tomwalters@397: /*!
tomwalters@397:  * \file
tomwalters@397:  * \brief Frequency scale for generating filter banks and their frequencies
tomwalters@397:  *
tomwalters@397:  * \author Willem van Engen <cnbh@willem.engen.nl>
tomwalters@397:  * \date created 2006/09/28
tomwalters@397:  * \version \$Id: Scale.cpp 459 2007-11-08 11:50:04Z tom $
tomwalters@397:  */
tomwalters@397: /* (c) 2006, University of Cambridge, Medical Research Council
tomwalters@397:  * http://www.pdn.cam.ac.uk/groups/cnbh/aimmanual
tomwalters@397:  */
tom@399: #include "Support/Common.h"
tom@399: #include "Modules/Output/Graphics/Scale/Scale.h"
tom@399: #include "Modules/Output/Graphics/Scale/ScaleLinear.h"
tom@399: #include "Modules/Output/Graphics/Scale/ScaleERB.h"
tom@399: #include "Modules/Output/Graphics/Scale/ScaleLog.h"
tom@399: #include "Modules/Output/Graphics/Scale/ScaleLogScaled.h"
tomwalters@397: 
tom@400: namespace aimc {
tom@400: 
tom@399: Scale *Scale::Create(ScaleType iType,
tom@399: 		     unsigned int min,
tom@399: 		     unsigned int max,
tom@399: 		     float density) {
tomwalters@398:   switch(iType) {
tomwalters@398:   case SCALE_LINEAR:
tomwalters@398:     return static_cast<Scale*>(new ScaleLinear(min, max, density));
tomwalters@398:   case SCALE_ERB:
tomwalters@398:     return static_cast<Scale*>(new ScaleERB(min, max, density));
tomwalters@398:   case SCALE_LOG:
tomwalters@398:     return static_cast<Scale*>(new ScaleLog(min, max, density));
tomwalters@398:   case SCALE_LOGSCALED:
tomwalters@398:     return static_cast<Scale*>(new ScaleLogScaled(min, max, density));
tomwalters@398:   default:
tom@400:     AIM_ASSERT(0);
tomwalters@398:     break;
tomwalters@398:   }
tomwalters@398:   // Unreachable code
tom@400:   AIM_ASSERT(0);
tomwalters@398:   return NULL;
tomwalters@397: }
tomwalters@397: 
tom@399: Scale *Scale::Create(ScaleType iType) {
tomwalters@398:   return Create(iType, 0, 0, 0);
tomwalters@397: }
tomwalters@397: 
tom@399: Scale *Scale::Clone() {
tomwalters@398:   Scale *pScale = Create(m_iType, m_iMin, m_iMax, m_fDensity);
tom@399:   AIM_ASSERT(pScale);
tomwalters@398:   pScale->m_fScaledCurHalfSum = m_fScaledCurHalfSum;
tomwalters@398:   pScale->m_fScaledCurDiff = m_fScaledCurDiff;
tomwalters@398:   return pScale;
tomwalters@397: }
tomwalters@397: 
tom@399: float Scale::FromLinearScaled(float fVal) {
tomwalters@398:   /*! This function returns
tomwalters@398:    *    ( FromLinear(fVal) - (fMinScaled+fMaxScaled)/2 ) / (fMaxScaled-fMinScaled)
tomwalters@398:    */
tomwalters@398:   float fValScaled = FromLinear(fVal);
tomwalters@398:   return (fValScaled - m_fScaledCurHalfSum) / m_fScaledCurDiff;
tomwalters@397: }
tom@399: 
tom@399: void Scale::FromLinearScaledExtrema(float fMin, float fMax) {
tomwalters@398:   float fMinScaled = FromLinear(fMin);
tomwalters@398:   float fMaxScaled = FromLinear(fMax);
tomwalters@398:   m_fScaledCurHalfSum = (fMinScaled+fMaxScaled)/2;
tomwalters@398:   m_fScaledCurDiff = fMaxScaled-fMinScaled;
tomwalters@398:   m_fMin = fMin;
tomwalters@398:   m_fMax = fMax;
tomwalters@397: }
tom@399: 
tom@399: void Scale::FromLinearScaledExtrema(Scale *pScale) {
tom@400:   AIM_ASSERT(pScale);
tomwalters@398:   FromLinearScaledExtrema(pScale->m_fMin, pScale->m_fMax);
tomwalters@397: }
tom@400: }  // namespace aimc