/// <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();
}
// These statements check to see if there are any invaders remaining to shoot
bool IsInvaderRemaining = false;
for (int Count = 0; Count < 11; Count++)
{
if (Invaders[Count] != null)
{
IsInvaderRemaining = true;
break;
}
}
// If there are no invaders then move to end game state
if (!IsInvaderRemaining)
{
this.Exit();
}
if (MissileFired != null)
{
MissileFired.Move();
}
if (Keyboard.GetState().IsKeyDown(Keys.Space))
{
MissileFired = new Missile(RocketXPos, 650);
}
// TODO: Add your update logic here
if (Keyboard.GetState().IsKeyDown(Keys.Left))
{
RocketXPos = RocketXPos - 4;
}
if (Keyboard.GetState().IsKeyDown(Keys.Right))
{
RocketXPos = RocketXPos + 4;
}
if (RocketXPos < 100)
{
RocketXPos = 100;
}
if (RocketXPos > 924)
{
RocketXPos = 924;
}
Ticks = Ticks + gameTime.ElapsedGameTime.TotalMilliseconds;
if (Ticks > 500)
{
for (int Count = 0; Count < 11; Count++)
{
if (Invaders[Count] != null)
{
Invaders[Count].MoveHorizontal(AlienSpeed * AlienDirection);
}
}
Invader LeftMostInvader = null;
Invader RightMostInvader = null;
for (int Count = 0; Count < 11; Count++)
{
if (Invaders[Count] != null)
{
LeftMostInvader = Invaders[Count];
break;
}
}
for (int Count = 10; Count > 0; Count--)
{
if (Invaders[Count] != null)
{
RightMostInvader = Invaders[Count];
break;
}
}
if (LeftMostInvader.GetXPos() < 96)
{
AlienDirection = +1;
int XPos = 96;
for (int Count = 0; Count < 11; Count++)
{
if (Invaders[Count] != null)
{
Invaders[Count].MoveVertical(4);
Invaders[Count].SetXPos(XPos);
}
XPos = XPos + InvaderImg.Width;
}
}
if (RightMostInvader.GetXPos() > 924)
{
AlienDirection = -1;
int XPos = 924 - InvaderImg.Width * 10;
for (int Count = 0; Count < 11; Count++)
{
if (Invaders[Count] != null)
{
Invaders[Count].MoveVertical(4);
Invaders[Count].SetXPos(XPos);
}
XPos = XPos + InvaderImg.Width;
}
}
Ticks = 0;
}
if (MissileFired != null)
{
Rectangle rectMissile = new Rectangle((int)MissileFired.GetPosition().X, (int)MissileFired.GetPosition().Y, MissileImg.Width, MissileImg.Height);
for (int Count = 0; Count < 11; Count++)
{
if (Invaders[Count] != null)
{
Rectangle rectInvader = new Rectangle(Invaders[Count].GetXPos(), Invaders[Count].GetYPos(), InvaderImg.Width, InvaderImg.Height);
if (rectMissile.Intersects(rectInvader))
{
Invaders[Count] = null;
MissileFired = null;
break;
}
}
}
}
base.Update(gameTime);
}
//Update method for Gameplay screen
// TODO: Add your update logic here
public void UpdatePlaying(GameTime currentTime)
{
// Allows the game to exit
if (GamePad.GetState(PlayerIndex.One).Buttons.Back == ButtonState.Pressed)
{
GameState = 3;
return;
}
//Implemented to make testing easier
//easily switch through different game states
if (Keyboard.GetState().IsKeyDown(Keys.F1))
{
StarwarsSoundInstance.Stop();
GameState = 1;
return;
}
if (Keyboard.GetState().IsKeyDown(Keys.F2))
{
GameState = 2;
return;
}
if (Keyboard.GetState().IsKeyDown(Keys.F3))
{
GameState = 3;
return;
}
if (Keyboard.GetState().IsKeyDown(Keys.F4))
{
GameState = 4;
return;
}
if (Keyboard.GetState().IsKeyDown(Keys.F5))
{
GameState = 5;
return;
}
//Allows switching between weapons (Also allows easier testing cos of faster gameplay)
if (Keyboard.GetState().IsKeyDown(Keys.D1))
{
WeaponsCount = 1;
Weapon1SoundInstance.Play();
}
if (Keyboard.GetState().IsKeyDown(Keys.D2))
{
WeaponsCount = 2;
Weapon2SoundInstance.Play();
}
// These statements check to see if there are any invaders remaining to shoot
bool IsBossInvaderRemaining = false;
if (BossAlien != null)
{
IsBossInvaderRemaining = true; //If statement checks if the Boss alien is still remaining
}
bool IsInvaderRemaining = false;
for (int Count = 0; Count < 11; Count++)
{
//First Array
if (Invaders[Count] != null) //If statement is null that means there are no Aliens left for that particular Array
{
IsInvaderRemaining = true;
break;
}
//Second Array
if (InvadersOne[Count] != null)
{
IsInvaderRemaining = true;
break;
}
//Third Array
if (InvadersTwo[Count] != null)
{
IsInvaderRemaining = true;
break;
}
//Fourth Array
if (InvadersThree[Count] != null)
{
IsInvaderRemaining = true;
break;
}
//Fifth Array
if (InvadersFour[Count] != null)
{
IsInvaderRemaining = true;
break;
