I'm trying to make a game in Corona SDK where a player runs and survives through obstacles by either jumping over them or killing them using bullets. The problem is that the game ends even if the player fires the bullet. But it should be over only if the player collides with the obstacles.
This is my code till now!!
--local screen_adjustment = 1
local physics = require "physics"
physics.start()
local storyboard = require ("storyboard")
local scene = storyboard.newScene()
function scene:createScene( event )
local screenGroup=self.view
background=display.newImage("rsz_islands1-background-animation.png")
background:setReferencePoint(display.BottomLeftReferencePoint)
background.x=-50
background.y=330
background.speed=math.random(2,6)
screenGroup:insert(background)
background1=display.newImage("rsz_islands1-background-animation.png")
background1:setReferencePoint(display.BottomLeftReferencePoint)
background1.x=500
background1.y=330
background1.speed=math.random(2,6)
screenGroup:insert(background1)
rightArrow=display.newImageRect("right_arrow.png",50,100)
rightArrow:setReferencePoint(display.BottomLeftReferencePoint)
rightArrow.x=370
rightArrow.y=290
screenGroup:insert(rightArrow)
upArrow=display.newImageRect("up_Arrow.png",100,50)
upArrow:setReferencePoint(display.BottomLeftReferencePoint)
upArrow.x=250
upArrow.y=240
screenGroup:insert(upArrow)
stone=display.newImageRect("stone.png",100,50)
stone:setReferencePoint(display.BottomLeftReferencePoint)
stone.x=math.random(500,1500)
stone.y=280
stone.speed=math.random(2,6)
physics.addBody(stone,"static",{bounce=0,friction=0,})
screenGroup:insert(stone)
base = display.newRect(0,0,450,3)
base.x=-50
base.y=282
base:setReferencePoint(display.BottomLeftReferencePoint)
base:setFillColor(255,255,255)
--physics.addBody(base,"static",{bounce=0.1,friction=0.1})
physics.addBody(base,"static",{bounce=0,friction=1.0,density=1.0})
screenGroup:insert(base)
base.myName="base1"
local sheetData = {
width=65,
height=75,
numFrames=4,
sheetContentWidth=130,
sheetContentHeight=150
}
local mySprite = graphics.newImageSheet("imageSheet.png",sheetData)
local sequenceData = {
name="normalRun",
frames={1,2,3,4},
time=500,
loopcount=0
}
animation = display.newSprite(mySprite,sequenceData)
if(animation.x<50) then
animation.x=50
end
animation.y=245
physics.addBody(animation,{bounce=0.3,friction=1.0,density=1.0,radius=35})
animation:play()
screenGroup:insert(animation)
animation.myName="animation1"
local sheetTigerData = {
width=100,
height=57,
numFrames=8,
sheetContentWidth=400,
sheetContentHeight=120
}
local myTigerSprite
graphics.newImageSheet("tigerImageSheet.png",sheetTigerData)
local sequenceTigerData = {
name="normalRun",
frames={1,2,3,4,5,6,7,8},
time=500,
loopcount=0
}
tigeranimation = display.newSprite(myTigerSprite,sequenceTigerData)
--tigeranimation.x=700
tigeranimation.x=math.random(500,1500)
tigeranimation.y=255
tigeranimation.speed=math.random(2,6)
physics.addBody(tigeranimation,"static",{bounce=0,friction=.2})
tigeranimation:play()
screenGroup:insert(tigeranimation)
local sheetBirdData = {
width=60,
height=40,
numFrames=6,
sheetContentWidth=180,
sheetContentHeight=80
}
local myBirdSprite =
graphics.newImageSheet("birdimagesheet.png",sheetBirdData)
local sequenceBirdData = {
name="normalRun",
frames={1,2,3,4,5,6},
time=500,
loopcount=0
}
birdanimation = display.newSprite(myBirdSprite,sequenceBirdData)
birdanimation.x=math.random(500,2500)
birdanimation.y=math.random(100,200)
birdanimation.speed=2
birdanimation.initY=birdanimation.y
birdanimation.amp=50
birdanimation.angle=math.random(1,360)
physics.addBody(birdanimation,"static",{friction=.2,bounce=0})
birdanimation:play()
screenGroup:insert(birdanimation)
local sheetCatData = {
width=100,
height=48,
numFrames=8,
sheetContentWidth=200,
sheetContentHeight=200
}
local myCatSprite =
graphics.newImageSheet("rsz_runningcat.png",sheetCatData)
local sequenceCatData = {
name="normalRun",
frames={2,1,4,3,6,5,8,7},
time=500,
loopcount=0
}
catanimation = display.newSprite(myCatSprite,sequenceCatData)
catanimation.x=tigeranimation.x+math.random(110,1500)
catanimation.y=255
catanimation.speed=math.random(2,6)
physics.addBody(catanimation,"static",{bounce=0,friction=.2})
catanimation:play()
screenGroup:insert(catanimation)
gameSound=audio.loadStream("gamesound.mp3")
audio.play(gameSound)
