Make sv.LineZone.trigger return bool np.ndarray informing which detections have crossed the line this frame

[SkalskiP]

Description

Currently, sv.LineZone.trigger updates in_count and out_count values but does not return information on which object crossed the line. Unlike sv.PolygonZone.trigger, which returns such information.

Information about who has crossed the line is needed to update in_count and out_count and is already calculated in the trigger method but does not surface. Let's change that.

[hardikdava]

Related PR: #264

[abhishek7kalra]

Hey, I would love to work on this issue. From what I could understand, all we need is initialise a bool array of size "detections", and checking where the object's state changes (indicating it has crossed the line), and setting it to True, and finally returning the array, just like in the polygon_zone.py

[SkalskiP]

Hi @abhishek7kalra 👋🏻! Looks like you got it. 🤞🏻 That's exactly what you have to do. The task is assigned to you.

[hardikdava]

Hey @abhishek7kalra, this part is already implemented. Feel free to look at other open issues. Thank you for taking interest in supervision.

@SkalskiP please review #264

[abhishek7kalra]

No worries. Do let me know @SkalskiP if this needs to be fixed. Thank you @hardikdava for the info.

[SkalskiP]

Hi once again, @abhishek7kalra. #264 is doing a lot of other things. I will handle that update separately. Try to focus on returning that numpy array. You can take some inspiration from #264, made by @hardikdava.

[abhishek7kalra]

Hi @SkalskiP, I have done the changes as discussed above and have created a PR here