public GamePage()
{
this.InitializeComponent();
//set preffered window size
ApplicationView.PreferredLaunchViewSize = new Size(700, 500);
ApplicationView.PreferredLaunchWindowingMode = ApplicationViewWindowingMode.PreferredLaunchViewSize;
//initialize variable for gameplay
playerLives = 3;
playerGameScore = 0;
level = 1;
//initiate classes
player = new Player(canvas, playerGameScore);
invaders = new Invaders(canvas, level);
sounds = new Sounds(grid);
//start the game dispatch timer
dispatcherTimer = new DispatcherTimer();
dispatcherTimer.Tick += Game;
dispatcherTimer.Interval = TimeSpan.FromTicks(TimeSpan.TicksPerSecond / 30);
dispatcherTimer.Start();
}
//Draw and update all object for every game frame
public void Draw(Canvas canvas, Image[,] invaderGrid, Sounds sounds)
{
Canvas.SetTop(playerSprite, Window.Current.Bounds.Height - (playerSprite.Height * 2));
//If player is moving left and is not hitting the left screen, keep moving left.
if (isMovingLeft && Canvas.GetLeft(playerSprite) >= 0) Canvas.SetLeft(playerSprite, Canvas.GetLeft(playerSprite) - 6);
//If player is moving right and is not hitting the right screen, keep moving right
if (isMovingRight && Canvas.GetLeft(playerSprite) <= Window.Current.Bounds.Width - playerSprite.Width) Canvas.SetLeft(playerSprite, Canvas.GetLeft(playerSprite) + 6);
//if the player is shooting
if (isShooting)
{
//If no bullet is found, create a new one.
if (!canvas.Children.Contains(playerBullet))
{
playerBullet = new Image();
playerBullet.Width = 3 * sizeModifier();
playerBullet.Height = 8 * sizeModifier();
playerBullet.Source = new BitmapImage(new Uri("ms-appx:///Assets/Sprites/player-bullet.png"));
Canvas.SetTop(playerBullet, Canvas.GetTop(playerSprite));
Canvas.SetLeft(playerBullet, Canvas.GetLeft(playerSprite) + (playerSprite.Width / 2 - 1));
sounds.playPlayerShootSound();
canvas.Children.Add(playerBullet);
}
//Move bullet upward and check for alienGrid collision.
for (int r = 0; r < invaderGrid.GetLength(0); r++)
{
for (int c = 0; c < invaderGrid.GetLength(1); c++)
{
//If the player bullet is in between the x coords of an invader, continue
if (Canvas.GetLeft(invaderGrid[r, c]) <= Canvas.GetLeft(playerBullet) && Canvas.GetLeft(invaderGrid[r, c]) + invaderGrid[r, c].Width >= Canvas.GetLeft(playerBullet))
{
//If the player bullet is in between the y coords of an invader, continue
if (Canvas.GetTop(invaderGrid[r, c]) + invaderGrid[r, c].Height >= Canvas.GetTop(playerBullet) && Canvas.GetTop(invaderGrid[r, c]) <= Canvas.GetTop(playerBullet))
{
//If the invader is not already dead, continue
if (invaderGrid[r, c].Tag != null)
{
//Kill invader / update player score
playerScore = playerScore + (10 * (invaderGrid.GetLength(1) - c));
if (invaderGrid[r, c].Source == alien1A || invaderGrid[r, c].Source == alien1B) playerScore = playerScore + 100;
else if (invaderGrid[r, c].Source == alien2A || invaderGrid[r, c].Source == alien2B) playerScore = playerScore + 50;
else playerScore = playerScore + 25;
isShooting = false;
invaderGrid[r, c].Tag = null;
sounds.playinvaderKilledSound();
canvas.Children.Remove(playerBullet);
removeKilled(canvas, invaderGrid[r, c]);
}
}
}
