void mouseMoved()
{
  int nX = floor( (float)(mouseX - gnBarsLeft) / (float)(gnBarsWidth+gnBarsHSpace) );
  int nY = floor( (float)(mouseY - gnBarsTop) / (float)(gnBarsHeight+gnBarsVSpace) );
    
  // inside
  if( nX >= 0 && nX < 12*7 && nY >= 0 && nY < gpDataMatrices.length )
  {
    int nYearIdx   = floor(nX / 12);
    int nMonthIdx  = nX % 12;

    // skip if same to previous val
    if( gnPrevYearIdx*12+gnPrevMonthIdx == nX && gnPrevY == nY )

      ;    
      
    else  {
      
//      println(nY+" "+nYearIdx+" "+nMonthIdx);
  
//      if( gnPrevY >= 0 && gnPrevYearIdx >= 0 && gnPrevMonthIdx >= 0 )
//        gpBarsMouseEvent[gnPrevY][gnPrevYearIdx][gnPrevMonthIdx] = false;  // disable effect

      for( int k=0; k<gpDataMatrices.length; k++ )
        for( int i=0; i<7; i++ )
          for( int j=0; j<12; j++ )
            gpBarsMouseEvent[k][i][j] = false;
        
      // enable effect
      gpBarsMouseEvent[nY][nYearIdx][nMonthIdx] = true;
      
      gnPrevY         = nY;
      gnPrevYearIdx   = nYearIdx;
      gnPrevMonthIdx  = nMonthIdx;
      
    }
  }
  // outside
  else
  {
    if( gnPrevY >= 0 && gnPrevYearIdx >= 0 && gnPrevMonthIdx >= 0 )
      gpBarsMouseEvent[gnPrevY][gnPrevYearIdx][gnPrevMonthIdx] = false;
  }
}