I’ve not looked at this before and frankly I’m stumped as to why I can’t solve this problem, however it appears that the x,y location of a collision is either (a) incorrect or (b) relative to one of the objects involved in the collision. It’s just not clear which one. As demonstrated with the sample code here:
http://docs.coronalabs.com/api/event/collision/x.html
Does anyone have any light to shed on this?
Cheers,
Matt. [import]uid: 8271 topic_id: 31601 reply_id: 331601[/import]
Ah, I’m not the first to this problem, but it still appears persistent:
http://developer.coronalabs.com/forum/2012/07/13/collision-eventxeventy-inconsistent-newly-added-bodies [import]uid: 8271 topic_id: 31601 reply_id: 126237[/import]
Ah, I’m not the first to this problem, but it still appears persistent:
http://developer.coronalabs.com/forum/2012/07/13/collision-eventxeventy-inconsistent-newly-added-bodies [import]uid: 8271 topic_id: 31601 reply_id: 126237[/import]
Experiencing the same issue myself
Some screenshots:
Physics does not work on the actual object!
[](http://s1323.beta.photobucket.com/user/mercsten/library/)
Invisible object colliding with the sprite animation!
[](http://s1323.beta.photobucket.com/user/mercsten/library/)
I have a test sample project that isolates the problem (don’t know how to attach it in this thread though). I hope i’m just doing something wrong and this is not an actual bug . . . . bugs take time to resolve. [import]uid: 179529 topic_id: 31601 reply_id: 127302[/import]
Experiencing the same issue myself
Some screenshots:
Physics does not work on the actual object!
[](http://s1323.beta.photobucket.com/user/mercsten/library/)
Invisible object colliding with the sprite animation!
[](http://s1323.beta.photobucket.com/user/mercsten/library/)
I have a test sample project that isolates the problem (don’t know how to attach it in this thread though). I hope i’m just doing something wrong and this is not an actual bug . . . . bugs take time to resolve. [import]uid: 179529 topic_id: 31601 reply_id: 127302[/import]
bumpity . . . . bump bump [import]uid: 179529 topic_id: 31601 reply_id: 127575[/import]
bumpity . . . . bump bump [import]uid: 179529 topic_id: 31601 reply_id: 127575[/import]
Hi @merc,
Can you try to parse out at least some of your code and include it here within code tags? The screenshots would be helpful if you showed how you’re setting up your physics bodies, collision handler, etc… or at least, provide a detailed description on what’s going wrong.
Thanks!
Brent
[import]uid: 9747 topic_id: 31601 reply_id: 128303[/import]
Relevant code of the trial project:
-----------------------------------------------------------------------------------------
--
-- level1.lua
--
-----------------------------------------------------------------------------------------
local storyboard = require( "storyboard" )
local scene = storyboard.newScene()
local sprite = require ("sprite")
-- include Corona's "physics" library
local physics = require ("physics")
physics.start()
physics.pause()
physics.setGravity( 0, 0 ) -- no gravity vector
physics.setScale( 5 )
physics.setDrawMode( "hybrid" )
--------------------------------------------
-- forward declarations and other locals
local screenW, screenH, halfW, halfH = display.contentWidth, display.contentHeight, display.contentWidth\*0.5, display.contentHeight\*0.5
local bg
-----------------------------------------------------------------------------------------
-- BEGINNING OF YOUR IMPLEMENTATION
--
-- NOTE: Code outside of listener functions (below) will only be executed once,
-- unless storyboard.removeScene() is called.