}
}
// If there are no invaders then move to end game state (Gamestate 3)
if (!IsInvaderRemaining & !IsBossInvaderRemaining)
{
GameState = 3;
return;
}
//Player Missile
if (BossAlien != null & (WeaponsCount == 1 || WeaponsCount ==2)) //Checks if Boss Alien is destroyed and what weapon count it is on
{ //This allows weapons power up if Boss is destroyed and switching of weapons
if (MissileFired != null)
{
MissileFired.Move();
}
if (Keyboard.GetState().IsKeyDown(Keys.Space)) //Fires missile from the location of rocket, if Space bar is pressed
{
MissileFired = new Missile(RocketXPos, 650);
ShootSoundInstance.Play(); //Sound is also played
}
}
//Switch weapons //Used for testing to save time
if (WeaponsCount == 2)
{
if (MissileFired != null)
{
MissileFired.Move2();
}
if (Keyboard.GetState().IsKeyDown(Keys.Space))
{
MissileFired = new Missile(RocketXPos, 650);
Shoot3SoundInstance.Play();
}
}
//If Boss alien has been destroyed use second missile (Upgrade weapons/ Power up)
if (BossAlien == null)
{
if (MissileFired != null)
{
MissileFired.Move3();
}
if (Keyboard.GetState().IsKeyDown(Keys.Space))
{
MissileFired = new Missile(RocketXPos, 650);
if (WeaponsCount == 1)
{
Shoot2SoundInstance.Play();
}
}
}
//Alien Missile
if (AlienMissileFired != null) //If Alien missile is not equal to Null then alien missile starts moving
{
AlienMissileFired.Move();
}
if (AlienMissileFired2 != null)
{
AlienMissileFired2.Move();
}
if (AlienMissileFired3 != null)
{
AlienMissileFired3.Move();
}
if (AlienMissileFired4 != null)
{
AlienMissileFired4.Move();
}
if (BossMissileFired != null)
{
BossMissileFired.Move();
}
Timer = Timer + currentTime.ElapsedGameTime.Milliseconds; //Timer to control the automation of alien/Boss shooting
Timer2 = Timer2 + currentTime.ElapsedGameTime.Milliseconds;
Timer3 = Timer3 + currentTime.ElapsedGameTime.Milliseconds;
Timer4 = Timer4 + currentTime.ElapsedGameTime.Milliseconds;
BossTimer = BossTimer + currentTime.ElapsedGameTime.Milliseconds;
//First Array
if (Timer > 2865) //The timer values can be adjusted at each array to change the frequency of the automatic shooting
{
for (int Count = 0; Count < 11; Count++) //Checks the amount of aliens
{
if (Invaders[Count] != null) //If available then fires from alien at the player
{
AlienMissileFired = new AlienMissile(Invaders[Count].GetXPos(), Invaders[Count].GetYPos()); //Fires from the X and Y coordinates of existing aliens
AlienShootSoundInstance.Play();
Timer = 0; //Timer is reset back to 0 for continious shooting
}
}
}
//Second Array
if (Timer2 > 4234)
{
for (int Count = 0; Count < 11; Count++)
{
if (InvadersTwo[Count] != null)
{
AlienMissileFired2 = new AlienMissile(InvadersTwo[Count].GetXPos(), InvadersTwo[Count].GetYPos());
AlienShootSoundInstance.Play();
Timer2 = 0;
}
}
}
//Third Array
if (Timer3 > 6403)
{
for (int Count = 0; Count < 11; Count++)
{
if (InvadersThree[Count] != null)
{
AlienMissileFired3 = new AlienMissile(InvadersThree[Count].GetXPos(), InvadersThree[Count].GetYPos());
AlienShootSoundInstance.Play();
Timer3 = 0;
}
}
}
//Fourth Array
if (Timer4 > 8000)
{
for (int Count = 0; Count < 11; Count++)
{
if (InvadersFour[Count] != null)
{
AlienMissileFired4 = new AlienMissile(InvadersFour[Count].GetXPos(), InvadersFour[Count].GetYPos());
AlienShootSoundInstance.Play();
Timer4 = 0;
}
}
}
//Boss Missile
if (BossTimer > 7800)
{
if (BossAlien != null)
{
BossMissileFired = new AlienMissile(BossAlien.GetXPos(), BossAlien.GetYPos());
BossShootSoundInstance.Play();
BossTimer = 0;
}
}
//Controls movement of the Aircraft and sound effects
if (Keyboard.GetState().IsKeyDown(Keys.Left))
{
if (BossAlien != null)
{
RocketXPos = RocketXPos - 4; //Changing this will affect the speed of the rocket
JetSoundInstance.Play();
}
if (BossLife == 2)
{
RocketXPos = RocketXPos - 5; //Upgrade if boss is hit (Move faster)
JetSoundInstance.Play();
}
if (BossLife == 1)
{
RocketXPos = RocketXPos - 6; //Upgrade if boss is hit (Move faster)
JetSoundInstance.Play();
}
if (BossAlien == null & BossLife == 0)
{
RocketXPos = RocketXPos - 8; //Upgrade if boss is destroyed (Move faster)
JetSoundInstance.Play();
}
}
if (Keyboard.GetState().IsKeyDown(Keys.Right))
{
if (BossAlien != null)
{
