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/*=========================================================================
Program: Visualization Toolkit
Module: TestLookupTable.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.
=========================================================================*/
// Test some generic features of vtkLookupTable
#include "vtkLookupTable.h"
#include "vtkMath.h"
#include "vtkMathUtilities.h"
#include "vtkCommand.h"
#include "vtkSmartPointer.h"
// simple macro for performing tests
#define TestAssert(t) \
if (!(t)) \
{ \
cerr << "In " << __FILE__ << ":"; \
cerr << " Test assertion failed line " << __LINE__ << ": " << #t << "\n"; \
rval |= 1; \
}
#define TestVector4d(t1, t2) \
TestAssert( \
(vtkMathUtilities::FuzzyCompare<double>(t1[0], t2[0]) \
&& vtkMathUtilities::FuzzyCompare<double>(t1[1], t2[1]) \
&& vtkMathUtilities::FuzzyCompare<double>(t1[2], t2[2]) \
&& vtkMathUtilities::FuzzyCompare<double>(t1[3], t2[3])))
int TestColor4uc(unsigned char* expected, unsigned char* test)
{
int failed = expected[0] != test[0] || expected[1] != test[1] ||
expected[2] != test[2] || expected[3] != test[3] ? 1 : 0;
if (failed)
{
std::cerr << "Expected color: " <<
static_cast<int>(expected[0]) << ", " <<
static_cast<int>(expected[1]) << ", " <<
static_cast<int>(expected[2]) << ", " <<
static_cast<int>(expected[3]) << std::endl;
std::cerr << "Test color: " <<
static_cast<int>(test[0]) << ", " <<
static_cast<int>(test[1]) << ", " <<
static_cast<int>(test[2]) << ", " <<
static_cast<int>(test[3]) << std::endl;
}
return !failed;
}
// a simple error observer
namespace {
class errorObserver
{
public:
errorObserver() : EventId(0) {}
void Reset() { this->EventId = 0; }
unsigned long GetEvent() const { return this->EventId; }
void Callback(vtkObject *, unsigned long e, void *) {
this->EventId = e; }
private:
unsigned long EventId;
};
}
int TestLookupTable(int,char *[])
{
int rval = 0;
vtkSmartPointer<vtkLookupTable> table =
vtkSmartPointer<vtkLookupTable>::New();
// == check computation of table index ==
// basic mapping test
double lo = 3.234;
double hi = 6.123;
double tol = 1e-6;
double step = (hi - lo)/255.0;
table->SetTableRange(lo,hi);
table->Build();
TestAssert(table->GetIndex(lo) == 0);
TestAssert(table->GetIndex(hi) == 255);
TestAssert(table->GetIndex(lo+tol) == 0);
TestAssert(table->GetIndex(hi-tol) == 255);
TestAssert(table->GetIndex(lo-step) == 0);
TestAssert(table->GetIndex(hi+step) == 255);
TestAssert(table->GetIndex(lo+step) == 1);
TestAssert(table->GetIndex(hi-step) == 254);
TestAssert(table->GetIndex(vtkMath::Nan()) == -1);
double rgba[4];
rgba[0] = 0.0; rgba[1] = 0.0; rgba[2] = 0.0; rgba[3] = 1.0;
TestVector4d(table->GetBelowRangeColor(), rgba);
rgba[0] = 1.0; rgba[1] = 1.0; rgba[2] = 1.0; rgba[3] = 1.0;
TestVector4d(table->GetAboveRangeColor(), rgba);
TestAssert(table->GetUseBelowRangeColor() == 0);
TestAssert(table->GetUseAboveRangeColor() == 0);
unsigned char expected[4], *result;
// Test handling of below-range colors
vtkMath::HSVToRGB(table->GetHueRange()[0],
table->GetSaturationRange()[0],
table->GetValueRange()[0],
&rgba[0], &rgba[1], &rgba[2]);
rgba[3] = table->GetAlphaRange()[0];
vtkLookupTable::GetColorAsUnsignedChars(rgba, expected);
table->UseBelowRangeColorOff();
