Storyboard & Display Objects

Getting Started Newbie Questions
#1

Hello All,

I have been playing around with storyboard for the past couple of days and I have a few doubts.

I have a scene game.lua which has an array of display objects which will be updated every frame. When I switch to a different scene and come back to the game scene all the display objects doesn’t seem to reset to its original position IF the loadLevel()  is called from scene:createScene(). However it seems to reset all the positions fine when the loadLevel() is called from scene:enterScene( event ).

Any idea why this happens? Any help would be really apprecieated! 

– game.lua

local storyboard = require("storyboard") local scene = storyboard.newScene() local collectable = require("collectable") local obstacle = require("obstacle") local physics = require "physics" physics.start(); physics.pause( ) local function loadLevel(level)     local group = scene.view     local levelData = require("Levels.level" .. level)     local items = levelData.collectables     local obs = levelData.obstacles     for i=1,#items do         local item = collectable.new(i, items[i].x, items[i].y)         table.insert(collectables, item)         group:insert(collectables[i].renderObject)     end     for i=1,#obs do         local ob = obstacle.new(obs[i].x, obs[i].y)         table.insert(obstacles, ob)         group:insert(obstacles[i].renderObject)     end end function scene:createScene( event )     local group = self.view     -- loadLevel(currentLevel)    -- Doesn't reset the positions end function scene:enterScene( event )     local group = self.view     physics.start();     loadLevel(currentLevel)    -- Works fine end  

– menu.lua

function scene:enterScene( event )     local group = self.view     local previous = storyboard.getPrevious()     if previous ~= "main" and previous then               storyboard.removeScene(previous)     end     storyboard.gotoScene( "game", "fade", 500 ) end  
#2

Are you removing the game scene when you move to another scene? It would seem it is staying in memory, and when you return the createScene function is not called - this is only called when the scene does not yet exist in memory. enterScene is called each time you go to the scene.

I see you have some code in menu.lua to remove the previous scene - but is this code in all scenes?

#3

Hello Nick

Thanks for your reply. The createScene function is called when the game scene is called from menu. I still couldn’t find whats causing this. I have posted all the files for your perusual. Any help would be really helpful. Thanks

– game.lua

--------------------------------------------------------------------------------------- -- Requires ----------------------------------------------------------------------------------------- local storyboard = require("storyboard") local scene = storyboard.newScene() local collectable = require("collectable") local physics = require "physics" physics.start(); physics.pause( ) ----------------------------------------------------------------------------------------- -- Globals Variables ----------------------------------------------------------------------------------------- local currentLevel = 1 local prevTime = 0 local collectables = {} local screenW = display.contentWidth local screenH = display.contentHeight local halfW = display.contentWidth\*0.5 ----------------------------------------------------------------------------------------- -- Local Functions for this scene ----------------------------------------------------------------------------------------- local function loadLevel(level) &nbsp;&nbsp;&nbsp;&nbsp;local group = scene.view &nbsp;&nbsp;&nbsp;&nbsp;local levelData = require("Levels.level" .. level) &nbsp;&nbsp;&nbsp;&nbsp;local items = levelData.collectables &nbsp;&nbsp;&nbsp;&nbsp;local obs = levelData.obstacles &nbsp;&nbsp;&nbsp;&nbsp;for i=1,#items do &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;local item = collectable.new(i, items[i].x, items[i].y) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;table.insert(collectables, item) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;group:insert(collectables[i].renderObject) &nbsp;&nbsp;&nbsp;&nbsp;end end ----------------------------------------------------------------------------------------- -- Scene Functions ----------------------------------------------------------------------------------------- -- Called when the scene's view does not exist: function scene:createScene( event ) &nbsp;&nbsp;&nbsp;&nbsp;local group = self.view &nbsp;&nbsp;&nbsp;&nbsp;--loadLevel(currentLevel)&nbsp;&nbsp;&nbsp;&nbsp; -- Doesn't Work here end -- Called immediately after scene has moved onscreen: function scene:enterScene( event ) &nbsp;&nbsp;&nbsp;&nbsp;local group = self.view &nbsp;&nbsp;&nbsp;&nbsp;physics.start(); &nbsp;&nbsp;&nbsp;&nbsp;loadLevel(currentLevel)&nbsp;&nbsp;&nbsp;&nbsp;-- Workd here end local function enterFrame(event) &nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;print("enterFrame" ) &nbsp;&nbsp;&nbsp;&nbsp;local curTime = event.time &nbsp;&nbsp;&nbsp;&nbsp;local dt = (curTime - prevTime) /(1000) &nbsp;&nbsp;&nbsp;&nbsp;prevTime = curTime &nbsp;&nbsp;&nbsp;&nbsp;local i = 1 &nbsp;&nbsp;&nbsp;&nbsp;while i \<= #collectables do &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;collectables[i]:update(dt) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if(collectables[i]:checkwithinbounds()) then &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;i = i + 1 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;else &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;collectables[i]:destroy() &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;table.remove(collectables,i) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;end &nbsp;&nbsp;&nbsp;&nbsp;end end function ChangeScene( event ) &nbsp;&nbsp;&nbsp;&nbsp;storyboard.gotoScene( "menu", "fade", 500 ) end -- Called when scene is about to move offscreen: function scene:exitScene( event ) &nbsp;&nbsp;&nbsp;&nbsp;local group = self.view &nbsp;&nbsp;&nbsp;&nbsp;Runtime:removeEventListener( "enterFrame", enterFrame ) &nbsp;&nbsp;&nbsp;&nbsp;Runtime:removeEventListener("tap", ChangeScene ) end -- If scene's view is removed, scene:destroyScene() will be called just prior to: function scene:destroyScene( event ) &nbsp;&nbsp;&nbsp;&nbsp;local group = self.view &nbsp;&nbsp;&nbsp;&nbsp;package.loaded[physics] = nil &nbsp;&nbsp;&nbsp;&nbsp;physics = nil end ----------------------------------------------------------------------------------------- -- Add Event Listners ----------------------------------------------------------------------------------------- scene:addEventListener( "createScene", scene ) scene:addEventListener( "enterScene", scene ) scene:addEventListener( "exitScene", scene ) scene:addEventListener( "destroyScene", scene ) Runtime:addEventListener( "enterFrame", enterFrame ) Runtime:addEventListener( "tap", ChangeScene ) ----------------------------------------------------------------------------------------- return scene &nbsp;

