34.UE5 RPG 实现鼠标点击移动 - 在帧循环中自动移动
最编程
2024-07-01 11:01:20
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现在自动寻路的路径有了，我们要实现角色的自动移动，那么，需要在帧循环里面实现。
//帧更新
void APlayerControllerBase::PlayerTick(float DeltaTime)
{
Super::PlayerTick(DeltaTime);
//鼠标位置追踪是否悬停在敌人身上
CursorTrace();
}
首先我们获取并判断一下Pawn是否存在
if(APawn* ControlledPawn = GetPawn())
由于无法确保角色位置和样条曲线百分之百重合在一块，所以我们先获取一下角色距离样条最近的位置
const FVector LocationOnSpline = Spline->FindLocationClosestToWorldLocation(ControlledPawn->GetActorLocation(), ESplineCoordinateSpace::World);
然后通过此位置去获取在样条上的方向
const FVector Direction = Spline->FindDirectionClosestToWorldLocation(LocationOnSpline, ESplineCoordinateSpace::World);
让角色通过此方向去移动
ControlledPawn->AddMovementInput(Direction);
我们还需要在角色移动到终点时，设置它停止寻路，所以，我们还需要查询当前角色所在位置和终点位置的距离，如果小于我们设置的AutoRunAcceptanceRadius距离内，我们将停止自动寻路。
const float DistanceToDestination = (LocationOnSpline - CachedDestination).Length();
if(DistanceToDestination <= AutoRunAcceptanceRadius)
{
bAutoRunning = false;
}
ps：这里还有一个问题，就是如果你点击位置为自动寻路无法到达的位置，导航还是会生成一条路径，但是我们无法达到最终点，这样无法停止自动寻路。所以，我们需要在鼠标抬起时，将路径的终点设置给CachedDestination，这也是自动寻路的最终点。
我们获取数组中的最后一个点，按照索引来算，就是数组的长度-1
CachedDestination = NavPath->PathPoints[NavPath->PathPoints.Num() - 1];
如果需要服务器，我们需要在导航系统设置运行客户端导航，这样，会在所有的客户端生成导航体积。
如果我们需要点击到柱子后面的地面，而不是忘柱子那里移动，我们需要修改柱子的碰撞预设为自定义
我们鼠标拾取地面位置是通过Visibility去拾取的，那么，将此相应通道关闭。
接下来，我们就可以测试了，查看是否有bug。
下面列出来PlayerController的完整代码
// 版权归暮志未晚所有。
#pragma once
#include "CoreMinimal.h"
#include "GameFramework/PlayerController.h"
#include "GameplayTagContainer.h"
#include "PlayerControllerBase.generated.h"
class USplineComponent;
class UInputConfig;
class UInputMappingContext;
class UInputAction;
struct FInputActionValue;
class IEnemyInterface;
class UAbilitySystemComponentBase;
/**
* 玩家控制器
*/
UCLASS()
class AURA_API APlayerControllerBase : public APlayerController
{
GENERATED_BODY()
public:
APlayerControllerBase();
virtual void PlayerTick(float DeltaTime) override;
protected:
virtual void BeginPlay() override; //游戏开始时触发
virtual void SetupInputComponent() override; //在生成输入组件时触发
private:
UPROPERTY(EditAnywhere, Category="Input")
TObjectPtr<UInputMappingContext> CharacterContext;
UPROPERTY(EditAnywhere, Category="Input")
TObjectPtr<UInputAction> MoveAction;
void Move(const struct FInputActionValue& InputActionValue);
void CursorTrace(); //鼠标位置追踪拾取
IEnemyInterface* LastActor; //上一帧拾取到的接口指针
IEnemyInterface* ThisActor; //这一帧拾取到的接口指针
void AbilityInputTagPressed(FGameplayTag InputTag);
void AbilityInputTagReleased(FGameplayTag InputTag);
void AbilityInputTagHold(FGameplayTag InputTag);
UPROPERTY(EditDefaultsOnly, Category="Input")
TObjectPtr<UInputConfig> InputConfig;
UPROPERTY()
TObjectPtr<UAbilitySystemComponentBase> AbilitySystemComponentBase;
UAbilitySystemComponentBase* GetASC();
FVector CachedDestination = FVector::ZeroVector; //存储鼠标点击的位置
float FollowTime = 0.f; // 用于查看按住了多久
bool bAutoRunning = false; //当前是否自动移动
bool bTargeting = false; //当前鼠标是否选中敌人
UPROPERTY(EditDefaultsOnly)
float ShortPressThreshold = 0.3f; //定义鼠标悬停多长时间内算点击事件
UPROPERTY(EditDefaultsOnly)
float AutoRunAcceptanceRadius = 50.f; //当角色和目标距离在此半径内时，将关闭自动寻路
UPROPERTY(VisibleAnywhere)
TObjectPtr<USplineComponent> Spline; //自动寻路时生成的样条线
void AutoRun();
