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126 lines
4.3 KiB
126 lines
4.3 KiB
/*=========================================================================
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Program: Visualization Toolkit
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Module: $RCSfile: vtkImageFlip.cxx,v $
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Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
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All rights reserved.
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See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
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This software is distributed WITHOUT ANY WARRANTY; without even
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the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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PURPOSE. See the above copyright notice for more information.
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=========================================================================*/
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#include "vtkImageFlip.h"
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#include "vtkImageData.h"
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#include "vtkInformation.h"
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#include "vtkInformationVector.h"
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#include "vtkMatrix4x4.h"
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#include "vtkObjectFactory.h"
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#include "vtkStreamingDemandDrivenPipeline.h"
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#include "vtkDataSetAttributes.h"
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vtkCxxRevisionMacro(vtkImageFlip, "$Revision: 1.40 $");
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vtkStandardNewMacro(vtkImageFlip);
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//----------------------------------------------------------------------------
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vtkImageFlip::vtkImageFlip()
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{
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this->PreserveImageExtent = 1;
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this->FlipAboutOrigin = 0;
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this->FilteredAxis = 0;
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if (!this->ResliceAxes)
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{
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// for consistent register/unregister
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this->SetResliceAxes(vtkMatrix4x4::New());
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this->ResliceAxes->Delete();
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}
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}
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//----------------------------------------------------------------------------
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int vtkImageFlip::RequestInformation(
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vtkInformation *vtkNotUsed(request),
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vtkInformationVector **inputVector,
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vtkInformationVector *outputVector)
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{
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double spacing[3];
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double origin[3];
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int wholeExt[6];
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vtkInformation *inInfo = inputVector[0]->GetInformationObject(0);
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vtkInformation *outInfo = outputVector->GetInformationObject(0);
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inInfo->Get(vtkStreamingDemandDrivenPipeline::WHOLE_EXTENT(), wholeExt);
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inInfo->Get(vtkDataObject::SPACING(), spacing);
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inInfo->Get(vtkDataObject::ORIGIN(), origin);
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int iflip = this->FilteredAxis;
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// changing the matrix elements directly is ugly, but if the matrix is
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// Modified then the MTime of the filter also changes, which would screw
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// up the pipeline
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if (this->ResliceAxes)
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{
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// set to identity
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for (int i = 0; i < 4; i++)
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{
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for (int j = 0; j < 4; j++)
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{
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this->ResliceAxes->Element[i][j] = 0.0;
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}
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this->ResliceAxes->Element[i][i] = 1.0;
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}
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// but with a iflip along one axis
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this->ResliceAxes->Element[iflip][iflip] = -1.0;
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}
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if (!this->FlipAboutOrigin)
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{
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// set ResliceAxesOrigin so the flip occurs around the correct axis such that
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// the Origin of the output data can be left the same as the Origin of the
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// input data
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if (this->ResliceAxes)
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{
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this->ResliceAxes->Element[iflip][3] = 2*origin[iflip] +
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spacing[iflip]*(wholeExt[2*iflip] + wholeExt[2*iflip+1]);
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}
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}
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else
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{
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// set the output Origin such that when the image flips about its origin
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// (meaning the real origin, not what vtkImageData calls "Origin") the
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// transformed output bounds exactly overlay the input bounds.
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origin[iflip] = - origin[iflip]
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- spacing[iflip]*(wholeExt[2*iflip] + wholeExt[2*iflip+1]);
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}
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outInfo->Set(vtkStreamingDemandDrivenPipeline::WHOLE_EXTENT(), wholeExt, 6);
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outInfo->Set(vtkDataObject::SPACING(), spacing, 3);
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outInfo->Set(vtkDataObject::ORIGIN(), origin, 3);
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// This information already copied from input to output in CopyInformationToPipeline?
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vtkInformation *inScalarInfo = vtkDataObject::GetActiveFieldInformation(inInfo,
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vtkDataObject::FIELD_ASSOCIATION_POINTS, vtkDataSetAttributes::SCALARS);
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if (!inScalarInfo)
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{
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vtkErrorMacro("Missing scalar field on input information!");
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return 0;
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}
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vtkDataObject::SetPointDataActiveScalarInfo(outInfo,
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inScalarInfo->Get( vtkDataObject::FIELD_ARRAY_TYPE() ),
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inScalarInfo->Get( vtkDataObject::FIELD_NUMBER_OF_COMPONENTS() ) );
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return 1;
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}
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//----------------------------------------------------------------------------
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void vtkImageFlip::PrintSelf(ostream& os, vtkIndent indent)
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{
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this->Superclass::PrintSelf(os,indent);
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os << indent << "FilteredAxis: " << this->FilteredAxis << "\n";
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os << indent << "FlipAboutOrigin: " << (this->FlipAboutOrigin ? "On\n" : "Off\n");
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os << indent << "PreserveImageExtent: " << (this->PreserveImageExtent ? "On\n" : "Off\n");
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}
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