– menu.lua

local storyboard = require( "storyboard" ) local scene = storyboard.newScene() -- include Corona's "widget" library local widget = require "widget" -------------------------------------------- -- forward declarations and other locals local playBtn -- 'onRelease' event listener for playBtn local function onPlayBtnRelease() &nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;-- go to level1.lua scene &nbsp;&nbsp;&nbsp;&nbsp;--storyboard.removeScene( "game" ) &nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;storyboard.gotoScene( "game", "fade", 500 ) &nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;return true&nbsp;&nbsp;&nbsp;&nbsp;-- indicates successful touch end ----------------------------------------------------------------------------------------- -- BEGINNING OF YOUR IMPLEMENTATION --&nbsp; -- NOTE: Code outside of listener functions (below) will only be executed once, --&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; unless storyboard.removeScene() is called. --&nbsp; ----------------------------------------------------------------------------------------- -- Called when the scene's view does not exist: function scene:createScene( event ) &nbsp;&nbsp;&nbsp;&nbsp;local group = self.view &nbsp;&nbsp;&nbsp;&nbsp;-- display a background image &nbsp;&nbsp;&nbsp;&nbsp;local background = display.newImageRect( "background.jpg", display.contentWidth, display.contentHeight ) &nbsp;&nbsp;&nbsp;&nbsp;background.anchorX = 0 &nbsp;&nbsp;&nbsp;&nbsp;background.anchorY = 0 &nbsp;&nbsp;&nbsp;&nbsp;background.x, background.y = 0, 0 &nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;-- create/position logo/title image on upper-half of the screen &nbsp;&nbsp;&nbsp;&nbsp;local titleLogo = display.newImageRect( "logo.png", 264, 42 ) &nbsp;&nbsp;&nbsp;&nbsp;titleLogo.x = display.contentWidth \* 0.5 &nbsp;&nbsp;&nbsp;&nbsp;titleLogo.y = 100 &nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;-- create a widget button (which will loads level1.lua on release) &nbsp;&nbsp;&nbsp;&nbsp;playBtn = widget.newButton{ &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;label="Play Now", &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;labelColor = { default={255}, over={128} }, &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;default="button.png", &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;over="button-over.png", &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;width=154, height=40, &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;onRelease = onPlayBtnRelease&nbsp;&nbsp;&nbsp;&nbsp;-- event listener function &nbsp;&nbsp;&nbsp;&nbsp;} &nbsp;&nbsp;&nbsp;&nbsp;playBtn.x = display.contentWidth\*0.5 &nbsp;&nbsp;&nbsp;&nbsp;playBtn.y = display.contentHeight - 125 &nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;-- all display objects must be inserted into group &nbsp;&nbsp;&nbsp;&nbsp;group:insert( background ) &nbsp;&nbsp;&nbsp;&nbsp;group:insert( titleLogo ) &nbsp;&nbsp;&nbsp;&nbsp;group:insert( playBtn ) end -- Called immediately after scene has moved onscreen: function scene:enterScene( event ) &nbsp;&nbsp;&nbsp;&nbsp;local group = self.view &nbsp;&nbsp;&nbsp;&nbsp;local previous = storyboard.getPrevious() if previous ~= "main" and previous then &nbsp; &nbsp; &nbsp; storyboard.removeScene(previous) end &nbsp;&nbsp;&nbsp;&nbsp;-- INSERT code here (e.g. start timers, load audio, start listeners, etc.) &nbsp;&nbsp;&nbsp;&nbsp; end -- Called when scene is about to move offscreen: function scene:exitScene( event ) &nbsp;&nbsp;&nbsp;&nbsp;local group = self.view &nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;-- INSERT code here (e.g. stop timers, remove listenets, unload sounds, etc.) &nbsp;&nbsp;&nbsp;&nbsp; end -- If scene's view is removed, scene:destroyScene() will be called just prior to: function scene:destroyScene( event ) &nbsp;&nbsp;&nbsp;&nbsp;local group = self.view &nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;if playBtn then &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;playBtn:removeSelf()&nbsp;&nbsp;&nbsp;&nbsp;-- widgets must be manually removed &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;playBtn = nil &nbsp;&nbsp;&nbsp;&nbsp;end end ----------------------------------------------------------------------------------------- -- END OF YOUR IMPLEMENTATION ----------------------------------------------------------------------------------------- -- "createScene" event is dispatched if scene's view does not exist scene:addEventListener( "createScene", scene ) -- "enterScene" event is dispatched whenever scene transition has finished scene:addEventListener( "enterScene", scene ) -- "exitScene" event is dispatched whenever before next scene's transition begins scene:addEventListener( "exitScene", scene ) -- "destroyScene" event is dispatched before view is unloaded, which can be -- automatically unloaded in low memory situations, or explicitly via a call to -- storyboard.purgeScene() or storyboard.removeScene(). scene:addEventListener( "destroyScene", scene ) ----------------------------------------------------------------------------------------- return scene &nbsp;