RocketXPos = RocketXPos + 4; //Changing this will affect the speed of the rocket
JetSoundInstance.Play();
}
if (BossLife == 2)
{
RocketXPos = RocketXPos + 5; //Upgrade if boss is hit (Move faster)
JetSoundInstance.Play();
}
if (BossLife == 1)
{
RocketXPos = RocketXPos + 6; //Upgrade if boss is hit (Move faster)
JetSoundInstance.Play();
}
if (BossAlien == null & BossLife == 0)
{
RocketXPos = RocketXPos + 8; //Upgrade if boss is destroyed (Move faster)
JetSoundInstance.Play();
}
}
if (RocketXPos < 100) //Limits the Rockets movement to prevent it from going off the screen
{
RocketXPos = 100;
}
if (RocketXPos > 924)
{
RocketXPos = 924;
}
//Controls movement of Alien
Ticks = Ticks + currentTime.ElapsedGameTime.TotalMilliseconds; //Calculates the ingame time for the movement of aliens
if (Ticks > 500) //if the timer is more than 500 then moves the alien horizontal
{
for (int Count = 0; Count < 11; Count++)
{
//First Array
if (Invaders[Count] != null)
{
Invaders[Count].MoveHorizontal(AlienSpeed * AlienDirection);
}
//second array
if (InvadersOne[Count] != null)
{
InvadersOne[Count].MoveHorizontal(AlienSpeed * AlienDirection);
}
//Third array
if (InvadersTwo[Count] != null)
{
InvadersTwo[Count].MoveHorizontal(AlienSpeed * AlienDirection);
}
//Fourth array
if (InvadersThree[Count] != null)
{
InvadersThree[Count].MoveHorizontal(AlienSpeed * AlienDirection);
}
//Fifth array
if (InvadersFour[Count] != null)
{
InvadersFour[Count].MoveHorizontal(AlienSpeed * AlienDirection);
}
}
//Boss Alien movement
if (Ticks > 500)
{
if (BossAlien != null)
{
BossAlien.MoveHorizontal(BossAlienSpeed * BossAlienDirection);
}
if (BossLife == 1)
{
BossAlienSpeed = 105;
BossAlien.MoveHorizontal(BossAlienSpeed * BossAlienDirection);
}
}
Invader LeftMostInvader = null; //Aliens set to null
Invader RightMostInvader = null;
for (int Count = 0; Count < 11; Count++)
{
//First Array
if (Invaders[Count] != null)
{
LeftMostInvader = Invaders[Count];
break;
}
//second array
if (InvadersOne[Count] != null)
{
LeftMostInvader = InvadersOne[Count];
break;
}
//Third array
if (InvadersTwo[Count] != null)
{
LeftMostInvader = InvadersTwo[Count];
break;
}
//Fourth array
if (InvadersThree[Count] != null)
{
LeftMostInvader = InvadersThree[Count];
break;
}
//Fifth array
if (InvadersFour[Count] != null)
{
LeftMostInvader = InvadersFour[Count];
break;
}
}
for (int Count = 10; Count > 0; Count--)
{
//First Array
if (Invaders[Count] != null)
{
RightMostInvader = Invaders[Count];
break;
}
//second array
if (InvadersOne[Count] != null)
{
RightMostInvader = InvadersOne[Count];
break;
}
//Third array
if (InvadersTwo[Count] != null)
{
RightMostInvader = InvadersTwo[Count];
break;
}
//Fourth array
if (InvadersThree[Count] != null)
{
RightMostInvader = InvadersThree[Count];
break;
}
//Fifth array
if (InvadersFour[Count] != null)
{
RightMostInvader = InvadersFour[Count];
break;
}
}
//Controls alien speed/difficulty
if (LeftMostInvader != null) //Checks if aliens is available
{
if (LeftMostInvader.GetYPos() > 200) //Increases alien speed after to goes pass a certain Y coordinate
{
AlienSpeed = 50;
}
}
if (RightMostInvader != null)
{
if (RightMostInvader.GetYPos() > 200)
{
AlienSpeed = 50;
}
}
if (LeftMostInvader != null)
{
if (LeftMostInvader.GetYPos() > 300)
{
AlienSpeed = 60;
}
}
if (RightMostInvader != null)
{
if (RightMostInvader.GetYPos() > 300)
{
AlienSpeed = 60;
}
}
//Game Over when aliens reach the bottom, navigates to Gameover screen
if (LeftMostInvader != null)
{
if (LeftMostInvader.GetYPos() > 550)
{
GameState = 4; //Goes to gameover screen
return;
}
}
if (RightMostInvader != null)
{
if (RightMostInvader.GetYPos() > 550)
{
GameState = 4;
return;
}
}
//Checks Boss alien direction
if (BossAlien != null)
{
if (BossAlien.GetXPos() < 96) //Limits the aliens direction to prevent it from going off the screen
{
BossAlienDirection = +1;
int BossXPos = 96;
if (BossAlien != null)
{
BossAlien.SetXPos(BossXPos);
}
BossXPos = BossXPos + BossInvaderImg.Width;
}
}
if (BossAlien != null)
{
if (BossAlien.GetXPos() > 924)
{
BossAlienDirection = -1;
int BossXPos = 924 - BossInvaderImg.Width * 10;
if (BossAlien != null)
{
BossAlien.SetXPos(BossXPos);
}
BossXPos = BossXPos + BossInvaderImg.Width;
}
}
