static void Draw()
{
var screen = new Text.StringBuilder(new string(' ', PlayWid * PlayHgt));
for (int i = 0; i < leftPaddleHeight; i++)
{
screen[(leftPaddleY + i) * PlayWid + leftPaddleX] = '█';
}
for (int i = 0; i < rghtPaddleHeight; i++)
{
screen[(rghtPaddleY + i) * PlayWid + rghtPaddleX] = '█';
}
screen[ballY * PlayWid + ballX] = '█';
string s = leftScore.ToString();
screen.Replace(new string(' ', s.Length), s, 1, s.Length);
string t = rghtScore.ToString();
screen.Replace(new string(' ', t.Length), t, PlayWid - t.Length - 1, t.Length);
Console.CursorVisible = false;
Console.SetCursorPosition(0, 0);
Console.Write(screen);
}