– collectable.lua

local collectable = {} local collectable\_mt = {\_\_index = collectable} ----------------------------------------------------------------------------------------- -- Private Functions ----------------------------------------------------------------------------------------- ----------------------------------------------------------------------------------------- -- Public Functions ----------------------------------------------------------------------------------------- function collectable.new( \_id, \_x, \_y) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;local newCollectable = { &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;renderObject = display.newImageRect("Assets/coin.png", 75, 75), &nbsp;&nbsp;&nbsp;&nbsp;} &nbsp;&nbsp;&nbsp;&nbsp;physics.addBody(newCollectable.renderObject, "static", { density=73.0, friction=0.3, bounce=0.3 }) &nbsp;&nbsp;&nbsp;&nbsp;newCollectable.renderObject.x = \_x &nbsp;&nbsp;&nbsp;&nbsp;newCollectable.renderObject.y = \_y &nbsp;&nbsp;&nbsp;&nbsp;newCollectable.renderObject.name = "collectable" &nbsp;&nbsp;&nbsp;&nbsp;newCollectable.renderObject.id = \_id &nbsp;&nbsp;&nbsp;&nbsp;newCollectable.renderObject.isSensor = true &nbsp;&nbsp;&nbsp;&nbsp;return setmetatable( newCollectable, collectable\_mt ) end function collectable:translate(\_x, \_y) &nbsp;&nbsp;&nbsp;&nbsp;self.renderObject.x = self.renderObject.x - \_x &nbsp;&nbsp;&nbsp;&nbsp;self.renderObject.y = self.renderObject.y - \_y end function collectable:update(\_dt) &nbsp;&nbsp;&nbsp;&nbsp;local speed = 100 &nbsp;&nbsp;&nbsp;&nbsp;self.renderObject:translate(-(speed \* \_dt), 0) end function collectable:checkwithinbounds(\_dt) &nbsp;&nbsp;&nbsp;&nbsp;if (self.renderObject.x + 75/2 \<= 0) then &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return false &nbsp;&nbsp;&nbsp;&nbsp;else &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return true &nbsp;&nbsp;&nbsp;&nbsp;end end function collectable:destroy() &nbsp;&nbsp;&nbsp;&nbsp;self.renderObject:removeSelf() &nbsp;&nbsp;&nbsp;&nbsp;self.renderObject = nil end return collectable &nbsp;