//Checks alien direction
if (LeftMostInvader != null)
{
if (LeftMostInvader.GetXPos() < 96)
{
AlienDirection = +1;
int XPos = 96;
for (int Count = 0; Count < 11; Count++) //Checks the array for the position of the aliens before moving them vertically once they reached the side
{
if (Invaders[Count] != null)
{
Invaders[Count].MoveVertical(20);
Invaders[Count].SetXPos(XPos);
}
//Second Array
if (InvadersOne[Count] != null)
{
InvadersOne[Count].MoveVertical(20);
InvadersOne[Count].SetXPos(XPos);
}
//Third Array
if (InvadersTwo[Count] != null)
{
InvadersTwo[Count].MoveVertical(20);
InvadersTwo[Count].SetXPos(XPos);
}
//Fourth Array
if (InvadersThree[Count] != null)
{
InvadersThree[Count].MoveVertical(20);
InvadersThree[Count].SetXPos(XPos);
}
//Fifth Array
if (InvadersFour[Count] != null)
{
InvadersFour[Count].MoveVertical(20);
InvadersFour[Count].SetXPos(XPos);
}
XPos = XPos + InvaderImg.Width;
}
}
}
if (RightMostInvader != null) //Does the same check with rightmost alien
{
if (RightMostInvader.GetXPos() > 924)
{
AlienDirection = -1;
int XPos = 924 - InvaderImg.Width * 10;
for (int Count = 0; Count < 11; Count++)
{
if (Invaders[Count] != null)
{
Invaders[Count].MoveVertical(20);
Invaders[Count].SetXPos(XPos);
}
//Second Array
if (InvadersOne[Count] != null)
{
InvadersOne[Count].MoveVertical(20);
InvadersOne[Count].SetXPos(XPos);
}
//Third Array
if (InvadersTwo[Count] != null)
{
InvadersTwo[Count].MoveVertical(20);
InvadersTwo[Count].SetXPos(XPos);
}
//Fourth Array
if (InvadersThree[Count] != null)
{
InvadersThree[Count].MoveVertical(20);
InvadersThree[Count].SetXPos(XPos);
}
//Fifth Array
if (InvadersFour[Count] != null)
{
InvadersFour[Count].MoveVertical(20);
InvadersFour[Count].SetXPos(XPos);
}
XPos = XPos + InvaderImg.Width;
}
}
}
Ticks = 0;
}
//Checks whether alien missile intersects with Player
//If intesects then Lose life or Game Over
//First array
if (AlienMissileFired != null)
{
Rectangle rectAlienMissile = new Rectangle((int)AlienMissileFired.GetPosition().X, (int)AlienMissileFired.GetPosition().Y, AlienMissileImg.Width, AlienMissileImg.Height);
Rectangle rectRocket = new Rectangle(RocketXPos, 700, RocketLauncherImg.Width, RocketLauncherImg.Height);
if (rectAlienMissile.Intersects(rectRocket))
{
if (AmountofLives == 0)
{
AlienMissileFired = null;
GameState = 4;
PlayerKilledSoundInstance.Play();
}
AmountofLives = AmountofLives - 1; //Player life is subtract from total life
AlienMissileFired = null; //When this reaches 0 then it switches over to Game Over screen
PlayerKilledSoundInstance.Play();
}
}
//Second array
if (AlienMissileFired2 != null)
{
Rectangle rectAlienMissile2 = new Rectangle((int)AlienMissileFired2.GetPosition().X, (int)AlienMissileFired2.GetPosition().Y, AlienMissileImg2.Width, AlienMissileImg2.Height);
Rectangle rectRocket = new Rectangle(RocketXPos, 700, RocketLauncherImg.Width, RocketLauncherImg.Height);
if (rectAlienMissile2.Intersects(rectRocket))
{
if (AmountofLives == 0)
{
AlienMissileFired2 = null;
GameState = 4;
PlayerKilledSoundInstance.Play();
}
AmountofLives = AmountofLives - 1;
AlienMissileFired2 = null;
PlayerKilledSoundInstance.Play();
}
}
//Third array
if (AlienMissileFired3 != null)
{
Rectangle rectAlienMissile3 = new Rectangle((int)AlienMissileFired3.GetPosition().X, (int)AlienMissileFired3.GetPosition().Y, AlienMissileImg2.Width, AlienMissileImg2.Height);
Rectangle rectRocket = new Rectangle(RocketXPos, 700, RocketLauncherImg.Width, RocketLauncherImg.Height);
if (rectAlienMissile3.Intersects(rectRocket))
{
if (AmountofLives == 0)
{
AlienMissileFired3 = null;
GameState = 4;
PlayerKilledSoundInstance.Play();
}
AmountofLives = AmountofLives - 1;
AlienMissileFired3 = null;
PlayerKilledSoundInstance.Play();
}
}
//Fourth array
if (AlienMissileFired4 != null)
{
Rectangle rectAlienMissile4 = new Rectangle((int)AlienMissileFired4.GetPosition().X, (int)AlienMissileFired4.GetPosition().Y, AlienMissileImg2.Width, AlienMissileImg2.Height);
Rectangle rectRocket = new Rectangle(RocketXPos, 700, RocketLauncherImg.Width, RocketLauncherImg.Height);
if (rectAlienMissile4.Intersects(rectRocket))
{
if (AmountofLives == 0)
{
AlienMissileFired4 = null;
GameState = 4;
PlayerKilledSoundInstance.Play();
