adding eventListener from an external function

erez9901 · July 21, 2013, 12:18pm

well I have a class called: functions.lua

and there i put all my functions

now i want to make the ball - (player) move

so did:

local functions = require(“functions”)

then I added the event listener like this:

ball:addEventListener(“touch”,functions.moveBall)

and i get this error

stack traceback:

[C]: ?

[C]: in function 'assert’

?: in function 'getOrCreateTable’

?: in function 'addEventListener’

…rs/erezcsillag/Documents/ballGameCORONA/levelone.lua:122: in function <…rs/erezcsillag/Documents/ballGameCORONA/levelone.lua:121>

?: in function 'dispatchEvent’

?: in function <?:1076>

(tail call): ?

?: in function <?:172>

?: in function <?:218>

please help me out!!

erez9901 · July 21, 2013, 2:19pm

**UP**

horacebury · July 21, 2013, 2:40pm

Sounds like your function is either local or you did not assign it to an object called ‘functions’. Just doing ‘require(“functions”)’ will not assign your function to an object called ‘functions’ - you can just call it.

Post your actual code and I’ll correct it for you.

erez9901 · July 21, 2013, 7:02pm

ok.

--------levelone-------

display.setStatusBar(display.HiddenStatusBar) local storyboard = require ("storyboard") local functions = require ("functions") local scene = storyboard.newScene() local physics = require("physics") physics.start() local bg local ball local ps1 local ps2 local platform local winFlag local winningFloor local floor local rWall local lWall local ceiling local ballBounce = 1.3 local physicsData = (require "flag").physicsData(scaleFactor) --== ------------[CREATESCENE]----------- ==-- function scene:createScene(event) &nbsp; &nbsp;&nbsp; &nbsp; local screenGroup = self.view &nbsp; &nbsp; bg = display.newImage("game/bg.png") &nbsp; &nbsp; screenGroup:insert(bg) &nbsp; &nbsp; ball = display.newImage("game/ball.png") &nbsp; &nbsp; screenGroup:insert(ball) &nbsp; &nbsp; winFlag = display.newImage("game/flag.png") &nbsp; &nbsp; screenGroup:insert(winFlag) &nbsp; &nbsp; platform = display.newImage("game/platform\_normal.png") &nbsp; &nbsp; screenGroup:insert(platform) &nbsp; &nbsp; ps1 = display.newImage("game/platform\_small.png") &nbsp; &nbsp; screenGroup:insert(ps1) &nbsp; &nbsp; ps2 = display.newImage("game/platform\_small.png") &nbsp; &nbsp; screenGroup:insert(ps2) &nbsp; &nbsp; winningFloor = display.newImage("game/floor.png") &nbsp; &nbsp; screenGroup:insert(winningFloor) &nbsp; &nbsp; floor = display.newImage("game/invisbleWall1.png") &nbsp; &nbsp; screenGroup:insert(floor) &nbsp; &nbsp; lWall = display.newImage("game/invisbleWall2.png") &nbsp; &nbsp; screenGroup:insert(lWall) &nbsp; &nbsp; rWall = display.newImage("game/invisbleWall2.png") &nbsp; &nbsp; screenGroup:insert(rWall) &nbsp; &nbsp; ceiling = display.newImage("game/invisbleWall1.png") &nbsp; &nbsp; screenGroup:insert(ceiling) &nbsp; &nbsp;&nbsp; floor.type = "walls" lWall.type = "walls" rWall.type = "walls" ceiling.type = "walls" floor.y = 356 ceiling.y = -37 rWall.x = 517 lWall.x = -36 physics.addBody(floor,"static") physics.addBody(ceiling,"static") physics.addBody(rWall,"static") physics.addBody(lWall,"static") local gameIsOver = false local rotateSpeed = 3.5 local rotateSpeedHole = 10 local ballBounce = 0.6&nbsp; local platformFirstScale = 0.9 winningFloor:setReferencePoint(display.CenterReferencePoint) winningFloor.x = 420 winningFloor.y = 296 physics.addBody(winningFloor,"static") winFlag:setReferencePoint(display.CenterReferencePoint) winFlag.x = 420 winFlag.y = 260 winFlag.xScale = 0.7 winFlag.yScale = 0.7 winFlag.type = "win" physics.addBody( winFlag, "static",physicsData:get("flag") ) platform:setReferencePoint(display.CenterReferencePoint) platform.x = 108 platform.y = 40 platform.xScale = platformFirstScale platform.yScale = platformFirstScale physics.addBody( platform, "static", { friction=0.5, bounce=0.3 } ) ps1:setReferencePoint(display.CenterReferencePoint) ps1.x = 60 ps1.y = 20 ps1.xScale = platformFirstScale ps1.yScale = platformFirstScale physics.addBody( ps1, "static", { friction=0.5, bounce=0.3 } ) ps2:setReferencePoint(display.CenterReferencePoint) ps2.x = 155 ps2.y = 20 ps2.xScale = platformFirstScale ps2.yScale = platformFirstScale physics.addBody( ps2, "static", { friction=0.5, bounce=0.3 } ) ball:setReferencePoint(display.CenterReferencePoint) ball.x = 50 ball.y = 90 ball.xScale = 0.14 ball.yScale = 0.14 ball.type = "ball" end --== ----------[ENTERSCENE]---------- ==-- function scene:enterScene(event) &nbsp; ball:addEventListener("touch", functions.startPhysics) &nbsp; &nbsp; platform:addEventListener("touch", functions.startDrag) &nbsp; ps1:addEventListener("touch", functions.startDrag) &nbsp; ps2:addEventListener("touch", functions.startDrag) &nbsp; ball.collision = functions.ballCollision &nbsp; ball:addEventListener("collision", ball)&nbsp; end --== ----------[EXITSCENE]---------- ==-- function scene:exitScene(event) end --== ----------[DESTROYSCENE]---------- ==-- function scene:destroyScene(event) &nbsp; end -------------------[EVENTLISTENERS]---------------- &nbsp; scene:addEventListener( "createScene", scene ) &nbsp; scene:addEventListener( "enterScene", scene ) &nbsp; scene:addEventListener( "exitScene", scene ) &nbsp; scene:addEventListener( "destroyScene", scene ) &nbsp; return scene &nbsp;