– level1.lua

local levelData = {}; levelData.collectables = { {x = 542, y = 262}, {x = 870, y = 262}, {x = 1030, y = 534}, {x = 1670, y = 166}, {x = 1878, y = 166}, } return levelData; &nbsp;

– main.lua 

-- hide the status bar display.setStatusBar( display.HiddenStatusBar ) -- include the Corona "storyboard" module local storyboard = require "storyboard" -- load menu screen storyboard.gotoScene( "menu" ) &nbsp;
#4

Are you removing the game scene when you move to another scene? It would seem it is staying in memory, and when you return the createScene function is not called - this is only called when the scene does not yet exist in memory. enterScene is called each time you go to the scene.

I see you have some code in menu.lua to remove the previous scene - but is this code in all scenes?

#5

Hello Nick

Thanks for your reply. The createScene function is called when the game scene is called from menu. I still couldn’t find whats causing this. I have posted all the files for your perusual. Any help would be really helpful. Thanks

– game.lua

--------------------------------------------------------------------------------------- -- Requires ----------------------------------------------------------------------------------------- local storyboard = require("storyboard") local scene = storyboard.newScene() local collectable = require("collectable") local physics = require "physics" physics.start(); physics.pause( ) ----------------------------------------------------------------------------------------- -- Globals Variables ----------------------------------------------------------------------------------------- local currentLevel = 1 local prevTime = 0 local collectables = {} local screenW = display.contentWidth local screenH = display.contentHeight local halfW = display.contentWidth\*0.5 ----------------------------------------------------------------------------------------- -- Local Functions for this scene ----------------------------------------------------------------------------------------- local function loadLevel(level) &nbsp;&nbsp;&nbsp;&nbsp;local group = scene.view &nbsp;&nbsp;&nbsp;&nbsp;local levelData = require("Levels.level" .. level) &nbsp;&nbsp;&nbsp;&nbsp;local items = levelData.collectables &nbsp;&nbsp;&nbsp;&nbsp;local obs = levelData.obstacles &nbsp;&nbsp;&nbsp;&nbsp;for i=1,#items do &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;local item = collectable.new(i, items[i].x, items[i].y) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;table.insert(collectables, item) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;group:insert(collectables[i].renderObject) &nbsp;&nbsp;&nbsp;&nbsp;end end ----------------------------------------------------------------------------------------- -- Scene Functions ----------------------------------------------------------------------------------------- -- Called when the scene's view does not exist: function scene:createScene( event ) &nbsp;&nbsp;&nbsp;&nbsp;local group = self.view &nbsp;&nbsp;&nbsp;&nbsp;--loadLevel(currentLevel)&nbsp;&nbsp;&nbsp;&nbsp; -- Doesn't Work here end -- Called immediately after scene has moved onscreen: function scene:enterScene( event ) &nbsp;&nbsp;&nbsp;&nbsp;local group = self.view &nbsp;&nbsp;&nbsp;&nbsp;physics.start(); &nbsp;&nbsp;&nbsp;&nbsp;loadLevel(currentLevel)&nbsp;&nbsp;&nbsp;&nbsp;-- Workd here end local function enterFrame(event) &nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;print("enterFrame" ) &nbsp;&nbsp;&nbsp;&nbsp;local curTime = event.time &nbsp;&nbsp;&nbsp;&nbsp;local dt = (curTime - prevTime) /(1000) &nbsp;&nbsp;&nbsp;&nbsp;prevTime = curTime &nbsp;&nbsp;&nbsp;&nbsp;local i = 1 &nbsp;&nbsp;&nbsp;&nbsp;while i \<= #collectables do &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;collectables[i]:update(dt) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if(collectables[i]:checkwithinbounds()) then &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;i = i + 1 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;else &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;collectables[i]:destroy() &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;table.remove(collectables,i) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;end &nbsp;&nbsp;&nbsp;&nbsp;end end function ChangeScene( event ) &nbsp;&nbsp;&nbsp;&nbsp;storyboard.gotoScene( "menu", "fade", 500 ) end -- Called when scene is about to move offscreen: function scene:exitScene( event ) &nbsp;&nbsp;&nbsp;&nbsp;local group = self.view &nbsp;&nbsp;&nbsp;&nbsp;Runtime:removeEventListener( "enterFrame", enterFrame ) &nbsp;&nbsp;&nbsp;&nbsp;Runtime:removeEventListener("tap", ChangeScene ) end -- If scene's view is removed, scene:destroyScene() will be called just prior to: function scene:destroyScene( event ) &nbsp;&nbsp;&nbsp;&nbsp;local group = self.view &nbsp;&nbsp;&nbsp;&nbsp;package.loaded[physics] = nil &nbsp;&nbsp;&nbsp;&nbsp;physics = nil end ----------------------------------------------------------------------------------------- -- Add Event Listners ----------------------------------------------------------------------------------------- scene:addEventListener( "createScene", scene ) scene:addEventListener( "enterScene", scene ) scene:addEventListener( "exitScene", scene ) scene:addEventListener( "destroyScene", scene ) Runtime:addEventListener( "enterFrame", enterFrame ) Runtime:addEventListener( "tap", ChangeScene ) ----------------------------------------------------------------------------------------- return scene &nbsp;

