Merge pull request #26774 from anntzer/eacc

timhoffm · web-flow · commit 84ad4e5b9523 · 2025-03-11T11:35:13.000+01:00
Connect the Animation event source callback in the constructor.
diff --git a/lib/matplotlib/animation.py b/lib/matplotlib/animation.py
@@ -891,6 +891,7 @@ def __init__(self, fig, event_source=None, blit=False):
         # that cause the frame sequence to be iterated.
         self.frame_seq = self.new_frame_seq()
         self.event_source = event_source
+        self.event_source.add_callback(self._step)
 
         # Instead of starting the event source now, we connect to the figure's
         # draw_event, so that we only start once the figure has been drawn.
@@ -923,13 +924,9 @@ def _start(self, *args):
             return
         # First disconnect our draw event handler
         self._fig.canvas.mpl_disconnect(self._first_draw_id)
-
         # Now do any initial draw
         self._init_draw()
-
-        # Add our callback for stepping the animation and
-        # actually start the event_source.
-        self.event_source.add_callback(self._step)
+        # Actually start the event_source.
         self.event_source.start()
 
     def _stop(self, *args):
