itkcenteredaffinetransformtest.cxx

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/*=========================================================================

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkCenteredAffineTransformTest.cxx,v $
  Language:  C++
  Date:      $Date: 2008-06-29 13:13:37 $
  Version:   $Revision: 1.12 $

  Copyright (c) Insight Software Consortium. All rights reserved.
  See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even 
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR 
     PURPOSE.  See the above copyright notices for more information.

=========================================================================*/
#if defined(_MSC_VER)
#pragma warning ( disable : 4786 )
#endif

#include <iostream>

#include "itkCenteredAffineTransform.h"
#include "itkImage.h"
#include "vnl/vnl_vector_fixed.h"

typedef  itk::Matrix<double,2,2>   MatrixType;
typedef  itk::Vector<double,2>     VectorType;

namespace
{
  
void PrintVector( const VectorType & v )
{
  for( unsigned int i=0; i<VectorType::Dimension; i++)
  {
    std::cout << v[i] << ", ";
  }
  std::cout << std::endl;
}
}


int itkCenteredAffineTransformTest(int, char *[])
{


    int any = 0;       // Any errors detected in testing?

    MatrixType                   matrix2;
    MatrixType                   inverse2;
    VectorType                   vector2;

    int i, j;

    /* FIXME: This code exercises most of the methods but doesn't
       actually check that the results are correct. */

    /* Create a 2D identity transformation and show its parameters */
    typedef itk::Point<double,6> ParametersType;
    typedef itk::Matrix<double,2,6> JacobianType;
    
    typedef itk::CenteredAffineTransform<double,2> Affine2DType;
    Affine2DType::Pointer id2 = Affine2DType::New();
    matrix2 = id2->GetMatrix();
    vector2 = id2->GetOffset();
    std::cout << "Matrix from instantiating an identity transform:"
              << std::endl << matrix2;
    std::cout << "Vector from instantiating an identity transform:"
              << std::endl;
    PrintVector( vector2 );
    
    /* Create and show a simple 2D transform from given parameters */
    matrix2[0][0] = 1;
    matrix2[0][1] = 2;
    matrix2[1][0] = 3;
    matrix2[1][1] = 4;
    vector2[0] = 5;
    vector2[1] = 6;

    Affine2DType::Pointer aff2 = Affine2DType::New();
    aff2->SetMatrix( matrix2 );
    aff2->SetOffset( vector2 );
    for (i = 0; i < 2; i++) {
        for (j = 0; j < 2; j++)
            matrix2[i][j] = 0.0;
        vector2[i]    = 0.0;
    }
    std::cout << "Instantiation of a given 2D transform:" << std::endl;
    aff2->Print( std::cout );

    inverse2 = aff2->GetInverseMatrix();
    std::cout << "Inverse matrix for the given transform:"
              << std::endl << inverse2;

    /* Set parameters of a 2D transform */
    matrix2[0][0] = 6;
    matrix2[0][1] = 5;
    matrix2[1][0] = 4;
    matrix2[1][1] = 3;
    vector2[0] = 2;
    vector2[1] = 1;
    aff2->SetMatrix(matrix2);
    aff2->SetOffset(vector2);
    for (i = 0; i < 2; i++) {
        for (j = 0; j < 2; j++)
            matrix2[i][j] = 0.0;
        vector2[i]    = 0.0;
    }
    matrix2 = aff2->GetMatrix();
    vector2 = aff2->GetOffset();
    std::cout << "Setting the matrix in an existing transform:"
              << std::endl << matrix2;
    std::cout << "Setting the offset in an existing  transform:"
              << std::endl;
    PrintVector( vector2 );


    /* Try composition of two transformations */
    aff2->Compose( aff2 );
    std::cout << "Result of a composition:" << std::endl;
    aff2->Print( std::cout );

    /* Compose with a translation */
    VectorType trans;
    trans[0] = 1;
    trans[1] = 2;
    aff2->Translate(trans);
    std::cout << "Result of a translation:" << std::endl;
    aff2->Print( std::cout );

    /* Compose with an isotropic scaling */
    aff2->Scale(.3, 1);
    std::cout << "Result of isotropic scaling:" << std::endl;
    aff2->Print( std::cout );

    /* Compose with an anisotropic scaling */
    VectorType scale;
    scale[0] = .3;
    scale[1] = .2;
    aff2->Scale(scale);
    std::cout << "Result of anisotropic scaling:" << std::endl;
    aff2->Print( std::cout );

    /* Compose with a general N-D rotation */
    aff2->Rotate(0, 1, 0.57, 1);
    std::cout << "Result of general rotation:" << std::endl;
    aff2->Print( std::cout );