gunshot=audio.loadStream("gunshot3.mp3")
end
function scrollBack( self,event )
if self.x<-590 then
self.x=500
audio.play(gameSound)
else
self.x=self.x-3
audio.play(gameSound)
end
end
function moveTiger( self,event )
if self.x<-100 then
self.x=math.random(1500,4000)
self.y=255
self.speed=math.random(3,6)
audio.play(gameSound)
else
self.x=self.x-self.speed
audio.play(gameSound)
end
end
function moveCat( self,event )
if self.x<-100 then
self.x=tigeranimation.x+math.random(800,2000)
self.y=255
self.speed=math.random(3,6)
else
self.x=self.x-self.speed
end
end
function moveStone( self,event )
if self.x<-100 then
self.x=math.random(1000,5000)
self.y=280
self.speed=math.random(3,6)
else
self.x=self.x-self.speed
end
end
function moveBird( self,event )
if self.x<-100 then
self.x=math.random(500,2500)
--self.x=300
self.y=math.random(100,200)
self.speed=2
self.amp=math.random(25,75)
self.angle=math.random(1,360)
--self.y=280
--self.speed=math.random(3,6)
else
self.x=self.x-self.speed
self.angle=self.angle+.1
self.y=self.amp*math.sin(self.angle)+self.initY
end
end
function fireLasers()
blaster = display.newImageRect( "bullet.png", 40, 15 )
physics.addBody(blaster,"dynamic")
blaster.x = animation.x+50
blaster.y = animation.y-10
--blaster.collided=false
if(animation.x<50) then
animation.x=50
end
transition.to( blaster, { time=1000, x=500} )
audio.play(gunshot)
end
function handleFireButton( event )
if ( event.phase == "began" ) then
-- Fire the weapon
fireLasers()
elseif ( event.phase == "ended" ) then
-- Stop firing the weapon
fireLasers()
end
return true
end
positionInAir = false
function jump(event)
if(event.phase == "began" and positionInAir==false) then
--playerInAir = true
--animation:setLinearVelocity( 0, 1 )
animation:applyForce(0,-1000,animation.x,animation.y)
positionInAir=true
--physics.addBody(animation,"dynamic")
--print("touch")
end
return true
end
function onCollision( event )
if(event.object1.myName == "base1" and event.object2.myName == "animation1")
then
positionInAir = false;
-- base:removeSelf()
end
end
local function onManCollide(event)
if ( event.phase == "began" ) then
storyboard.gotoScene("restart","fade",400)
audio.stop()
end
end
function scene:enterScene( event )
background.enterFrame=scrollBack
Runtime:addEventListener("enterFrame",background)
background1.enterFrame=scrollBack
Runtime:addEventListener("enterFrame",background1)
stone.enterFrame=moveStone
Runtime:addEventListener("enterFrame",stone)
tigeranimation.enterFrame=moveTiger
Runtime:addEventListener("enterFrame",tigeranimation)
birdanimation.enterFrame=moveBird
Runtime:addEventListener("enterFrame",birdanimation)
catanimation.enterFrame=moveCat
Runtime:addEventListener("enterFrame",catanimation)
animation.collision=onManCollide
animation:addEventListener("collision",onManCollide)
rightArrow:addEventListener( "touch", handleFireButton )
--Runtime:addEventListener( "touch", handleFireButton )
--Runtime:addEventListener( "enterFrame", handleFireButton )
--upArrow:addEventListener("touch", jump)
--Runtime:addEventListener( "collision", onCollision )
--Runtime:addEventListener( "touch", onScreenTouch )
--rightArrow:addEventListener( "touch", handleFireButton )
end
function scene:exitScene( event )
Runtime:removeEventListener("enterFrame",background)
Runtime:removeEventListener("enterFrame",background1)
Runtime:removeEventListener("enterFrame",stone)
Runtime:removeEventListener("enterFrame",tigeranimation)
Runtime:removeEventListener("enterFrame",birdanimation)
Runtime:removeEventListener("enterFrame",catanimation)
Runtime:removeEventListener("enterFrame",onManCollide)
rightArrow:removeEventListener( "touch", handleFireButton )
upArrow:removeEventListener("touch", jump)
Runtime:removeEventListener( "collision", onCollision )
end
function scene:destroyScene( event )
end
--local myGroup=display.newGroup()
--physics.addBody(background,"static",{bounce=0.1,friction=0.9})
--physics.addBody(background1,"static",{ bounce=0.1,friction=0.9})
scene:addEventListener("createScene",scene)
scene:addEventListener("enterScene",scene)
scene:addEventListener("exitScene",scene)
scene:addEventListener("destroyScene",scene)
return scene
You need to ask a specific question, what you have said is quite vague. Does the game end each time the player fires the bullet? Also you should consider migrating from storyboard to composer.
