, 400);
  //myCell = new Cell(0, 0, width, height);
  myBoard = new Board();
}

void draw() {
  background(0);
  //myCell.click();
  //myCell.display();
  myBoard.check();
  myBoard.display();
}

class Board {
  Cell[][] board;
  turn = 1;

  Board() {
    for (int i = 0; i < 3; i++) {
      for (int j = 0; j < 3; j++) {
        board[i][j] = new Cell(); // you do this
      }
    }
  }

  void check() {
  } //check for a winner

  void display() {
    for (int i = 0; i < 3; i++) {
      for (int j = 0; j < 3; j++) {
        board[i][j].click();
        board[i][j].display();
      }
    }
  }
}

class Cell {
  float x, y;
  float w, h;
  int state = 0; //always starts blank

  // Cell Constructor
  Cell(float tempX, float tempY, float tempW, float tempH) {
    x = tempX;
    y = tempY;
    w = tempW;
    h = tempH;
  }

  void click() {
    if (state==0) {
      if (mouseX > x && mouseX < x+w &&
        mouseY > y && mouseY < y+h && mousePressed) {
        mousePressed = false;
        state = 1;
      }
    }
  }

  void display() {
    fill(255);
    rect(x, y, w, h);
    if (state == 1) { //draw an X
      line(x, y, x+w, y+h);
      line(x, y+h, x+w, y);
    }
  }