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/*=========================================================================
*
* Copyright Insight Software Consortium
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0.txt
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*=========================================================================*/
#include "itkFiniteCylinderSpatialFunction.h"
int itkFiniteCylinderSpatialFunctionTest(int, char* [] )
{
std::cout << "itkFiniteCylinderSpatialFunction test start" << std::endl;
// Test will create a cylinder (3 - dimensional)
const unsigned int dimension = 3;
// Cylinder spatial function typedef.
typedef itk::FiniteCylinderSpatialFunction<dimension> TCylinderFunctionType;
typedef TCylinderFunctionType::InputType TCylinderFunctionVectorType;
//cylinder
TCylinderFunctionType::Pointer spatialFunc = TCylinderFunctionType::New();
double axis = 40.0;
spatialFunc->SetAxisLength(axis);
// Define function, which encapsulates cylinder.
int xExtent = 50;
int yExtent = 50;
int zExtent = 50;
TCylinderFunctionVectorType center;
center[0] = xExtent/2;
center[1] = yExtent/2;
center[2] = zExtent/2;
spatialFunc->SetCenter(center);
TCylinderFunctionVectorType orientation;
orientation[0] = .35;
orientation[1] = .35;
orientation[2] = .30;
spatialFunc->SetOrientation(orientation);
double radius = 5.0;
spatialFunc->SetRadius(radius);
// Evaluate all points in the spatial function and count the number of
// pixels that are inside the cylinder.
double testPosition[dimension]; // position of a pixel
bool functionValue; // Value of pixel at a given position
int interiorPixelCounter = 0; // Count pixels inside cylinder
for(int x = 0; x < xExtent; x++)
{
for(int y = 0; y < yExtent; y++)
{
for(int z =0; z < zExtent; z++)
{
testPosition[0] = x;
testPosition[1] = y;
testPosition[2] = z;
functionValue = spatialFunc->Evaluate(testPosition);
if(functionValue == 1)
interiorPixelCounter ++;
}
}
}
// Evaluate the center of the ellipsoid, which is inside the ellipsoid and
// should equal 1.
testPosition[0] = center[0];
testPosition[1] = center[1];
testPosition[2] = center[2];
functionValue = spatialFunc->Evaluate(testPosition);
// Volume of cylinder using V=pi*r^2*h
double volume = 3.14159*pow(radius,2)*axis;
// Percent difference in volume measurement and calculation
double volumeError = (std::fabs(volume - interiorPixelCounter)/volume)*100;
std::cout << spatialFunc;
// 5% error was randomly chosen as a successful ellipsoid fill.
// This should actually be some function of the image/ellipsoid size.
if(volumeError <= 7.0 && functionValue == 1)
{
// With testing settings, results should yield:
// calculated ellipsoid volume = 12566.4 pixels
// measured ellipsoid volume = 12428 pixels
// volume error = 1.10907%
// function value = 1
std::cout << "calculated cylinder volume = " << volume << std::endl
<< "measured cylinder volume = " << interiorPixelCounter << std::endl
<< "volume error = " << volumeError << "%" << std::endl
<< "function value = " << functionValue << std::endl
<< "center location = (" << spatialFunc->GetCenter()[0] << ", " << spatialFunc->GetCenter()[0]
<< ", " << spatialFunc->GetCenter()[2] << ")" << std::endl
<< "axis length = " << axis << std::endl
<< "itkFiniteCylinderSpatialFunction test ended successfully!" << std::endl;
return EXIT_SUCCESS;
}
//Default is to produce error code
std::cerr << "calculated ellipsoid volume = " << volume << std::endl
<< "measured ellipsoid volume = " << interiorPixelCounter << std::endl
<< "volume error = " << volumeError << "%" << std::endl
<< "function value = " << functionValue << std::endl
<< "center location = (" << spatialFunc->GetCenter()[0] << ", " << spatialFunc->GetCenter()[0]
<< ", " << spatialFunc->GetCenter()[2] << ")" << std::endl
<< "axis length = " << axis << std::endl
<< "itkFiniteCylinderSpatialFunction test failed :(" << std::endl;
return EXIT_FAILURE;
}
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