--
-----------------------------------------------------------------------------------------
-- Called when the scene's view does not exist:
function scene:createScene( event )
local group = self.view
-- create a grey rectangle as the backdrop
bg = display.newImage("bg2.jpg",0,0)
bg:setReferencePoint( display.TopLeftReferencePoint )
bg.x, bg.y = 0, 0
local displayGroup = display.newGroup()
displayGroup:insert( bg )
displayGroup:setReferencePoint( display.TopLeftReferencePoint )
displayGroup.x, displayGroup.y = bg.x, bg.y
local activeGroup = display.newGroup()
local distanceTravelled = 4
local minX = 0
local maxX = bg.width
local minY = 0
local maxY = bg.height
local hasCollidedRight = false
local hasCollidedLeft = false
local hasCollidedBottom = false
local hasCollidedTop = false
local tapEventX = 0
local tapEventY = 0
-- filepath, width, height
local pteroSheet = sprite.newSpriteSheet("ptero.png",104, 50)
-- spritesheet, starting frame, number of frames
local pteroSet = sprite.newSpriteSet(pteroSheet, 1, 6 )
--spriteSet,sprite name, starting frame,# of frames,time in millis for a full animation,-2 for loop indefinite
sprite.add( pteroSet, "ptero", 1, 6, 300, -2 )
local ptero = sprite.newSprite( pteroSet )
local pteroShape = {-30,-30, 30,-30, 30,30, -30,30}
physics.addBody( ptero, {density=6.0, friction=0.3, bounce=0.0, shape=pteroShape} )
ptero.myName = "ptero"
ptero.x = screenW \* 0.5
ptero.y = screenH \* 0.25
ptero:prepare( "ptero" )
ptero:play()
activeGroup:insert(ptero)
local eventRect = display.newRect( 0, 0, bg.width, bg.height \*0.95)
--eventRect:setReferencePoint( display.TopLeftReferencePoint )
eventRect.strokeWidth = 2
eventRect.alpha = 0.01
eventRect:setStrokeColor(180,0,200)
displayGroup:insert( eventRect)
-- create a grass object and add physics (with custom shape)
local grass = display.newImageRect( "grass.png", screenW \*0.25, 82 )
--grass:setReferencePoint( display.TopLeftReferencePoint )
grass.x, grass.y = halfH, halfW
physics.addBody( grass, "static", {density=6.0, friction=0.3 } )
displayGroup:insert( grass )
-- all display objects must be inserted into group
group:insert( displayGroup )
group:insert( activeGroup)
local function onPteroFly(eventX,eventY)
-- unless when on the edges of the bg, ptero stays on the middle of the screen while sidescrolling
local function moveNextX()
if not hasCollidedRight then
if ptero.x \<= eventX then -- to the right
if (ptero.x ) \>= halfW then -- greater or equal than half screen size
if (displayGroup.x \>= -(maxX - screenW)) then --if less than the screen size of the max bg size from the right edge. bg is negative
displayGroup.x=displayGroup.x - distanceTravelled -- subtract bg and the event instead of adding values to ptero.x
eventX =eventX-distanceTravelled
else
ptero.x = ptero.x + distanceTravelled
end
else
ptero.x = ptero.x + distanceTravelled
end
else
-- done, so remove listener
Runtime:removeEventListener("enterFrame", moveNextX )
eventRect.isVisible=true
end
else
hasCollidedRight=false
ptero.x = ptero.x - distanceTravelled -- bump/move to the left a bit
Runtime:removeEventListener("enterFrame", moveNextX )
eventRect.isVisible=true
end
end
local function moveBackX()
if not hasCollidedLeft then
if ptero.x \>= eventX then -- to the left
if (ptero.x) \<= halfW then -- less or equal than half screen size
if (displayGroup.x \<= minX) then --if less than the screen size of the max bg size from the left edge. bg is negative
displayGroup.x=displayGroup.x + distanceTravelled -- add bg and the event instead of subtracting values to ptero.x
eventX =eventX+distanceTravelled
else
ptero.x = ptero.x - distanceTravelled
end
else
ptero.x = ptero.x - distanceTravelled
end
else
-- done, so remove listener
Runtime:removeEventListener("enterFrame", moveBackX )
eventRect.isVisible=true
end
else
hasCollidedLeft=false
ptero.x = ptero.x + distanceTravelled -- bump/move to the right a bit
Runtime:removeEventListener("enterFrame", moveBackX )
eventRect.isVisible=true
end
end
local function moveNextY()
if not hasCollidedBottom then
if ptero.y \<= eventY then -- to the bottom
if (ptero.y ) \>= halfH then -- greater or equal than half screen size.
