bug fixes: change galsim.drawImage method to no_pixel

observation_sim/mock_objects/Galaxy.py

@@ -201,7 +201,7 @@ class Galaxy(MockObject):
             # gal = self.bfrac * bulge + (1.0 - self.bfrac - kfrac) * disk + kfrac * knots
 
         # stamp = gal.drawImage(wcs=chip_wcs_local, method='phot', offset=offset, save_photons=True)
-        stamp = gal.drawImage(wcs=chip_wcs_local, offset=offset)
+        stamp = gal.drawImage(method='no_pixel', wcs=chip_wcs_local, offset=offset)
         if np.sum(np.isnan(stamp.array)) > 0:
             # ERROR happens
             return 2, pos_shear

observation_sim/mock_objects/Stamp.py

@@ -92,7 +92,7 @@ class Stamp(MockObject):
             else:
                 gal = gal + gal_temp
 
-        stamp = gal.drawImage(wcs=chip_wcs_local, offset=offset)
+        stamp = gal.drawImage(method='no_pixel', wcs=chip_wcs_local, offset=offset)
         if np.sum(np.isnan(stamp.array)) > 0:
             # ERROR happens
             return 2, pos_shear