void draw(Graphics g) {
int width = world.squareWidth(), height = world.squareHeight();
int x = this.column * width, y = this.row * height;
g.setColor(this.color);
g.fillRect(x, y, width, height);
g.setColor(Color.WHITE);
g.drawRect(x, y, width, height);
g.setColor(Color.BLACK);
}
