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124 lines
4.4 KiB
C++
124 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 "cvfScalarMapperContinuousLog.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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#include <limits>
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namespace cvf {
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//==================================================================================================
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///
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/// \class cvf::ScalarMapperContinuousLog
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/// \ingroup Render
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///
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/// Maps scalar values to texture coordinates/colors using continuous logarithmic mapping
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/// Configured by specifying a number of level colors and a min/max range.
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//==================================================================================================
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ScalarMapperContinuousLog::ScalarMapperContinuousLog()
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: m_logRange(0.0)
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, m_logRangeMin(0.0)
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, m_hasNegativeRange(false)
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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 ScalarMapperContinuousLog::normalizedValue(double scalarValue) const
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{
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if (m_hasNegativeRange) scalarValue = -1.0*scalarValue;
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double logValue;
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if (scalarValue <= 0) logValue = std::numeric_limits<double>::min_exponent10;
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else logValue = log10(scalarValue);
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if (m_logRange != 0)
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{
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return cvf::Math::clamp((logValue - m_logRangeMin)/m_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 ScalarMapperContinuousLog::domainValue(double normalizedPosition) const
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{
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double logValue = normalizedPosition*m_logRange + m_logRangeMin;
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double domainVal = pow(10, logValue);
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if (m_hasNegativeRange)
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domainVal *= -1.0;
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return domainVal;
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}
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//--------------------------------------------------------------------------------------------------
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///
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//--------------------------------------------------------------------------------------------------
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void ScalarMapperContinuousLog::rangeUpdated()
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{
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m_hasNegativeRange = false;
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double transformedRangeMax = m_rangeMax;
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double transformedRangeMin = m_rangeMin;
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if ( m_rangeMax <= 0 && m_rangeMin <= 0)
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{
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m_hasNegativeRange = true;
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transformedRangeMax = -1.0*transformedRangeMax;
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transformedRangeMin = -1.0*transformedRangeMin;
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}
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double logRangeMax = (transformedRangeMax > 0) ? log10(transformedRangeMax): std::numeric_limits<double>::min_exponent10;
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m_logRangeMin = (transformedRangeMin > 0) ? log10(transformedRangeMin): std::numeric_limits<double>::min_exponent10;
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m_logRange = logRangeMax - m_logRangeMin;
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}
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} // namespace cvf
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