tomwalters@116: /*!
tomwalters@116:  * \file
tomwalters@116:  * \brief Frequency scale for generating filter banks and their frequencies
tomwalters@116:  *
tomwalters@116:  * \author Willem van Engen <cnbh@willem.engen.nl>
tomwalters@116:  * \date created 2006/09/28
tomwalters@116:  * \version \$Id: Scale.cpp 459 2007-11-08 11:50:04Z tom $
tomwalters@116:  */
tomwalters@116: /* (c) 2006, University of Cambridge, Medical Research Council
tomwalters@116:  * http://www.pdn.cam.ac.uk/groups/cnbh/aimmanual
tomwalters@116:  */
tom@229: #include "Support/Common.h"
tom@229: #include "Modules/Output/Graphics/Scale/Scale.h"
tom@229: #include "Modules/Output/Graphics/Scale/ScaleLinear.h"
tom@229: #include "Modules/Output/Graphics/Scale/ScaleERB.h"
tom@229: #include "Modules/Output/Graphics/Scale/ScaleLog.h"
tom@229: #include "Modules/Output/Graphics/Scale/ScaleLogScaled.h"
tomwalters@116: 
tom@229: Scale *Scale::Create(ScaleType iType,
tom@229: 		     unsigned int min,
tom@229: 		     unsigned int max,
tom@229: 		     float density) {
tomwalters@228:   switch(iType) {
tomwalters@228:   case SCALE_LINEAR:
tomwalters@228:     return static_cast<Scale*>(new ScaleLinear(min, max, density));
tomwalters@228:   case SCALE_ERB:
tomwalters@228:     return static_cast<Scale*>(new ScaleERB(min, max, density));
tomwalters@228:   case SCALE_LOG:
tomwalters@228:     return static_cast<Scale*>(new ScaleLog(min, max, density));
tomwalters@228:   case SCALE_LOGSCALED:
tomwalters@228:     return static_cast<Scale*>(new ScaleLogScaled(min, max, density));
tomwalters@228:   default:
tomwalters@228:     aimASSERT(0);
tomwalters@228:     break;
tomwalters@228:   }
tomwalters@228:   // Unreachable code
tomwalters@228:   aimASSERT(0);
tomwalters@228:   return NULL;
tomwalters@116: }
tomwalters@116: 
tom@229: Scale *Scale::Create(ScaleType iType) {
tomwalters@228:   return Create(iType, 0, 0, 0);
tomwalters@116: }
tomwalters@116: 
tom@229: Scale *Scale::Clone() {
tomwalters@228:   Scale *pScale = Create(m_iType, m_iMin, m_iMax, m_fDensity);
tom@229:   AIM_ASSERT(pScale);
tomwalters@228:   pScale->m_fScaledCurHalfSum = m_fScaledCurHalfSum;
tomwalters@228:   pScale->m_fScaledCurDiff = m_fScaledCurDiff;
tomwalters@228:   return pScale;
tomwalters@116: }
tomwalters@116: 
tom@229: float Scale::FromLinearScaled(float fVal) {
tomwalters@228:   /*! This function returns
tomwalters@228:    *    ( FromLinear(fVal) - (fMinScaled+fMaxScaled)/2 ) / (fMaxScaled-fMinScaled)
tomwalters@228:    */
tomwalters@228:   float fValScaled = FromLinear(fVal);
tomwalters@228:   return (fValScaled - m_fScaledCurHalfSum) / m_fScaledCurDiff;
tomwalters@227: }
tom@229: 
tom@229: void Scale::FromLinearScaledExtrema(float fMin, float fMax) {
tomwalters@228:   float fMinScaled = FromLinear(fMin);
tomwalters@228:   float fMaxScaled = FromLinear(fMax);
tomwalters@228:   m_fScaledCurHalfSum = (fMinScaled+fMaxScaled)/2;
tomwalters@228:   m_fScaledCurDiff = fMaxScaled-fMinScaled;
tomwalters@228:   m_fMin = fMin;
tomwalters@228:   m_fMax = fMax;
tomwalters@227: }
tom@229: 
tom@229: void Scale::FromLinearScaledExtrema(Scale *pScale) {
tomwalters@228:   aimASSERT(pScale);
tomwalters@228:   FromLinearScaledExtrema(pScale->m_fMin, pScale->m_fMax);
tomwalters@116: }