【UE4 C++】06-绑定运动输入（实现前后移动、鼠标转向）

**UE4 C++06 - 绑定运动输入**

在 UE4 中，运动输入是指玩家通过键盘或鼠标控制游戏中的角色或物体移动。实现前后移动、鼠标转向等功能需要绑定相应的输入事件。在本文中，我们将一步步地讲解如何实现这些功能。

###1. 创建一个新项目首先，创建一个新的 UE4项目。选择 "Third-Person" 模板，并命名为 "MyGame"。

###2. 添加 C++ 类在 UE4 中，我们需要添加一个 C++ 类来处理运动输入。在 "Content Browser" 中，右键点击 "Source" 文件夹，选择 "New Class..."。命名为 "MyCharacterInput"。

###3. 实现前后移动实现前后移动的关键是绑定 W 和 S 键（或相应的方向键）。我们需要在 `MyCharacterInput` 类中添加一个函数来处理这些事件。

cpp// MyCharacterInput.hclass AMyCharacter;
UCLASS()
class MYGAME_API AMoveCharacter : public AActor{
 GENERATED_BODY()

public:
 UFUNCTION()
 void MoveForward(float Value);

private:
 UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = "Move Character", meta = (AllowPrivateAccess = "true"))
 class AMyCharacter* MyCharacter;
};

// MyCharacterInput.cppvoid AMoveCharacter::MoveForward(float Value)
{
 // 获取玩家角色 AMyCharacter* Character = GetCharacter();

 // 如果有角色，则移动角色 if (Character != nullptr)
 {
 Character->SetVelocity(Value);
 }
}

cpp// MyCharacter.hclass AMoveCharacter;
UCLASS()
class MYGAME_API AMyCharacter : public AActor{
 GENERATED_BODY()

public:
 UFUNCTION()
 void SetVelocity(float Value);

private:
 UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = "Move Character", meta = (AllowPrivateAccess = "true"))
 class AMoveCharacter* MoveCharacter;
};

// MyCharacter.cppvoid AMyCharacter::SetVelocity(float Value)
{
 // 设置角色速度 Velocity = Value * GetWorld()->GetDeltaSeconds();
}

cpp// MyCharacterInput.hclass AMyCharacter;
UCLASS()
class MYGAME_API AMoveCharacter : public AActor{
 GENERATED_BODY()

public:
 UFUNCTION()
 void RotateCamera(float Value);

private:
 UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = "Move Character", meta = (AllowPrivateAccess = "true"))
 class AMyCharacter* MyCharacter;
};

// MyCharacterInput.cppvoid AMoveCharacter::RotateCamera(float Value)
{
 // 获取玩家角色 AMyCharacter* Character = GetCharacter();

 // 如果有角色，则旋转摄像机 if (Character != nullptr)
 {
 Character->SetCameraRotation(Value);
 }
}

cpp// MyCharacter.hclass AMoveCharacter;
UCLASS()
class MYGAME_API AMyCharacter : public AActor{
 GENERATED_BODY()

public:
 UFUNCTION()
 void SetCameraRotation(float Value);

private:
 UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = "Move Character", meta = (AllowPrivateAccess = "true"))
 class AMoveCharacter* MoveCharacter;
};

// MyCharacter.cppvoid AMyCharacter::SetCameraRotation(float Value)
{
 // 设置摄像机旋转角度 CameraRotation += Value * GetWorld()->GetDeltaSeconds();
}

cpp// MyCharacterInput.hclass AMyCharacter;
UCLASS()
class MYGAME_API AMoveCharacter : public AActor{
 GENERATED_BODY()

public:
 UFUNCTION()
 void MoveForward(float Value);

 UFUNCTION()
 void RotateCamera(float Value);

private:
 UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = "Move Character", meta = (AllowPrivateAccess = "true"))
 class AMyCharacter* MyCharacter;
};

// MyCharacterInput.cppvoid AMoveCharacter::SetupPlayerInputComponent(UInputComponent* PlayerInputComponent)
{
 Super::SetupPlayerInputComponent(PlayerInputComponent);

 // 绑定 W 和 S 键 PlayerInputComponent->BindAxis("MoveForward", this, &AMoveCharacter::MoveForward);

 // 绑定鼠标滚轮事件 PlayerInputComponent->BindAxis("RotateCamera", this, &AMoveCharacter::RotateCamera);
}