comparison dsp/tonal/ChangeDetectionFunction.cpp @ 488:7992d0923626

Use M_PI

     License, or (at your option) any later version.  See the file
     COPYING included with this distribution for more information.
 */
 
 #include "ChangeDetectionFunction.h"
-
-#ifndef PI
-#define PI (3.14159265358979232846)
-#endif
 
 ChangeDetectionFunction::ChangeDetectionFunction(ChangeDFConfig config) :
     m_dFilterSigma(0.0), m_iFilterWidth(0)
 {
     setFilterWidth(config.smoothingWidth);

     // it is assumed that the gaussian is 0 outside of +/- FWHM
     // => filter width = 2*FWHM = 2*2.3548*sigma
     m_dFilterSigma = double(m_iFilterWidth) / double(2*2.3548);
     m_vaGaussian.resize(m_iFilterWidth);
         
-    double dScale = 1.0 / (m_dFilterSigma*sqrt(2*PI));
+    double dScale = 1.0 / (m_dFilterSigma*sqrt(2*M_PI));
         
     for (int x = -(m_iFilterWidth-1)/2; x <= (m_iFilterWidth-1)/2; x++) {
         double w = dScale * std::exp ( -(x*x)/(2*m_dFilterSigma*m_dFilterSigma) );
         m_vaGaussian[x + (m_iFilterWidth-1)/2] = w;
     }