public void UpdatePlaying(GameTime currentTime) // Main gameplay
{
Ticks = Ticks + currentTime.ElapsedGameTime.TotalMilliseconds;
// Invader movement
if (Ticks > 500)
{
// Invader sideways movement
for (int rows = 0; rows < 5; rows++)
{
for (int cols = 0; cols < 11; cols++)
{
if (InvaderDir.Equals("Right"))
{
InvaderArray[rows, cols].X = InvaderArray[rows, cols].X + InvaderSpd;
}
if (InvaderDir.Equals("Left"))
{
InvaderArray[rows, cols].X = InvaderArray[rows, cols].X - InvaderSpd;
}
}
}
// Invader Limits
string ChangeDir = "No";
for (int rows = 0; rows < 5; rows++)
{
for (int cols = 0; cols < 11; cols++)
{
if (InvaderLiving[rows, cols].Equals("Yes"))
{
if (InvaderArray[rows, cols].X + InvaderArray[rows, cols].Width > 870)
{
InvaderDir = "Left";
ChangeDir = "Yes";
}
if (InvaderArray[rows, cols].X < 30)
{
InvaderDir = "Right";
ChangeDir = "Yes";
}
}
}
}
// Invader downward movement
if (ChangeDir.Equals("Yes"))
{
for (int rows = 0; rows < 5; rows++)
{
for (int cols = 0; cols < 11; cols++)
{
InvaderArray[rows, cols].Y = InvaderArray[rows, cols].Y + 8;
}
}
}
Ticks = 0;
}
// Gunship control
if (Keyboard.GetState().IsKeyDown(Keys.Right))
{
ShipXPos = ShipXPos + 3;
}
if (Keyboard.GetState().IsKeyDown(Keys.Left))
{
ShipXPos = ShipXPos - 3;
}
//Gunship limits
if (ShipXPos < 15)
{
ShipXPos = 15;
}
if (ShipXPos > 780)
{
ShipXPos = 780;
}
// Firing missile
if (ShotsFired != null) // Moves missile when it is visible
{
ShotsFired.Move();
}
if (Keyboard.GetState().IsKeyDown(Keys.Space) & ShotsFired == null) // Fires missile when space is pressed
{
ShotsFired = new Missile(ShipXPos + 45, 565);
}
if (ShotsFired != null) // Deletes the missile when it passes the top of the screen
{
if (ShotsFired.GetMissilePos().Y < 0)
{
ShotsFired = null;
}
}
// Missile/invader collision detection
if (ShotsFired != null)
{
MissileHitbox = new Rectangle((int)ShotsFired.GetMissilePos().X, (int)ShotsFired.GetMissilePos().Y,
Missile.Width, Missile.Height);
for (int rows = 0; rows < 5; rows++)
{
for (int cols = 0; cols < 11; cols++)
{
if (InvaderLiving[rows, cols].Equals("Yes"))
{
if (MissileHitbox.Intersects(InvaderArray[rows, cols]))
{
ShotsFired = null;
InvaderLiving[rows, cols] = "No";
Score = Score + 50;
}
}
}
}
}
// Gunship/Invader collision detection
ShipHitbox = new Rectangle(ShipXPos, 565, Gunship.Width, Gunship.Height);
for (int rows = 0; rows < 5; rows++)
{
for (int cols = 0; cols < 11; cols++)
{
if (InvaderLiving[rows, cols].Equals("Yes"))
{
if (InvaderArray[rows, cols].Y + InvaderArray[rows, cols].Height > ShipHitbox.Y)
{
GameState = 3;
}
}
}
}
// Speeds up invaders when they reach a certain point
for (int rows = 0; rows < 5; rows++)
{
for (int cols = 0; cols < 11; cols++)
{
if (InvaderLiving[rows, cols].Equals("Yes"))
{
if (InvaderArray[rows, cols].Y > 350)
{
InvaderSpd = 30;
}
}
}
}
int Count = 0;
for (int rows = 0; rows < 5; rows++)
{
for (int cols = 0; cols < 11; cols++)
{
if (InvaderLiving[rows, cols].Equals("Yes"))
{
Count = Count + 1;
}
}
}
// Finishes when all invaders killed
if (Count == 0)
{
this.Exit();
}
}