/// <summary>
/// Reads the saved game from the save file, and restores the components'
/// positions and values from it
/// </summary>
public bool LoadGame()
{
string lineContent = "";
string[] bits;
if (!File.Exists(Shared.saveFileName))
{
// display error message, return to the start scene
return(false);
}
using (StreamReader reader = new StreamReader(Shared.saveFileName))
{
if (reader.EndOfStream)
{
// display empty file message
}
else
{
try
{
int counter = 0;
//initiate player's name
lineContent = reader.ReadLine();
Shared.playerName = lineContent;
// initiate score
lineContent = reader.ReadLine();
Shared.score = int.Parse(lineContent);
// add spaceship
lineContent = reader.ReadLine();
bits = lineContent.Split('|');
shattle.Position = new Vector2(float.Parse(bits[0]), float.Parse(bits[1]));
shattle.Rotation = float.Parse(bits[2]);
shattle.Visible = true;
shattle.Enabled = true;
// initialize pot of gold
lineContent = reader.ReadLine();
bits = lineContent.Split('|');
if (bits[0] != "none")
{
pot.Position = new Vector2(float.Parse(bits[0]), float.Parse(bits[1]));
pot.Enabled = true;
pot.Visible = true;
Shared.goldOnScreen = true;
}
Shared.timerGold = float.Parse(bits[2]);
lineContent = reader.ReadLine();
Shared.timerAddAsteroid = float.Parse(lineContent);
//add the asteroids
do
{
lineContent = reader.ReadLine();
bits = lineContent.Split('|');
if (counter < 5)
{
asteroids[counter].Position = new Vector2(float.Parse(bits[0]), float.Parse(bits[1]));
asteroids[counter].Movement = new Vector2(float.Parse(bits[2]), float.Parse(bits[3]));
asteroids[counter].Visible = true;
asteroids[counter].Enabled = true;
}
else
{
Asteroid a = new Asteroid(game, spriteBatch,
game.Content.Load <Texture2D>("Images/asteroid"),
new Vector2(float.Parse(bits[0]), float.Parse(bits[1])),
new Vector2(float.Parse(bits[2]), float.Parse(bits[3])));
a.Visible = true;
a.Enabled = true;
asteroids.Add(a);
Components.Add(a);
}
counter++;
} while (!reader.EndOfStream);
cm.Enabled = true;
MediaPlayer.Play(backgroundMusic);
background = game.Content.Load <Texture2D>("Images/background");
}
catch
{
// display error message
}
}
}
return(true);
}
/// <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>
public override void Update(GameTime gameTime)
{
// when Esc is pressed, a message box appears and asks if the user wants
// to save the game before leaving
if (Keyboard.GetState().IsKeyDown(Keys.Escape) && !Shared.isPaused)
{
Shared.isPaused = true;
game.Components.Add(messageBox);
game.Components.Add(messageBox.ButtonYes);
game.Components.Add(messageBox.ButtonNo);
game.Components.Add(messageBox.ButtonCancel);
}
// every 15 seconds a new asteroid is generated
if (Shared.timerAddAsteroid >= Shared.periodAddAsteroid)
{
Random r = new Random();
int startInt = r.Next(0, (int)Shared.stageScene.X);
int endInt = r.Next(0, (int)Shared.stageScene.Y);
float speed = r.Next(1, 3);
Vector2 direction = new Vector2(endInt - startInt, Shared.stageScene.Y);
direction.Normalize();
asteroid = new Asteroid(game, spriteBatch, game.Content.Load <Texture2D>("Images/asteroid"),
new Vector2(startInt, 0), speed * direction);
asteroid.Visible = true;
asteroid.Enabled = true;
asteroids.Add(asteroid);
Components.Add(asteroid);
Shared.timerAddAsteroid = 0;
}
// pots appear and disappear from the screen only when the game is not paused
if (!Shared.isPaused)
{
Shared.timerAddAsteroid += gameTime.ElapsedGameTime.TotalSeconds;
Shared.timerGold += gameTime.ElapsedGameTime.TotalSeconds;
// after each 10 seconds the gold pot was off the screen a new gold pot is added in
// a random location
if (!Shared.goldOnScreen && Shared.timerGold >= Shared.periodGoldShow && !Shared.gameOver)
{
Random r = new Random();
int x = r.Next(goldTex.Width / 2, (int)Shared.stageScene.X - goldTex.Width);
int y = r.Next(goldTex.Height / 2, (int)Shared.stageScene.Y - goldTex.Height);
Rectangle goldRct = new Rectangle(x, y, goldTex.Width, goldTex.Height);
while (goldRct.Intersects(shattle.GetBounds()))
{
x = r.Next(0, (int)Shared.stageScene.X - goldTex.Width);
y = r.Next(0, (int)Shared.stageScene.Y - goldTex.Height);
goldRct = new Rectangle(x, y, goldTex.Width, goldTex.Height);
}
pot.Position = new Vector2(x, y);
pot.Visible = true;
pot.Enabled = true;
Shared.goldOnScreen = true;
Shared.timerGold = 0;
}
// after spending 5 sec on the screen, the pot disappears
if (Shared.goldOnScreen && Shared.timerGold >= Shared.periodGoldHide)
{
pot.Enabled = false;
pot.Visible = false;
pot.Position = Shared.offScreen;
Shared.goldOnScreen = false;
Shared.timerGold = 0;
}
}
// if a collision was detected, render an explosion animation
if (Shared.exploded != Vector2.Zero)
{
explosion = new Explosion(game, spriteBatch, game.Content.Load <Texture2D>("Images/explosion"),
Shared.exploded - new Vector2(15, 15));
Components.Add(explosion);
pot.Position = Shared.offScreen;
pot.Visible = false;
pot.Enabled = false;
Shared.timerGold = 0;
Shared.exploded = Vector2.Zero;
}
// after the explosion animation was rendered, we display Game Over screen for 3 sec
// after which the exit to the start scene is initiated
if (Shared.gameOver == true)
{
MediaPlayer.Stop();
if (Shared.startGameOverSound)
{
SoundEffect gameOver = game.Content.Load <SoundEffect>("Audio/game-over-arcade");
gameOver.Play();
Shared.startGameOverSound = false;
}
background = game.Content.Load <Texture2D>("Images/GameOver");
for (int i = 0; i < asteroids.Count; i++)
{
asteroids[i].Enabled = false;
asteroids[i].Visible = false;
asteroids[i].Position = Shared.offScreen;
}
if (Shared.timerAddAsteroid >= 5.0f)
{
SaveScore();
MediaPlayer.Stop();
RemoveComponents();
ResetGlobalVariables();
Shared.exitInitiated = true;
Shared.gameOver = false;
}
}
// if the exit from game was initiated by user, game is saved (if requested),
// components removed and global variable reset
if (Shared.removeItems)
{
if (Shared.saveGame)
{
SaveGame();
Shared.saveGame = false;
}
RemoveComponents();
ResetGlobalVariables();
MediaPlayer.Stop();
Shared.removeItems = false;
Shared.exitInitiated = true;
}
base.Update(gameTime);
}