/// <summary>
/// Evaluates the state of each Explosion Man. Two key events occur with Explosion Men:
/// -When the Spawn Animation finishes, the explosion is created.
/// -When the Explosion Animation finishes, the Entity is removed.
/// This System checks the state and animation of each Explosion Man.
/// </summary>
public override void Process()
{
CExplosionMan explosion;
CAnimation anim;
CPosition pos;
for (int i = Entities.Count - 1; i >= 0; i--)
{
anim = World.GetComponent <CAnimation>(Entities[i]);
/// <summary>
/// If one of the two key events are happening.
/// </summary>
if (SwinGame.AnimationEnded(anim.Anim))
{
explosion = World.GetComponent <CExplosionMan>(Entities[i]);
/// <summary>
/// If not ready to explode, the Spawn animation has just finished.
/// Therefore, create the explosion.
/// </summary>
if (!explosion.ReadyToExplode)
{
explosion.ReadyToExplode = true;
pos = World.GetComponent <CPosition>(Entities[i]);
/// <summary>
/// Update size details as the Entity is now an Explosion.
/// </summary>
pos.Width = EntityFactory.EXPLOSION_SIZE;
pos.Height = EntityFactory.EXPLOSION_SIZE;
/// <summary>
/// Adjust position details so explosion is in centre of the cell.
/// </summary>
CollisionCheckSystem collisions = World.GetSystem <CollisionCheckSystem>();
Point2D cellPos = collisions.CentreOfCell(explosion.TargetCell);
pos.X = cellPos.X - (pos.Width / 2);
pos.Y = cellPos.Y - (pos.Height / 2);
/// <summary>
/// Create explosion animation.
/// </summary>
anim.Img = SwinGame.BitmapNamed("Explosion");
SwinGame.AssignAnimation(anim.Anim, "Explode", anim.AnimScript);
/// <summary>
/// Add new components to the Entity.
/// </summary>
World.AddComponent(Entities[i], new CDamagesOnImpact(false));
World.AddComponent(Entities[i], new CDamage(EntityFactory.EXPLOSION_DAMAGE));
World.AddComponent(Entities[i], new CCollidable());
}
else //If ready to explode, the Explode animation has just finished. Therefore, remove the Entity.
{
World.RemoveEntity(Entities[i]);
}
}
}
}
/// <summary>
/// Creates an Entity with all Components for an Explosion Man and adds it to the World.
/// This Entity represents the exploding wizard the Player can purchase.
/// </summary>
public static void CreateExplosionMan()
{
//Create Entity and add to world
ulong newEntity = _world.NextEntityID;
/// <summary>
/// Identifies the most populated Enemy Spatial Hash Cell. The Explosion man
/// will be spawned at the centre of this cell.
/// </summary>
CollisionCheckSystem collChkSys = World.GetSystem <CollisionCheckSystem>();
int mostPopulatedCell = collChkSys.EnemyCells.Aggregate((l, r) => l.Value.Count > r.Value.Count ? l : r).Key;
Point2D pos = collChkSys.CentreOfCell(mostPopulatedCell);
/// <summary>
/// Adjust position for Sprite size so Explosion Man spawns at centre.
/// </summary>
float atX = pos.X - (EXPLOSION_MAN_SIZE / 2);
float atY = pos.Y - (EXPLOSION_MAN_SIZE / 2);
/// <summary>
/// Animation details for Animation component.
/// </summary>
Bitmap bmp = SwinGame.BitmapNamed("ExplosionMan");
Animation anim = SwinGame.CreateAnimation("Spawn", SwinGame.AnimationScriptNamed("ExplosionAnim"));
AnimationScript animScript = SwinGame.AnimationScriptNamed("ExplosionAnim");
//Create components and pass to world to send to Systems
List <Component> components = new List <Component>();
components.Add(new CPlayerTeam());
components.Add(new CPosition(atX, atY, EXPLOSION_MAN_SIZE));
components.Add(new CAnimation(bmp, anim, animScript));
components.Add(new CExplosionMan(mostPopulatedCell));
_world.AddEntity(newEntity, components);
}