/// <summary>
/// Calls Update on the Base and all the Minions.
/// Calculates collisions.
/// Sets minion path waypoints.
/// Removes inactive minions.
/// Spawns new minion waves.
/// </summary>
/// <param name="gameTime">Game timing state.</param>
/// <param name="enemyMinions">A list of minions to check collisions with.</param>
public void Update(GameTime gameTime, List<Minion> enemyMinions, Base enemyBase)
{
//Update the base
Base.Update(gameTime);
//Update minions
for (int i = Minions.Count - 1; i >= 0; i--)
{
Minions[i].Update(gameTime);
//Perform collision detection with enemy minions
bool inRange = Minions[i].CheckCollision(enemyMinions);
//Reset the minion's goal if no enemies are in range, or if it's traveling backwards
//Minions can only travel towards the enemy's base
if (inRange == false
|| Math.Sign(Minions[i].Direction.X) != Math.Sign(Destination.X - Minions[i].Center.X))
{
//No enemies are in range
//Check how far the minion has traveled from their base
if (Math.Abs(Base.Center.X - Minions[i].Center.X) < (ScreenWidth / 2 - Base.Size / 2))
{
//Still head towards waypoint
Minions[i].SetGoal(Minions[i].Waypoint);
}
else
{
//Head towards the final destination now (the enemy base)
Minions[i].SetGoal(Minions[i].Destination);
}
}
//Check collision with enemy base
float distance = (float)Math.Sqrt(
Math.Pow(Minions[i].Center.X - enemyBase.Center.X, 2)
+ Math.Pow(Minions[i].Center.Y - enemyBase.Center.Y, 2)
);
if (distance < (enemyBase.Size / 2))
{
Minions[i].Active = false;
enemyBase.Health -= Minions[i].Health;
}
//Add each minion's money earned to the player's money
if (Minions[i].MoneyEarned > 0)
{
Money += Minions[i].MoneyEarned;
Minions[i].MoneyEarned = 0;
}
//Deactivate minions off the screen
if (Minions[i].Position.X > ScreenWidth
|| Minions[i].Position.X < -Minions[i].Size
|| Minions[i].Position.Y > ScreenHeight
|| Minions[i].Position.Y < -Minions[i].Size)
{
Minions[i].Active = false;
}
//Remove inactive minions
if (Minions[i].Active == false)
{
Minions.RemoveAt(i);
}
}
//Check if respawn counter is up
if (gameTime.TotalGameTime - PreviousSpawnTime > MinionSpawnTime)
{
PreviousSpawnTime = gameTime.TotalGameTime;
SpawnWaves = 5;
}
//If respawn queue is not empty, spawn a wave
if (SpawnWaves > 0)
{
SpawnMinionWave();
SpawnWaves--;
}
}
/// <summary>
/// Initializes player properties and sets the boundary on the player's game entities.
/// </summary>
/// <param name="minionTexture">The texture used for drawing minions.</param>
/// <param name="teamColor">The player's team color.</param>
/// <param name="screenWidth">Width of the playable game area.</param>
/// <param name="screenHeight">Height of the playable game area.</param>
public void Initialize(Texture2D minionTexture, Color teamColor, int screenWidth, int screenHeight)
{
Money = 100;
MinionHealth = 5;
MinionSpeed = 0.5f;
MinionTexture = minionTexture;
TeamColor = teamColor;
MinionSpawnTime = TimeSpan.FromSeconds(8f);
PreviousSpawnTime = TimeSpan.Zero;
SpawnWaves = 0;
ScreenWidth = screenWidth;
ScreenHeight = screenHeight;
Base = new Base();
Minions = new List<Minion>();
Waypoints = new List<Vector2>();
}
