Event.BEGIN CONTACT
From GiderosMobile
Available since: Gideros 2011.6
Value: beginContact
Defined by: b2.World
Description
This event is dispatched when contact between box2d bodies begin.
Parameters
contact: (b2.Contact) contains instance of b2.Contact holding information about this collision
fixtureA: (b2.Fixture) contains instance of b2.Fixture of first colliding body
fixtureB: (b2.Fixture) contains instance of b2.Fixture of second colliding body
Example
LevelX = Core.class(Sprite)
function LevelX:init()
-- liquidfun
self.world = b2.World.new(0, 9.8 * 3, true) -- gravity x, gravity y, allow sleeping?
-- listeners
self:addEventListener("enterBegin", self.onTransitionInBegin, self)
self:addEventListener("enterEnd", self.onTransitionInEnd, self)
self:addEventListener("exitBegin", self.onTransitionOutBegin, self)
self:addEventListener("exitEnd", self.onTransitionOutEnd, self)
self.world:addEventListener(Event.BEGIN_CONTACT, self.onBeginContact, self)
self.world:addEventListener(Event.END_CONTACT, self.onEndContact, self)
self.world:addEventListener(Event.PRE_SOLVE, self.onPreSolveContact, self)
self.world:addEventListener(Event.POST_SOLVE, self.onPostSolveContact, self)
end
-- GAME LOOP
function LevelX:onEnterFrame(e)
self.world:step(1/60, 8, 3)
end
-- collisions handler
function LevelX:onBeginContact(e)
local fixtureA, fixtureB = e.fixtureA, e.fixtureB
local bodyA = e.fixtureA:getBody()
local bodyB = e.fixtureB:getBody()
-- PLAYER
if (bodyA.name == G_PLAYER and bodyB.name == G_GROUND) or (bodyA.name == G_GROUND and bodyB.name == G_PLAYER) then
if bodyA.name == G_PLAYER then bodyA.numfloorcontacts += 1
else bodyB.numfloorcontacts += 1
end
end
end
function LevelX:onEndContact(e)
local bodyA = e.fixtureA:getBody()
local bodyB = e.fixtureB:getBody()
-- PLAYER
if (bodyA.name == G_PLAYER and bodyB.name == G_GROUND) or (bodyA.name == G_GROUND and bodyB.name == G_PLAYER) then
if bodyA.name == G_PLAYER then bodyA.numfloorcontacts -= 1
else bodyB.numfloorcontacts -= 1
end
end
end
function LevelX:onPreSolveContact(e)
local bodyA = e.fixtureA:getBody()
local bodyB = e.fixtureB:getBody()
local platform, player
if bodyA.name == G_PTPLATFORM then platform = bodyA player = bodyB
else platform = bodyB player = bodyA
end
if not platform then return end
-- do stuff...
end
function LevelX:onPostSolveContact(e)
end
-- EVENT LISTENERS
function LevelX:onTransitionInBegin() self:addEventListener(Event.ENTER_FRAME, self.onEnterFrame, self) end
function LevelX:onTransitionInEnd() self:myKeysPressed() end
function LevelX:onTransitionOutBegin()
if self.channel then self.channel:stop() end
self:removeAllListeners()
end
function LevelX:onTransitionOutEnd() end
-- KEYS HANDLER
function LevelX:myKeysPressed()
self:addEventListener(Event.KEY_UP, function(e)
if e.keyCode == KeyCode.BACK or e.keyCode == KeyCode.ESC then self:goMenu() end
end)
end
function LevelX:goMenu() scenemanager:changeScene("menu", 1) end
