[vtkusers] Qt & VTK 2d plotting
Justin Giles
jtgiles at gmail.com
Mon Feb 23 22:32:09 EST 2009
Ok, so if I understand this correctly, with any 2d plots in VTK, you cannot
interact with them unless you create your own mouse/keyboard listeners with
your own custom code to do what you want?
That leads to another question......
I see a lot of vtkQtChart stuff in the source code with a few examples. It
looks as if that code base has interaction built in and it seems to be 2d
plots as well. Any comments on the vtkQtChart stuff? I haven't been able
to get it to work due to a flaw in the cmake files in the
GUISupport/Qt/Chart area (already filed a bug report).
Thanks for any input with this. I appreciate the responses so far. It's a
big help!
Justin
On Mon, Feb 23, 2009 at 4:37 PM, Shakes
<Shekhar.Chandra at sci.monash.edu.au>wrote:
> Hi Justin,
>
> Someone correct me if I'm wrong, but I don't think u can interact with it
> as the plot is not in a 3D scene (i.e., its a not plane in a 3D scene).
>
> This is difference between vtkImageViewer and vtkImageViewer2, the latter
> is in a 3D scene and you can interact with it.
>
> I used the following to "zoom" XY Plots:
>
> //Scale
> plotActor->SetWidth(factor);
> plotActor->SetHeight(factor);
> //Reposition
> plotActor->SetPosition(pos[0]-factor*pos[0], pos[1]-factor*pos[1]);
>
> HTH
> Cheers
> Shakes
>
> Justin Giles wrote:
>
>> That didn't seem to work either. I'm trying to view a xy plot.
>>
>> Justin
>>
>> On Mon, Feb 23, 2009 at 1:05 PM, Clinton Stimpson <clinton at elemtech.com<mailto:
>> clinton at elemtech.com>> wrote:
>>
>>
>> Maybe you're just missing a
>> renderer->ResetCamera();
>>
>> If you're just viewing an image, have a look at the image viewer
>> example in VTK/Examples/GUI/Qt/ImageViewer
>>
>> Clint
>>
>> Justin Giles wrote:
>>
>> Ok, I added a style to my interactor in the following way:
>>
>> //code
>> vtkRenderWindow *renderWindow = vtkRenderWindow::New();
>> renderWindow->SetSize(550, 450);
>> renderWindow->AddRenderer(renderer);
>> vtkRenderWindowInteractor* inter = QVTKInteractor::New();
>> renderWindow->SetInteractor(inter);
>> vtkInteractorStyleImage* interstyle =
>> vtkInteractorStyleImage::New();
>> inter->SetInteractorStyle(interstyle);
>> view->SetRenderWindow(renderWindow);
>> //end code
>>
>> (where view = QVTKWidget)
>>
>> And, I still get the same results. Instead of a nice plot, I
>> just get a blank white screen. Thoughts? Am I doing something
>> wrong?
>>
>> Thanks,
>>
>> Justin
>>
>> On Mon, Feb 23, 2009 at 11:20 AM, Clinton Stimpson
>> <clinton at elemtech.com <mailto:clinton at elemtech.com>
>> <mailto:clinton at elemtech.com <mailto:clinton at elemtech.com>>>
>> wrote:
>>
>>
>> Interaction is handled by the interactor style classes.
>>
>> http://www.vtk.org/doc/nightly/html/classvtkInteractorStyle.html
>>
>> You can use an existing style, or make your own and give it
>> to the
>> interactor.
>>
>> Clint
>>
>> Justin Giles wrote:
>>
>> I am able to create a 2d plot using a QVTKWidget, however
>> I am
>> unable to interact with that plot. I pretty much new to
>> VTK,
>> so I am kind of at a loss as to how to connect the vtk
>> interactors and Qt. I have poked around a bit and noticed a
>> QVTKInteractor class, but anything I do with that results in
>> my 2d plot going away to be replaced with a blank white
>> area.
>> Below is the code that I am using. Just as a note, this is
>> being done in a class that extends a QMainWindow.
>>
>> //snippet//
>>
>>
>> view = new QVTKWidget;
>> setCentralWidget(view);
>>
>> int DIM = 500;
>> vtkDataArray *dataArray1 =
>> vtkDataArray::CreateDataArray(VTK_FLOAT);
>> dataArray1->SetNumberOfTuples(DIM);
>>
>> vtkDataArray *dataArray2 =
>> vtkDataArray::CreateDataArray(VTK_FLOAT);
>> dataArray2->SetNumberOfTuples(DIM);
>>
>> int t;
>> for (t = 0; t < DIM; t++)
>> {
>> float x = t;
>> float y = vtkMath::Random(0.0f,1.0f);
>> dataArray1->SetTuple(t, &x);
>> dataArray2->SetTuple(t, &y);
>> }
>>
>> vtkFieldData *fieldData = vtkFieldData::New();
>> fieldData->AllocateArrays(2);
>> fieldData->AddArray(dataArray1);
>> fieldData->AddArray(dataArray2);
>>
>> vtkDataObject *dataObject = vtkDataObject::New();
>> dataObject->SetFieldData(fieldData);
>>
>> vtkXYPlotActor *plot = vtkXYPlotActor::New();
>> plot->AddDataObjectInput(dataObject);
>> plot->SetTitle("Plot");
>> plot->SetXTitle("X-Axis");
>> plot->SetYTitle("Y-Axis");
>> plot->SetXValuesToValue();
>> plot->SetWidth(0.9);
>> plot->SetHeight(0.9);
>> plot->SetPosition(0.05, 0.05);
>> plot->LegendOn();
>> plot->PickableOff();
>> plot->PlotCurvePointsOn();
>> plot->PlotCurveLinesOff();
>>
>> plot->SetDataObjectXComponent(0, 0);
>> plot->SetDataObjectYComponent(0, 1);
>> plot->SetPlotColor(0, 1.0, 0.0, 0.0);
>> plot->SetPlotLabel(0, "My Label");
>> //plot->GetProperty()->SetColor(0.0, 0.0, 0.0);
>>
>> vtkRenderer *renderer = vtkRenderer::New();
>> renderer->SetBackground(0, 0, 0);
>> renderer->AddActor2D(plot);
>>
>> vtkRenderWindow *renderWindow = vtkRenderWindow::New();
>> renderWindow->SetSize(550, 450);
>> renderWindow->AddRenderer(renderer);
>> // vtkRenderWindowInteractor* inter =
>> QVTKInteractor::New();
>> // renderWindow->SetInteractor(inter);
>> view->SetRenderWindow(renderWindow);
>>
>> //end-snippet//
>>
>> ------------------------------------------------------------------------
>>
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