if (displayGroup.y \>= -(maxY - screenH)) then --if less than the screen size of the max bg size from the bottom edge. bg is negative
displayGroup.y=displayGroup.y - distanceTravelled -- subtract bg and the event instead of adding values to ptero.y
eventY =eventY-distanceTravelled
else
ptero.y = ptero.y + distanceTravelled
end
else
ptero.y = ptero.y + distanceTravelled
end
else
-- done, so remove listener
Runtime:removeEventListener("enterFrame", moveNextY )
eventRect.isVisible=true
end
else
hasCollidedBottom=false
ptero.y = ptero.y - distanceTravelled -- bump/move to the up a bit
Runtime:removeEventListener("enterFrame", moveNextY )
eventRect.isVisible=true
end
end
local function moveBackY()
if not hasCollidedTop then
if ptero.y \>= eventY then -- to the top
if (ptero.y) \<= halfH then -- less or equal than half screen size
if (displayGroup.y \<= minY) then --if less than the screen size of the max bg size from the top edge. bg is negative
displayGroup.y=displayGroup.y + distanceTravelled -- add bg and the event instead of subtracting values to ptero.y
eventY =eventY+distanceTravelled
else
ptero.y = ptero.y - distanceTravelled
end
else
ptero.y = ptero.y - distanceTravelled
end
else
-- done, so remove listener
Runtime:removeEventListener("enterFrame", moveBackY )
eventRect.isVisible=true
end
else
hasCollidedTop=false
ptero.y = ptero.y + distanceTravelled -- bump/move to the down a bit
Runtime:removeEventListener("enterFrame", moveBackY )
eventRect.isVisible=true
end
end
eventRect.isVisible=false
if ptero.x \< eventX then
Runtime:removeEventListener("enterFrame", moveNextX )
ptero.xScale=1 -- the beak of ptero gives an indication of the left-right direction it is moving
Runtime:addEventListener("enterFrame", moveNextX )
else
Runtime:removeEventListener("enterFrame", moveBackX )
ptero.xScale=-1
Runtime:addEventListener("enterFrame", moveBackX)
end
if ptero.y \< eventY then
Runtime:removeEventListener("enterFrame", moveNextY )
ptero.yScale=-1 -- the right-side up/upside-down of ptero gives an indication of the up-down direction it is moving
Runtime:addEventListener("enterFrame", moveNextY )
else
Runtime:removeEventListener("enterFrame", moveBackY )
ptero.yScale=1
Runtime:addEventListener("enterFrame", moveBackY)
end
end
local function onTapEventRect(event)
onPteroFly(event.x,event.y)
tapEventX = event.x
tapEventY = event.y
end
local function onLocalCollision( self, event )
if ( event.phase == "began" ) then
if (self.myName == "ptero") then
--~ self.isBodyActive = false
if ptero.x \< tapEventX then
hasCollidedRight = true
print( self.myName .. ": collision going right" )
else
hasCollidedLeft = true
print( self.myName .. ": collision going left" )
end
if ptero.y \< tapEventY then
hasCollidedBottom = true
print( self.myName .. ": collision going down" )
else
hasCollidedTop = true
print( self.myName .. ": collision going up" )
end
print( "\n Collision hasCollidedRight: " .. tostring(hasCollidedRight))
print( " Collision hasCollidedLeft: " .. tostring(hasCollidedLeft))
print( " Collision hasCollidedBottom: " .. tostring(hasCollidedBottom))
print( " Collision hasCollidedTop: " .. tostring(hasCollidedTop))
print( "\n Collision pterox: " .. ptero.x .. " tapEventX: " .. tapEventX)
print( " Collision pteroy: " .. ptero.y .. " tapEventY: " .. tapEventY)
end
elseif ( event.phase == "ended" ) then
end
return true
end
eventRect:addEventListener( "tap",onTapEventRect )
ptero.collision = onLocalCollision
ptero:addEventListener( "collision",ptero)
end
Sorry for the long post.
