update: 2016/11/20
reference:
1. Actor Spawning and GetDefaultObject | Orfeas Eleftheriou
2. I touchs: Unreal: Adding a C++ Class
3. I touchs: Unreal: Exposing C++ variables to Blueprints
4. I touchs: Unreal: Exposing C++ functions to Blueprints
5. I touchs: Unreal: Add Override C++ Event Functions in Blueprints
6. I touchs: Unreal: Create C++ Blueprint Function Library
7. I touchs: Unreal: Casting types in C++
A. 新增 "要被生成的角色" 之 C++ 類別
1. 可以接續 I touchs: Unreal: Casting types in C++ 的專案
2. Add New > New C++ Class...
3. 選擇 "Actor" 作為 Parent Class > Next
4. 幫新增的 Class 命名: UsefulActor > Create Class
B. 幫 UsefulActor 新增 DoSomething() 函式宣告與內容
1. 修改: UsefulActor.h
....
//@add ######
UFUNCTION(BlueprintCallable, Category = "MyUsefulFunction")
void DoSomething();
....
....
//@add ######
void AUsefulActor::DoSomething()
{
GLog->Log("UsefulActor does something...");
}
....
-----------------------------------------------------------------------------------------------
C. 新增繼承自 UsefulActor 的 Blueprint 類別:
1. Add New > Blueprint Class
2. 搜尋選擇 "UsefulActor" 作為 Parent Class > Next
> 新增一個 static mesh (在此為 Sphere),
> 主要用來被告知角色何時生成了, 並調整其大小.
D. 新增 "用來生成角色" 的 C++ 類別
1. Add New > New C++ Class...
2. 選擇 "Actor" 作為 Parent Class > Next
3. 幫新增的 Class 命名: ActorSpawner > Create Class
E. 幫 ActorSpawner 新增宣告與內容
1. 修改: ActorSpawner.h
a. 加入 UsefulActor.h 標頭檔 (必須要在 ActorSpawner.generated.h 之前)
....
#include "GameFramework/Actor.h"
//@add ######
#include "UsefulActor.h"
#include "ActorSpawner.generated.h"
....
....
/*Blueprint Reference of UsefulActor class*/
UPROPERTY(EditDefaultsOnly,Category="ActorSpawning")
TSubclassOf<AUsefulActor> UsefulActorBP;
/*Delay after the Blueprint of the UsefulActor will get spawned*/
UPROPERTY(EditDefaultsOnly, Category = "ActorSpawning")
float TimeToSpawn = 2.f;
/*Spawns the UsefulActor Blueprint*/
UFUNCTION()
void SpawnUsefulActor();
....
2. 修改: ActorSpawner.cpp
....
void AActorSpawner::BeginPlay()
{
Super::BeginPlay();
//@add ######
FTimerHandle OutHandle;
//Will call SpawnUsefulActor after the specified time
GetWorld()->GetTimerManager().SetTimer(OutHandle, this, &AActorSpawner::SpawnUsefulActor, TimeToSpawn);
}
....
....
void AActorSpawner::SpawnUsefulActor()
{
//If the usefulactorbp is valid
if(UsefulActorBP)
{
//Spawn parameters for the current spawn.
//We can use this for a number of options like disable collision or adjust the spawn position
//if a collision is happening in the spawn point etc..
FActorSpawnParameters SpawnParams;
//Actual Spawn. The following function returns a reference to the spawned actor
AUsefulActor* ActorRef = GetWorld()->SpawnActor<AUsefulActor>(UsefulActorBP, GetTransform(), SpawnParams);
GLog->Log("Spawned the UsefulActor.");
}
}
....
-----------------------------------------------------------------------------------------------
F. 新增繼承自 ActorSpawner 的 Blueprint 類別:
1. Add New > Blueprint Class
2. 搜尋選擇 "ActorSpawner" 作為 Parent Class > Next
> 在 Details 裡, 將 UsefulActorBP 屬性設為: BP_UsefulActor
(備註: 因為我們將 static mesh(Sphere) 存放在 BP_UsefulActor 裡)
G. 測試
1. 將 BP_ActorSpawner 拖拉到場景.
> 在經過 Time To Spawn 秒數後,(在此為 2 秒) 就會生成 Sphere Actor
Output log:
-----------------------------------------------------------------------------------------------
H. 呼叫 UsefulActor 的 DoSomething 方法
1. 修改 AActorSpawner::SpawnUsefulActor() 函式
....
//@add ######
//UsefulActorBP->DoSomething(); // ----> error
UsefulActorBP->GetDefaultObject<AUsefulActor>()->DoSomething();
....
get the parent class of the subclass we’ve used above
(which is where the c++ functions “reside”).
2. 編譯並執行:
Output log:
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