Tic-Tac-Toe(OX)

void setup()
{
  size(600, 600);
  background(255);
  strokeWeight(8);
  stroke(0);
  int i, j ,xPos ,yPos;
  int xLine, yLine;
  int[][] Pieces=new int[3][3];
  for (xLine=200,yLine=200 ; xLine<=400 && yLine<=400 ; xLine+=200,yLine+=200)
  {
    line(xLine, 0, xLine, height);
    line(0, yLine, width, yLine);
  }
  for (i=0,xPos=100;i<Pieces.length;i++,xPos+=200)
  {
    for (j=0,yPos=100;j<Pieces.length;j++,yPos+=200)
    {
      Pieces[i][j]=int(random(0,2));
      if (Pieces[i][j]%2==0)
        {DrawO(xPos, yPos);}
      else DrawX(xPos, yPos);
  }
  }
}

void DrawO(int x, int y)
{
  int r=180;
  strokeWeight(1);
  stroke(0);
  fill(0);
  ellipse(x, y, r, r);
  fill(255);
  ellipse(x, y, r-15, r-15);
}

void DrawX(int x, int y)
{
  strokeWeight(8);
  line(x-90, y-90, x+90, y+90);
  line(x-90, y+90, x+90, y-90);
}