I’m using the “old” sprite api demo from here: http://leetr.com/posts/93/corona-sdk-tutorial-animated-sprite/
Thanks for taking the time bro! Looking forward to know what’s wrong! [import]uid: 179529 topic_id: 31601 reply_id: 128313[/import]
Hi @merc,
Can you try to parse out at least some of your code and include it here within code tags? The screenshots would be helpful if you showed how you’re setting up your physics bodies, collision handler, etc… or at least, provide a detailed description on what’s going wrong.
Thanks!
Brent
[import]uid: 9747 topic_id: 31601 reply_id: 128303[/import]
Relevant code of the trial project:
-----------------------------------------------------------------------------------------
--
-- level1.lua
--
-----------------------------------------------------------------------------------------
local storyboard = require( "storyboard" )
local scene = storyboard.newScene()
local sprite = require ("sprite")
-- include Corona's "physics" library
local physics = require ("physics")
physics.start()
physics.pause()
physics.setGravity( 0, 0 ) -- no gravity vector
physics.setScale( 5 )
physics.setDrawMode( "hybrid" )
--------------------------------------------
-- forward declarations and other locals
local screenW, screenH, halfW, halfH = display.contentWidth, display.contentHeight, display.contentWidth\*0.5, display.contentHeight\*0.5
local bg
-----------------------------------------------------------------------------------------
-- BEGINNING OF YOUR IMPLEMENTATION
--
-- NOTE: Code outside of listener functions (below) will only be executed once,
-- unless storyboard.removeScene() is called.
--
-----------------------------------------------------------------------------------------
-- Called when the scene's view does not exist:
function scene:createScene( event )
local group = self.view
-- create a grey rectangle as the backdrop
bg = display.newImage("bg2.jpg",0,0)
bg:setReferencePoint( display.TopLeftReferencePoint )
bg.x, bg.y = 0, 0
local displayGroup = display.newGroup()
displayGroup:insert( bg )
displayGroup:setReferencePoint( display.TopLeftReferencePoint )
displayGroup.x, displayGroup.y = bg.x, bg.y
local activeGroup = display.newGroup()
local distanceTravelled = 4
local minX = 0
local maxX = bg.width
local minY = 0
local maxY = bg.height
local hasCollidedRight = false
local hasCollidedLeft = false
local hasCollidedBottom = false
local hasCollidedTop = false
local tapEventX = 0
local tapEventY = 0
-- filepath, width, height
local pteroSheet = sprite.newSpriteSheet("ptero.png",104, 50)
-- spritesheet, starting frame, number of frames
local pteroSet = sprite.newSpriteSet(pteroSheet, 1, 6 )
--spriteSet,sprite name, starting frame,# of frames,time in millis for a full animation,-2 for loop indefinite
sprite.add( pteroSet, "ptero", 1, 6, 300, -2 )
local ptero = sprite.newSprite( pteroSet )
local pteroShape = {-30,-30, 30,-30, 30,30, -30,30}
physics.addBody( ptero, {density=6.0, friction=0.3, bounce=0.0, shape=pteroShape} )
ptero.myName = "ptero"
ptero.x = screenW \* 0.5
ptero.y = screenH \* 0.25
ptero:prepare( "ptero" )
ptero:play()
activeGroup:insert(ptero)
local eventRect = display.newRect( 0, 0, bg.width, bg.height \*0.95)
--eventRect:setReferencePoint( display.TopLeftReferencePoint )
eventRect.strokeWidth = 2
eventRect.alpha = 0.01
eventRect:setStrokeColor(180,0,200)
displayGroup:insert( eventRect)
-- create a grass object and add physics (with custom shape)
local grass = display.newImageRect( "grass.png", screenW \*0.25, 82 )
--grass:setReferencePoint( display.TopLeftReferencePoint )
