[vtkusers] Actor disappears when using one direction interactor style.

[Paul Douglas Hahn]

New to VTK, I found out I had to deal with triggering a repaint after 
changing positions of things in the scene from within event handlers -- 
with charts at least (context2d). I am not expert enough to give you an 
explicit answer for a fix, but the symptoms you describe do sound 
similar -- i.e., there needs to be a repaint triggered, at the end of 
the mouse move event handler and particularly at the end of mouse button 
up. I presume the former should probably happen in Pan(), and the latter 
in endPan(), but is not? But it could be some other issue, I suppose, so 
please take this newbie reply with a grain of salt.

- Paul

On 12/30/2017 07:12 AM, alican wrote:
> I am trying to limit actor's movement to one direction only.
> The question was already asked a couple of times and never answered.
> It initially looked straightforward, however I cannot make it work.
> When I start moving the mouse an actor is disappearing and for the life of
> me I do not know why.
> Can somebody please spot a problem?
> Thank you
> AC
>
> void MoveInteractorStyle::OnMouseMove()
> {
> 	if (m_Move && m_pActor)
> 	{
> 		int* pos = GetInteractor()->GetEventPosition();
>
> 		if (CommonUtils::isEmpty(m_CurrentPos))
> 		{
> 			m_CurrentPos = QVector3D(pos[0], pos[1], pos[2]);
> 			return;
> 		}
> 		QVector3D newPos(pos[0], pos[1], pos[2]);
>
> 		if (m_direction == X)
> 			m_pActor->SetPosition(newPos[0], m_CurrentPos[1], m_CurrentPos[2]);
> 		else if (m_direction == Y)
> 			m_pActor->SetPosition(m_CurrentPos[0], newPos[1], m_CurrentPos[2]);
> 		else if (m_direction == Z)
> 			m_pActor->SetPosition(m_CurrentPos[0], m_CurrentPos[1], newPos[2]);
> 		else
> 			m_pActor->SetPosition(newPos[0], newPos[1], newPos[2]);
>
> 		double* apos = m_pActor->GetPosition();
> 		qDebug() << "x " << apos[0] << " y " << apos[1] << " z " << apos[2];
> 		Pan();
>
> 		//vtkInteractorStyleTrackballActor::OnMouseMove();
> 	}
> 	else
> 		vtkInteractorStyleTrackballActor::OnMouseMove();
> }
>
>
> void MoveInteractorStyle::OnLeftButtonUp()
> {
>
> 	m_Move = false;
> 	m_pActor = nullptr;
> 	CommonUtils::empty(m_CurrentPos);
> 	//vtkInteractorStyleTrackballActor::OnLeftButtonUp();
> 	EndPan();
> }
>
> void MoveInteractorStyle::OnLeftButtonDown()
> {
> 	m_direction = X;
> 	m_Move = true;
> 	m_pActor = pickActor();
> 	StartPan();
> }
>
> vtkActor* MoveInteractorStyle::pickActor()
> {
> 	int* clickPos = GetInteractor()->GetEventPosition();
>
> 	// Pick from this location.
> 	vtkSmartPointer<vtkPropPicker>  picker =
> vtkSmartPointer<vtkPropPicker>::New();
> 	picker->Pick(clickPos[0], clickPos[1], 0, this->GetDefaultRenderer());
>
> 	double* pos = picker->GetPickPosition();
> 	return picker->GetActor();
> }
>
>
>
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-- 
Paul D. Hahn
CompIntense HPC, LLC