Build a Health Bar

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What You Will Build

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Step 1: Configure the Settings

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 1// Declare delegates for event-driven communication
 2DECLARE_DYNAMIC_MULTICAST_DELEGATE_OneParam(FOnStateChanged, EMyState, NewState);
 3DECLARE_DYNAMIC_MULTICAST_DELEGATE_TwoParams(FOnProgressUpdated, float, Progress, FString, Message);
 4
 5UPROPERTY(BlueprintAssignable, Category = "Events")
 6FOnStateChanged OnStateChanged;
 7
 8UPROPERTY(BlueprintAssignable, Category = "Events")
 9FOnProgressUpdated OnProgressUpdated;
10
11// Broadcasting events
12void UMyManager::UpdateState(EMyState NewState)
13{
14    CurrentState = NewState;
15    OnStateChanged.Broadcast(NewState);
16    OnProgressUpdated.Broadcast(GetProgress(), GetStatusMessage());
17}

Step 2: Bind the Events

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Step 3: Test in Play In Editor

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1. Open the Unreal Editor and navigate to Edit > Plugins
2. Search for the plugin name and enable it
3. Restart the editor when prompted
4. Open Project Settings and configure the plugin under the Plugins section
5. Add the component to your Actor Blueprint
6. Configure the desired properties in the Details panel
7. Compile and test your Blueprint

Step 4: Expose Values to Designers

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 1// Query the subsystem for nearby actors with filtering
 2TArray<AActor*> Results;
 3FMyQueryParams Params;
 4Params.Origin = GetActorLocation();
 5Params.Radius = 1000.0f;
 6Params.MaxResults = 10;
 7Params.bIncludeHidden = false;
 8Params.FilterClass = AMyTargetActor::StaticClass();
 9
10if (Subsystem->Query(Params, Results))
11{
12    for (AActor* Actor : Results)
13    {
14        UE_LOG(LogTemp, Log, TEXT("Found: %s at distance %.1f"),
15            *Actor->GetName(),
16            FVector::Dist(Params.Origin, Actor->GetActorLocation()));
17    }
18}

Next Steps

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