grass.x, grass.y = halfH, halfW
physics.addBody( grass, "static", {density=6.0, friction=0.3 } )
displayGroup:insert( grass )
-- all display objects must be inserted into group
group:insert( displayGroup )
group:insert( activeGroup)
local function onPteroFly(eventX,eventY)
-- unless when on the edges of the bg, ptero stays on the middle of the screen while sidescrolling
local function moveNextX()
if not hasCollidedRight then
if ptero.x \<= eventX then -- to the right
if (ptero.x ) \>= halfW then -- greater or equal than half screen size
if (displayGroup.x \>= -(maxX - screenW)) then --if less than the screen size of the max bg size from the right edge. bg is negative
displayGroup.x=displayGroup.x - distanceTravelled -- subtract bg and the event instead of adding values to ptero.x
eventX =eventX-distanceTravelled
else
ptero.x = ptero.x + distanceTravelled
end
else
ptero.x = ptero.x + distanceTravelled
end
else
-- done, so remove listener
Runtime:removeEventListener("enterFrame", moveNextX )
eventRect.isVisible=true
end
else
hasCollidedRight=false
ptero.x = ptero.x - distanceTravelled -- bump/move to the left a bit
Runtime:removeEventListener("enterFrame", moveNextX )
eventRect.isVisible=true
end
end
local function moveBackX()
if not hasCollidedLeft then
if ptero.x \>= eventX then -- to the left
if (ptero.x) \<= halfW then -- less or equal than half screen size
if (displayGroup.x \<= minX) then --if less than the screen size of the max bg size from the left edge. bg is negative
displayGroup.x=displayGroup.x + distanceTravelled -- add bg and the event instead of subtracting values to ptero.x
eventX =eventX+distanceTravelled
else
ptero.x = ptero.x - distanceTravelled
end
else
ptero.x = ptero.x - distanceTravelled
end
else
-- done, so remove listener
Runtime:removeEventListener("enterFrame", moveBackX )
eventRect.isVisible=true
end
else
hasCollidedLeft=false
ptero.x = ptero.x + distanceTravelled -- bump/move to the right a bit
Runtime:removeEventListener("enterFrame", moveBackX )
eventRect.isVisible=true
end
end
local function moveNextY()
if not hasCollidedBottom then
if ptero.y \<= eventY then -- to the bottom
if (ptero.y ) \>= halfH then -- greater or equal than half screen size.
if (displayGroup.y \>= -(maxY - screenH)) then --if less than the screen size of the max bg size from the bottom edge. bg is negative
displayGroup.y=displayGroup.y - distanceTravelled -- subtract bg and the event instead of adding values to ptero.y
eventY =eventY-distanceTravelled
else
ptero.y = ptero.y + distanceTravelled
end
else
ptero.y = ptero.y + distanceTravelled
end
else
-- done, so remove listener
Runtime:removeEventListener("enterFrame", moveNextY )
eventRect.isVisible=true
end
else
hasCollidedBottom=false
ptero.y = ptero.y - distanceTravelled -- bump/move to the up a bit
Runtime:removeEventListener("enterFrame", moveNextY )
eventRect.isVisible=true
end
end
local function moveBackY()
if not hasCollidedTop then
if ptero.y \>= eventY then -- to the top
if (ptero.y) \<= halfH then -- less or equal than half screen size
if (displayGroup.y \<= minY) then --if less than the screen size of the max bg size from the top edge. bg is negative
displayGroup.y=displayGroup.y + distanceTravelled -- add bg and the event instead of subtracting values to ptero.y
eventY =eventY+distanceTravelled
else
ptero.y = ptero.y - distanceTravelled
end
else
ptero.y = ptero.y - distanceTravelled
end
else
-- done, so remove listener
Runtime:removeEventListener("enterFrame", moveBackY )
eventRect.isVisible=true
end
else
