Return Events::PhysicsContact object in Scene#on_contact_begin callback

[andrewhavens]

I noticed that the on_contact_begin method is documented as yielding an Events::PhysicsContact object. However, the code actually returns NULL. I am curious if this event object could provide some helpful information when determining collision behavior.

I'm working on finding efficient ways to detect whether or not my "player" sprite is colliding with something bad or something good. Right now my code looks like this:

on_contact_begin do |contact_event|
  puts "Bad: #{@hero.intersects?(@bad_guy)}"
  puts "Good: #{@hero.intersects?(@other_guy)}"
end

I'm assuming that checking the intersection of @hero on every collision is not the right approach. I wonder if cocos2d::PhysicsContact is intended to provide this information. Here is the documentation for that: http://cocos2d-x.org/docs/api-ref/cplusplus/v3x/d5/d22/classcocos2d_1_1_physics_contact.html

[eichert12]

Agreed, I ran into the same and think having the PhysicsContact object would be beneficial.

[lrz]

Looks like I forgot to wrap this one :( It shouldn't be hard to do this, you can add PhysicsContact to https://github.com/HipByte/motion-game/blob/master/src/events.cpp then change the #on_contact_begin callback to create and pass it (you can look at similar methods that create these event objects for an example of use).

I'm not sure what methods the PhysicsContact Ruby class should have. It looks like the interesting C++ methods are returning a PhysicsShape class (http://cocos2d-x.org/reference/native-cpp/V3.2/df/d56/classcocos2d_1_1_physics_shape.html).