Section 5 - The Weapon - Course 65

Hide Widget

.gitignore

@@ -72,3 +72,6 @@ Plugins/*/Intermediate/*
 
 # Cache files for the editor to use
 DerivedDataCache/*
+/Content/ModSci_Engineer/
+/Content/ModSci_EngiProps/
+/Content/ModSciInteriors/

Config/DefaultEngine.ini

@@ -1,8 +1,8 @@
 
 
 [/Script/EngineSettings.GameMapsSettings]
-GameDefaultMap=/Game/_Game/Maps/Factory.Factory
-EditorStartupMap=/Game/_Game/Maps/Factory.Factory
+GameDefaultMap=/Game/ModSciInteriors/Maps/Example_2_Dynamic.Example_2_Dynamic
+EditorStartupMap=/Game/ModSciInteriors/Maps/Example_2_Dynamic.Example_2_Dynamic
 GlobalDefaultGameMode=/Game/_Game/GameMode/ShooterGameModeBaseBP.ShooterGameModeBaseBP_C
 
 [/Script/HardwareTargeting.HardwareTargetingSettings]

Source/Shooter/Item.cpp

@@ -2,7 +2,11 @@
 
 
 #include "Item.h"
+
+#include "ShooterCharacter.h"
 #include "Components/BoxComponent.h"
+#include "Components/SphereComponent.h"
+#include "Components/WidgetComponent.h"
 
 // Sets default values
 AItem::AItem()
@@ -15,13 +19,27 @@ AItem::AItem()
 
 	CollisionBox = CreateDefaultSubobject<UBoxComponent>(TEXT("CollisionBox"));
 	CollisionBox->SetupAttachment(ItemMesh);
+	CollisionBox->SetCollisionResponseToAllChannels(ECollisionResponse::ECR_Ignore);
+	CollisionBox->SetCollisionResponseToChannel(ECollisionChannel::ECC_Visibility, ECollisionResponse::ECR_Block);
+
+	PickupWidget = CreateDefaultSubobject<UWidgetComponent>(TEXT("PickupWidget"));
+	PickupWidget->SetupAttachment(GetRootComponent());
+
+	AreaSphere = CreateDefaultSubobject<USphereComponent>(TEXT("AreaSphere"));
+	AreaSphere->SetupAttachment(GetRootComponent());
 }
 
 // Called when the game starts or when spawned
 void AItem::BeginPlay()
 {
 	Super::BeginPlay();
-	
+
+	// Hide Pickup Widget
+	PickupWidget->SetVisibility(false);
+
+	// Setup overlap for AreaSphere
+	AreaSphere->OnComponentBeginOverlap.AddDynamic(this, &AItem::OnSphereOverlap);
+	AreaSphere->OnComponentEndOverlap.AddDynamic(this, &AItem::OnSphereEndOverlap);
 }
 
 // Called every frame
@@ -31,3 +49,31 @@ void AItem::Tick(float DeltaTime)
 
 }
 
+void AItem::OnSphereOverlap(UPrimitiveComponent* OverlappedComponent, AActor* OtherActor, UPrimitiveComponent* OtherComp,
+	int32 OtherBodyIndex, bool bFromSweep, const FHitResult& SweepResult)
+{
+	if (OtherActor)
+	{
+		AShooterCharacter* ShooterCharacter = Cast<AShooterCharacter>(OtherActor);
+
+		if (ShooterCharacter)
+		{
+			ShooterCharacter->IncrementOverlappedItemCount(1);
+		}
+	}
+}
+
+void AItem::OnSphereEndOverlap(UPrimitiveComponent* OverlappedComponent, AActor* OtherActor,
+	UPrimitiveComponent* OtherComp, int32 OtherBodyIndex)
+{
+	if (OtherActor)
+	{
+		AShooterCharacter* ShooterCharacter = Cast<AShooterCharacter>(OtherActor);
+
+		if (ShooterCharacter)
+		{
+			ShooterCharacter->IncrementOverlappedItemCount(-1);
+		}
+	}
+}
+

