blaster/Source/Blaster/Weapon/ProjectileBullet.cpp

// Fill out your copyright notice in the Description page of Project Settings.


#include "ProjectileBullet.h"

#include "GameFramework/Character.h"
#include "GameFramework/ProjectileMovementComponent.h"
#include "Kismet/GameplayStatics.h"

AProjectileBullet::AProjectileBullet()
{
	ProjectileMovementComponent = CreateDefaultSubobject<UProjectileMovementComponent>(TEXT("ProjectileMovementComponent"));
	ProjectileMovementComponent->bRotationFollowsVelocity = true;
	ProjectileMovementComponent->SetIsReplicated(true);
	ProjectileMovementComponent->InitialSpeed = InitialSpeed;
	ProjectileMovementComponent->MaxSpeed = InitialSpeed;
}

#if WITH_EDITOR
void AProjectileBullet::PostEditChangeProperty(FPropertyChangedEvent& Event)
{
	Super::PostEditChangeProperty(Event);

	const FName PropertyName = Event.Property != nullptr ? Event.Property->GetFName() : NAME_None;
	if (PropertyName == GET_MEMBER_NAME_CHECKED(AProjectileBullet, InitialSpeed))
	{
		if (ProjectileMovementComponent)
		{
			ProjectileMovementComponent->InitialSpeed = InitialSpeed;
			ProjectileMovementComponent->MaxSpeed = InitialSpeed;
		}
	}
}
#endif

void AProjectileBullet::OnHit(UPrimitiveComponent* HitComp, AActor* OtherActor, UPrimitiveComponent* OtherComp, FVector NormalImpulse, const FHitResult& Hit)
{
	ACharacter* OwnerCharacter = Cast<ACharacter>(GetOwner());
	if (OwnerCharacter)
	{
		AController* OwnerController = OwnerCharacter->Controller;
		if (OwnerController)
		{
			UGameplayStatics::ApplyDamage(OtherActor, Damage, OwnerController, this, UDamageType::StaticClass());
		}
	}
	
	Super::OnHit(HitComp, OtherActor, OtherComp, NormalImpulse, Hit);
}

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

	FPredictProjectilePathParams PathParams;
	PathParams.bTraceWithChannel = true;
	PathParams.bTraceWithCollision = true;
	PathParams.DrawDebugTime = 5.f;
	PathParams.DrawDebugType = EDrawDebugTrace::ForDuration;
	PathParams.LaunchVelocity = GetActorForwardVector() * InitialSpeed;
	PathParams.MaxSimTime = 4.f;
	PathParams.ProjectileRadius = 5.f;
	PathParams.SimFrequency = 30.f;
	PathParams.StartLocation = GetActorLocation();
	PathParams.TraceChannel = ECollisionChannel::ECC_Visibility;
	PathParams.ActorsToIgnore.Add(this);
	
	FPredictProjectilePathResult PathResult;
	UGameplayStatics::PredictProjectilePath(this, PathParams, PathResult);
}