Add useful collision methods/classes.

[Ayfri]

PIXI is great for making web games, but there are no methods in the library to test collision between two sprites or two rectangles. It's not difficult to create a function for testing collision between simple AABB but with anchor, pivot, rotation and scew it's a bit more complicated and having something very optimised is not very easy with all these properties.

So I think that DisplayObject class or just Rectangle should have methods for testing collisions, and maybe have methods to get the offsets and the center of the collision.

[miltoncandelero]

It's merged 😄
#7563

after it goes live you can do stuff like

oneSprite.getBounds().intersects(otherSprite.getBounds());

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For more complicated collision, you need SAT (separating axis theorem) and that wouldn't include complex or concave shapes, so you need triangulation (teselation) first... and your complexity escalates 😬

[bigtimebuddy]

Thanks @Ayfri for the suggestion. Aside from what @miltoncandelero suggested, anything more involved will collision detection is outside of the scope of Pixi and we don't plan to address. Pixi is not a game library or framework. We've been very intentional to keep it constrained to rendering as much as possible. Other suggestions welcomed.

Will transfer this to a discussion.

[mreinstein]

@miltoncandelero shameless plug, but I've been maintaining pure 2d collision modules which support a lot of aabb and line segment type collisions:

• https://github.com/mreinstein/collision-2d
• https://github.com/mreinstein/collide-and-slide-2d

You'll find that these are very opinionated though. Maybe they will be useful.