hasCollidedTop=false
ptero.y = ptero.y + distanceTravelled -- bump/move to the down a bit
Runtime:removeEventListener("enterFrame", moveBackY )
eventRect.isVisible=true
end
end
eventRect.isVisible=false
if ptero.x \< eventX then
Runtime:removeEventListener("enterFrame", moveNextX )
ptero.xScale=1 -- the beak of ptero gives an indication of the left-right direction it is moving
Runtime:addEventListener("enterFrame", moveNextX )
else
Runtime:removeEventListener("enterFrame", moveBackX )
ptero.xScale=-1
Runtime:addEventListener("enterFrame", moveBackX)
end
if ptero.y \< eventY then
Runtime:removeEventListener("enterFrame", moveNextY )
ptero.yScale=-1 -- the right-side up/upside-down of ptero gives an indication of the up-down direction it is moving
Runtime:addEventListener("enterFrame", moveNextY )
else
Runtime:removeEventListener("enterFrame", moveBackY )
ptero.yScale=1
Runtime:addEventListener("enterFrame", moveBackY)
end
end
local function onTapEventRect(event)
onPteroFly(event.x,event.y)
tapEventX = event.x
tapEventY = event.y
end
local function onLocalCollision( self, event )
if ( event.phase == "began" ) then
if (self.myName == "ptero") then
--~ self.isBodyActive = false
if ptero.x \< tapEventX then
hasCollidedRight = true
print( self.myName .. ": collision going right" )
else
hasCollidedLeft = true
print( self.myName .. ": collision going left" )
end
if ptero.y \< tapEventY then
hasCollidedBottom = true
print( self.myName .. ": collision going down" )
else
hasCollidedTop = true
print( self.myName .. ": collision going up" )
end
print( "\n Collision hasCollidedRight: " .. tostring(hasCollidedRight))
print( " Collision hasCollidedLeft: " .. tostring(hasCollidedLeft))
print( " Collision hasCollidedBottom: " .. tostring(hasCollidedBottom))
print( " Collision hasCollidedTop: " .. tostring(hasCollidedTop))
print( "\n Collision pterox: " .. ptero.x .. " tapEventX: " .. tapEventX)
print( " Collision pteroy: " .. ptero.y .. " tapEventY: " .. tapEventY)
end
elseif ( event.phase == "ended" ) then
end
return true
end
eventRect:addEventListener( "tap",onTapEventRect )
ptero.collision = onLocalCollision
ptero:addEventListener( "collision",ptero)
end
Sorry for the long post.
I’m using the “old” sprite api demo from here: http://leetr.com/posts/93/corona-sdk-tutorial-animated-sprite/
Thanks for taking the time bro! Looking forward to know what’s wrong! [import]uid: 179529 topic_id: 31601 reply_id: 128313[/import]
So . . . . umm . . . . any suggestions? Are there any errors i need to correct? [import]uid: 179529 topic_id: 31601 reply_id: 129222[/import]
Hi @merc,
Sorry for the delay, I’m just swamped at the moment…
I haven’t dissected your entire code, but it generally looks OK. What I notice at first glance, however, is all of those “flags” … hasCollidedRight, hasCollidedLeft, etc. … have you checked and re-checked and RE-re-checked that all of those flags are being managed correctly (turned on and off when necessary, and every time)? I use flags alot to determine the “state” of something (many developers do, of course) and sometimes the most perplexing error is that I forgot to set a flag to T or F somewhere.
If you could just isolate this issue down to the bare bones of the collision event, that would help determine if it’s a collision bug or something else. What I mean is, set up just two objects and the listener and send your “ptero” flying into it, and see if you get a response… no flag switching, no back-and-forth Runtime listeners being turned on and off, etc… just the collision code.
Thanks for your patience!
