How to know which entity collided after Game.physics().move() method?

[nightm4re94]

^{This post has been migrated automatically from the old LITIENGINE forum (2018 - 2022).
Posted: 2019-05-31 20:44:46
User: CalvinMT [] (age: 1451 days 🔥; posts: 114)}
Hi!
I'm wondering if their is currently a way to know with which entity an other entity has collided with after making one of them moving with the ~~*~~Game.physics().move()* method?
Edit:
I don't know if I'm clear enough, so here's an example.

• - Entity_A is moving towards entity_B and entity_C using the the ~~*~~move()* method from ~~*~~Game.physics()*.
• - Entity_A suddenly stops in front of entity_B and entity_C because it is colliding with one of them.
• - How to know if entity_A collided with entity_B or entity_C?
  Obviously, I was hopping that the move() method would give the entity with which entity_A collides with, but it only returns a boolean.
  I tried to check intersections, but they aren't intersecting. And in my case, it would cost a lot to check through each entity anyway.
  Edit2:
  I think it may be important to specify that entity_B and entity_C are both collision boxes created from the LITIengine CollissionBox class.

[nightm4re94]

^{This post has been migrated automatically from the old LITIENGINE forum (2018 - 2022).
Posted: 2019-06-04 11:30:06
User: CalvinMT [] (age: 1451 days 🔥; posts: 114)}
@steffen
I figured their weren't any way for the moment to do what I wanted.
So I managed to implement one in the LITIengine, which I'm about to make a pull request on GitHub.

[nightm4re94]

^{This post has been migrated automatically from the old LITIENGINE forum (2018 - 2022).
Posted: 2019-06-05 22:24:49
User: nightm4re [Admin 👑, Mod 🔧] (age: 1567 days 🔥; posts: 185)}
I could imagine returning the ID of the colliding entity instead of just a true boolean, but that would probably break a lot of things elsewhere.
what's your approach?

[nightm4re94]

^{This post has been migrated automatically from the old LITIENGINE forum (2018 - 2022).
Posted: 2019-06-06 12:10:16
User: CalvinMT [] (age: 1451 days 🔥; posts: 114)}
> nightm4re I could imagine returning the ID of the colliding entity instead of just a true boolean, but that would probably break a lot of things elsewhere.
I figured that would be the case.
So I looked for where that boolean was first created and found what I wanted in one of the ~~*~~collides()* method.
This method checks each other entity that one can collide with and returns true if a collision is possible according to a predicate.
So, before returning true, I just call a method I created in ~~*~~ICollisionEntity* that takes an ICollisionEntity to set it in a variable. With this done, it is possible to access one of the collided entity directly from the other.
You can find the code here: https://github.com/gurkenlabs/litiengine/pull/270/files