}
AmountofLives = AmountofLives - 1;
AlienMissileFired4 = null;
PlayerKilledSoundInstance.Play();
}
}
//Boss Missile
if (BossMissileFired != null)
{
Rectangle rectBossMissile = new Rectangle((int)BossMissileFired.GetPosition().X, (int)BossMissileFired.GetPosition().Y, BossMissileImg.Width, BossMissileImg.Height);
Rectangle rectRocket = new Rectangle(RocketXPos, 700, RocketLauncherImg.Width, RocketLauncherImg.Height);
if (rectBossMissile.Intersects(rectRocket))
{
if (AmountofLives == 0)
{
BossMissileFired = null;
GameState = 4;
PlayerKilledSoundInstance.Play();
}
AmountofLives = AmountofLives - 1;
BossMissileFired = null;
PlayerKilledSoundInstance.Play();
}
}
//Controls missle being fired
//Checks whether missile intersects with Boss
if (MissileFired != null)
{
Rectangle rectMissile = new Rectangle((int)MissileFired.GetPosition().X, (int)MissileFired.GetPosition().Y, MissileImg.Width, MissileImg.Height);
//Creates a rectangle in order to compare whether the missile intercepts with alien
if (BossAlien != null)
{
Rectangle rectBossInvader = new Rectangle(BossAlien.GetXPos(), BossAlien.GetYPos(), BossInvaderImg.Width, BossInvaderImg.Height);
if (rectMissile.Intersects(rectBossInvader))
{
BossLife = BossLife - 1;
MissileFired = null;
PlayerScore = PlayerScore + 1000; //Killing boss gives more score
ExplosionSoundInstance.Play();
if (BossLife == 0)
{
BossAlien = null;
WeaponsCount = 1; //Also gives a power up (Weapon upgrade)
PlayerScore = PlayerScore + 1000;
BosskilledSoundInstance.Play();
ExplosionSoundInstance.Play();
}
}
}
}
// Checks whether the missle intersects with Alien
if (MissileFired != null)
{
Rectangle rectMissile = new Rectangle((int)MissileFired.GetPosition().X, (int)MissileFired.GetPosition().Y, MissileImg.Width, MissileImg.Height);
for (int Count = 0; Count < 11; Count++) //Rectangle is created to check whether both object intesect each other
{
if (Invaders[Count] != null) //If it does then the alien is declared as null (destroyed)
{
if (BossAlien == null)
{
rectMissile = new Rectangle((int)MissileFired.GetPosition().X, (int)MissileFired.GetPosition().Y, MissileImg2.Width, MissileImg2.Height);
}
Rectangle rectInvader = new Rectangle(Invaders[Count].GetXPos(), Invaders[Count].GetYPos(), InvaderImg.Width, InvaderImg.Height);
if (rectMissile.Intersects(rectInvader))
{
Invaders[Count] = null;
MissileFired = null;
PlayerScore = PlayerScore + 150;
ExplosionSoundInstance.Play();
InvaderkilledSoundInstance.Play();
break;
}
}
//Second Array
if (InvadersOne[Count] != null)
{
if (BossAlien == null)
{
rectMissile = new Rectangle((int)MissileFired.GetPosition().X, (int)MissileFired.GetPosition().Y, MissileImg2.Width, MissileImg2.Height);
}
Rectangle rectInvader = new Rectangle(InvadersOne[Count].GetXPos(), InvadersOne[Count].GetYPos(), InvaderImg.Width, InvaderImg.Height);
if (rectMissile.Intersects(rectInvader))
{
InvadersOne[Count] = null;
MissileFired = null;
PlayerScore = PlayerScore + 100;
ExplosionSoundInstance.Play();
InvaderkilledSoundInstance.Play();
break;
}
}
//Third Array
if (InvadersTwo[Count] != null)
{
if (BossAlien == null)
{
rectMissile = new Rectangle((int)MissileFired.GetPosition().X, (int)MissileFired.GetPosition().Y, MissileImg2.Width, MissileImg2.Height);
}
Rectangle rectInvader = new Rectangle(InvadersTwo[Count].GetXPos(), InvadersTwo[Count].GetYPos(), InvaderImg.Width, InvaderImg.Height);
if (rectMissile.Intersects(rectInvader))
{
InvadersTwo[Count] = null;
MissileFired = null;
PlayerScore = PlayerScore + 50;
ExplosionSoundInstance.Play();
InvaderkilledSoundInstance.Play();
break;
}
}
//Fourth Array
if (InvadersThree[Count] != null)
{
if (BossAlien == null)
{
rectMissile = new Rectangle((int)MissileFired.GetPosition().X, (int)MissileFired.GetPosition().Y, MissileImg2.Width, MissileImg2.Height);
}
Rectangle rectInvader = new Rectangle(InvadersThree[Count].GetXPos(), InvadersThree[Count].GetYPos(), InvaderImg.Width, InvaderImg.Height);
if (rectMissile.Intersects(rectInvader))
{
InvadersThree[Count] = null;
MissileFired = null;
PlayerScore = PlayerScore + 25;
ExplosionSoundInstance.Play();
InvaderkilledSoundInstance.Play();
break;
}
}
//Fifth Array
if (InvadersFour[Count] != null)
{