};
// 版权归暮志未晚所有。
#include "Player/PlayerControllerBase.h"
#include "AbilitySystemBlueprintLibrary.h"
#include "EnhancedInputSubsystems.h"
#include "MyGameplayTags.h"
#include "NavigationPath.h"
#include "NavigationSystem.h"
#include "AbilitySystem/AbilitySystemComponentBase.h"
#include "Components/SplineComponent.h"
#include "Input/InputComponentBase.h"
#include "Interaction/EnemyInterface.h"
APlayerControllerBase::APlayerControllerBase()
{
bReplicates = true; //是否将数据传送服务器更新
LastActor = nullptr;
ThisActor = nullptr;
Spline = CreateDefaultSubobject<USplineComponent>("Spline");
}
//帧更新
void APlayerControllerBase::PlayerTick(float DeltaTime)
{
Super::PlayerTick(DeltaTime);
//鼠标位置追踪是否悬停在敌人身上
CursorTrace();
//自动寻路
AutoRun();
}
void APlayerControllerBase::AutoRun()
{
if(!bAutoRunning) return;
if(APawn* ControlledPawn = GetPawn())
{
//找到距离样条最近的位置
const FVector LocationOnSpline = Spline->FindLocationClosestToWorldLocation(ControlledPawn->GetActorLocation(), ESplineCoordinateSpace::World);
//获取这个位置在样条上的方向
const FVector Direction = Spline->FindDirectionClosestToWorldLocation(LocationOnSpline, ESplineCoordinateSpace::World);
ControlledPawn->AddMovementInput(Direction);
const float DistanceToDestination = (LocationOnSpline - CachedDestination).Length();
if(DistanceToDestination <= AutoRunAcceptanceRadius)
{
bAutoRunning = false;
}
}
}
//鼠标位置追踪
void APlayerControllerBase::CursorTrace()
{
FHitResult CursorHit;
GetHitResultUnderCursor(ECC_Visibility, false, CursorHit); //获取可视的鼠标命中结果
if(!CursorHit.bBlockingHit) return; //如果未命中直接返回
LastActor = ThisActor;
ThisActor = Cast<IEnemyInterface>(CursorHit.GetActor());
/**
* 射线拾取后，会出现的几种情况
* 1. LastActor is null ThisActor is null 不需要任何操作
* 2. LastActor is null ThisActor is valid 高亮ThisActor
* 3. LastActor is valid ThisActor is null 取消高亮LastActor
* 4. LastActor is valid ThisActor is valid LastActor ！= ThisActor 取消高亮LastActor 高亮ThisActor
* 5. LastActor is valid ThisActor is valid LastActor == ThisActor 不需要任何操作
*/
if(LastActor == nullptr)
{
if(ThisActor != nullptr)
{
//case 2
ThisActor->HighlightActor();
} // else case 1
}
else
{
if(ThisActor == nullptr)
{
//case 3
LastActor->UnHighlightActor();
}
else
{
if(LastActor != ThisActor)
{
//case 4
LastActor->UnHighlightActor();
ThisActor->HighlightActor();
} //else case 5
}
}
}
void APlayerControllerBase::AbilityInputTagPressed(const FGameplayTag InputTag)
{
if(InputTag.MatchesTagExact(FMyGameplayTags::Get().InputTag_LMB))
{
bTargeting = ThisActor != nullptr; //ThisActor为鼠标悬停在敌人身上才会有值
bAutoRunning = false;
FollowTime = 0.f; //重置统计的时间
}
}
void APlayerControllerBase::AbilityInputTagReleased(const FGameplayTag InputTag)
{
if(!InputTag.MatchesTagExact(FMyGameplayTags::Get().InputTag_LMB))
{
if(GetASC())
{
GetASC()->AbilityInputTagReleased(InputTag);
}
return;
}
if(bTargeting)
{
if(GetASC())
{
GetASC()->AbilityInputTagReleased(InputTag);
}
}
else
{
const APawn* ControlledPawn = GetPawn();
if(FollowTime <= ShortPressThreshold && ControlledPawn)
{
if(UNavigationPath* NavPath = UNavigationSystemV1::FindPathToLocationSynchronously(this, ControlledPawn->GetActorLocation(), CachedDestination))
{
Spline->ClearSplinePoints(); //清除样条内现有的点
for(const FVector& PointLoc : NavPath->PathPoints)
