code: def to_(self, data_pts):
          
          data_pts = np.asarray(data_pts, dtype=np.float)
          has_z = (data_pts.shape[-1] > 2)
  
          if self.use_center:
              data_pts = data_pts - self.viewer.data_off
  
          # subtract data indexes at center reference pixel
          ref_pt = [self.viewer._org_x, self.viewer._org_y]
          if has_z:
              ref_pt.append(self.viewer._org_z)
  
          off_pts = np.subtract(data_pts, ref_pt)
          return off_pts
docs: Reverse of :meth:`from_`.