coords

Pan[xPan][yPan](xPix,yPix).rgb=srcImg(x,y).rgb

 

xM=x⊙m                                                      yM=y⊙m

xSlide=floor((double)xM_ corner/xBase)              ySlide=floor((double)yM_ corner/yBase)

xPan=floor((double)xM/xBase)- xSlide             yPan=floor((double)yM/yBase)- ySlide

xPix=xM – xBase*xPan                                   yPix=yM – y

=============================================================