[vtkusers] VTK Interactor problem
Alex Malyushytskyy
alexmalvtk at gmail.com
Fri Aug 23 17:54:52 EDT 2013
It seems more design than vtk question.
You have either to make all objects needed visible to MouseInteractorStyle2
or make
it notify class which knows what to do (ElectrodeDetectorPlugin ) that
certain event occurred.
It is up to you, but second way usually are object oriented friendlier.
Since you are using Qt anyway I would derive MouseInteractorStyle2 from
QObject. Make sure QObject is listed first otherwise you will have problem
with moc.
Do not forget Q_OBJECT macro, Then you can add signals you need , emit them
when certain event is caught in MouseInteractorStyle2.
connect signals with appropriate slots of ElectrodeDetectorPlugin.
Hope this helps.
Alex
On Fri, Aug 23, 2013 at 2:55 AM, Florian Schiffers <
florian.schiffers at physik.uni-erlangen.de> wrote:
> Hello,
>
> thank you again!
>
> I'll try to explain my problem again:
>
> I have this Class ElectrodeDetectorPlugin and there I have some vtkData
> like m_InputData, m_MaximaData etc.
>
> Basically I will load a 3D Model (m_InputData) into my renderWindow and at
> first I just want to transform the object in the normal way (spinning,
> zooming, roation, etc.)
>
> But than, I press a button on my GUI (with QT) and now I want the
> transformations to stop (for that I have Style2) and I than want to pick a
> point with - for example - the right mouse button event and the VTK Point
> Picker. After picking a point I want to do some operatios on m_InputData,
> m_MaximaData and than I want to redraw all of them!
>
> The big problem is: MouseInteractorStyle2 doesn't know the m_InputData,
> m_MaximaData objects and all the other functions of the
> ElectrodeDetectorPlugin etc.
> The same is for the callback functions, because they are no
> memberfunctions of the ElectrodeDetectorPlugin (as far as I see).
>
> Maybe it is not even a vtkProblem. Maybe it is more a problem of me
> understanding object-oriented programming C++. (I'm still a student and
> just a beginner in C++)
>
> The only way I was able to connect the Interactor with the member
> functions of ElectrodeDetectorPlugin was this way (But I dont like this
> way):
>
> m_QtSlotConnector->Connect(
> widget->GetRenderWindow()->GetInteractor(),
> vtkCommand::RightButtonPressEvent,
> this,SLOT(RightButtonPressEventHandling(vtkObject*, unsigned long, void*,
> void*)));
>
> thank you again!
> Flo
>
> Am 23.08.2013 00:11, schrieb Alex Malyushytskyy:
>
> I am am glad my comment helped somehow.
> I guess you MouseInteractorStyle1 and MouseInteractorStyle2 are subclasses
> of vtkInteractorStyle which you want set depending on your needs
> In this case why would you even need a callback?
> Do everything there.
>
> Also I do not think your code is valid.
> I doubt below code will even compile:
>
> vtkSmartPointer<MouseInteractorStyle1> style =
> vtkSmartPointer<MouseInteractorStyle1>::New(); // Style 1 for manipulation
> Spin/Pan etc.
> vtkSmartPointer<MouseInteractorStyle2> style =
> vtkSmartPointer<MouseInteractorStyle2>::New();
>
>
> You said you want different behavior for for example left mouse release
> depending on some conditions.
> This means you have a few choices:
>
> a) subclass interactor style and do all you need within that single
> class.
> b) switch between different interactor styles. For example check
> vtkInteractorStyleSwitch.
> c) use callbacks.
>
> I used a) and b) myself. Even though I have not used last approach I
> guess you would still at least to either subclass interactor style so it
> does nothing if actions of your interest happens or find an existent class
> which satisfies above conditions. Otherwise default interactor style will
> interfere with your code (For example rotation will happen when you want
> zoom or both )
>
>
> Hope this helps,
> Alex
>
>
>
> On Thu, Aug 22, 2013 at 3:26 AM, Florian Schiffers <
> florian.schiffers at physik.uni-erlangen.de> wrote:
>
>> Hello,
>>
>> thx for the answer. It helped me alot, but I still have the problem that
>> I cannot access to class member variables in a callback function or the
>> vtkInteractorStyleTrackballCamera Class.
>>
>> I have a structure like this:
>>
>> ( with pastebin: http://pastebin.com/qm42n1xh )
>>
>> void ClickCallbackFunction ( vtkObject* caller, long unsigned inteventId,
>> void* clientData, void* callData );
>> ElectrodeDetectorPlugin::ElectrodeDetectorPlugin(QVTKWidget *p):
>> QObject(){
>> m_InputData = vtkSmartPointer <vtkPolyData> ::
>> New();
>> m_InputDataActor = vtkSmartPointer <vtkActor> :: New();
>>
>> m_MaximaData = vtkSmartPointer<vtkPolyData>::New();
>> m_InputMaximaActor = vtkSmartPointer<vtkActor>::New();
>>
>> vtkSmartPointer<MouseInteractorStyle1> style =
>> vtkSmartPointer<MouseInteractorStyle1>::New(); // Style 1 for manipulation
>> Spin/Pan etc.
>> vtkSmartPointer<MouseInteractorStyle2> style =
>> vtkSmartPointer<MouseInteractorStyle2>::New();
>> ... ....