Source/Shooter/Item.h

@@ -8,6 +8,7 @@
 
 class UBoxComponent;
 class UWidgetComponent;
+class USphereComponent;
 
 UCLASS()
 class SHOOTER_API AItem : public AActor
@@ -26,6 +27,17 @@ public:
 	// Called every frame
 	virtual void Tick(float DeltaTime) override;
 
+	/* Called when overlapping AreaSphere */
+	UFUNCTION()
+	void OnSphereOverlap(UPrimitiveComponent* OverlappedComponent, AActor* OtherActor,
+		UPrimitiveComponent* OtherComp, int32 OtherBodyIndex, bool bFromSweep,
+		const FHitResult& SweepResult);
+
+	/* Called when end overlapping AreaSphere */
+	UFUNCTION()
+	void OnSphereEndOverlap(UPrimitiveComponent* OverlappedComponent, AActor* OtherActor,
+		UPrimitiveComponent* OtherComp, int32 OtherBodyIndex);
+
 private:
 
 	/* Skeletal mesh for the item */
@@ -40,6 +52,10 @@ private:
 	UPROPERTY(EditAnywhere, BlueprintReadOnly, Category = "Item Properties", meta = (AllowPrivateAccess = true))
 	UWidgetComponent* PickupWidget;
 
-public:
+	/* Enables item tracing when overlapped */
+	UPROPERTY(EditAnywhere, BlueprintReadOnly, Category = "Item Properties", meta = (AllowPrivateAccess = true))
+	USphereComponent* AreaSphere;
 
+public:
+	FORCEINLINE UWidgetComponent* GetPickupWidget() const { return PickupWidget; }
 };

Source/Shooter/ShooterCharacter.cpp

@@ -3,7 +3,9 @@
 
 #include "ShooterCharacter.h"
 
+#include "Item.h"
 #include "Camera/CameraComponent.h"
+#include "Components/WidgetComponent.h"
 #include "Engine/SkeletalMeshSocket.h"
 #include "GameFramework/SpringArmComponent.h"
 #include "GameFramework/CharacterMovementComponent.h"
@@ -45,7 +47,9 @@ AShooterCharacter::AShooterCharacter() :
 	// Automatic fire
 	bShouldFire(true),
 	bFireButtonPressed(false),
-	AutomaticFireRate(0.1f)
+	AutomaticFireRate(0.1f),
+	// Item trace variables
+	bShouldTraceForItems(false)
 {
  	// Set this character to call Tick() every frame.  You can turn this off to improve performance if you don't need it.
 	PrimaryActorTick.bCanEverTick = true;
@@ -215,56 +219,24 @@ void AShooterCharacter::FireWeapon()
 
 bool AShooterCharacter::GetBeamEndLocation(const FVector& MuzzleSocketLocation, FVector& OutBeamLocation)
 {
-	// Get current size of the viewport
-	FVector2D ViewportSize;
+	// Check for crosshair trace hit
+	FHitResult CrosshairHitResult;
+	bool bCrosshairHit = TraceUnderCrosshairs(CrosshairHitResult, OutBeamLocation);
+	
+	// Perform a second trace, this time from the gun barrel
+	FHitResult WeaponTraceHit;
+	const FVector WeaponTraceStart{ MuzzleSocketLocation };
+	const FVector StartToEnd{ OutBeamLocation - MuzzleSocketLocation };
+	const FVector WeaponTraceEnd{ MuzzleSocketLocation + StartToEnd * 1.25f };
 