I'm a beginner in Corona developping and i've to problem to identify the collision between 3 objects. In fact, this is my code :
The first object is my player :
player = display.newImageRect("ballon.png", 150,170 )
player.anchorX = 0.5
player.anchorY = 0.5
player.x = display.contentCenterX - 450
player.y = display.contentCenterY+250
physics.addBody(player, "static", {density=0.1, bounce=0.1, friction=0.1,})
player.myName="player"
screenGroup:insert(player)
The second object is created within a function :
function addWindSlow(self,event)
height = math.random(display.contentCenterY - 200, display.contentCenterY + 200)
windslow = display.newImage( "wind-neg.png")
windslow.x = display.contentWidth
windslow.y = height
windslow.speed = 4
windslow.myName="windslow"
physics.addBody(windslow, "static", {density = 0.1, bounce = 0, isSensor = false})
elements:insert(windslow) end
function addWindFast(self,event)
height = math.random(display.contentCenterY - 200, display.contentCenterY + 200)
windfast = display.newImage( "wind-pos.png")
windfast.x = display.contentWidth
windfast.y = height
windfast.speed = 4
windfast.myName="windfast"
physics.addBody(windfast, "static", {density = 0.1, bounce = 0, isSensor = false})
elements:insert(windfast) end
And finally, the thirth object is the same but called "addWindFast() with a different image"
So i would like to know once my player is on collision with the windslow, i need to do an action... and if it's the object windfast, another action. That's my code :
function onCollision( event )
if ( event.phase == "began" ) then
if event.other.windslow and event.other.isVisible==true then
print("windslow has been touch !")
end
end
end
I found something about the pre-collision, I'll use it once i got the information how to "identify" the object...I'll need to prevent the collision and avoid it if the player is going to touch the windfast or windslow.
We thank you for all dude !
It looks like windslow and windfast are defined outside of onCollision event handler so you should compare to those:
function onCollision( event )
if ( event.phase == "began" ) then
if event.other == windslow and event.other.isVisible==true then
print("windslow has been touch !")
end
if event.other == windfast and event.other.isVisible==true then
print("windfast has been touch !")
end
end
end -- (missing from your post but probably in your code)
The above assumes that you have registered for collision events on your player. You could also register a different collision handler on each wind:
windslow:addEventListener("collision", onCollisionSlow)
windfast:addEventListener("collision", onCollisionFast)
In that case the two collision handlers could just check if event.other == player. The advantage of that is you are separating the code for each one. You could of course do the same with your player handler:
function onCollisionSlow(other)
print('collided with slow')
end
function onCollisionFast(other)
print('collided with fast')
end
collisionHandlers = {
[windslow] = onCollisionSlow,
[windfast] = onCollisionFast,
}
function onCollision( event )
if ( event.phase == "began" ) then
collisionFunc = collisionHandlers[event.other]
if collisionFunc ~= nil and event.other.isVisible then
collisionFunc(event.other)
end
end
end
You could identify the other object with the myName property you've specified.
For example:
function onCollision( event )
if ( event.phase == "began" ) then
if (event.other.myName == "windslow" and event.other.isVisible==true) then
print("windslow has been touched!")
elseif (event.other.myName = "windfast" and event.other.isVisible==true) then
print("windfast has been touched!")
end
end
It looks like I am having problems with transitioning from my level select page to my first level. I think it might be that I am missing something in my level 1, but I don't know exactly.
