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+2 votes


I was trying to create a simple pos interpolation func using tween, but can't get a callback with tween_complete when it's finished.

func climb():
    var anim =
    # doesn't work!! -_-
    anim.connect("tween_complete", self, "timeout")
    anim.interpolate_property(self, "transform/pos", get_pos(), get_pos()+Vector2(10,10), 5, Tween.TRANS_LINEAR, Tween.EASE_IN_OUT)

func timeout():

After the pos is changed I'm getting an error in debug window without any details.
enter image description here
And the callback isn't called.

in Engine by (29 points)

If you hover the error there's a tooltip that might give some insight (it shows the C++ error). This is fixed for 2.1, which will show the C++ error if there's no proper description.

1 Answer

+3 votes
Best answer

tween_complete( Object object, String key ) This signal is emitted when a tween ends.

This is what reference document says.
You need to make 2 parameter for tween_complete signal.

func timeout(obj, key):
    print("timeout : obj = ",obj,", key = ", key)

This will work.

by (9,800 points)
selected by

Many thanks! I didn't know callback must include the parameters.

For anyone else reading: as of 2020 the signal name is tween_completed

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