// Returns the strongest barrier at that location
private ExplosionBarrier GetBarrierAtLocation(Point point)
{
ExplosionBarrier strongestBarrier = ExplosionBarrier.None;
entityGrid.QueryUniqueIdsAt(point.X, point.Y, barrierQueryList);
foreach (int uniqueId in barrierQueryList)
{
Entity there = EntityManager.TryGetEntityByUniqueId(uniqueId);
if (there != null)
{
ExplosionImpact explosionImpact = (ExplosionImpact)EntityManager.GetComponent(there, ComponentTypeIds.ExplosionImpact);
if (explosionImpact != null)
{
strongestBarrier = (ExplosionBarrier)Math.Max((int)explosionImpact.Barrier, (int)strongestBarrier);
}
}
}
return(strongestBarrier);
}
protected override void OnProcessEntities(GameTime gameTime, IEnumerable <int> entityIdCollection)
{
// We could use the physics system to handle grabbing powerups, but it is fairly straightforward to just do it here with our grid.
foreach (int liveId in entityIdCollection)
{
Placement placement = placementComponents.GetComponentFor(liveId);
entityGrid.QueryUniqueIdsAt(placement.Position.ToInteger(), uniqueIdWorker);
foreach (int uniqueIdOverlap in uniqueIdWorker)
{
Entity possiblePlayerEntity = EntityManager.GetEntityByUniqueId(uniqueIdOverlap);
PlayerInfo player = (PlayerInfo)EntityManager.GetComponent(possiblePlayerEntity, ComponentTypeIds.Player);
if (player != null)
{
// A player will pick this up!
PickUpPowerUp(possiblePlayerEntity.LiveId, player, powerUpComponents.GetComponentFor(liveId));
// Delete this powerup.
EntityManager.DelayFreeByLiveId(liveId, EntityFreeOptions.Deep);
break;
}
}
}
}
protected override int OnHandleMessage(Entity target, uint message, ref MessageData data, object sender)
{
switch (message)
{
// This returns the unique id of the first entity at a particular spot that contains a particular component.
case Messages.QueryComponentAtGrid:
int uniqueIdFound = EntityManager.InvalidEntityUniqueId;
entityGrid.QueryUniqueIdsAt(data.Int32, data.Int32Alt, uniqueIdWorker);
foreach (int uniqueIdConsider in uniqueIdWorker)
{
if (EntityManager.GetComponent(EntityManager.GetEntityByUniqueId(uniqueIdConsider), data.Int32AltAlt) != null)
{
uniqueIdFound = uniqueIdConsider;
break;
}
}
data.SetIntResponse(uniqueIdFound);
data.Handled = true;
break;
}
return(0);
}
private void MaybeSendDeathBlock(GameState gameState)
{
// How many spots for death blocks?
int count = (gameState.Bounds.Width - 2) * (gameState.Bounds.Height - 2);
// How many seconds before they start appearing?
float secondsToAppear = GameConstants.DeathBlocksArrivePeriod * count;
Rectangle bounds = gameState.Bounds;
float timeAppearing = Math.Max(0, secondsToAppear - gameState.TimeRemaining);
int numberAppearing = (int)(timeAppearing / GameConstants.DeathBlocksArrivePeriod);
Debug.Assert(numberAppearing <= count);
// Show a warning?
timeRunningOut = ((numberAppearing == 0) && (secondsToAppear < GameConstants.TimeRunningOutWarningTime));
while (numberAppearing > gameState.DeathBlockCount)
{
// Send a block.
Entity deathBlock = EntityManager.AllocateForGeneratedContent("DeathBlock", Universe.TopLevelGroupUniqueIdBase);
// Figure out where! That's the hard part.
Point position = deathBlockSpiralPoints[gameState.DeathBlockCount];
Placement placement = (Placement)EntityManager.GetComponent(deathBlock, ComponentTypeIds.Placement);
placement.Position = new Vector3(position.X, position.Y, 0);
EntityManager.SendMessage(deathBlock, Messages.PlaySound, "Thud".CRC32Hash(), GameConstants.ThudVolume, null);
// Send a kill messages to any entity here.
entityGrid.QueryUniqueIdsAt(position, uniqueIdWorker);
foreach (int uniqueIdHere in uniqueIdWorker)
{
EntityManager.SendMessage(EntityManager.GetEntityByUniqueId(uniqueIdHere), Messages.DirectKill, null);
}
gameState.DeathBlockCount++;
}
}
