code: func AlignmentNew(xalign, yalign, xscale, yscale float32) (*Alignment, error) {
  	c := C.gtk_alignment_new(C.gfloat(xalign), C.gfloat(yalign), C.gfloat(xscale),
  		C.gfloat(yscale))
  	if c == nil {
  		return nil, nilPtrErr
  	}
  	obj := glib.Take(unsafe.Pointer(c))
  	return wrapAlignment(obj), nil
  }
docs: // AlignmentNew is a wrapper around gtk_alignment_new().