-	if (GEngine && GEngine->GameViewport)
+	GetWorld()->LineTraceSingleByChannel(WeaponTraceHit, WeaponTraceStart, WeaponTraceEnd,
+		ECollisionChannel::ECC_Visibility);
+
+	if (WeaponTraceHit.bBlockingHit) // Object between barrel and BeamEndPoint ?
 	{
-		GEngine->GameViewport->GetViewportSize(ViewportSize);
-	}
-
-	// Get screen space location of crosshairs
-	FVector2D CrosshairLocation{ ViewportSize.X / 2.f, ViewportSize.Y / 2.f };
-
-	// Get world position and direction of crosshairs
-	FVector CrosshairWorldPosition;
-	FVector CrosshairWorldDirection;
-	bool bScreenToWorld = UGameplayStatics::DeprojectScreenToWorld(
-		UGameplayStatics::GetPlayerController(this, 0),
-		CrosshairLocation, CrosshairWorldPosition, CrosshairWorldDirection);
-
-	if (bScreenToWorld)	// Was deprojection successful
-	{
-		FHitResult ScreenTraceHit;
-		const FVector Start{ CrosshairWorldPosition };
-		const FVector End{ CrosshairWorldPosition + CrosshairWorldDirection * 50'000.f };
-
-		// Set beam end point to line trace end point
-		OutBeamLocation = End;
-
-		// Trace outward from crosshairs world location
-		GetWorld()->LineTraceSingleByChannel(ScreenTraceHit, Start, End, ECollisionChannel::ECC_Visibility);
-		if (ScreenTraceHit.bBlockingHit)	// was there a trace hit ?
-		{
-			// Beam end point is now trace hit location
-			OutBeamLocation = ScreenTraceHit.Location;
-		}
-
-		FHitResult WeaponTraceHit;
-		const FVector WeaponTraceStart{ MuzzleSocketLocation };
-		const FVector WeaponTraceEnd{ OutBeamLocation };
-
-		GetWorld()->LineTraceSingleByChannel(WeaponTraceHit, WeaponTraceStart, WeaponTraceEnd,
-			ECollisionChannel::ECC_Visibility);
-
-		if (WeaponTraceHit.bBlockingHit) // Object between barrel and BeamEndPoint ?
-		{
-			OutBeamLocation = WeaponTraceHit.Location;
-		}
-
+		OutBeamLocation = WeaponTraceHit.Location;
 		return true;
 	}
-
 	return false;
 }
 
@@ -417,6 +389,83 @@ void AShooterCharacter::AutoFireReset()
 	}
 }
 
+bool AShooterCharacter::TraceUnderCrosshairs(FHitResult& OutHitResult, FVector& OutHitLocation)
+{
+	// Get Viewport Size
+	FVector2D ViewportSize;
+
+	if (GEngine && GEngine->GameViewport)
+	{
+		GEngine->GameViewport->GetViewportSize(ViewportSize);
+	}
+
+	// Get screen space location of crosshairs
+	FVector2D CrosshairLocation{ ViewportSize.X / 2.f, ViewportSize.Y / 2.f };
+
+	// Get world position and direction of crosshairs
+	FVector CrosshairWorldPosition;
+	FVector CrosshairWorldDirection;
+	bool bScreenToWorld = UGameplayStatics::DeprojectScreenToWorld(
+		UGameplayStatics::GetPlayerController(this, 0),
+		CrosshairLocation, CrosshairWorldPosition, CrosshairWorldDirection);
+
+	if (bScreenToWorld)
+	{
+		// Trace from Crosshair world location outward
+		const FVector Start{ CrosshairWorldPosition };
+		const FVector End{ Start + CrosshairWorldDirection * 50'000.f };
+		OutHitLocation = End;
+
+		GetWorld()->LineTraceSingleByChannel(OutHitResult, Start, End, ECollisionChannel::ECC_Visibility);
+
+		if (OutHitResult.bBlockingHit)
+		{
+			OutHitLocation = OutHitResult.Location;
+			return true;
+		}
+	}
+	return false;
+}
+
+void AShooterCharacter::TraceForItems()
+{
+	static AItem* HitItem;
+	if (bShouldTraceForItems)
+	{
+		FHitResult ItemTraceResult;
+		FVector HitLocation;
+		TraceUnderCrosshairs(ItemTraceResult, HitLocation);
+
+		if (ItemTraceResult.bBlockingHit)
+		{
+			// If an item was being looked at from last frame, we should hide its widget
+			SetItemPickupWidgetVisibility(HitItem, false);
+
+			// Show the new item's widget
+			HitItem = Cast<AItem>(ItemTraceResult.GetActor());
+			SetItemPickupWidgetVisibility(HitItem, true);
+		}
+		else if (HitItem) // Hide widget for the item from last frame
+		{
+			SetItemPickupWidgetVisibility(HitItem, false);
+			HitItem = nullptr;
+		}
+	}
+	else if (HitItem) // Hide widget for the item from last frame
+	{
+		SetItemPickupWidgetVisibility(HitItem, false);
+		HitItem = nullptr;
+	}
+}
+
+void AShooterCharacter::SetItemPickupWidgetVisibility(AItem* Item, bool visibility)
+{
+	if (Item && Item->GetPickupWidget())
+	{
+		Item->GetPickupWidget()->SetVisibility(visibility);
+	}
+}
+
 // Called every frame
 void AShooterCharacter::Tick(float DeltaTime)
 {
@@ -430,6 +479,8 @@ void AShooterCharacter::Tick(float DeltaTime)
 