if (BossAlien == null)
{
rectMissile = new Rectangle((int)MissileFired.GetPosition().X, (int)MissileFired.GetPosition().Y, MissileImg2.Width, MissileImg2.Height);
}
Rectangle rectInvader = new Rectangle(InvadersFour[Count].GetXPos(), InvadersFour[Count].GetYPos(), InvaderImg.Width, InvaderImg.Height);
if (rectMissile.Intersects(rectInvader))
{
InvadersFour[Count] = null;
MissileFired = null;
PlayerScore = PlayerScore + 25;
ExplosionSoundInstance.Play();
InvaderkilledSoundInstance.Play();
break;
}
}
}
}
}
// Main Update
public void UpdatePlaying(GameTime currentTime)
{
//stop the theme song during the gameplay
ThemeSoundInstance.Stop();
// Allows the game to exit
if (GamePad.GetState(PlayerIndex.One).Buttons.Back == ButtonState.Pressed)
{
this.Exit();
}
// These statements check to see if there are any invaders remaining to shoot
bool IsInvaderRemaining = false;
for (int Count = 0; Count < 55; Count++)
{
if (Invaders[Count] != null)
{
IsInvaderRemaining = true;
break;
}
}
// If there are no invaders then move to end game state
if (!IsInvaderRemaining)
{
GameState = 4;
return;
}
//move missle if active
if (MissileFired != null)
{
MissileFired.Move();
}
//if space is pressed, initiate missile
if (Keyboard.GetState().IsKeyDown(Keys.Space))
{
//i found it irritating that pressing space would remove the existing missile
//now, a missile will only shoot if there is no existing missile
if (MissileFired == null)
{
//at location of rocket
MissileFired = new Missile(RocketXPos, 650);
//play shooting sound
ShootSoundInstance.Play();
}
}
//with the added code for pressing space,
//we need to kill the missile if it goes off the screen.
//otherwise if the missile misses an invader, it will continue forever you you will be unable to shoot another
//if there is a missile
if (MissileFired != null)
{
//above 1 Y co-ordinate
if (MissileFired.GetPosition().Y < 1)
{
//kill
MissileFired = null;
}
}
// Move the rocket left and right
if (Keyboard.GetState().IsKeyDown(Keys.Left))
{
RocketXPos = RocketXPos - 4;
}
if (Keyboard.GetState().IsKeyDown(Keys.Right))
{
RocketXPos = RocketXPos + 4;
}
//Keep the rocket on the screen
if (RocketXPos < 100)
{
RocketXPos = 100;
}
if (RocketXPos > 924)
{
RocketXPos = 924;
}
//Moving The Invaders
Ticks = Ticks + currentTime.ElapsedGameTime.TotalMilliseconds;
//variable for changing speed
int speedInt = 500;
//vairable for choosing invader
int invaderChoose = 0;
//find the first invader which isnt dead
do
{
invaderChoose = invaderChoose + 1;
}while (Invaders[invaderChoose] == null);
//assign speed depending on y position of selected invader
if (Invaders[invaderChoose].GetYPos() < 200)
{
speedInt = 500;
}
else if (Invaders[invaderChoose].GetYPos() > 200)
{
speedInt = 300;
}
else if (Invaders[invaderChoose].GetYPos() > 400)
{
speedInt = 100;
}
// move invaders
if (Ticks > speedInt)
{
//Play sound each time they move
InvaderSoundInstance.Play();
//setting initial speed and direction
for (int Count = 0; Count < 55; Count++)
{
if (Invaders[Count] != null)
{
Invaders[Count].MoveHorizontal(AlienSpeed * AlienDirection);
}
}
Invader LeftMostInvader = null;
Invader RightMostInvader = null;
for (int Count = 0; Count < 11; Count++)
{
if (Invaders[Count] != null)
{
LeftMostInvader = Invaders[Count];
break;
}
}
for (int Count = 10; Count > 0; Count--)
{
if (Invaders[Count] != null)
{
RightMostInvader = Invaders[Count];
break;
}
}
if (LeftMostInvader.GetXPos() < 96)
{
AlienDirection = +1;
int XPos = 96;
for (int Count = 0; Count < 11; Count++)
{
if (Invaders[Count] != null)
{
Invaders[Count].MoveVertical(8);
Invaders[Count].SetXPos(XPos);
}
XPos = XPos + InvaderImg.Width;
}
XPos = 96;
for (int Count = 11; Count < 22; Count++)
{
if (Invaders[Count] != null)
{
Invaders[Count].MoveVertical(8);
Invaders[Count].SetXPos(XPos);
}
XPos = XPos + InvaderImg.Width;
}
XPos = 96;
for (int Count = 22; Count < 33; Count++)
{
if (Invaders[Count] != null)
{
Invaders[Count].MoveVertical(8);
Invaders[Count].SetXPos(XPos);
}
XPos = XPos + InvaderImg.Width;
}
XPos = 96;
for (int Count = 33; Count < 44; Count++)
{
if (Invaders[Count] != null)
{
Invaders[Count].MoveVertical(8);
Invaders[Count].SetXPos(XPos);
}
XPos = XPos + InvaderImg.Width;
}
XPos = 96;
