Add enemy spawning

Source/vampires/VampireGameMode.cpp

@@ -3,3 +3,62 @@
 
 #include "VampireGameMode.h"
 
+#include "Kismet/GameplayStatics.h"
+
+void AVampireGameMode::BeginPlay()
+{
+	Super::BeginPlay();
+
+	PlayerCharacter = Cast<APlayerCharacter>(UGameplayStatics::GetPlayerCharacter(GetWorld(), 0));
+	PlayerController = Cast<AVampirePlayerController>(UGameplayStatics::GetPlayerController(PlayerCharacter, 0));
+
+	GetWorldTimerManager().SetTimer(SpawnEnemyTimerDelegate, this, &AVampireGameMode::SpawnEnemy, 1.0f, true);
+}
+
+void AVampireGameMode::SpawnEnemy()
+{
+	FVector TopLeft, TopLeftDir;
+	FVector TopRight, TopRightDir;
+	FVector BottomLeft, BottomLeftDir;
+	FVector BottomRight, BottomRightDir;
+	FVector CenterPos, CenterDir;
+
+	FVector2d ViewportSize;
+	GEngine->GameViewport->GetViewportSize(ViewportSize);
+
+	PlayerController->DeprojectScreenPositionToWorld(0, 0, TopLeft, TopLeftDir);
+	PlayerController->DeprojectScreenPositionToWorld(ViewportSize.X, 0, TopRight, TopRightDir);
+	PlayerController->DeprojectScreenPositionToWorld(0, ViewportSize.Y, BottomLeft, BottomLeftDir);
+	PlayerController->DeprojectScreenPositionToWorld(ViewportSize.X, ViewportSize.Y, BottomRight, BottomRightDir);
+	PlayerController->DeprojectScreenPositionToWorld(ViewportSize.X / 2, ViewportSize.Y / 2, CenterPos, CenterDir);
+
+	FVector SpawnLocation;
+	switch (FMath::RandRange(0, 3))
+	{
+	case 0:
+		SpawnLocation = FMath::Lerp(TopLeft, TopRight, FMath::RandRange(0.0f, 1.0f));
+		break;
+	case 1:
+		SpawnLocation = FMath::Lerp(TopRight, BottomRight, FMath::RandRange(0.0f, 1.0f));
+		break;
+	case 2:
+		SpawnLocation = FMath::Lerp(BottomRight, BottomLeft, FMath::RandRange(0.0f, 1.0f));
+		break;
+	case 3:
+		SpawnLocation = FMath::Lerp(BottomLeft, TopLeft, FMath::RandRange(0.0f, 1.0f));
+		break;
+	default:
+		UE_LOG(LogTemp, Warning, TEXT("Something broke"));
+		break;
+	}
+	
+	SpawnLocation.Z = PlayerCharacter->GetActorLocation().Z;
+	FTransform Transform;
+	Transform.SetLocation(SpawnLocation);
+	
+	FActorSpawnParameters SpawnParameters;
+	SpawnParameters.SpawnCollisionHandlingOverride = ESpawnActorCollisionHandlingMethod::AlwaysSpawn;
+	
+	AEnemyCharacter* actor = GetWorld()->SpawnActor<AEnemyCharacter>(EnemyTemplate, Transform, SpawnParameters);
+	actor->SpawnDefaultController();
+}

Source/vampires/VampireGameMode.h

@@ -3,6 +3,9 @@
 #pragma once
 
 #include "CoreMinimal.h"
+#include "EnemyCharacter.h"
+#include "PlayerCharacter.h"
+#include "VampirePlayerController.h"
 #include "GameFramework/GameMode.h"
 #include "VampireGameMode.generated.h"
 
@@ -13,5 +16,21 @@ UCLASS()
 class VAMPIRES_API AVampireGameMode : public AGameMode
 {
 	GENERATED_BODY()
-	
+
+public:
+	UPROPERTY(EditDefaultsOnly)
+	TSubclassOf<AEnemyCharacter> EnemyTemplate;
+
+private:
+	APlayerCharacter* PlayerCharacter;
+
+	AVampirePlayerController* PlayerController;
+
+	FTimerHandle SpawnEnemyTimerDelegate;
+
+protected:
+	virtual void BeginPlay() override;
+
+	UFUNCTION()
+	void SpawnEnemy();
 };