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/*=========================================================================
Program: Visualization Toolkit
Module: TestPiecewiseFunctionLogScale.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 "vtkPiecewiseFunction.h"
#include "vtkNew.h"
#include <cmath>
// Note that this may evaluate args twice. Use wisely.
#define TEST_ASSERT_FUZZY_EQUAL(expect, actual) \
do \
{ \
if (std::fabs((expect) - (actual)) >= 1e-5) \
{ \
std::cerr << "Error at line " << __LINE__ << ": Expected value " << (expect) << ", got " \
<< (actual) << "\n"; \
return EXIT_FAILURE; \
} \
} while (false)
int TestPiecewiseFunctionLogScale(int, char*[])
{
vtkNew<vtkPiecewiseFunction> func;
func->UseLogScaleOn();
// Add some points that will give easily predictable interpolations.
func->AddPoint(.01, -2.);
func->AddPoint(-.01, -2.);
func->AddPoint(100., 2.);
func->AddPoint(-100., 2.);
// Check that the interpolations are correct in logarithmic space.
TEST_ASSERT_FUZZY_EQUAL(-1., func->GetValue(.1));
TEST_ASSERT_FUZZY_EQUAL(-1., func->GetValue(-.1));
TEST_ASSERT_FUZZY_EQUAL(0., func->GetValue(1.));
TEST_ASSERT_FUZZY_EQUAL(0., func->GetValue(-1.));
TEST_ASSERT_FUZZY_EQUAL(1., func->GetValue(10.));
TEST_ASSERT_FUZZY_EQUAL(1., func->GetValue(-10.));
return EXIT_SUCCESS;
}
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