Brent
[import]uid: 9747 topic_id: 31601 reply_id: 129241[/import]
So . . . . umm . . . . any suggestions? Are there any errors i need to correct? [import]uid: 179529 topic_id: 31601 reply_id: 129222[/import]
Hi @merc,
Sorry for the delay, I’m just swamped at the moment…
I haven’t dissected your entire code, but it generally looks OK. What I notice at first glance, however, is all of those “flags” … hasCollidedRight, hasCollidedLeft, etc. … have you checked and re-checked and RE-re-checked that all of those flags are being managed correctly (turned on and off when necessary, and every time)? I use flags alot to determine the “state” of something (many developers do, of course) and sometimes the most perplexing error is that I forgot to set a flag to T or F somewhere.
If you could just isolate this issue down to the bare bones of the collision event, that would help determine if it’s a collision bug or something else. What I mean is, set up just two objects and the listener and send your “ptero” flying into it, and see if you get a response… no flag switching, no back-and-forth Runtime listeners being turned on and off, etc… just the collision code.
Thanks for your patience!
Brent
[import]uid: 9747 topic_id: 31601 reply_id: 129241[/import]
Hi Brent,
Thanks for the advice. I removed all the “hasCollided…” flags, redundant add/remove EventListeners and removed all the contents of the localCollisionEvent except for a single print line. And so far . . . . both collision errors STILL occurs.
Btw, i’m running this on Windows XP using Corona Simulator 2012.894. Maybe this info would help. I have no access to the current daily builds - yet.
-----------------------------------------------------------------------------------------
--
-- level1.lua
--
-----------------------------------------------------------------------------------------
local storyboard = require( "storyboard" )
local scene = storyboard.newScene()
local sprite = require ("sprite")
-- include Corona's "physics" library
local physics = require ("physics")
physics.start()
physics.pause()
physics.setGravity( 0, 0 ) -- no gravity vector
physics.setScale( 5 )
physics.setDrawMode( "hybrid" )
--------------------------------------------
-- forward declarations and other locals
local screenW, screenH, halfW, halfH = display.contentWidth, display.contentHeight, display.contentWidth\*0.5, display.contentHeight\*0.5
local bg
-----------------------------------------------------------------------------------------
-- BEGINNING OF YOUR IMPLEMENTATION
--
-- NOTE: Code outside of listener functions (below) will only be executed once,
-- unless storyboard.removeScene() is called.
--
-----------------------------------------------------------------------------------------
-- Called when the scene's view does not exist:
function scene:createScene( event )
local group = self.view
-- create a grey rectangle as the backdrop
bg = display.newImage("bg2.jpg",0,0)
bg:setReferencePoint( display.TopLeftReferencePoint )
bg.x, bg.y = 0, 0
local displayGroup = display.newGroup()
displayGroup:insert( bg )
displayGroup:setReferencePoint( display.TopLeftReferencePoint )
displayGroup.x, displayGroup.y = bg.x, bg.y
local activeGroup = display.newGroup()
local distanceTravelled = 4
local minX = 0
local maxX = bg.width
local minY = 0
local maxY = bg.height
-- filepath, width, height
local pteroSheet = sprite.newSpriteSheet("ptero.png",104, 50)
-- spritesheet, starting frame, number of frames
local pteroSet = sprite.newSpriteSet(pteroSheet, 1, 6 )
--spriteSet,sprite name, starting frame,# of frames,time in millis for a full animation,-2 for loop indefinite
sprite.add( pteroSet, "ptero", 1, 6, 300, -2 )
local ptero = sprite.newSprite( pteroSet )
local pteroShape = {-30,-30, 30,-30, 30,30, -30,30}
physics.addBody( ptero, {density=6.0, friction=0.3, bounce=0.0, shape=pteroShape} )
ptero.myName = "ptero"
ptero.x = screenW \* 0.5
ptero.y = screenH \* 0.25
ptero:prepare( "ptero" )
ptero:play()
activeGroup:insert(ptero)
local eventRect = display.newRect( 0, 0, bg.width, bg.height \*0.95)
eventRect.strokeWidth = 2
eventRect.alpha = 0.01
eventRect:setStrokeColor(180,0,200)
displayGroup:insert( eventRect)
-- create a grass object and add physics (with custom shape)
local grass = display.newImageRect( "grass.png", screenW \*0.25, 82 )
grass.x, grass.y = halfH, halfW
physics.addBody( grass, "static", {density=3.0, friction=0.3 } )
displayGroup:insert( grass )
-- all display objects must be inserted into group
group:insert( displayGroup )
group:insert( activeGroup)
local function onPteroFly(eventX,eventY)
-- unless when on the edges of the bg, ptero stays on the middle of the screen while sidescrolling
local function moveNextX() -- going right
--print("NextX eventX: " .. eventX .. " pteroX:" .. ptero.x .. " displayGroup.x: " .. displayGroup.x .. " maxX: " .. maxX)
if ptero.x \<= eventX then
if (ptero.x ) \>= halfW then -- greater or equal than half screen width size
if (displayGroup.x \>= -(maxX - screenW)) then --if less than the screen size of the max bg size from the right edge.
