bool GameField::isPathOpen(const Vec2Tile & from, const Vec2Tile & to) const
{
	int l, dx, dy;
	int xr = abs(to.x - from.x);
	int yr = abs(to.y - from.y);

	if (xr > yr)
	{
		l = xr;
	}
	else
	{
		l = yr;
	}

	int px = (from.x << 12) + (1 << 11);
	int py = (from.y << 12) + (1 << 11);
	int ex = (to.x << 12) + (1 << 11);
	int ey = (to.y << 12) + (1 << 11);

	if (l != 0)
	{
		dx = (ex - px) / l;
		dy = (ey - py) / l;
	}
	else
	{
		dx = 0;
		dy = 0;
	}

	for (int i = 0; i <= l; i++)
	{
		if (!getTileAt(Vec2Tile(px >> 12, py >> 12)).isOpen())
			return false;

		px += dx;
		py += dy;
	}

	return true;
}