for (int Count = 44; Count < 55; Count++)
{
if (Invaders[Count] != null)
{
Invaders[Count].MoveVertical(8);
Invaders[Count].SetXPos(XPos);
}
XPos = XPos + InvaderImg.Width;
}
}
// Keeping launcher in constraints of invaders
if (RocketXPos < LeftMostInvader.GetXPos())
{
RocketXPos = LeftMostInvader.GetXPos();
}
if (RocketXPos > RightMostInvader.GetXPos())
{
RocketXPos = RightMostInvader.GetXPos();
}
// Moving Invaders left and right
if (RightMostInvader.GetXPos() > 924)
{
AlienDirection = -1;
int XPos = 924 - InvaderImg.Width * 11;
for (int Count = 0; Count < 11; Count++)
{
if (Invaders[Count] != null)
{
Invaders[Count].MoveVertical(8);
Invaders[Count].SetXPos(XPos);
}
XPos = XPos + InvaderImg.Width;
}
XPos = 924 - InvaderImg.Width * 11;
for (int Count = 11; Count < 22; Count++)
{
if (Invaders[Count] != null)
{
Invaders[Count].MoveVertical(8);
Invaders[Count].SetXPos(XPos);
}
XPos = XPos + InvaderImg.Width;
}
XPos = 924 - InvaderImg.Width * 11;
for (int Count = 22; Count < 33; Count++)
{
if (Invaders[Count] != null)
{
Invaders[Count].MoveVertical(8);
Invaders[Count].SetXPos(XPos);
}
XPos = XPos + InvaderImg.Width;
}
XPos = 924 - InvaderImg.Width * 11;
for (int Count = 33; Count < 44; Count++)
{
if (Invaders[Count] != null)
{
Invaders[Count].MoveVertical(8);
Invaders[Count].SetXPos(XPos);
}
XPos = XPos + InvaderImg.Width;
}
XPos = 924 - InvaderImg.Width * 11;
for (int Count = 44; Count < 55; Count++)
{
if (Invaders[Count] != null)
{
Invaders[Count].MoveVertical(8);
Invaders[Count].SetXPos(XPos);
}
XPos = XPos + InvaderImg.Width;
}
}
//Resetting millisecond count for moving invaders.
Ticks = 0;
}
// UFO
//Generate Random Value Between 1 and 500
int ReturnValue = RandomNumber(1, 500);
//If There is no active UFO and The Random Number Is 1, Then Set ufoalive To True
if (ufo.ufoAlive == false && ReturnValue == 1)
{
ufo.ufoAlive = true;
}
//Count milliseconds
ufoTime = ufoTime + currentTime.ElapsedGameTime.TotalMilliseconds;
// If Ufoalive is true, i.e. there is an active ufo, increment X position by 10 pixels every 100 milliseconds
// then reset ufotime variable to zero
if (ufo.ufoAlive == true)
{
if (ufoTime > 100)
{
ufo.UFOxPos = ufo.UFOxPos + 10;
ufoTime = 0;
}
}
// if ufo position goes further than 1000 pixels, set ufoalive to false, i.e. kill the ufo. so a new one can be generated.
if (ufo.UFOxPos > 1000)
{
ufo.ufoAlive = false;
ufo.UFOxPos = 10;
}
// if a missile is fired
if (MissileFired != null)
{
//rectangle for missile
Rectangle rectMissile = new Rectangle((int)MissileFired.GetPosition().X, (int)MissileFired.GetPosition().Y, MissileImg.Width, MissileImg.Height);
//for each invader
for (int Count = 0; Count < 55; Count++)
{
if (Invaders[Count] != null)
{
Rectangle rectInvader = new Rectangle(Invaders[Count].GetXPos(), Invaders[Count].GetYPos(), InvaderImg.Width, InvaderImg.Height);
//Check for invader collision with the missile
if (rectMissile.Intersects(rectInvader))
{
//set invader and missile to null
Invaders[Count] = null;
MissileFired = null;
//increase score and play collision sound
PlayerScore = PlayerScore + 100;
CollisionSoundInstance.Play();
break;
}
}
}
//checking for collison with ufo
Rectangle rectUfo = new Rectangle(ufo.UFOxPos, 10, UFOimg.Width, UFOimg.Height);
if (rectMissile.Intersects(rectUfo))
{
//add score, jump UFO to end position, Play Collision Sound
PlayerScore = PlayerScore + 1000;
ufo.UFOxPos = 1000;
CollisionSoundInstance.Play();
}
}
//check for collision between invader and rocker launcher
for (int Count2 = 0; Count2 < 55; Count2++)
{
if (Invaders[Count2] != null)
{
Rectangle rectInvader2 = new Rectangle(Invaders[Count2].GetXPos(), Invaders[Count2].GetYPos(), InvaderImg.Width, InvaderImg.Height);
Rectangle rectRocket = new Rectangle(RocketXPos, 650, RocketLauncherImg.Width, RocketLauncherImg.Height);
if (rectInvader2.Intersects(rectRocket))
{
//if collision occurs, remove a life
GameLives = GameLives - 1;
}
}
}
//Makeing the invaders fire back
//using a new missile class which goes the opposite direction to the existing missile class
// i felt it was easier to seperate the two classes completely than create another instance of the existing missile class and creating a reverse move.