{
Spline->AddSplinePoint(PointLoc, ESplineCoordinateSpace::World); //将新的位置添加到样条曲线中
// DrawDebugSphere(GetWorld(), PointLoc, 8.f, 8, FColor::Orange, false, 5.f); //点击后debug调试
}
//自动寻路将最终目的地设置为导航的终点，方便停止导航
CachedDestination = NavPath->PathPoints[NavPath->PathPoints.Num() - 1];
bAutoRunning = true; //设置当前正常自动寻路状态，将在tick中更新位置
}
}
}
}
void APlayerControllerBase::AbilityInputTagHold(const FGameplayTag InputTag)
{
if(!InputTag.MatchesTagExact(FMyGameplayTags::Get().InputTag_LMB))
{
if(GetASC())
{
GetASC()->AbilityInputTagHold(InputTag);
}
return;
}
if(bTargeting)
{
if(GetASC())
{
//点击敌人目标，将攻击敌人
GetASC()->AbilityInputTagHold(InputTag);
}
}
else
{
FollowTime += GetWorld()->GetDeltaSeconds(); //统计悬停时间来判断是否为点击
FHitResult Hit;
if(GetHitResultUnderCursor(ECC_Visibility, false, Hit))
{
CachedDestination = Hit.ImpactPoint;
}
if(APawn* ControlledPawn = GetPawn())
{
const FVector WorldDirection = (CachedDestination - ControlledPawn->GetActorLocation()).GetSafeNormal();
ControlledPawn->AddMovementInput(WorldDirection);
}
}
}
UAbilitySystemComponentBase* APlayerControllerBase::GetASC()
{
if(AbilitySystemComponentBase == nullptr)
{
AbilitySystemComponentBase = Cast<UAbilitySystemComponentBase>(UAbilitySystemBlueprintLibrary::GetAbilitySystemComponent(GetPawn()));
}
return AbilitySystemComponentBase;
}
void APlayerControllerBase::BeginPlay()
{
Super::BeginPlay();
check(CharacterContext); //判断是否存在
//从本地角色身上获取到它的子系统
UEnhancedInputLocalPlayerSubsystem* Subsystem = ULocalPlayer::GetSubsystem<UEnhancedInputLocalPlayerSubsystem>(GetLocalPlayer());
// check(Subsystem); //检查子系统是否存在 不存在会打断
if(Subsystem)
{
//将自定义的操作映射上下文添加到子系统中
Subsystem->AddMappingContext(CharacterContext, 0); //可以存在多个操作映射，根据优先级触发
}
bShowMouseCursor = true; //游戏中是否显示鼠标光标
DefaultMouseCursor = EMouseCursor::Default; //鼠标光标的样式
FInputModeGameAndUI InputModeData;
InputModeData.SetLockMouseToViewportBehavior(EMouseLockMode::DoNotLock); //将鼠标锁定在视口内
InputModeData.SetHideCursorDuringCapture(false); //鼠标被捕获时是否隐藏
SetInputMode(InputModeData); //设置给控制器
}
void APlayerControllerBase::SetupInputComponent()
{
Super::SetupInputComponent();
UInputComponentBase* EnhancedInputComponent = CastChecked<UInputComponentBase>(InputComponent); //获取到增强输入组件
EnhancedInputComponent->BindAction(MoveAction, ETriggerEvent::Triggered, this, &APlayerControllerBase::Move); //绑定移动事件
EnhancedInputComponent->BindAbilityAction(InputConfig, this, &ThisClass::AbilityInputTagPressed,&ThisClass::AbilityInputTagReleased, &ThisClass::AbilityInputTagHold);
}
void APlayerControllerBase::Move(const FInputActionValue& InputActionValue)
{
const FVector2D InputAxisVector = InputActionValue.Get<FVector2D>(); //获取输入操作的2维向量值
const FRotator Rotation = GetControlRotation(); //获取控制器旋转
const FRotator YawRotation(0.f, Rotation.Yaw, 0.f); //通过控制器的垂直朝向创建一个旋转值，忽略上下朝向和左右朝向
const FVector ForwardDirection = FRotationMatrix(YawRotation).GetUnitAxis(EAxis::X); //获取世界坐标系下向前的值，-1到1
const FVector RightDirection = FRotationMatrix(YawRotation).GetUnitAxis(EAxis::Y); //获取世界坐标系下向右的值，-1到1
if(APawn* ControlledPawn = GetPawn<APawn>())
{
ControlledPawn->AddMovementInput(ForwardDirection, InputAxisVector.Y);
ControlledPawn->AddMovementInput(RightDirection, InputAxisVector.X);
}
}