def transform(self):
AffineWidget.transform(self)
if not hasattr(self, 'src_keypoints'):
return
if self.mouse_state != self.onmouse_wait:
self.matches = []
return
self.dst_keypoints, self.dst_descriptors = self.detect(self.dst)
self.matches = self.match(self.src_descriptors, self.dst_descriptors)
