/// <summary>
/// Performs an Attack for the specified Entity. The Entity's
/// attack Type is evaluated and the appropriate attack is performed.
/// </summary>
/// <param name="entID">The Attacking Entity.</param>
/// <typeparam name="T">The Team the Entity belongs to.</typeparam>
protected void Attack <T>(ulong entID) where T : CTeam
{
CAI AI = World.GetComponent <CAI>(entID);
CDamage damage;
CPosition pos;
CPosition targetPos;
/// <summary>
/// The AI has just attacked, so its cooldown is started.
/// </summary>
AI.LastAttackTime = World.GameTime;
AI.AttackIsReady = false;
/// <summary>
/// If the Attack Type is Melee, register an attack with the Damage System.
/// If the Attack Type is Gun, create an Arrow Entity to travel towards the Target.
/// </summary>
switch (AI.AttackType)
{
case AttackType.Melee:
{
/// <summary>
/// The System where Attacks are registered.
/// </summary>
DamageSystem damageSystem = World.GetSystem <DamageSystem>();
damage = World.GetComponent <CDamage>(entID);
damageSystem.RegisterAttack(AI.TargetID, damage.Damage);
break;
}
case AttackType.Bow:
{
pos = World.GetComponent <CPosition>(entID);
CBow bow = World.GetComponent <CBow>(entID);
targetPos = World.GetComponent <CPosition>(AI.TargetID);
EntityFactory.CreateArrow <T>(pos.Centre.X, pos.Centre.Y, bow, targetPos);
break;
}
}
}
/// <summary>
/// Creates an Entity with all Components of an Arrow and adds it to the World.
/// This Entity represents the Arrows used by Archers of both teams.
/// </summary>
/// <param name="x">The x coordinate where the Entity will be created.</param>
/// <param name="y">The y coordinate where the Entity will be created.</param>
/// <param name="bow">The bow determining speed and damage of the Arrow.</param>
/// <param name="targetPos">The position of the Entity the Arrow is heading towards.</param>
/// <typeparam name="T">The team the Arrow belongs to</typeparam>
public static void CreateArrow <T>(float x, float y, CBow bow, CPosition targetPos) where T : CTeam
{
//Create Entity and add to world
ulong newEntity = _world.NextEntityID;
//Create components and pass to world to send to Systems
List <Component> components = new List <Component>();
components.Add(new CPosition(x, y, ARROW_SIZE));
components.Add(new CDamage(bow.ArrowDamage));
components.Add(new CCollidable());
components.Add(new CProjectile());
components.Add(new CDamagesOnImpact(true));
//Calculate the centre of the passed in position to be the Arrow's target.
float targetCentreX = targetPos.X + (targetPos.Width / 2);
float targetCentreY = targetPos.Y + (targetPos.Height / 2);
//Calculate appropriate velocities for Arrow to reach target.
Vector velocity = Utils.GetVectorBetweenPoints(x, y, targetCentreX, targetCentreY, bow.ArrowSpeed);
components.Add(new CVelocity(velocity.X, velocity.Y, bow.ArrowSpeed));
if (typeof(T) == typeof(CPlayerTeam))
{
components.Add(new CPlayerTeam());
components.Add(new CRenderable(SwinGame.BitmapNamed("PlayerArrow")));
}
else if (typeof(T) == typeof(CEnemyTeam))
{
components.Add(new CEnemyTeam());
components.Add(new CRenderable(SwinGame.BitmapNamed("Arrow")));
}
_world.AddEntity(newEntity, components);
}
