basic physics question

Getting Started Newbie Questions
#1

Just starting to untangle physics…

I cannot understand why the following code is necessary in the Collision Detection code sample
crate1.collision = onLocalCollision
crate1:addEventListener( “collision”, crate1 )
I tried

–crate1.collision = onLocalCollision
crate1:addEventListener( “collision”, onLocalCollision )

and of course it doesn’t work, but I don’t understand why you first assign the event function, onLocalCollision, as a property of crate1. Is “collision” a predefined property that I am just not aware of?

as always thanks

[import]uid: 50215 topic_id: 10661 reply_id: 310661[/import]

#2

Looks like you’re missing some stuff. Here’s what your code should look like:

--assume you've created crate1 and added physics to it  
  
local function onLocalCollision(self, event)  
 if event.phase == "began" then  
 print("collided")  
 end  
end  
  
crate1.collision = onLocalCollision  
crate1:addEventListener( "collision", crate1 )

“collision” is predefined, yes. Read here: http://developer.anscamobile.com/content/game-edition-collision-detection [import]uid: 48658 topic_id: 10661 reply_id: 38729[/import]