-----------functions------

local function startDrag(event) &nbsp; &nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; local t = event.target &nbsp; &nbsp; &nbsp; &nbsp; local phase = event.phase &nbsp; &nbsp; &nbsp; &nbsp; if "began" == phase then &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; t:removeEventListener("touch", rotatePlatform) &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; display.getCurrentStage():setFocus( t ) &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; t.isFocus = true &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; -- Store initial position &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; t.x0 = event.x - t.x &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; t.y0 = event.y - t.y &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; t = transition.to( t, { xScale=1, yScale=1} ) &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; -- Make body type temporarily "kinematic" (to avoid gravitional forces) &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; event.target.bodyType = "kinematic" &nbsp; &nbsp; &nbsp; &nbsp; elseif t.isFocus then &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; if "moved" == phase then &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; t.x = event.x - t.x0 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; t.y = event.y - t.y0 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; elseif "ended" == phase then &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; display.getCurrentStage():setFocus( nil ) &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; t.isFocus = false &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; t:removeEventListener("touch",startDrag) &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; t:addEventListener("touch",rotatePlatform) &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; end &nbsp; &nbsp; &nbsp; &nbsp; end &nbsp; &nbsp; &nbsp; &nbsp; -- Stop further propagation of touch event! &nbsp; &nbsp; &nbsp; &nbsp; return true end &nbsp; &nbsp; local function rotatePlatform(event) &nbsp; &nbsp; &nbsp; &nbsp; local t = event.target &nbsp; &nbsp; &nbsp; &nbsp; local phase = event.phase &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; if (phase == "began") then &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; display.getCurrentStage():setFocus( t ) &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; t.isFocus = true &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; -- Store initial position of finger &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; t.x1 = event.x &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; t.y1 = event.y &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; elseif t.isFocus then &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; if (phase == "moved") then &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; t.x2 = event.x &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; t.y2 = event.y &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; angle1 = 180/math.pi \* math.atan2(t.y1 - t.y , t.x1 - t.x) &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; angle2 = 180/math.pi \* math.atan2(t.y2 - t.y , t.x2 - t.x) &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; print("angle1 = "..angle1) &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; rotationAmt = angle1 - angle2 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; --rotate it &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; t.rotation = t.rotation - rotationAmt &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; print ("t.rotation = "..t.rotation) &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; t.x1 = t.x2 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; t.y1 = t.y2 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; elseif (phase == "ended") then &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; t:addEventListener("touch", startDrag) &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; display.getCurrentStage():setFocus( nil ) &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; t.isFocus = false &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; t:removeEventListener("touch", rotatePlatform) &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; end &nbsp; &nbsp; &nbsp; &nbsp; end &nbsp; &nbsp; &nbsp; &nbsp; return true end local function gameOver(event) &nbsp; &nbsp; storyboard.gotoScene("levelselect", "fade", 700) &nbsp; &nbsp; print("gameover") end local function ballCollision(self,event) &nbsp; if event.phase == "began" then &nbsp; &nbsp; rotateSpeed = 0 &nbsp; &nbsp; if(event.target.type == "ball" and event.other.type == "walls") then &nbsp; &nbsp; &nbsp; gameOver() &nbsp; &nbsp; &nbsp; end &nbsp; &nbsp; if event.target.type == "ball" and event.other.type == "win" then &nbsp; &nbsp; &nbsp; levelComplete() &nbsp; &nbsp; &nbsp; end &nbsp; &nbsp; end &nbsp; &nbsp;&nbsp; &nbsp; &nbsp; if event.phase == "moved" then &nbsp; &nbsp; &nbsp; rotateSpeed = 3.5 &nbsp; &nbsp; &nbsp; end &nbsp; &nbsp;&nbsp; &nbsp; &nbsp; if event.phase == "ended" then &nbsp; &nbsp; &nbsp; rotateSpeed = 3.5 &nbsp; &nbsp; &nbsp; end &nbsp; end &nbsp;&nbsp; local function levelComplete(event) &nbsp; &nbsp; ball:setLinearVelocity(0,0) &nbsp; &nbsp; storyboard.gotoScene("levelselect","fade",700) &nbsp; &nbsp; print("levelCompleted") &nbsp; &nbsp; end &nbsp; &nbsp; local function startPhysics(event) &nbsp; local phase = event.phase &nbsp; local t = event.target &nbsp; if phase == "began" then &nbsp; &nbsp; platform:removeEventListener("touch", rotatePlatform) &nbsp; &nbsp; platform:removeEventListener("touch", startDrag) &nbsp; &nbsp; ps1:removeEventListener("touch", rotatePlatform) &nbsp; &nbsp; &nbsp; ps1:removeEventListener("touch", startDrag) &nbsp; &nbsp; ps2:removeEventListener("touch", rotatePlatform) &nbsp; &nbsp; ps2:removeEventListener("touch", startDrag) &nbsp; &nbsp; physics.addBody(t,{bounce = ballBounce ,radius = 18}) &nbsp; end &nbsp; end &nbsp;&nbsp; &nbsp; local allFun = { &nbsp; &nbsp;&nbsp;&nbsp;&nbsp;startPhysics, &nbsp; &nbsp;&nbsp;&nbsp;&nbsp;levelComplete, &nbsp; &nbsp;&nbsp;&nbsp;&nbsp;rotatePlatform, &nbsp; &nbsp;&nbsp;&nbsp;&nbsp;startDrag, &nbsp; &nbsp;&nbsp;&nbsp;&nbsp;gameOver, &nbsp; &nbsp;&nbsp;&nbsp;&nbsp;ballCollision &nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;} &nbsp;&nbsp; &nbsp; return allFun &nbsp;

horacebury · July 24, 2013, 9:08am

Your functions class returns a table containing the functions, but they are not named, they are numerically indexed. If you loop through the table

for i=1, #functions do print(functions[i]) end

You will see a list of functions, but they have no names. The easiest way to call them by name is to change your functions in the functions.lua to declare each function like this:

allFun.startPhysics = function( event )

And move your allFun to the top of the file like this:

local allFun = {}

erez9901 · July 25, 2013, 2:48pm

horacebury:

Your functions class returns a table containing the functions, but they are not named, they are numerically indexed. If you loop through the table
for i=1, #functions do print(functions[i]) end
You will see a list of functions, but they have no names. The easiest way to call them by name is to change your functions in the functions.lua to declare each function like this:
allFun.startPhysics = function( event )
And move your allFun to the top of the file like this:
local allFun = {}

thanks

erez9901 · July 21, 2013, 2:19pm