/// <summary>
/// Updates the menu entry locations.
/// </summary>
protected void UpdateMenuEntryLocations()
{
// Make the menu slide into place during transitions, using a
// power curve to make things look more interesting (this makes
// the movement slow down as it nears the end).
float transitionOffset = (float)Math.Pow(this.TransitionPosition, 2);
// start at Y = 175; each X value is generated per entry
Vector2 position = new Vector2(0f, 310);
// update each menu entry's location in turn
for (int i = 0; i < this._menuEntries.Count; i++)
{
AnswerEntry menuEntry = this._menuEntries[i];
// each entry is to be centered horizontally
position.X = this.ScreenManager.GraphicsDevice.Viewport.Width / 2 - menuEntry.GetWidth(this) / 2;
if (ScreenState == ScreenState.TransitionOn)
{
position.X -= transitionOffset * 256;
}
else
{
position.X += transitionOffset * 512;
}
// set the entry's position
menuEntry.Position = position;
// move down for the next entry the size of this entry
position.Y += menuEntry.GetHeight(this);
}
}
/// <summary>
/// Setups the next question.
/// </summary>
private void SetupNextQuestion()
{
// First, detach from the existing entries
if (_menuEntries != null)
{
_menuEntries.ForEach(e => e.Selected -= entry_Selected);
}
// Now, load and hook up the new ones
if (_questions.Count > 0)
{
_currentQuestion = _questions.Pop();
this._menuEntries = new List <AnswerEntry>();
foreach (Answer answer in _currentQuestion.Answers)
{
AnswerEntry entry = new AnswerEntry(answer);
entry.Selected += entry_Selected;
this._menuEntries.Add(entry);
}
}
else
{
// No more questions? No more game!
ExitScreen();
}
}
/// <summary>
/// Handles the Selected event of the entry control.
/// </summary>
/// <param name="sender">The source of the event.</param>
/// <param name="e">The <see cref="PlayerIndexEventArgs"/> instance containing the event data.</param>
void entry_Selected(object sender, PlayerIndexEventArgs e)
{
AnswerEntry entry = (AnswerEntry)sender;
if (entry.IsCorrect)
{
_correctSound.Play();
Player.AddToScore(_correctAnswerPoints);
}
else
{
_incorrectSound.Play();
_quizTimer.SubtractTime(_incorrectAnswerTime);
}
SetupNextQuestion();
}
/// <summary>
/// This is called when the screen should draw itself.
/// </summary>
/// <param name="gameTime">Time passed since the last call to Draw.</param>
public override void Draw(Microsoft.Xna.Framework.GameTime gameTime)
{
base.Draw(gameTime);
_quizTimer.Draw(ScreenManager.SpriteBatch);
// make sure our entries are in the right place before we draw them
this.UpdateMenuEntryLocations();
GraphicsDevice graphics = this.ScreenManager.GraphicsDevice;
SpriteBatch spriteBatch = this.ScreenManager.SpriteBatch;
SpriteFont font = this.ScreenManager.Font;
spriteBatch.Begin();
// Draw each menu entry in turn.
for (int i = 0; i < this._menuEntries.Count; i++)
{
AnswerEntry menuEntry = this._menuEntries[i];
bool isSelected = this.IsActive && (i == this._selectedEntry);
menuEntry.Draw(this, isSelected, gameTime);
}
// Make the menu slide into place during transitions, using a
// power curve to make things look more interesting (this makes
// the movement slow down as it nears the end).
float transitionOffset = (float)Math.Pow(this.TransitionPosition, 2);
// Draw the menu title centered on the screen
Vector2 titlePosition = new Vector2(graphics.Viewport.Width / 2, 120);
Vector2 titleOrigin = font.MeasureString(this._currentQuestion.QuestionText) / 2;
Color titleColor = new Color(192, 192, 192) * this.TransitionAlpha;
float titleScale = 1.25f;
titlePosition.Y -= transitionOffset * 100;
spriteBatch.DrawString(font, this._currentQuestion.QuestionText, titlePosition, titleColor, 0,
titleOrigin, titleScale, SpriteEffects.None, 0);
spriteBatch.End();
}
