[vtkusers] how can I scale a vtkActor2D?

[Liang Ma]

Hi Peter,

I tried, still can not scale the actor. I also tried vtkShrinkPolydata to 
scale the poly data before mapper. Not succeed. I think maybe use a 
vtkTransform to scale the data before map it is a possible way.
Thanks.

Regards

Liang Ma

----- Original Message ----- 
From: "Peter F Bradshaw" <pfb at exadios.com>
To: "VTK users" <vtkusers at vtk.org>
Sent: Wednesday, November 26, 2008 7:25 PM
Subject: Re: [vtkusers] how can I scale a vtkActor2D?


> Hi Liang Ma;
>
> You may need to set the camera into parallel projection mode.
>
> On Wed, 26 Nov 2008, Liang Ma wrote:
>
>> Sorry, still not clear last time.
>>
>>
>> // remove old actors
>>     this->pvtkRenderer->RemoveActor(this->pvtkActor);
>>     this->pvtkRenderer->RemoveActor(this->pvtkActor2D);
>>
>>     // read new data of 3D model from a STL file
>>     if (!this->pvtkSTLReader)
>>       this->pvtkSTLReader = vtkSTLReader::New();
>>     this->pvtkSTLReader->SetFileName(cFileDialog.GetPathName());
>>
>>  //Cut the 3D model
>>     m_VTKPD_data = pvtkSTLReader->GetOutput();
>>     m_VTKPD_data->Update();
>>     m_dOrigin1 = m_VTKPD_data->GetCenter();
>>     this->cplane->SetOrigin(m_dOrigin1[0], m_dOrigin1[1], m_dOrigin1[2]);
>>     float normal_x = 0;
>>     float normal_y = 0;
>>     float normal_z = 1;
>>     cplane->SetNormal(normal_x, normal_y, normal_z);
>>
>>     planeCut->SetInput(m_VTKPD_data);
>>     planeCut->SetCutFunction(cplane);
>>
>> // Setmapper
>>  this->pvtkDataSetMapper->SetInput(planeCut->GetOutput());
>>  this->pvtkActor->SetMapper(this->pvtkDataSetMapper);
>>
>> // Try to scale the 2D actor
>> 
>> this->pvtkActor->GetPositionCoordinate()->SetCoordinateSystemToNormalizedViewport();
>>       this->pvtkActor->GetPositionCoordinate()->SetValue(0.3, 0.5);
>>        this->pvtkActor->GetPosition2Coordinate()->SetValue(0.9, 0.9);
>>        this->pvtkActor->GetProperty()->SetColor(1, 0, 0);
>>
>> // Add the txt of thefile name
>>      this->pvtkTextMapper->SetInput(pvtkSTLReader->GetFileName());
>>       this->pvtkTextMapper->GetTextProperty()->SetFontSize(12);
>>      this->pvtkActor2D->SetMapper(this->pvtkTextMapper);
>>
>> // Set background and add actors to render
>> this->pvtkRenderer->SetBackground(0.4,0.4,0.4);
>>         this->pvtkRenderer->AddActor(this->pvtkActor);
>>        this->pvtkRenderer->AddActor(this->pvtkActor2D);
>>
>>     // try to zoom, then render
>>       this->pvtkRenderer->GetActiveCamera()->Zoom(5);
>>       this->pvtkRenderer->GetRenderWindow()->Render();
>
> Try:
>      this->pvtkRenderer->GetActiveCamera()->ParallelProjectionOn();
>      this->pvtkRenderer->GetActiveCamera()->Zoom(5);
>      this->pvtkRenderer->GetRenderWindow()->Render();
>
> Cheers
>
> -- 
> Peter F Bradshaw: http://www.exadios.com (public keys avaliable there).
> Personal site: http://personal.exadios.com
> "I love truth, and the way the government still uses it occasionally to
> keep us guessing." - Sam Kekovich.
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