    /* Compose with a 2-D rotation */
    aff2->Rotate(0, 1, -0.57, 1);
    std::cout << "Result of 2-D rotation:" << std::endl;
    aff2->Print( std::cout );

    /* Compose with a shear */
    aff2->Shear(1, 0, .2);
    std::cout << "Result of shear:" << std::endl;
    aff2->Print( std::cout );

    /* Transform a point */
    itk::Point<double, 2> u2, v2;
    u2[0] = 3;
    u2[1] = 5;
    v2 = aff2->TransformPoint(u2);
    std::cout << "Transform a point:" << std::endl
              << v2[0] << " , " << v2[1] << std::endl;

    ///* Back transform a point */
    //v2 = aff2->BackTransform(u2);
    //std::cout << "Back transform a point:" << std::endl
              //<< v2[0] << " , " << v2[1] << std::endl;

    /* Transform a vnl_vector */
    vnl_vector_fixed<double, 2> x2, y2;
    x2[0] = 1;
    x2[1] = 2;
    y2 = aff2->TransformVector(x2);
    std::cout << "Transform a vnl_vector:" << std::endl
              << y2[0] << " , " << y2[1] << std::endl;

    ///* Back transform a vector */
    //y2 = aff2->BackTransform(x2);
    //std::cout << "Back transform a vnl_vector:" << std::endl
              //<< y2[0] << " , " << y2[1] << std::endl;

    /* Transform a vector */
    itk::Vector<double, 2> u3, v3;
    u3[0] = 3;
    u3[1] = 5;
    v3 = aff2->TransformVector(u3);
    std::cout << "Transform a vector:" << std::endl
              << v3[0] << " , " << v3[1] << std::endl;

    ///* Back transform a vector */
    //v3 = aff2->BackTransform(u3);
    //std::cout << "Back transform a vector :" << std::endl
              //<< v3[0] << " , " << v3[1] << std::endl;

    /* Transform a Covariant vector */
    itk::Vector<double, 2> u4, v4;
    u4[0] = 3;
    u4[1] = 5;
    v4 = aff2->TransformVector(u4);
    std::cout << "Transform a Covariant vector:" << std::endl
              << v4[0] << " , " << v4[1] << std::endl;

    ///* Back transform a vector */
    //v4 = aff2->BackTransform(u4);
    //std::cout << "Back transform a vector :" << std::endl
              //<< v4[0] << " , " << v4[1] << std::endl;



    /* Create a 3D transform and rotate in 3D */
    typedef itk::CenteredAffineTransform<double,3> Affine3DType;
    Affine3DType::Pointer aff3 = Affine3DType::New();
    itk::Vector<double,3> axis;
    axis[0] = .707;
    axis[1] = .707;
    axis[2] = .707;
    aff3->Rotate3D(axis, 1.0, 1);
    std::cout << "Create and rotate a 3D transform:" << std::endl;
    aff3->Print( std::cout );

    /* Generate inverse transform */
    Affine3DType::Pointer inv3 = Affine3DType::New();
    if(!aff3->GetInverse(inv3))
      {
      std::cout << "Cannot create inverse transformation" << std::endl;
      }
    std::cout << "Create an inverse transformation:" << std::endl;
    inv3->Print( std::cout );


    /* Create an image for testing index<->physical transforms */
    std::cout << "Creating image for testing index<->physical transforms"
              << std::endl;
    double spacing[3] = {1.0, 2.0, 3.0};
    double origin [3] = {4.0, 5.0, 6.0};
    itk::Image<unsigned char, 3>::Pointer
        image =itk::Image<unsigned char, 3>::New();
    image->SetOrigin (origin);
    image->SetSpacing(spacing);


    /* Test output of GetJacobian */
    Affine3DType::Pointer jaff = Affine3DType::New();
    Affine3DType::MatrixType jaffMatrix = jaff->GetMatrix();
    Affine3DType::OffsetType jaffVector = jaff->GetOffset();

    Affine3DType::InputPointType jpoint;
    jpoint[0] = 5.0;
    jpoint[1] = 10.0;
    jpoint[2] = 15.0; 
    Affine3DType::JacobianType jaffJacobian = jaff->GetJacobian( jpoint );

    std::cout << "GetJacobian: " << std::endl;
    std::cout << jaffJacobian << std::endl;
    
    /* Get the parameters */
    Affine3DType::ParametersType parameters3D;
    parameters3D = aff3->GetParameters();

    std::cout << "Parameters 3D: " << parameters3D << std::endl;

    /* Now set the parameters of another matrix */
    jaff->SetParameters(parameters3D);

    std::cout << "A transform after SetParameters:" << std::endl;
    jaff->Print( std::cout );

    return any;
}