//if an invader isnt currently firing
if (invaderMissile == null)
{
//generate random number for possibility of fire
int RandomInvaderMissileFired = RandomNumber(1, 500);
//if random number is equal to 1, fire a missle
if (RandomInvaderMissileFired == 1)
{
//generate second random number for choosing which invader
int ChooseInvader = RandomNumber(1, 55);
//if the invader is not dead
if (Invaders[ChooseInvader] != null)
{
//create new missile
invaderMissile = new Missile(Invaders[ChooseInvader].GetXPos(), Invaders[ChooseInvader].GetYPos());
}
}
}
//if missile is existant
if (invaderMissile != null)
{
//check for collisions
Rectangle rectRocket = new Rectangle(RocketXPos, 650, RocketLauncherImg.Width, RocketLauncherImg.Height);
Rectangle rectInvaderMissile = new Rectangle((int)invaderMissile.GetPosition().X, (int)invaderMissile.GetPosition().Y, MissileImg.Width, MissileImg.Height);
if (rectInvaderMissile.Intersects(rectRocket))
{
//if collision, remove life
GameLives = GameLives - 1;
invaderMissile = null;
}
//kill if no longer visible
else if (invaderMissile.GetPosition().Y > 700)
{
invaderMissile = null;
}
// else move the missile
else
{
invaderMissile.MoveReverse();
}
}
//check remaining lives
if (GameLives < 0)
{
//end game to end screen if none left
GameState = 3;
return;
}
}
//Initialise Ingame Variables
public void InitialiseGameVariables()
{
RocketXPos = 650; //Set Rocket X value
AlienDirection = -1; //Set default direction
AlienSpeed = 25; //Sets a default speed (These can be changed in-game to increase difficulty)
BossAlienDirection = -1;
BossAlienSpeed = 100;
//Declaring the Alien arrays:
Invaders = new Invader[11]; //11 columns across
InvadersOne = new Invader[11];
InvadersTwo = new Invader[11];
InvadersThree = new Invader[11];
InvadersFour = new Invader[11];
int XPos = 512; // Sets the default X coordinate for Aliens
for (int Count = 0; Count < 11; Count++) //Checks the count for amount of aliens
{
//First Array
Invaders[Count] = new Invader();
Invaders[Count].SetXPos(XPos);
Invaders[Count].SetYPos(100); //Each line of alien has a different Y coordinate
//Second Array
InvadersOne[Count] = new Invader();
InvadersOne[Count].SetXPos(XPos);
InvadersOne[Count].SetYPos(135);
//Third Array
InvadersTwo[Count] = new Invader();
InvadersTwo[Count].SetXPos(XPos);
InvadersTwo[Count].SetYPos(155);
//Fourth Array
InvadersThree[Count] = new Invader();
InvadersThree[Count].SetXPos(XPos);
InvadersThree[Count].SetYPos(180);
//Fifth Array
InvadersFour[Count] = new Invader();
InvadersFour[Count].SetXPos(XPos);
InvadersFour[Count].SetYPos(205);
XPos = XPos + 32;
}
int BossXPos = 512; //Sets defualt X position for Boss Alien
BossAlien= new BossAlien();
BossAlien.SetXPos(BossXPos);
BossAlien.SetYPos(0);
Ticks = 0; //Shows the amount of time passed
Timer = 0; //Timer for each variable e.g. Alien & Boss
Timer2 = 0;
Timer3 = 0;
Timer4 = 0;
MissileFired = null; //Missile values are set to null at start
AlienMissileFired = null;
AlienMissileFired2 = null;
BossMissileFired = null;
PlayerScore = 0; //Player score set to 0 at start
AmountofLives = 3; //Amount of lives the player at start of game
BossLife = 3; //Amount of lives Boss has at start of game
WeaponsCount = 1; //Checks what weapon the player is using & allows switching between them
}
protected void InitialiseGameVariables()
{
//initialise variables.
GameLives = 3;
RocketXPos = 512;
AlienDirection = -1;
AlienSpeed = 16;
Invaders = new Invader[55];
int XPos = 512;
int posY = 100;
int posX = 512;
//Generating the invaders. 5 blocks of code for each row
for (int Count = 0; Count < 11; Count++)
{
Invaders[Count] = new Invader();
Invaders[Count].SetXPos(posX);
Invaders[Count].SetYPos(posY);
posX = posX + 32;
XPos = XPos + 32;
}
//Resetting the X position
posX = 512;
for (int Count = 11; Count < 22; Count++)
{
posY = 150;
Invaders[Count] = new Invader();
Invaders[Count].SetXPos(posX);
Invaders[Count].SetYPos(posY);
posX = posX + 32;
XPos = XPos + 32;
}
posX = 512;
for (int Count = 22; Count < 33; Count++)
{
posY = 200;
Invaders[Count] = new Invader();
Invaders[Count].SetXPos(posX);
Invaders[Count].SetYPos(posY);
posX = posX + 32;
XPos = XPos + 32;
}
posX = 512;
for (int Count = 33; Count < 44; Count++)
{
posY = 250;
Invaders[Count] = new Invader();
Invaders[Count].SetXPos(posX);
Invaders[Count].SetYPos(posY);
posX = posX + 32;
XPos = XPos + 32;
}
posX = 512;
for (int Count = 44; Count < 55; Count++)
{
posY = 300;
Invaders[Count] = new Invader();
Invaders[Count].SetXPos(posX);
Invaders[Count].SetYPos(posY);
posX = posX + 32;
XPos = XPos + 32;
}
//Setting More Game Variables & Instances
Ticks = 0;
MissileFired = null;
PlayerScore = 0;
ufo = new UFO();
base.Initialize();
invaderMissile = null;
}