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// BeginLatex
//
// This example illustrates how to use xml readers to load precomputed
// transformations. These are either tool calibrations or results of pre-operative
// registration (e.g. MR/CT). The program recieves an xml file containing a precomputed
// transformation, reads it, presents the user with the general information
// about the transformation (when computed and estimation error). The user is
// then asked if they wish to use the transformation or not. If the answer is yes, the
// program prints the transformation and exits, otherwise it just exits.
//
// To use the xml readers and the precomputed transform data type we need to
// include the following files:
//
// EndLatex
// BeginCodeSnippet
#include "igstkPrecomputedTransformData.h"
#include "igstkTransformFileReader.h"
#include "igstkPerspectiveTransformXMLFileReader.h"
#include "igstkAffineTransformXMLFileReader.h"
#include "igstkRigidTransformXMLFileReader.h"
// EndCodeSnippet
/**
* This object observes the event generated when a RequestGetData() method of
* the reader is invoked, gets the precomputed transform data object.
*/
igstkObserverMacro( TransformData,
igstk::TransformFileReader::TransformDataEvent,
igstk::PrecomputedTransformData::Pointer )
igstkObserverMacro( TransformationDescription,
igstk::StringEvent,
std::string )
igstkObserverMacro( TransformationDate,
igstk::PrecomputedTransformData::TransformDateTypeEvent,
std::string )
typedef igstk::PrecomputedTransformData::TransformType * TransformTypePointer;
igstkObserverMacro( TransformRequest,
igstk::PrecomputedTransformData::TransformTypeEvent,
TransformTypePointer )
igstkObserverMacro( TransformError,
igstk::PrecomputedTransformData::TransformErrorTypeEvent,
igstk::PrecomputedTransformData::ErrorType )
/**
* This program recieves an xml file containing a precomputed
* transformation, reads it, presents the user with the general information
* about the transformation (when computed and estimation error). The user is
* then asked if to use the transformation or not. If the answer is yes, the
* program prints the transformation and exits, otherwise it just exits.
*
*/
int main(int argc, char *argv[])
{
const unsigned int NUM_TRANSFORM_TYPES = 3;
std::string transformTypes[NUM_TRANSFORM_TYPES];
enum { RIGID_TRANSFORM, AFFINE_TRANSFORM, PERSPECTIVE_TRANSFORM };
transformTypes[RIGID_TRANSFORM] = "rigid";
transformTypes[AFFINE_TRANSFORM] = "affine";
transformTypes[PERSPECTIVE_TRANSFORM] = "perspective";
if( argc!= 3 )
{
std::cerr<<"Wrong number of arguments.\n";
std::cerr<<"Usage: "<<argv[0]<<" transformation_type ";
std::cerr<<"transformation_data_file_name\n";
std::cerr<<"Transformation types:\n";
for( unsigned int i=0; i<NUM_TRANSFORM_TYPES; i++ )
std::cerr<<"\t"<<i<<" == "<<transformTypes[i]<<"\n";
return EXIT_FAILURE;
}
igstk::PrecomputedTransformData::Pointer transformData;
//our reader
// BeginLatex
//
// Instantiate the transformation file reader which is parameterized
// using the xml reader corresponding to the relevant transformation type.
//
// EndLatex
// BeginCodeSnippet
igstk::TransformFileReader::Pointer transformFileReader =
igstk::TransformFileReader::New();
// EndCodeSnippet
//set our reader to read a rigid transformation from the
//given file
igstk::TransformXMLFileReaderBase::Pointer xmlFileReader;
//assumes the second argument is an integer, not checking for junk input
switch( atoi( argv[1] ) )
{
case RIGID_TRANSFORM:
// BeginLatex
//
// We are interested in a rigid transformation, so instantiate that xml
// reader.
