Oyyou.MonoGameTutorials/MonoGame_Tutorials/Tutorial010/Sprites/Bat.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using Microsoft.Xna.Framework.Input;

namespace Tutorial010.Sprites
{
  public class Bat : Sprite
  {
    public Bat(Texture2D texture)
      : base(texture)
    {
      Speed = 5f;
    }

    public override void Update(GameTime gameTime, List<Sprite> sprites)
    {
      if (Input == null)
        throw new Exception("Please give a value to 'Input'");

      if (Keyboard.GetState().IsKeyDown(Input.Up))
        Velocity.Y = -Speed;
      else if (Keyboard.GetState().IsKeyDown(Input.Down))
        Velocity.Y = Speed;

      Position += Velocity;

      Position.Y = MathHelper.Clamp(Position.Y, 0, Game1.ScreenHeight - _texture.Height);

      Velocity = Vector2.Zero;
    }
  }
}