8.10.8 wcs2pix(self,X,Y):

wcs2pix $<$ Map(BoaDataAnalyser.DataAna): $<$ BoaMapping.py

        DES: Convert from physical coordinate describe by self.WCS to pixel coordinate
        INP: float (X,Y) : the physical coordinate to convert from
        OUT: float (i,j) : the pixel coordinate(s)