– menu.lua

local storyboard = require( "storyboard" ) local scene = storyboard.newScene() -- include Corona's "widget" library local widget = require "widget" -------------------------------------------- -- forward declarations and other locals local playBtn -- 'onRelease' event listener for playBtn local function onPlayBtnRelease() &nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;-- go to level1.lua scene &nbsp;&nbsp;&nbsp;&nbsp;--storyboard.removeScene( "game" ) &nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;storyboard.gotoScene( "game", "fade", 500 ) &nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;return true&nbsp;&nbsp;&nbsp;&nbsp;-- indicates successful touch end ----------------------------------------------------------------------------------------- -- BEGINNING OF YOUR IMPLEMENTATION --&nbsp; -- NOTE: Code outside of listener functions (below) will only be executed once, --&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; unless storyboard.removeScene() is called. --&nbsp; ----------------------------------------------------------------------------------------- -- Called when the scene's view does not exist: function scene:createScene( event ) &nbsp;&nbsp;&nbsp;&nbsp;local group = self.view &nbsp;&nbsp;&nbsp;&nbsp;-- display a background image &nbsp;&nbsp;&nbsp;&nbsp;local background = display.newImageRect( "background.jpg", display.contentWidth, display.contentHeight ) &nbsp;&nbsp;&nbsp;&nbsp;background.anchorX = 0 &nbsp;&nbsp;&nbsp;&nbsp;background.anchorY = 0 &nbsp;&nbsp;&nbsp;&nbsp;background.x, background.y = 0, 0 &nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;-- create/position logo/title image on upper-half of the screen &nbsp;&nbsp;&nbsp;&nbsp;local titleLogo = display.newImageRect( "logo.png", 264, 42 ) &nbsp;&nbsp;&nbsp;&nbsp;titleLogo.x = display.contentWidth \* 0.5 &nbsp;&nbsp;&nbsp;&nbsp;titleLogo.y = 100 &nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;-- create a widget button (which will loads level1.lua on release) &nbsp;&nbsp;&nbsp;&nbsp;playBtn = widget.newButton{ &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;label="Play Now", &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;labelColor = { default={255}, over={128} }, &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;default="button.png", &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;over="button-over.png", &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;width=154, height=40, &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;onRelease = onPlayBtnRelease&nbsp;&nbsp;&nbsp;&nbsp;-- event listener function &nbsp;&nbsp;&nbsp;&nbsp;} &nbsp;&nbsp;&nbsp;&nbsp;playBtn.x = display.contentWidth\*0.5 &nbsp;&nbsp;&nbsp;&nbsp;playBtn.y = display.contentHeight - 125 &nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;-- all display objects must be inserted into group &nbsp;&nbsp;&nbsp;&nbsp;group:insert( background ) &nbsp;&nbsp;&nbsp;&nbsp;group:insert( titleLogo ) &nbsp;&nbsp;&nbsp;&nbsp;group:insert( playBtn ) end -- Called immediately after scene has moved onscreen: function scene:enterScene( event ) &nbsp;&nbsp;&nbsp;&nbsp;local group = self.view &nbsp;&nbsp;&nbsp;&nbsp;local previous = storyboard.getPrevious() if previous ~= "main" and previous then &nbsp; &nbsp; &nbsp; storyboard.removeScene(previous) end &nbsp;&nbsp;&nbsp;&nbsp;-- INSERT code here (e.g. start timers, load audio, start listeners, etc.) &nbsp;&nbsp;&nbsp;&nbsp; end -- Called when scene is about to move offscreen: function scene:exitScene( event ) &nbsp;&nbsp;&nbsp;&nbsp;local group = self.view &nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;-- INSERT code here (e.g. stop timers, remove listenets, unload sounds, etc.) &nbsp;&nbsp;&nbsp;&nbsp; end -- If scene's view is removed, scene:destroyScene() will be called just prior to: function scene:destroyScene( event ) &nbsp;&nbsp;&nbsp;&nbsp;local group = self.view &nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;if playBtn then &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;playBtn:removeSelf()&nbsp;&nbsp;&nbsp;&nbsp;-- widgets must be manually removed &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;playBtn = nil &nbsp;&nbsp;&nbsp;&nbsp;end end ----------------------------------------------------------------------------------------- -- END OF YOUR IMPLEMENTATION ----------------------------------------------------------------------------------------- -- "createScene" event is dispatched if scene's view does not exist scene:addEventListener( "createScene", scene ) -- "enterScene" event is dispatched whenever scene transition has finished scene:addEventListener( "enterScene", scene ) -- "exitScene" event is dispatched whenever before next scene's transition begins scene:addEventListener( "exitScene", scene ) -- "destroyScene" event is dispatched before view is unloaded, which can be -- automatically unloaded in low memory situations, or explicitly via a call to -- storyboard.purgeScene() or storyboard.removeScene(). scene:addEventListener( "destroyScene", scene ) ----------------------------------------------------------------------------------------- return scene &nbsp;