 	// Calculate crosshair spread multiplier
 	CalculateCrosshairSpread(DeltaTime);
+
+	TraceForItems();
 }
 
 // Called to bind functionality to input
@@ -466,3 +517,17 @@ float AShooterCharacter::GetCrosshairSpreadMultiplier() const
 	return CrosshairSpreadMultiplier;
 }
 
+void AShooterCharacter::IncrementOverlappedItemCount(int8 Amount)
+{
+	if (OverlappedItemCount + Amount <= 0)
+	{
+		OverlappedItemCount = 0;
+		bShouldTraceForItems = false;
+	}
+	else
+	{
+		OverlappedItemCount += Amount;
+		bShouldTraceForItems = true;
+	}
+}
+

Source/Shooter/ShooterCharacter.h

@@ -11,6 +11,7 @@ class UCameraComponent;
 class USoundCue;
 class UParticleSystem;
 class UAnimMontage;
+class AItem;
 
 UCLASS()
 class SHOOTER_API AShooterCharacter : public ACharacter
@@ -88,6 +89,14 @@ protected:
 	UFUNCTION()
 	void AutoFireReset();
 
+	/** Line trace for items under the crosshairs */
+	bool TraceUnderCrosshairs(FHitResult& OutHitResult, FVector& OutHitLocation);
+
+	/* Trace for items if OverlappedItemCount > 0 */
+	void TraceForItems();
+
+	void SetItemPickupWidgetVisibility(AItem* Item, bool visibility);
+
 public:	
 	// Called every frame
 	virtual void Tick(float DeltaTime) override;
@@ -218,6 +227,12 @@ private:
 	/* Sets a timer between gunshots */
 	FTimerHandle AutoFireTimer;
 
+	/* True if we should trace every frame for items */
+	bool bShouldTraceForItems;
+
+	/* Number of overlapped AItems */
+	int8 OverlappedItemCount;
+
 public:
 	/* Returns CameraBoom SubObject */
 	FORCEINLINE USpringArmComponent* GetCameraBoom() const { return CameraBoom; }
@@ -229,4 +244,9 @@ public:
 
 	UFUNCTION(BlueprintCallable)
 	float GetCrosshairSpreadMultiplier() const;
+
+	FORCEINLINE int8 GetOverlappedItemCount() const { return OverlappedItemCount; }
+
+	/* Adds/Subtracts to/from OverlappedItemCount and updates bShouldTraceForItems */
+	void IncrementOverlappedItemCount(int8 Amount);
 };