[vtkusers] render color vectos overlaping original image, the given pictur is unwanted result

[甘建红]

Hi all,
 
       I have 2 scalar images u and v, and compose a new image with vector pixel. My goal is render the composed vectors overlap original imge, but all vectors image show at the window center and shrinked, and the original image appear left-down corner of the same window as show in the picture. the problem has impede me.  any help will be appreciated and thanks for all in advance.
 
 
 
====I holpe the colorful vectors overlape on the image located at left-buttom corner====
 
The related program is given as following.
 
 
 
typedef itk::Vector<float,3> VectorPixelType; ////////////////////////////////////
 
typedef itk::Image<VectorPixelType,2> VectorImage2DType;
 
 
 
//  compose  a  image with vector pixel with two scalar images u and v
 
typedef itk::ComposeImageFilter<Image2DfType,VectorImage2DType> ImageToVectorImageFilterType;
 
ImageToVectorImageFilterType::Pointer imageToVectorImageFilter=ImageToVectorImageFilterType::New();
 
imageToVectorImageFilter->SetInput(0,u);
 
imageToVectorImageFilter->SetInput(1,v);
 
imageToVectorImageFilter->SetInput(2,v);
 
imageToVectorImageFilter->Update();
 
 
 
// convert the image with vector pixel to vtk image
 
ExportFilterType::Pointer itkExporter=ExportFilterType::New();
 
itkExporter->SetInput(imageToVectorImageFilter->GetOutput());
 
itkExporter->Update();
 
ConnectPipelines(itkExporter,vtkImporter);
 
vtkImporter->Update();  
 
 
 
// compute vector magnitude and add it to vtkImporter by AddArray function.
 
vtkSmartPointer<vtkImageMagnitude> magnitudeFilter=vtkSmartPointer<vtkImageMagnitude>::New();
 
magnitudeFilter->SetInputConnection(vtkImporter->GetOutput()->GetProducerPort());
 
magnitudeFilter->Update();
 
magnitudeFilter->GetOutput()->GetPointData()->GetScalars()->SetName("ColorValue");  
 
magnitudeFilter ->Update();
 
vtkImporter->GetOutput()->GetPointData()->AddArray(magnitudeFilter->GetOutput()->GetPointData()->GetScalars());
 
 
 
vtkSmartPointer<vtkMaskPoints> maskP=vtkSmartPointer<vtkMaskPoints>::New();
 
maskP->SetOnRatio(250);
 
maskP->RandomModeOff();
 
maskP->SetInputConnection(vtkImporter->GetOutputPort());         
 
maskP->Update(); /////////////
 
maskP->GetOutput()->GetPointData()->SetActiveVectors(vectorname.c_str());
 
 
 
vtkSmartPointer<vtkGlyphSource2D> arrowSource =vtkSmartPointer<vtkGlyphSource2D>::New();
 
arrowSource->SetGlyphTypeToArrow();         
 
arrowSource->SetScale2(1);
 
arrowSource->FilledOff();
 
arrowSource->CrossOff();
 
arrowSource->Update();
 
 
 
vtkSmartPointer<vtkGlyph2D> glyphFilter = vtkSmartPointer<vtkGlyph2D>::New();
 
glyphFilter->SetSourceConnection(arrowSource->GetOutputPort());
 
glyphFilter->OrientOn();
 
glyphFilter->SetScaleModeToScaleByScalar(); // 2013.11.30 22:50
 
glyphFilter->SetColorModeToColorByScalar(); 
 
glyphFilter->SetScaleFactor(10);
 
glyphFilter->SetInputConnection(maskP->GetOutputPort());
 
glyphFilter->Update();
 
vtkSmartPointer<vtkImageSliceMapper> imageMapper = vtkSmartPointer<vtkImageSliceMapper>::New();
 
imageMapper->SetInputConnection(vtkImporter->GetOutput()->GetProducerPort());
 
vtkSmartPointer<vtkLookupTable> Lut=vtkSmartPointer<vtkLookupTable>::New();
 
Lut->SetTableRange(-20,20);
 
Lut->SetHueRange(0,1);
 
Lut->SetSaturationRange(1,1);
 
Lut->SetValueRange(1,1);  //////////
 
Lut->SetAlpha(1);       
 
Lut->SetValueRange(-20,60);
 
Lut->SetNumberOfTableValues(25600);
 
Lut->SetRange(-20,60);
 
Lut->Build();
 
 
 
vtkSmartPointer<vtkImageSlice> imageSlice = vtkSmartPointer<vtkImageSlice>::New();
 
imageSlice->SetMapper(imageMapper);
 
 
 
vtkSmartPointer<vtkPolyDataMapper> vectorMapper = vtkSmartPointer<vtkPolyDataMapper>::New();
 
vectorMapper->SetInputConnection(glyphFilter->GetOutputPort());
 
vectorMapper->SetScalarRange(-20,20);
 
vectorMapper->ScalarVisibilityOn(); 
 
vectorMapper->SetLookupTable(Lut);
 
vectorMapper->SetScalarModeToUsePointFieldData();
 
vectorMapper->ColorByArrayComponent("ColorValue",3);
 
vectorMapper->SetColorModeToMapScalars();
 
vectorMapper->SelectColorArray("ColorValue");
 
vectorMapper->UseLookupTableScalarRangeOn();        
 
vectorMapper->ScalarVisibilityOn();
 
 
 
vtkSmartPointer<vtkActor> vectorActor = vtkSmartPointer<vtkActor>::New();
 
vectorActor->SetMapper(vectorMapper);
 
this->GetRenderer()->AddActor(vectorActor);
 
this->GetRenderer()->ResetCamera();
 
GetInteractor()->Render();        
 
this->GetRenderer()->Render();   
 
this->Invalidate(false);
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