Example #1
0
        // on updates do animations and controls
        protected override void Update(double deltaTime)
        {
            // if user click 'exit' action, exit game
            if (Input.Down("exit"))
            {
                Game.Exit();
            }

            // skip frames with too much delta
            if (deltaTime > 1)
            {
                return;
            }

            // get window size
            var windowSize = Gfx.WindowSize;

            // move ball
            _ballPosition.AddSelf(_ballSpeed.Multiply((float)deltaTime * 235f));
            if (_ballPosition.X < 0)
            {
                _ballSpeed.X = Math.Abs(_ballSpeed.X);
            }
            if (_ballPosition.X > windowSize.X)
            {
                _ballSpeed.X = -Math.Abs(_ballSpeed.X);
            }
            if (_ballPosition.Y < 0)
            {
                _ballSpeed.Y = Math.Abs(_ballSpeed.Y);
            }
            if (_ballPosition.Y > windowSize.Y + 250)
            {
                _ballSpeed.Y = -Math.Abs(_ballSpeed.Y);
            }
            _isBallOut = _ballPosition.Y > windowSize.Y;

            // if ball out, reset speed
            if (_isBallOut && Math.Abs(_ballSpeed.X) > 1f)
            {
                _ballSpeed.X = 1;
            }

            // update explosions
            foreach (Explosion exp in _explosions)
            {
                if (exp.Radius > 10)
                {
                    exp.Color.A -= (float)deltaTime * 1.25f;
                }
                exp.Radius += (float)deltaTime * 150f;
            }
            _explosions.RemoveAll(x => x.Color.A < 0);

            // player movement speed
            var   playerSpeed    = 350f;
            float playerVelocity = 0f;

            // do player movement
            if (!_isBallOut)
            {
                // move player left
                if (_player.Left > 0 && Input.Down("left"))
                {
                    playerVelocity -= (float)deltaTime * playerSpeed;
                }
                // move player right
                if (_player.Right < windowSize.X && Input.Down("right"))
                {
                    playerVelocity += (float)deltaTime * playerSpeed;
                }
            }

            // update player position
            _player.X += playerVelocity;

            // test collision with blocks
            Block collidedBlock = null;

            foreach (var block in _blocks)
            {
                // check collision with block + some extra margin
                var rect = block.Rectangle;
                rect.X      -= 5;
                rect.Width  += 10;
                rect.Y      -= 5;
                rect.Height += 10;

                // ball hit block
                if (rect.Contains(_ballPosition))
                {
                    AddExplosion(_ballPosition, block.Color);
                    collidedBlock = block;
                    if ((_ballPosition.Y < block.Rectangle.Top + 6) || (_ballPosition.Y > block.Rectangle.Bottom - 6))
                    {
                        _ballSpeed.Y *= -1;
                    }
                    if ((_ballPosition.X < block.Rectangle.Left + 5) || (_ballPosition.X > block.Rectangle.Right - 5))
                    {
                        _ballSpeed.X *= -1;
                    }
                    break;
                }
            }
            if (collidedBlock != null)
            {
                _blocks.Remove(collidedBlock);
            }

            // test collision with player paddle
            if (_ballSpeed.Y > 0)
            {
                // create a slightly larger rect for player collision
                var playerCollision = _player;
                playerCollision.X      -= 10;
                playerCollision.Width  += 10;
                playerCollision.Y      -= 10;
                playerCollision.Height += 15;

                // check if hit ball
                if (playerCollision.Contains(_ballPosition))
                {
                    // update ball speed
                    _ballSpeed.Y  = -_ballSpeed.Y;
                    _ballSpeed.X += playerVelocity * 0.1f;

                    // special case for corners
                    if (_ballPosition.X < _player.Left + 10)
                    {
                        if (_ballSpeed.X > 0)
                        {
                            _ballSpeed.X = 0f;
                        }
                        _ballSpeed.X -= 0.65f;
                        AddExplosion(_ballPosition, new Color(1f, 0.5f, 0f, 1f));
                    }
                    else if (_ballPosition.X > _player.Right - 10)
                    {
                        if (_ballSpeed.X < 0)
                        {
                            _ballSpeed.X = 0f;
                        }
                        _ballSpeed.X += 0.65f;
                        AddExplosion(_ballPosition, new Color(1f, 0.5f, 0f, 1f));
                    }
                }
            }
        }