/// <summary>
/// Allows the game to run logic such as updating the world,
/// checking for collisions, gathering input, and playing audio.
/// </summary>
/// <param name="gameTime">Provides a snapshot of timing values.</param>
protected override void Update(GameTime gameTime)
{
// Allows the game to exit
if (GamePad.GetState(PlayerIndex.One).Buttons.Back == ButtonState.Pressed)
{
this.Exit();
}
//poll the acceleration value
Vector3 acceleration = Accelerometer.GetState().Acceleration;
logoVelocity.X += acceleration.X;
logoVelocity.Y += -acceleration.Y;
logoPosition += logoVelocity;
// keep the sprite on the screen - clamp X
Viewport viewport = graphics.GraphicsDevice.Viewport;
if (logoPosition.X < 0)
{
logoPosition.X = 0;
logoVelocity.X = 0;
}
else if (logoPosition.X > viewport.Width - asteroidTexture.Width)
{
logoPosition.X = viewport.Width - asteroidTexture.Width;
logoVelocity.X = 0;
}
// keep the sprite on the screen - clamp Y
if (logoPosition.Y < 0)
{
logoPosition.Y = 0;
logoVelocity.Y = 0;
}
else if (logoPosition.Y > viewport.Height - asteroidTexture.Height)
{
logoPosition.Y = viewport.Height - asteroidTexture.Height;
logoVelocity.Y = 0;
}
base.Update(gameTime);
}