PrinceGame.Sprite.isGround C# (CSharp) Method

        public void isGround()
        {
            if (IsAlive == false)
            {
                return;
            }

            m_isOnGround = false;

            RoomNew room = null;
            Rectangle playerBounds = _position.Bounding;
            Vector2 v2 = SpriteRoom.getCenterTile(playerBounds);
            Rectangle tileBounds = SpriteRoom.GetBounds(Convert.ToInt32(Math.Truncate(v2.X)), Convert.ToInt32(Math.Truncate(v2.Y)));

            //Check if kid outside Room
            if (v2.X < 0)
            {
                room = Maze.LeftRoom(SpriteRoom);
            }
            else
            {
                room = SpriteRoom;
            }

            if (v2.Y > 2)
            {
                m_isOnGround = false;
            }
            else if (v2.Y < 0)
            {
                m_isOnGround = false;
            }
            else
            {
                if (room.GetCollision(Convert.ToInt32(Math.Truncate(v2.X)), Convert.ToInt32(Math.Truncate(v2.Y))) != Enumeration.TileCollision.Passable)
                {
                    if (playerBounds.Bottom >= tileBounds.Bottom)
                    {
                        m_isOnGround = true;
                    }
                }
            }

            if (m_isOnGround == false)
            {
                if (sprite.sequence.raised == false)
                {
                    if (spriteState.Value().state == Enumeration.State.runjump)
                    {
                        spriteState.Add(Enumeration.State.rjumpfall, Enumeration.PriorityState.Force);
                        sprite.PlayAnimation(spriteSequence, spriteState.Value());
                    }
                    else
                    {
                        if (spriteState.Previous().state == Enumeration.State.runjump)
                        {
                            spriteState.Add(Enumeration.State.stepfall, Enumeration.PriorityState.Force, new Vector2(20, 15));
                        }
                        else if (spriteState.Value().state != Enumeration.State.freefall)
                        {
                            spriteState.Add(Enumeration.State.stepfall, Enumeration.PriorityState.Force);
                        }
                    }
                    //SpriteRoom.LooseShake();
                    //and for upper room...
                    SpriteRoom.maze.UpRoom(SpriteRoom).LooseShake();
                }
                return;
            }

            //IS ON GROUND!
            if (spriteState.Value().state == Enumeration.State.freefall)
            {

                //Align to tile x
                _position.Y = tileBounds.Bottom - _position._spriteRealSize.Y;

                //CHECK IF LOOSE ENERGY...
                int Rem = 0;
                Rem = Convert.ToInt32(Math.Truncate(Math.Abs(Position.Y - PositionFall.Y))) / Tile.REALHEIGHT;

                if (Rem == 0)
                {
                    ((SoundEffect)Maze.dContentRes["Sounds/dos/falling echo".ToUpper()]).Play();
                }
                else if (Rem >= 1 & Rem < 3)
                {
                    ((SoundEffect)Maze.dContentRes["Sounds/dos/loosing a life falling".ToUpper()]).Play();
                }
                else
                {
                    ((SoundEffect)Maze.dContentRes["Sounds/dos/falling".ToUpper()]).Play();
                    //you should dead!!!
                    DeadFall();
                }
                Energy = Energy - Rem;
                spriteState.Add(Enumeration.State.crouch, Enumeration.PriorityState.Force, false);
                SpriteRoom.LooseShake();
            }
        }