Section 7: Game Interface

In this section, we took the time to add an interface for our player and enemy to provide feedback to the player.

Section Intro - Game Interface

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Designing the Player UI

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Pure Blueprint Functions

In this lecture, we learned how to define a pure blueprint function. Pure functions do not modify the class variables it belongs to. Therefore, these functions can be called at any time without an execution pin. To define a pure function, you must add the BlueprintPure specifier.

UFUNCTION(BlueprintPure)
float GetStatPercent(EStat Current, EStat Max);

The function will look like this in the blueprint event graph.

Updating the UI With Events

In this lecture, we created a set of events for when the health and stamina are updated. Here are the event definitions for them.

DECLARE_DYNAMIC_MULTICAST_SPARSE_DELEGATE_OneParam(
	FOnHealthPercentUpdateSignature,
	DECLARE_DYNAMIC_MULTICAST_SPARSE_DELEGATE_OneParam(
	FOnHealthPercentUpdateSignature,
	UStatsComponent, OnHealthPercentUpdateDelegate,
	float, Percentage
);

DECLARE_DYNAMIC_MULTICAST_SPARSE_DELEGATE_OneParam(
	FOnStaminaPercentUpdateSignature,
	UStatsComponent, OnStaminaPercentUpdateDelegate,
	float, Percentage
);

Next, we defined variables for storing the event's functions.

UPROPERTY(BlueprintAssignable)
FOnHealthPercentUpdateSignature OnHealthPercentUpdateDelegate;

UPROPERTY(BlueprintAssignable)
FOnStaminaPercentUpdateSignature OnStaminaPercentUpdateDelegate;

Lastly, we just broadcasted these events in various areas of our component. Specifically when the health is reduced, stamina is reduced, and stamina is regenerated. Here's one example of how we broadcasted the event.

OnStaminaPercentUpdateDelegate.Broadcast(
	GetStatPercent(EStat::Stamina, EStat::MaxStamina)
);

Fixing the Enemy’s Target Reset

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Designing the Enemy UI

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Finishing the Enemy UI

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Widget Animations

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Playing Widget Animations

In this lecture, we created a new event for when the health stat is reduced to 0. Unlike the other events we created for the stats component, this event does not send any data. To create an event that doesn't supply data, we must use the DECLARE_DYNAMIC_MULTICAST_SPARSE_DELEGATE macro.

DECLARE_DYNAMIC_MULTICAST_SPARSE_DELEGATE(
	FOnZeroHealthSignature,
	UStatsComponent, OnZeroHealthDelegate
);

Next, to broadcast the event, we must check if the health is actually 0. We performed this check during the ReduceHealth() function.

if (Stats[EStat::Health] == 0)
{
	OnZeroHealthDelegate.Broadcast();
}

Lastly, we took the time to play the widget animation and then waited for the animation to finish before proceeding to reload the current level.