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73 lines
2.6 KiB
C++
73 lines
2.6 KiB
C++
//##################################################################################################
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//
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// Custom Visualization Core library
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// Copyright (C) 2011-2012 Ceetron AS
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//
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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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//##################################################################################################
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#include "cvfScalarMapperDiscreteLog.h"
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#include <cmath>
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#include "cvfMath.h"
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namespace cvf {
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//==================================================================================================
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///
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/// \class cvf::ScalarMapperDiscreteLog
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/// \ingroup Render
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///
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/// Maps scalar values to texture coordinates/colors using discrete logarithmic mapping
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//==================================================================================================
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//--------------------------------------------------------------------------------------------------
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///
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//--------------------------------------------------------------------------------------------------
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double ScalarMapperDiscreteLog::normalizedLevelPosition(double domainScalarValue) const
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{
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double logRangeMax = log10(m_rangeMax);
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double logRangeMin = log10(m_rangeMin);
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double logRange = logRangeMax - logRangeMin;
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double logValue;
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if (domainScalarValue <= 0) logValue = logRangeMin;
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else logValue = log10(domainScalarValue);
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if (logRange != 0)
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{
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return cvf::Math::clamp((logValue - logRangeMin)/logRange, 0.0, 1.0);
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}
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else
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{
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return 0;
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}
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}
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//--------------------------------------------------------------------------------------------------
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///
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//--------------------------------------------------------------------------------------------------
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double ScalarMapperDiscreteLog::domainValue(double normalizedPosition) const
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{
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double logRangeMax = log10(m_rangeMax);
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double logRangeMin = log10(m_rangeMin);
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double logRange = logRangeMax - logRangeMin;
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double logValue = normalizedPosition*logRange + logRangeMin;
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return pow(10, logValue);
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}
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} // namespace cvf
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