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113 lines
4.4 KiB
C++
113 lines
4.4 KiB
C++
//##################################################################################################
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//
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// Custom Visualization Core library
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// Copyright (C) 2011-2013 Ceetron AS
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//
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// This library may be used under the terms of either the GNU General Public License or
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// the GNU Lesser General Public License as follows:
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//
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// GNU General Public License Usage
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// This library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful, but WITHOUT ANY
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// WARRANTY; without even the implied warranty of MERCHANTABILITY or
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// FITNESS FOR A PARTICULAR PURPOSE.
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//
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// See the GNU General Public License at <<http://www.gnu.org/licenses/gpl.html>>
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// for more details.
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//
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// GNU Lesser General Public License Usage
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// This library is free software; you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation; either version 2.1 of the License, or
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// (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful, but WITHOUT ANY
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// WARRANTY; without even the implied warranty of MERCHANTABILITY or
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// FITNESS FOR A PARTICULAR PURPOSE.
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//
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// See the GNU Lesser General Public License at <<http://www.gnu.org/licenses/lgpl-2.1.html>>
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// for more details.
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//
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//##################################################################################################
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#include "cvfScalarMapperDiscreteLinear.h"
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#include "cvfMath.h"
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#include "cvfTextureImage.h"
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#include <cmath>
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namespace cvf {
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//==================================================================================================
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///
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/// \class cvf::ScalarMapperDiscreteLinear
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/// \ingroup Render
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///
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/// Maps scalar values to texture coordinates/colors using discrete linear mapping
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//==================================================================================================
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ScalarMapperDiscreteLinear::ScalarMapperDiscreteLinear()
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{
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}
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//--------------------------------------------------------------------------------------------------
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///
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//--------------------------------------------------------------------------------------------------
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Vec2f ScalarMapperDiscreteLinear::mapToTextureCoord(double scalarValue) const
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{
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double discVal = discretize(scalarValue, m_sortedLevels);
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return ScalarMapperRangeBased::mapToTextureCoord(discVal);
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}
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//--------------------------------------------------------------------------------------------------
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///
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//--------------------------------------------------------------------------------------------------
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Color3ub ScalarMapperDiscreteLinear::mapToColor(double scalarValue) const
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{
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double discVal = discretize(scalarValue, m_sortedLevels);
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return ScalarMapperRangeBased::mapToColor(discVal);
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}
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//--------------------------------------------------------------------------------------------------
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///
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//--------------------------------------------------------------------------------------------------
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double ScalarMapperDiscreteLinear::discretize(double scalarValue, const std::set<double>& sortedLevels)
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{
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std::set<double>::iterator it;
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it = sortedLevels.upper_bound(scalarValue);
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if (it == sortedLevels.begin()) return (*it);
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if (it == sortedLevels.end()) return (*sortedLevels.rbegin());
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double upperValue = *it;
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it--;
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double lowerValue = *it;
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return 0.5 * (upperValue + lowerValue);
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}
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//--------------------------------------------------------------------------------------------------
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///
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//--------------------------------------------------------------------------------------------------
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double ScalarMapperDiscreteLinear::normalizedValue(double domainScalarValue) const
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{
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double range = m_rangeMax - m_rangeMin;
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if (range != 0) return cvf::Math::clamp((domainScalarValue - m_rangeMin)/range, 0.0, 1.0);
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else return 0;
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}
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//--------------------------------------------------------------------------------------------------
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///
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//--------------------------------------------------------------------------------------------------
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double ScalarMapperDiscreteLinear::domainValue(double normalizedPosition) const
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{
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double range = m_rangeMax - m_rangeMin;
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return (normalizedPosition * range + m_rangeMin);
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}
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} // namespace cvf
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