table->Build();
result = table->MapValue(lo);
TestAssert(TestColor4uc(expected, result));
table->GetBelowRangeColor(rgba);
vtkLookupTable::GetColorAsUnsignedChars(rgba, expected);
table->UseBelowRangeColorOn();
table->Build();
result = table->MapValue(lo-tol);
TestAssert(TestColor4uc(expected, result));
// Test handling of above-range colors
vtkMath::HSVToRGB(table->GetHueRange()[1],
table->GetSaturationRange()[1],
table->GetValueRange()[1],
&rgba[0], &rgba[1], &rgba[2]);
rgba[3] = table->GetAlphaRange()[1];
vtkLookupTable::GetColorAsUnsignedChars(rgba, expected);
table->UseAboveRangeColorOff();
table->Build();
result = table->MapValue(hi);
TestAssert(TestColor4uc(expected, result));
table->GetAboveRangeColor(rgba);
vtkLookupTable::GetColorAsUnsignedChars(rgba, expected);
table->UseAboveRangeColorOn();
table->Build();
result = table->MapValue(hi+tol);
TestAssert(TestColor4uc(expected, result));
// log range test
lo = pow(10.0,lo);
hi = pow(10.0,hi);
step = pow(10.0,step);
table->SetScaleToLog10();
table->SetTableRange(lo,hi);
table->Build();
TestAssert(table->GetIndex(lo) == 0);
TestAssert(table->GetIndex(hi) == 255);
TestAssert(table->GetIndex(lo+tol) == 0);
TestAssert(table->GetIndex(hi-tol) == 255);
TestAssert(table->GetIndex(vtkMath::Nan()) == -1);
// Note - both below- and above-range colors are enabled at this point
TestAssert(table->GetIndex(lo/step) == 0);
TestAssert(table->GetIndex(hi*step) == 255);
TestAssert(table->GetIndex(lo*step) == 1);
TestAssert(table->GetIndex(hi/step) == 254);
// negative log range
double tmp = hi;
hi = -lo;
lo = -tmp;
step = 1.0/step;
table->SetScaleToLog10();
table->SetTableRange(lo,hi);
table->Build();
TestAssert(table->GetIndex(lo) == 0);
TestAssert(table->GetIndex(hi) == 255);
TestAssert(table->GetIndex(lo+tol) == 0);
TestAssert(table->GetIndex(hi-tol) == 255);
TestAssert(table->GetIndex(lo/step) == 0);
TestAssert(table->GetIndex(hi*step) == 255);
TestAssert(table->GetIndex(lo*step) == 1);
TestAssert(table->GetIndex(hi/step) == 254);
// == check error reporting ==
errorObserver observer;
unsigned long observerId =
table->AddObserver(
vtkCommand::ErrorEvent, &observer, &errorObserver::Callback);
// linear table, range is null, permitted (step function)
observer.Reset();
table->SetScaleToLinear();
table->SetTableRange(0,0);
TestAssert(observer.GetEvent() == 0);
// linear table, range is inverted, illegal
observer.Reset();
table->SetScaleToLinear();
table->SetTableRange(1,-1);
TestAssert(observer.GetEvent() != 0);
// log table, range is null, permitted (step function)
observer.Reset();
table->SetScaleToLog10();
table->SetTableRange(0,0);
TestAssert(observer.GetEvent() == 0);
// log table, zero on upper end of range, permitted
observer.Reset();
table->SetScaleToLog10();
table->SetTableRange(-1.2,0);
TestAssert(observer.GetEvent() == 0);
// log table, zero on lower end of range, permitted
observer.Reset();
table->SetScaleToLog10();
table->SetTableRange(0,1.3);
TestAssert(observer.GetEvent() == 0);
// log table, range straddles zero, illegal
observer.Reset();
table->SetScaleToLog10();
table->SetTableRange(-0.5,1.1);
TestAssert(observer.GetEvent() != 0);
table->RemoveObserver(observerId);
return rval;
}
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