ResInsight/Fwk/VizFwk/LibRender/cvfScalarMapperDiscreteLinear.cpp

118 lines
4.5 KiB
C++

//##################################################################################################
//
// Custom Visualization Core library
// Copyright (C) 2011-2013 Ceetron AS
//
// This library may be used under the terms of either the GNU General Public License or
// the GNU Lesser General Public License as follows:
//
// GNU General Public License Usage
// This library is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This library is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE.
//
// See the GNU General Public License at <<http://www.gnu.org/licenses/gpl.html>>
// for more details.
//
// GNU Lesser General Public License Usage
// This library is free software; you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation; either version 2.1 of the License, or
// (at your option) any later version.
//
// This library is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE.
//
// See the GNU Lesser General Public License at <<http://www.gnu.org/licenses/lgpl-2.1.html>>
// for more details.
//
//##################################################################################################
#include "cvfScalarMapperDiscreteLinear.h"
#include "cvfMath.h"
#include "cvfTextureImage.h"
#include <cmath>
#include <assert.h>
namespace cvf {
//==================================================================================================
///
/// \class cvf::ScalarMapperDiscreteLinear
/// \ingroup Render
///
/// Maps scalar values to texture coordinates/colors using discrete linear mapping
//==================================================================================================
ScalarMapperDiscreteLinear::ScalarMapperDiscreteLinear()
{
}
//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
Color3ub ScalarMapperDiscreteLinear::mapToColor(double scalarValue) const
{
assert(m_sortedLevels.size() > 0);
double discVal = ScalarMapperDiscreteLinear::discretizeToLevelBelow(scalarValue, m_sortedLevels);
std::set<double>::reverse_iterator it = m_sortedLevels.rbegin();
if (m_sortedLevels.size() > 1 ) it++;
double levelUnderMax = *it;
double normDiscVal = normalizedValue(discVal);
double normSemiMaxVal = normalizedValue(levelUnderMax);
double adjustedNormVal = 0;
if (normSemiMaxVal != 0) adjustedNormVal = cvf::Math::clamp(normDiscVal/normSemiMaxVal, 0.0, 1.0);
return colorFromUserColorGradient(adjustedNormVal);
}
//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
double ScalarMapperDiscreteLinear::discretizeToLevelBelow(double scalarValue, const std::set<double>& sortedLevels)
{
std::set<double>::iterator it;
it = sortedLevels.upper_bound(scalarValue);
if (it == sortedLevels.begin()) return (*it);
if (it == sortedLevels.end()) return (*sortedLevels.rbegin());
it--;
double lowerValue = *it;
return lowerValue;
}
//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
double ScalarMapperDiscreteLinear::normalizedValue(double domainScalarValue) const
{
double range = m_rangeMax - m_rangeMin;
if (range != 0) return cvf::Math::clamp((domainScalarValue - m_rangeMin)/range, 0.0, 1.0);
else return 0;
}
//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
double ScalarMapperDiscreteLinear::domainValue(double normalizedPosition) const
{
double range = m_rangeMax - m_rangeMin;
return (normalizedPosition * range + m_rangeMin);
}
} // namespace cvf