C++ (Cpp) UWorld::OverlapMultiByChannel Examples

Example #1

File: ablTargetingBox.cpp Project: zpzsoft/zpzsoft.github.io

void UAblTargetingBox::FindTargets(UAblAbilityContext& Context) const
{
	AActor* SourceActor = m_Location.GetSourceActor(Context);
	check(SourceActor);
	UWorld* World = SourceActor->GetWorld();
	FTransform QueryTransform;

	if (IsUsingAsync() && UAbleSettings::IsAsyncEnabled())
	{
		// Check if we have a valid Async handle already. 
		if (!Context.HasValidAsyncHandle())
		{
			FCollisionShape BoxShape = FCollisionShape::MakeBox(m_HalfExtents);

			m_Location.GetTransform(Context, QueryTransform);

			// Push our query out by our half extents so we aren't centered in the box.
			FQuat Rotation = QueryTransform.GetRotation();

			FVector HalfExtentsOffset = Rotation.GetForwardVector() * m_HalfExtents.X;

			QueryTransform *= FTransform(HalfExtentsOffset);

			FTraceHandle AsyncHandle = World->AsyncOverlapByChannel(QueryTransform.GetLocation(), QueryTransform.GetRotation(), GetCollisionChannel(), BoxShape);
			Context.SetAsyncHandle(AsyncHandle);
		}
		else // Poll and see if our query is done, if so - process it.
		{
			FOverlapDatum Datum;
			if (World->QueryOverlapData(Context.GetAsyncHandle(), Datum))
			{
				ProcessResults(Context, Datum.OutOverlaps);

				FTraceHandle Empty;
				Context.SetAsyncHandle(Empty); // Reset our handle.
			}

			return;
		}
	}
	else // Normal Sync Query
	{
		FCollisionShape BoxShape = FCollisionShape::MakeBox(m_HalfExtents);

		m_Location.GetTransform(Context, QueryTransform);

		// Push our query out by our half extents so we aren't centered in the box.
		FQuat Rotation = QueryTransform.GetRotation();

		FVector HalfExtentsOffset = Rotation.GetForwardVector() * m_HalfExtents.X;

		QueryTransform *= FTransform(HalfExtentsOffset);

		TArray<FOverlapResult> Results;
		if (World->OverlapMultiByChannel(Results, QueryTransform.GetLocation(), QueryTransform.GetRotation(), GetCollisionChannel(), BoxShape))
		{
			ProcessResults(Context, Results);
		}
	}

#if !UE_BUILD_SHIPPING
	if (FAblAbilityDebug::ShouldDrawQueries())
	{
		// Nope, go ahead and fire off our Async query.
		FVector AlignedBox = GetAlignedBox(Context, QueryTransform);

		FAblAbilityDebug::DrawBoxQuery(World, QueryTransform, AlignedBox);
	}
#endif // UE_BUILD_SHIPPING
}