//If the bullet collides with the top of the screen, remove bullet
else if (Canvas.GetTop(playerBullet) <= 0)
{
isShooting = false;
canvas.Children.Remove(playerBullet);
}
}
}
//Move bullet upward
Canvas.SetTop(playerBullet, Canvas.GetTop(playerBullet) - 15);
}
}
//Draw and update all object for every game frame
public void Draw(Canvas canvas, Image player, Sounds sounds)
{
//For every 15 loops (minus the speed) toggle the invader image and move it
if (count % (15 - speed) == 1) toggleSprite = invadersAreMoving = true;
//For every 20 loops (minus the speed) make a selected invader shoot if the randomNumber is equal to 2
if (count % (20 - speed) == 1 && new Random().Next(0, 3) == 2) invaderShoot(canvas, player);
//Move the invader downward
if (isMovingDown)
{
for (int c = 0; c < columns; c++)
{
for (int r = 0; r < rows; r++)
{
isMovingDown = false;
Canvas.SetTop(invaderGrid[c, r], Canvas.GetTop(invaderGrid[c, r]) + invaderGrid[c, r].Width);
//If the invader is not dead, continue
if (invaderGrid[c, r].Tag != null)
{
if (Canvas.GetTop(invaderGrid[c, r]) >= Window.Current.Bounds.Height - (invaderGrid[c, r].Height * 3))
{
isPlayerAlive = false;
}
}
}
}
}
//change the x coords for all the invaders
if (invadersAreMoving)
{
//Invaders are moving left
if (isMovingLeft)
{
for (int c = 0; c < columns; c++)
{
for (int r = 0; r < rows; r++)
{
if (invaderGrid[c, r].Tag != null)
{
if (toggleSprite) toggle(invaderGrid[c, r]);
if (Canvas.GetLeft(invaderGrid[c, r]) <= 0 + (invaderGrid[c, r].Width * 2))
{
isMovingDown = true;
isMovingLeft = false;
}
Canvas.SetLeft(invaderGrid[c, r], Canvas.GetLeft(invaderGrid[c, r]) - (20 + speed));
}
}
}
}
//Invaders are moving right
else
{
for (int c = 0; c < columns; c++)
{
for (int r = 0; r < rows; r++)
{
if (invaderGrid[c, r].Tag != null)
{
if (toggleSprite) toggle(invaderGrid[c, r]);
if (Canvas.GetLeft(invaderGrid[c, r]) >= Window.Current.Bounds.Width - (invaderGrid[c, r].Width * 3))
{
isMovingDown = true;
isMovingLeft = true;
}
Canvas.SetLeft(invaderGrid[c, r], Canvas.GetLeft(invaderGrid[c, r]) + (20 + speed));
}
}
}
}
invadersAreMoving = false;
}
//Handle bullet collision and motion
if (isShooting)
{
for (int i = 0; i < invaderBullets.Length; i++)
{
if (canvas.Children.Contains(invaderBullets[i]))
{
//If the invader bullet is in between the x coords of the player, continue
if (Canvas.GetLeft(player) <= Canvas.GetLeft(invaderBullets[i]) && Canvas.GetLeft(player) + player.Width >= Canvas.GetLeft(invaderBullets[i]))
{
//If the invader bullet is in between the y coords of the player, continue
if (Canvas.GetTop(player) + player.Height >= Canvas.GetTop(invaderBullets[i]) && Canvas.GetTop(player) <= Canvas.GetTop(invaderBullets[i]))
{
//Kill the player
removeKilled(player);
sounds.playPlayerKilledSound();
isShooting = false;
}
}
//If the invader bullet collides with the bottom screen, continue
else if (Canvas.GetTop(invaderBullets[i]) >= Window.Current.Bounds.Height - invaderBullets[i].Height)
{
//delete bullet
canvas.Children.Remove(invaderBullets[i]);
}
//Move bullet downward
Canvas.SetTop(invaderBullets[i], Canvas.GetTop(invaderBullets[i]) + 15);
}
}
}
toggleSprite = false;
count++;
}