Getting mouse position with a catch

Development Programming & Scripting C++
1

Is it possible if yes how can I get the mouse position within an actor class in c++ ?

2

Hi! Tseno. Check this:



void AMyActor::Tick(float DeltaTime)
{
    Super::Tick(DeltaTime);

    if (GetWorld())
    {
        FVector2D pos;
        GetWorld()->GetGameViewport()->GetMousePosition(pos);
        //GetWorld()->GetFirstLocalPlayerFromController()->ViewportClient->GetMousePosition(pos);

        UE_LOG(LogTemp, Warning, TEXT("x:%f y:%f"), pos.X, pos.Y);
        if (GEngine)
            GEngine->AddOnScreenDebugMessage(-1, 1.f, FColor::Blue, FString::Printf(TEXT("x:%f y:%f"), pos.X, pos.Y));
    }
}

Hope this helps!

3

Hi Andrew

I managed to do it myself like this including the Engine.h file



FVector2D mouse_coordinates;
GEngine->GameViewport->GetMousePosition(mouse_coordinates);

Which also works, but now looking at your code I’m not sure if its the best way to do it, thanks a for the help!
Also another thing, do you know how to implement mouse input from inside the actor? Currently i’m including Windows.h and using GetAsyncKeyState(VK_LBUTTON) to determine if mouse left click has occurred just because it’s easy. (And to be honest am wondering if I should leave it like that because I’m not worried about compatibility)
​​​​​​​

4

Hi Tseno. If you don’t care about crossplatform development you can use WinAPI.

But maybe you need clicked (Mouse Left) on actor-cube in game:

  1. First create custom PlayerController (BP or C++) and in MouseInterface check Enable Click Events
    https://docs.unrealengine.com/en-US/…seControlSetup

  2. MyGameBaseMode.cpp find and set custom PlayerController:



AMyGameBaseMode::AMyGameBaseMode()
    : Super()
{
    static ConstructorHelpers::FClassFinder<APlayerController> PlayerControllerClassFinder(TEXT("/Game/My_PlayerController"));
    PlayerControllerClass = PlayerControllerClassFinder.Class;
};

In ProjectSettings → Maps&Modes → Default Modes → Default GameMode set MyGameBaseMode

  1. **MyActor.cpp **and call function (AMyActor::OnClickedCall) from dynemic multi-cast delegate
    https://docs.unrealengine.com/en-US/…egates/Dynamic


void AMyActor::BeginPlay()
{
    // ...
    UStaticMeshComponent *CustomMeshComponent = FindComponentByClass<UStaticMeshComponent>(); // drag-drop cube in ueditor for test
    if (CustomMeshComponent)
    {
        UE_LOG(LogTemp, Warning, TEXT("AMyActor::AMyActor CustomMeshComponent"));
        CustomMeshComponent->OnClicked.AddDynamic(this, &AMyActor::OnClickedCall);
    }
}


/*
UE_4.20.2/Engine/Source/Runtime/Engine/Classes/Components/PrimitiveComponent.h
line 157 about signature delegate

DECLARE_DYNAMIC_MULTICAST_DELEGATE_TwoParams( FComponentOnClickedSignature, UPrimitiveComponent*, TouchedComponent , FKey, ButtonPressed);
DECLARE_DYNAMIC_MULTICAST_DELEGATE_TwoParams( FComponentOnReleasedSignature, UPrimitiveComponent*, TouchedComponent, FKey, ButtonReleased);

line 897 OnClicked, OnReleased info
Event called when the left mouse button is clicked/released while the mouse is over this component and click events are enabled in the player controller */
*/

void AMyActor::OnClickedCall(UPrimitiveComponent* TouchedComponent, FKey ButtonPressed)
{
    UE_LOG(LogTemp, Warning, TEXT("AMyActor::OnClickedCall"));
}

MyActor.h




//...
#include "Runtime/Engine/Classes/Components/PrimitiveComponent.h"
#include "Runtime/Core/Public/Delegates/Delegate.h"
//...

UCLASS()
class MYPROJECTTHREAD_API AMyActor : public AActor
{
    GENERATED_BODY()
    //...
    public:
        UFUNCTION()
        void OnClickedCall(UPrimitiveComponent* TouchedComponent, FKey ButtonPressed)
    //...
};

**In addition **check Bindings:
https://docs.unrealengine.com/en-US/…wTo/SetUpInput

Hope this helps. Good luck!