levelSelect.lua
module(..., package.seeall)
local director = require ("director")
local physics = require("physics")
physics.start()
local widget = require( "widget" )
-- Function to handle button events
local function handleButtonEventLevel1( event )
local phase = event.phase
if "ended" == phase then
director:changeScene("lvl1")
end
end
--local function goLevel1()
--director:changeScene("lvl1")
--return true
--end
--widget.newButton:addEventListener("tap", goLevel1)
local function handleButtonEventToPage( event )
local phase = event.phase
if "ended" == phase then
director:changeScene("page")
end
end
-- Main function - MUST return a display.newGroup()
function new()
local localGroup = display.newGroup()
local background = display.newImage("bigtestsky.png")
background.x=150
background.y=250
local myButton = widget.newButton
{
left = 25,
top = 25,
width = 100,
height = 50,
defaultFile = "default.png",
overFile = "over.png",
label = "1",
font = "LS",
fontSize = 20,
labelColor = { default = {0,0,50}, over = {0,0,255} },
onEvent = handleButtonEventLevel1,
}
local myButton = widget.newButton
{
left = 25,
top = 415,
width = 100,
height = 50,
defaultFile = "default.png",
overFile = "over.png",
label = "BACK",
font = "LS",
fontSize = 20,
labelColor = { default = {0,0,50}, over = {0,0,255} },
onEvent = handleButtonEventToPage,
}
return localGroup
end
lvl1.lua
local physics = require("physics")
physics.start()
local widget = require( "widget" )
(This is what I mean about missing something in the first level. Could someone please help?)
stack traceback:
[C]: ?
.../myName/Desktop/Bubbles! App/director.lua:116: in function 'loadScene'
.../myName/Desktop/Bubbles! App/director.lua:394: in function 'changeScene'
...myName/Desktop/Bubbles! App/levelSelect.lua:14: in function '_onEvent'
?: in function '?'
?: in function <?:405>
?: in function <?:218>
These are due to some issues with your class: lvl1.lua.
If such error occurs, open director.lua analyse the error return line. This will help you to find what the real problem is.
Here, you must write more lines in your lvl1.lua as below:
module(...,package.seeall) -- If this line is not written, then the package will not be loaded.
function new() -- Module 'lvl1' must have a new() function
local localGroup = display.newGroup() -- The scene should create a display group
local physics = require("physics")
physics.start()
local widget = require( "widget" )
print("Inside lvl1...")
return localGroup; -- And the scene should return the previously created display group.
end
Keep Coding.............. :)
Hi how can i remove all objects with the same name, if i use:
local screenGroup = self.view
local randomBad3 = function()
badC3 = display.newImage("BCloud3-"..tostring(math.random(1, 12))..".png")
badC3.x = math.random (0, 450); badC3.y = -50-- -50
physics.addBody( badC3, { density=.3, bounce=0.3, friction=.3, radius=25, filter=badc3CollisionFilter } )
badC3.name = "BCloud3"
badC3.isSensor = true
badC3.rotation = math.random(-30,30) -- Rotate the object
trans5 = transition.to( badC3, { time= math.random(yForB3A, yForB3B), y=600, transition=easing.OutExpo } )
badC3.gravityScale = 0.0
local cleanup
cleanup = function()
if badC3 then
if badC3.y >590 then
badC3:removeSelf()
badC3 = nil
end
end
end
Runtime:addEventListener("enterFrame", cleanup)
end
randomBadC3 = timer.performWithDelay( math.random(1000, 5000), randomBad3, 0 )
--
if badC3 then
badC3:removeSelf()
badC3 = nil
end
it only removes the last spawned one, not all of them
Add all images into one group when you want to delete delete entire group.
for i=1,#maingroup do
if maingroup[i] then
maingroup[i]:removeSelf();maingroup[i]=nil
end
end
end
Hi for some reason corona is giving me this error: attempt to index global 'backC' (a nil value)
local randomBackC = function()
backC = display.newImage("Cloud"..tostring(math.random(1, 4))..".png")
backC.x = math.random (30, 450); backC.y = -20
physics.addBody( backC, { density=2.9, friction=0.5, bounce=0.7, radius=24 } )
end
timer.performWithDelay( 500, randomBackC, 0 )
end
local function cleanup()
if backC.y >100 then
backC:removeSelf()
end
end
Runtime:addEventListener("enterFrame", cleanup)
any ideas of what is causing this?
backC may be already removed because of the Runtime:addEventListener("enterFrame", cleanup)
enterFrame will call the cleanup() over and over again, so you have to remove the enterFrame after you remove the backC and if you want to create multiple objects, make it local only to the function because it may cause referencing problem.
Like this
local randomBackC = function()
local backC = display.newImage("Cloud"..tostring(math.random(1, 4))..".png")
backC.x = math.random (30, 450); backC.y = -20
physics.addBody( backC, { density=2.9, friction=0.5, bounce=0.7, radius=24 } )
local cleanup
cleanup = function()
if backC then
if backC.y >100 then
backC:removeSelf()
backC = nil
Runtime:removeEventListener("enterFrame", cleanup)
end
end
end
Runtime:addEventListener("enterFrame", cleanup)
end
timer.performWithDelay( 500, randomBackC, 0 )