/// <summary>
/// Enables self-updating of the building
/// </summary>
/// <param name="gameTime">Snapshot of time.</param>
public override void Update(GameTime gameTime)
{
if (scene.Fighters.Count <= scene.MaxNumberOfFighters)
{
HealthPoints += 0.01f;
if (HealthPoints >= 1)
{
Fighter f = null;
do
{
if (f != null)
{
f.Destroy();
}
Vector3 randomPosition = new Vector3(Position.X + (float)WarGame.RandomGenerator.NextDouble() * 40.0f - 20.0f,
scene.GroundYAxisPosition + 1.0f,
Position.Z + (float)WarGame.RandomGenerator.NextDouble() * 40.0f - 20.0f);
f = new Fighter((WarGame)base.Game, randomPosition, scene);
} while (f.CheckForCollisions() != null);
HealthPoints = 0.0f;
((WarGame)base.Game).Sound.BoooiiinnngSoundInstance.Play();
scene.SceneComponents.Add(f);
scene.SceneObjects.Add(f);
scene.Fighters.Add(f);
}
}
base.Update(gameTime);
}
/// <summary>
/// Constructor of the bullet
/// </summary>
/// <param name="_owner">Fighter which shoots the bullet</param>
/// <param name="_game">Game in which the bullet exists</param>
public Bullet(Fighter _owner, Game _game, MainScene _scene)
: base(_game)
{
scene = _scene;
owner = _owner;
position = _owner.Position;
headVector = Vector3.Normalize(_owner.TargetToAttack.Position - position);
velocity = headVector * owner.MaxSpeed * 2;
secondPoint = position + headVector * length;
color = new Color(new Vector3((float)WarGame.RandomGenerator.NextDouble(),
(float)WarGame.RandomGenerator.NextDouble(),
(float)WarGame.RandomGenerator.NextDouble()));
DrawOrder = (int)WarGame.DrawingOrder.GameObject;
scene.SceneComponents.Add(this);
lifeTime = new TimeSpan();
}
/// <summary>
/// Atack steering behavior
/// </summary>
/// <param name="caller">Game object which calles atack SB</param>
/// <param name="target">Target of the attack</param>
/// <returns>Force acting on caller</returns>
public static Vector3 Attack(Fighter caller, AlienCraft target, List<Fighter> friends)
{
float minimalDistanceToTargetSquared = 5.0f * 5.0f;
float shootingDistanceSquared = 15.0f * 15.0f;
float maximalDistaneToTargetSquared = 30.0f * 30.0f;
// if you're not escaping
if (!caller.IsEscaping)
{
Vector3 seekingForce = SeekWithSeparation(caller, target.Position, friends);
Vector3 separationForce = Vector3.Zero;
// if you're to close start escaping
if (Vector3.DistanceSquared(caller.Position, target.Position) < minimalDistanceToTargetSquared)
{
caller.IsEscaping = true;
}
// if you're in the shooting range slow down to minimum
if (Vector3.DistanceSquared(caller.Position, target.Position) < shootingDistanceSquared)
{
caller.Velocity = Vector3.Zero;
}
return seekingForce + separationForce;
}
// if you're escaping
else
{
// if you're far enough start shooting once again
if (Vector3.DistanceSquared(caller.Position, target.Position) > maximalDistaneToTargetSquared)
{
caller.IsEscaping = false;
}
return Flee(caller, target.Position);
}
}
/// <summary>
/// Seek steering behavior combined with the separation
/// </summary>
/// <param name="caller">Game object which calls this SB</param>
/// <param name="target">Target seeked by the caller</param>
/// <param name="objects">List of fighters to separate from</param>
/// <returns>Force acting at the caller</returns>
public static Vector3 SeekWithSeparation(Fighter caller, Vector3 target, List<Fighter> objects)
{
if ((caller.Position - target).Length() > 5)
return Seek(caller, target) + 2 * Separation(caller, objects);
else if (Separation(caller, objects).Length() < 0.1f)
return Vector3.Zero;
else
return Seek(caller, target) + 6 * Separation(caller, objects);
}
