public void Update(GameTime gameTime)
{
_keyboardState = Keyboard.GetState();
_time += gameTime.ElapsedGameTime;
if (_keyboardState.IsKeyDown(Keys.Space) && _oldKeyboardState.IsKeyUp(Keys.Space) && _skippable)
NextImage();
switch (_imageState)
{
case TitleImageState.FadingIn:
if (_time >= _fadeSpeed)
{
_imageState = TitleImageState.FullAlpha;
_time = TimeSpan.Zero;
_currentAlpha = 1;
}
else
_currentAlpha = MathHelper.Lerp(0, 1, (float)_time.Ticks / (float)_fadeSpeed.Ticks);
break;
case TitleImageState.FullAlpha:
if (_time >= _displayDuration)
{
_imageState = TitleImageState.FadingOut;
_time = TimeSpan.Zero;
}
break;
case TitleImageState.FadingOut:
if (_time >= _fadeSpeed)
NextImage();
else
_currentAlpha = MathHelper.Lerp(1, 0, (float)_time.Ticks / (float)_fadeSpeed.Ticks);
break;
}
_oldKeyboardState = _keyboardState;
}
private void NextImage()
{
_time = TimeSpan.Zero;
_currentImage++;
_currentAlpha = 0;
_imageState = TitleImageState.FadingIn;
if (_currentImage >= _images.Count)
Finished = true;
}