//
// EndLatex
// BeginCodeSnippet
xmlFileReader = igstk::RigidTransformXMLFileReader::New();
// EndCodeSnippet
break;
case AFFINE_TRANSFORM:
xmlFileReader = igstk::AffineTransformXMLFileReader::New();
break;
case PERSPECTIVE_TRANSFORM:
xmlFileReader = igstk::PerspectiveTransformXMLFileReader::New();
break;
default:
std::cerr<<"Given transfromation type ("<<argv[1]<<") is invalid.\n";
std::cerr<<"Transformation types:\n";
for( unsigned int i=0; i<NUM_TRANSFORM_TYPES; i++ )
std::cerr<<"\t"<<i<<" == "<<transformTypes[i]<<"\n";
return EXIT_FAILURE;
}
// BeginLatex
//
// Set the reader and the name of the file we want to read.
//
// EndLatex
// BeginCodeSnippet
transformFileReader->RequestSetReader( xmlFileReader );
transformFileReader->RequestSetFileName( argv[2] );
// EndCodeSnippet
//observer for the read success and failure events
igstk::TransformFileReader::ReadObserver::Pointer readObserver =
igstk::TransformFileReader::ReadObserver::New();
//observer for the get data event (initiated by the readObserver)
TransformDataObserver::Pointer getDataObserver = TransformDataObserver::New();
//add our observers
transformFileReader->AddObserver(
igstk::TransformFileReader::ReadFailureEvent(),
readObserver );
transformFileReader->AddObserver(
igstk::TransformFileReader::ReadSuccessEvent(),
readObserver );
transformFileReader->AddObserver(
igstk::TransformFileReader::TransformDataEvent(),
getDataObserver );
//request read. if it fails the readObserver will print the
//error, otherwise it will request to get the transform data
// BeginLatex
//
// Try to read. The success or failure of this attempt are observed using
// the standard IGSTK observer-command approach.
//
// EndLatex
// BeginCodeSnippet
transformFileReader->RequestRead();
// EndCodeSnippet
if( readObserver->GotReadFailure() )
{
std::cerr<<readObserver->GetErrorMessage()<<"\n";
return EXIT_FAILURE;
}
//if the read succeeded it invoked a request data, so check if
//we got the data
if( getDataObserver->GotTransformData() )
{
transformData = getDataObserver->GetTransformData();
//attach all observers to the transformation data
//object
TransformationDescriptionObserver::Pointer descriptionObserver =
TransformationDescriptionObserver::New();
transformData->AddObserver( igstk::StringEvent(),
descriptionObserver );
TransformationDateObserver::Pointer dateObserver =
TransformationDateObserver::New();
transformData->AddObserver(
igstk::PrecomputedTransformData::TransformDateTypeEvent(),
dateObserver );
TransformRequestObserver::Pointer transformObserver =
TransformRequestObserver::New();
transformData->AddObserver(
igstk::PrecomputedTransformData::TransformTypeEvent(),
transformObserver );
TransformErrorObserver::Pointer transformErrorObserver =
TransformErrorObserver::New();
transformData->AddObserver(
igstk::PrecomputedTransformData::TransformErrorTypeEvent(),
transformErrorObserver );
//request all the info
transformData->RequestTransformDescription();
transformData->RequestComputationDateAndTime();
transformData->RequestEstimationError();
if( descriptionObserver->GotTransformationDescription() &&
dateObserver->GotTransformationDate() &&
transformErrorObserver->GotTransformError() )
{
char response;
std::cout<<descriptionObserver->GetTransformationDescription();
std::cout<<" ("<<dateObserver->GetTransformationDate()<<").\n";
std::cout<<"Estimation error: ";
std::cout<<transformErrorObserver->GetTransformError()<<"\n";
std::cout<<"Use this data [n,y]: ";
std::cin>>response;
//set the tool's calibration transform
if(response == 'y')
{
transformData->RequestTransform();
if( transformObserver->GotTransformRequest() )
{
std::cout<<"Set calibration:\n";
transformObserver->GetTransformRequest()->Print( std::cout,
itk::Indent() );
}
}
}
}
return EXIT_SUCCESS;
}
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