I am continuing the Battery Collector tutorial. This is the 16th video. Click here for the first part and here for the previous one.

Enabling UMG

PowerToWin

In BatteryCollectorGameMode.h, I am declaring a protected property PowerToWin:

	/** The power needed to win the game */
	UPROPERTY(EditDefaultsOnly, BlueprintReadWrite, Category = "Power", Meta = (BlueprintProtected = "true"))
	float PowerToWin;

I am also modifying the DecayRate property to make it Blueprint protected too.
I need an accessor for the HUD, so I declare it:

	/** Returns power needed to win - needed for the HUD */
	UFUNCTION(BlueprintPure, Category = "Power")
	float GetPowerToWin() const;

Because, the PowerToWin value is based on Character initial power, I need to define it in the BeginPlay function instead of the constructor. So I have to declare an override BeginPlay function:

	virtual void BeginPlay() override;

In BatteryCollectorGameMode.cpp, I am defining my BeginPlay function:

void ABatteryCollectorGameMode::BeginPlay()
{
	Super::BeginPlay();

	// set the score to beat
	ABatteryCollectorCharacter* MyCharacter = Cast(UGameplayStatics::GetPlayerPawn(this, 0));
	if (MyCharacter)
	{
		PowerToWin = (MyCharacter->GetInitialPower())*1.25f;
	}
}

I am defining the GetPowerToWin function:

float ABatteryCollectorGameMode::GetPowerToWin() const
{
	return PowerToWin;
}

UMG in C++

In order to use UMG with C++, I need to modify some settings. I am modifying the file BatteryCollector.build.cs and add “UMG” to the list of public modules. I am also adding “Slate” and “SlateCore” to the list of private modules:

public class BatteryCollector : ModuleRules
{
	public BatteryCollector(TargetInfo Target)
	{
		PublicDependencyModuleNames.AddRange(new string[] { "Core", "CoreUObject", "Engine", "InputCore", "UMG" });

        PrivateDependencyModuleNames.AddRange(new string[] { "Slate", "SlateCore" });
	}
}

In BatteryCollector.h, I am changing the include EngineMinimal.h by Engine.h

I need to regenerate my project files by right clicking on my BatteeryCollector.uproject file:

Hud

In BatteryCollectorMode.h, I am declaring a property to define the HUD class and the CurrentWidget:

	/** The widget class to use for our HUD screen */
	UPROPERTY(EditDefaultsOnly, BlueprintReadWrite, Category = "Power", Meta = (BlueprintProtected = "true"))
	TSubclassOf HUDWidgetClass;

	/** The instance of the HUD */
	UPROPERTY()
	class UUserWidget* CurrentWidget;

In BatteryCollectorGameMode.cpp, I am including UserWidget.h:

#include "Blueprint/UserWidget.h"

It is important to have generated the Visual Studio project files to be able to include this file.

I am continuing the BeginPlay function to display the HUD:

	if (HUDWidgetClass != nullptr)
	{
		CurrentWidget = CreateWidget(GetWorld(), HUDWidgetClass);
		if (CurrentWidget != nullptr)
		{
			CurrentWidget->AddToViewport();
		}
	}

Next Step

Next, I will create the HUD blueprint