71 - The Hit Target

Source/Blaster/Character/BlasterCharacter.cpp

@@ -20,7 +20,7 @@ ABlasterCharacter::ABlasterCharacter()
 
 	CameraBoom = CreateDefaultSubobject<USpringArmComponent>(TEXT("CameraBoom"));
 	CameraBoom->SetupAttachment(GetMesh());
-	CameraBoom->TargetArmLength = 600.f;
+	CameraBoom->TargetArmLength = 350.f;
 	CameraBoom->bUsePawnControlRotation = true;
 
 	FollowCamera = CreateDefaultSubobject<UCameraComponent>(TEXT("FollowCamera"));

Source/Blaster/Components/CombatComponent.cpp

@@ -7,11 +7,12 @@
 #include "Blaster/Weapon/Weapon.h"
 #include "Engine/SkeletalMeshSocket.h"
 #include "GameFramework/CharacterMovementComponent.h"
+#include "Kismet/GameplayStatics.h"
 #include "Net/UnrealNetwork.h"
 
 UCombatComponent::UCombatComponent()
 {
-	PrimaryComponentTick.bCanEverTick = false;
+	PrimaryComponentTick.bCanEverTick = true;
 
 	BaseWalkSpeed = 600.f;
 	AimWalkSpeed = 350.f;
@@ -73,6 +74,52 @@ void UCombatComponent::FireButtonPressed(bool bPressed)
 	}
 }
 
+void UCombatComponent::TraceUnderCrosshairs(FHitResult& TraceHitResult)
+{
+	FVector2d ViewPortSize;
+	if (GEngine && GEngine->GameViewport)
+	{
+		GEngine->GameViewport->GetViewportSize(ViewPortSize);
+	}
+
+	FVector2d CrosshairLocation(ViewPortSize.X / 2.f, ViewPortSize.Y / 2.0f);
+	FVector CrosshairWorldPosition;
+	FVector CrosshairWorldDirection;
+	bool bScreenToWorld = UGameplayStatics::DeprojectScreenToWorld(
+		UGameplayStatics::GetPlayerController(this, 0),
+		CrosshairLocation,
+		CrosshairWorldPosition,
+		CrosshairWorldDirection
+	);
+
+	if (bScreenToWorld)
+	{
+		FVector Start = CrosshairWorldPosition;
+		FVector End = Start + CrosshairWorldDirection * TRACE_LENGTH;
+
+		GetWorld()->LineTraceSingleByChannel(
+			TraceHitResult,
+			Start,
+			End,
+			ECollisionChannel::ECC_Visibility
+		);
+		if (!TraceHitResult.bBlockingHit)
+		{
+			TraceHitResult.ImpactPoint = End;
+		}
+		else
+		{
+			DrawDebugSphere(
+				GetWorld(),
+				TraceHitResult.ImpactPoint,
+				12.f,
+				12,
+				FColor::Red
+			);
+		}
+	}
+}
+
 void UCombatComponent::ServerFire_Implementation()
 {
 	MulticastFire();
@@ -92,6 +139,8 @@ void UCombatComponent::TickComponent(float DeltaTime, ELevelTick TickType, FActo
 {
 	Super::TickComponent(DeltaTime, TickType, ThisTickFunction);
 
+	FHitResult HitResult;
+	TraceUnderCrosshairs(HitResult);
 }
 
 void UCombatComponent::EquipWeapon(AWeapon* WeaponToEquip)

Source/Blaster/Components/CombatComponent.h

@@ -6,6 +6,7 @@
 #include "Components/ActorComponent.h"
 #include "CombatComponent.generated.h"
 
+#define TRACE_LENGTH  80000
 
 UCLASS( ClassGroup=(Custom), meta=(BlueprintSpawnableComponent) )
 class BLASTER_API UCombatComponent : public UActorComponent
@@ -38,6 +39,8 @@ protected:
 
 	UFUNCTION(NetMulticast, Reliable)
 	void MulticastFire();
+
+	void TraceUnderCrosshairs(FHitResult& TraceHitResult);
 	
 private:
 	class ABlasterCharacter* Character;