>> renderWindow->GetInteractor()->SetInteractorStyle( style );
>> vtkSmartPointer<vtkCallbackCommand> clickCallback = vtkSmartPointer<
>> vtkCallbackCommand>::New(); clickCallback->SetCallback (ClickCallbackFunction
>> ); renderWindowInteractor->AddObserver ( vtkCommand::
>> LeftButtonPressEvent, clickCallback );
>>
>> }
>> void ClickCallbackFunction ( vtkObject* vtkNotUsed(caller), long unsigned
>> int vtkNotUsed(eventId), void* vtkNotUsed(clientData), void* vtkNotUsed(
>> callData) ) { std::cout << "Click callback" << std::endl;
>>
>> // Get the interactor like this:
>> vtkRenderWindowInteractor *iren =
>> static_cast<vtkRenderWindowInteractor*>(caller);
>>
>> HERE I need to operations on m_InputData, m_MaximaData using PointPicker Methods
>> I also want to draw objects etc.
>> }
>>
>> I tried a lot of stuff, but they all didn't work. Do you have any idea?
>>
>> Thank you for your help!
>>
>> best regards,
>> Flo
>>
>> Am 21.08.2013 04:04, schrieb Alex Malyushytskyy:
>>
>> I just want to add thet currently set . vtkInteractorStyle is defining
>> which events are handled and how.
>> So subclassing and overriding appropriate functionality is way to go.
>> Also you can create multiple vtkInteractorStyle and set them active
>> according to your needs.
>>
>> Hope this helps.
>>
>> Alex
>>
>>
>> On Tue, Aug 20, 2013 at 4:08 PM, Alex Malyushytskyy <alexmalvtk at gmail.com
>> > wrote:
>>
>>> Subclass vtkInteractorStyle (or derived class ) you are using.
>>>
>>> All the operations: rotation, calls as results on Keypressevents are
>>> initiated there.
>>> Depending on the actual subclass of vtkInteractorStyle things what you
>>> need to do are different,
>>> For example to suppress Keypressevents for vtkInteractorStyleRubberBand
>>> subclass you can just override
>>> void vtkInteractorStyleRubberBand::OnChar() to do nothing.
>>>
>>> Regards,
>>> Alex
>>>
>>>
>>> On Tue, Aug 20, 2013 at 5:59 AM, Phys1k3r <
>>> florian.schiffers at physik.uni-erlangen.de> wrote:
>>>
>>>> Hello,
>>>>
>>>> I have written a vtk-programm that allows me to display a 3D data set
>>>> (VTK
>>>> and QT). Additonally you can interact with the 3D Data with
>>>> 'RightButtonPressEvent' and 'MiddleButtonPressEvent'. Both interaction
>>>> are
>>>> point picker interactions.
>>>>
>>>> My problem is, that for example, when I press the 'RightButton' two
>>>> things
>>>> happen at once:
>>>>
>>>> 1. Point on 3D Data get's picked
>>>> 2. Camera is zooming in/out (only when I move mouse during picking, but
>>>> this
>>>> happens from time to time)
>>>>
>>>> The same happens with 'MiddleButtonPressEvent', the objects just get
>>>> moved
>>>> instead.
>>>>
>>>> So basically I want a button on my GUI, where I can choose:
>>>> 1. Either Zoom in/out
>>>> 2. or pick a point
>>>>
>>>> As an alternative I would be satisfied with something like this:
>>>> 1. Just OnLeftButtonDown() -> Just Zoom/Pan/Spin
>>>> 2. OnLeftButtonDown() + KeePressEvent -> Don't zoom, pick point instead
>>>>
>>>> This is how I implemented the 'MiddleButtonPressEventHandling' by now:
>>>>
>>>>
>>>>
>>>> I know, this is not the best way, but it worked so far. I propably will
>>>> implement it this way in the near future:
>>>> http://www.vtk.org/Wiki/VTK/Examples/Cxx/Interaction/MouseEventsObserver
>>>>
>>>> But even when I use the MouseEventsObserver I still have no Idea how
>>>> suppress the Zoom/Pan/Spin Events...
>>>>
>>>> Than I thought of this method instead:
>>>> http://www.vtk.org/Wiki/VTK/Examples/Cxx/Interaction/MouseEvents
>>>>
>>>> First of all, I don't need (and also don't want) all the features of the
>>>> vtkInteractorStyle class like Keypressevents for p, r, s, u, v e (as
>>>> you can
>>>> find them here:
>>>> http://www.vtk.org/doc/nightly/html/classvtkInteractorStyle.html at
>>>> Detailed
>>>> Description)
>>>>
>>>> I just need to overwrite 'OnLeftButtonDown', 'OnMiddleButtonDown',
>>>> 'OnRightButtonDown' etc.
>>>>
>>>> So basically I tried things like this, but they don't work, of course:
>>>>
>>>>
>>>>
>>>>
>>>> Honestly I have no idea how to solve my problem... I also haven't found
>>>> much
>>>> documentary besides the examples.
>>>>
>>>> Thank you for your help, I really appreciate it
>>>> Phys1k3r
>>>>
>>>>
>>>>
>>>> --
>>>> View this message in context:
>>>> http://vtk.1045678.n5.nabble.com/VTK-Interactor-problem-tp5722887.html
>>>> Sent from the VTK - Users mailing list archive at Nabble.com.
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>>>
>>>
>>
>>
>
>
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