how to check if location at UImage brush is transparent?

Development Programming & Scripting C++
1

I have UUserWidget with UImage in WidgetTree, UImage brush is pgn with colored shape on transparent, i need to check if cursor is over shape or transparent somehow, to make hover effect work propertly. Any ideas how to make this work?

2 

FColor* data = static_cast<FColor*>((Texture->PlatformData->Mips[0]).BulkData.Lock(LOCK_READ_ONLY));

    if (data)
    {
        if (ImageData[location].A <= 0)
        {
            GEngine->AddOnScreenDebugMessage(-1, 3.f, FColor::Cyan, TEXT("TRANSPARENT"));
        }
        else
        {
            GEngine->AddOnScreenDebugMessage(-1, 3.f, FColor::Cyan, TEXT("NOT TRANSPARENT"));
        }
    }

    Texture->PlatformData->Mips[0].BulkData.Unlock();
3

If you mean to get the color or transparency of what is on screen, then you could use this function:

https://docs.unrealengine.com/latest/INT/API/Runtime/Core/GenericPlatform/FGenericPlatformMisc/GetScreenPixelColor/index.html


 static [FLinearColor](https://docs.unrealengine.com/latest/INT/API/Runtime/Core/Math/FLinearColor/index.html) GetScreenPixelColor
(
    const struct [FVector2D](https://docs.unrealengine.com/latest/INT/API/Runtime/Core/Math/FVector2D/index.html) & InScreenPos,
    float InGamma
)

And try using the mouse location as the InScreenPos. I’ve not tried this but it may work.

Cheers