– collectable.lua

local collectable = {} local collectable\_mt = {\_\_index = collectable} ----------------------------------------------------------------------------------------- -- Private Functions ----------------------------------------------------------------------------------------- ----------------------------------------------------------------------------------------- -- Public Functions ----------------------------------------------------------------------------------------- function collectable.new( \_id, \_x, \_y) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;local newCollectable = { &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;renderObject = display.newImageRect("Assets/coin.png", 75, 75), &nbsp;&nbsp;&nbsp;&nbsp;} &nbsp;&nbsp;&nbsp;&nbsp;physics.addBody(newCollectable.renderObject, "static", { density=73.0, friction=0.3, bounce=0.3 }) &nbsp;&nbsp;&nbsp;&nbsp;newCollectable.renderObject.x = \_x &nbsp;&nbsp;&nbsp;&nbsp;newCollectable.renderObject.y = \_y &nbsp;&nbsp;&nbsp;&nbsp;newCollectable.renderObject.name = "collectable" &nbsp;&nbsp;&nbsp;&nbsp;newCollectable.renderObject.id = \_id &nbsp;&nbsp;&nbsp;&nbsp;newCollectable.renderObject.isSensor = true &nbsp;&nbsp;&nbsp;&nbsp;return setmetatable( newCollectable, collectable\_mt ) end function collectable:translate(\_x, \_y) &nbsp;&nbsp;&nbsp;&nbsp;self.renderObject.x = self.renderObject.x - \_x &nbsp;&nbsp;&nbsp;&nbsp;self.renderObject.y = self.renderObject.y - \_y end function collectable:update(\_dt) &nbsp;&nbsp;&nbsp;&nbsp;local speed = 100 &nbsp;&nbsp;&nbsp;&nbsp;self.renderObject:translate(-(speed \* \_dt), 0) end function collectable:checkwithinbounds(\_dt) &nbsp;&nbsp;&nbsp;&nbsp;if (self.renderObject.x + 75/2 \<= 0) then &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return false &nbsp;&nbsp;&nbsp;&nbsp;else &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return true &nbsp;&nbsp;&nbsp;&nbsp;end end function collectable:destroy() &nbsp;&nbsp;&nbsp;&nbsp;self.renderObject:removeSelf() &nbsp;&nbsp;&nbsp;&nbsp;self.renderObject = nil end return collectable &nbsp;

– level1.lua

local levelData = {}; levelData.collectables = { {x = 542, y = 262}, {x = 870, y = 262}, {x = 1030, y = 534}, {x = 1670, y = 166}, {x = 1878, y = 166}, } return levelData; &nbsp;

– main.lua 

-- hide the status bar display.setStatusBar( display.HiddenStatusBar ) -- include the Corona "storyboard" module local storyboard = require "storyboard" -- load menu screen storyboard.gotoScene( "menu" ) &nbsp;