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/*=========================================================================
Program: Visualization Toolkit
Module: TestPlane.cxx
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or http://www.kitware.com/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 notice for more information.
=========================================================================*/
#include "vtkFloatArray.h"
#include "vtkMath.h"
#include "vtkMathUtilities.h"
#include "vtkNew.h"
#include "vtkPlane.h"
#include "vtkPoints.h"
#include "vtkSmartPointer.h"
#include <limits>
#ifndef ABS
#define ABS(x) ((x) < 0 ? -(x) : (x))
#endif
template <class A>
bool fuzzyCompare1D(A a, A b)
{
return ABS(a - b) < std::numeric_limits<A>::epsilon();
}
template <class A>
bool fuzzyCompare3D(A a[3], A b[3])
{
return fuzzyCompare1D(a[0], b[0]) && fuzzyCompare1D(a[1], b[1]) && fuzzyCompare1D(a[2], b[2]);
}
int TestPlane(int, char*[])
{
// Test ProjectVector (vector is out of plane)
{
vtkSmartPointer<vtkPlane> plane = vtkSmartPointer<vtkPlane>::New();
plane->SetOrigin(0.0, 0.0, 0.0);
plane->SetNormal(0, 0, 1);
std::cout << "Testing ProjectVector" << std::endl;
double v[3] = { 1, 2, 3 };
double projection[3];
double correct[3] = { 1., 2., 0 };
plane->ProjectVector(v, projection);
if (!fuzzyCompare3D(projection, correct))
{
std::cerr << "ProjectVector failed! Should be (1., 2., 0) but it is (" << projection[0] << " "
<< projection[1] << " " << projection[2] << ")" << std::endl;
return EXIT_FAILURE;
}
}
// Test ProjectVector where vector is already in plane
{
vtkSmartPointer<vtkPlane> plane = vtkSmartPointer<vtkPlane>::New();
plane->SetOrigin(0.0, 0.0, 0.0);
plane->SetNormal(0, 0, 1);
std::cout << "Testing ProjectVector" << std::endl;
double v[3] = { 1, 2, 0 };
double projection[3];
double correct[3] = { 1., 2., 0 };
plane->ProjectVector(v, projection);
if (!fuzzyCompare3D(projection, correct))
{
std::cerr << "ProjectVector failed! Should be (1., 2., 0) but it is (" << projection[0] << " "
<< projection[1] << " " << projection[2] << ")" << std::endl;
return EXIT_FAILURE;
}
}
// Test ProjectVector where vector is orthogonal to plane
{
vtkSmartPointer<vtkPlane> plane = vtkSmartPointer<vtkPlane>::New();
plane->SetOrigin(0.0, 0.0, 0.0);
plane->SetNormal(0, 0, 1);
std::cout << "Testing ProjectVector" << std::endl;
double v[3] = { 0, 0, 1 };
double projection[3];
double correct[3] = { 0., 0., 0. };
plane->ProjectVector(v, projection);
if (!fuzzyCompare3D(projection, correct))
{
std::cerr << "ProjectVector failed! Should be (0., 0., 0) but it is (" << projection[0] << " "
<< projection[1] << " " << projection[2] << ")" << std::endl;
return EXIT_FAILURE;
}
}
{
vtkNew<vtkPlane> plane;
plane->SetOrigin(0.0, 0.0, 0.0);
plane->SetNormal(0.0, 0.0, 1.0);
vtkIdType nPointsPerDimension = 11;
vtkIdType nPoints = std::pow(nPointsPerDimension, 3);
vtkNew<vtkPoints> points;
points->SetNumberOfPoints(nPoints);
// Generate a grid of points
float in[3];
float minX = -1.0f, minY = -1.0f, minZ = -1.0f;
float increment = 2.0f / (static_cast<float>(nPointsPerDimension) - 1.0f);
vtkIdType pos = 0;
for (int z = 0; z < nPointsPerDimension; ++z)
{
in[2] = minZ + static_cast<float>(z) * increment;
for (int y = 0; y < nPointsPerDimension; ++y)
{
in[1] = minY + static_cast<float>(y) * increment;
for (int x = 0; x < nPointsPerDimension; ++x)
{
in[0] = minX + static_cast<float>(x) * increment;
points->SetPoint(pos++, in);
}
}
}
assert(pos == nPoints);
vtkFloatArray* input = vtkArrayDownCast<vtkFloatArray>(points->GetData());
vtkNew<vtkFloatArray> arrayOutput;
arrayOutput->SetNumberOfComponents(1);
arrayOutput->SetNumberOfTuples(nPoints);
std::cout << "Testing FunctionValue:\n";
// calculate function values with the vtkDataArray interface
plane->FunctionValue(input, arrayOutput);
// Calculate the same points using a loop over points.
vtkNew<vtkFloatArray> loopOutput;
loopOutput->SetNumberOfComponents(1);
loopOutput->SetNumberOfTuples(nPoints);
for (vtkIdType pt = 0; pt < nPoints; ++pt)
{
double x[3];
x[0] = input->GetTypedComponent(pt, 0);
x[1] = input->GetTypedComponent(pt, 1);
x[2] = input->GetTypedComponent(pt, 2);
loopOutput->SetTypedComponent(pt, 0, plane->FunctionValue(x));
}
for (vtkIdType i = 0; i < nPoints; ++i)
{
if (!vtkMathUtilities::FuzzyCompare(
arrayOutput->GetTypedComponent(i, 0), loopOutput->GetTypedComponent(i, 0)))
{
std::cerr << "Array and point interfaces returning different results at index " << i << ": "
<< arrayOutput->GetTypedComponent(i, 0) << " vs "
<< loopOutput->GetTypedComponent(i, 0) << '\n';
return EXIT_FAILURE;
}
}
}
return EXIT_SUCCESS;
}
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