From 2e59bb6e0e2c118c8ac4a07dc79117a453e5413a Mon Sep 17 00:00:00 2001
From: baz <bazzadobs@live.co.uk>
Date: Wed, 26 Jun 2024 00:17:14 +0100
Subject: [PATCH] Add enemy spawning

---
 Content/Gamemode/BP_DefaultGamemode.uasset |  4 +-
 Source/vampires/VampireGameMode.cpp        | 59 ++++++++++++++++++++++
 Source/vampires/VampireGameMode.h          | 21 +++++++-
 3 files changed, 81 insertions(+), 3 deletions(-)

diff --git a/Content/Gamemode/BP_DefaultGamemode.uasset b/Content/Gamemode/BP_DefaultGamemode.uasset
index ac85e62..82d5e9b 100644
--- a/Content/Gamemode/BP_DefaultGamemode.uasset
+++ b/Content/Gamemode/BP_DefaultGamemode.uasset
@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:88e3e3207b0f1b3c1444a2d232dbf2c320a94fa3c97733c3eec6fd9712229814
-size 21126
+oid sha256:94e59ead95ffb4f9a230fa05df1e608852c96e459d1caea091b031156997e65d
+size 21323
diff --git a/Source/vampires/VampireGameMode.cpp b/Source/vampires/VampireGameMode.cpp
index 7f36029..9b7f1fa 100644
--- a/Source/vampires/VampireGameMode.cpp
+++ b/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();
+}
diff --git a/Source/vampires/VampireGameMode.h b/Source/vampires/VampireGameMode.h
index b869eb9..c2313f1 100644
--- a/Source/vampires/VampireGameMode.h
+++ b/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();
 };