Get offset in editor when moving actor in code

Development Programming & Scripting
1

Hi!

When I run the following code:

void ATestUnit::PostEditMove(bool bFinished)
{	
	if (bFinished && RootComponent != nullptr)
	{
		auto loc = this->GetActorLocation();

		// Should only be allowed to be placed in tiles of a grid
		loc.Y = ((int)loc.Y) / tileSize * tileSize ; // couldn't find any fmod function...
		loc.X = ((int)loc.X) / tileSize * tileSize ;
		loc.Z = 0;

		RootComponent->SetWorldLocation(loc);
	}
	AActor::PostEditMove(bFinished);
}

I get an offset from the xyz arrows to the actor’s mesh representation. However if I just selects the actor again there is no longer any offset for the xyz arrows. It’s not very much of a problem but is this the expected behavior of this code. If so am I missing some update call to the editor or something? (The mesh is the root component node.)

2

That’s basically the same thing we’re doing internally to make our actors on fortnite snap to a grid. You may want to try this as well, I can’t remember if this updates the widget, but it does force some things to redraw:

FEditorSupportDelegates::RedrawAllViewports.Broadcast();

Also, FMath::GridSnap is a good way to do that, it’s a fmod + round

3

FMath::GridSnap can come handy. FEditorSupportDelegates::RedrawAllViewports.Broadcast(); doesn’t seems to fix the offset problem though.

4

I think I remember us trying to solve it, and then just living with the issue. It wasn’t a big deal in practice with our level designers

5

Okay, thank you for the help =) I will consider the question solved.