displayGroup.x=displayGroup.x - distanceTravelled -- subtract bg and the event instead of adding values to ptero.x
eventX =eventX-distanceTravelled
else
ptero.x = ptero.x + distanceTravelled
end
else
ptero.x = ptero.x + distanceTravelled
end
else
-- done, so remove listener
Runtime:removeEventListener("enterFrame", moveNextX )
eventRect.isVisible=true
end
end
local function moveBackX() -- going left
--print("BackX eventX: " .. eventX .. " pteroX:" .. ptero.x .. " displayGroup.x: " .. displayGroup.x .. " minX: " .. minX)
if ptero.x \>= eventX then
if (ptero.x) \<= halfW then -- less or equal than half screen width size
if (displayGroup.x \<= minX) then --if less than the screen size of the max bg size from the left edge.
displayGroup.x=displayGroup.x + distanceTravelled -- add bg and the event instead of subtracting values to ptero.x
eventX =eventX+distanceTravelled
else
ptero.x = ptero.x - distanceTravelled
end
else
ptero.x = ptero.x - distanceTravelled
end
else
-- done, so remove listener
Runtime:removeEventListener("enterFrame", moveBackX )
eventRect.isVisible=true
end
end
local function moveNextY() -- going down
--print("NextY eventY: " .. eventY .." pteroY:" .. ptero.y .. " displayGroup.y: " .. displayGroup.y .. " maxY: " .. maxY)
if ptero.y \<= eventY then
if (ptero.y ) \>= halfH then -- greater or equal than half screen height size.
if (displayGroup.y \>= -(maxY - screenH)) then --if less than the screen size of the max bg size from the bottom edge.
displayGroup.y=displayGroup.y - distanceTravelled -- subtract bg and the eventY instead of adding values to ptero.y
eventY =eventY-distanceTravelled
else
ptero.y = ptero.y + distanceTravelled
end
else
ptero.y = ptero.y + distanceTravelled
end
else
-- done, so remove listener
Runtime:removeEventListener("enterFrame", moveNextY )
eventRect.isVisible=true
end
end
local function moveBackY() -- going up
--print("BackY eventY: " .. eventY .. " pteroY:" .. ptero.y .. " displayGroup.y: " .. displayGroup.y .. " minY: " .. minY)
if ptero.y \>= eventY then
if (ptero.y) \<= halfH then -- less or equal than half screen height size
if (displayGroup.y \<= minY) then --if less than the screen size of the max bg size from the top edge.
displayGroup.y=displayGroup.y + distanceTravelled -- add bg and the eventY instead of subtracting values to ptero.y
eventY =eventY+distanceTravelled
else
ptero.y = ptero.y - distanceTravelled
end
else
ptero.y = ptero.y - distanceTravelled
end
else
-- done, so remove listener
Runtime:removeEventListener("enterFrame", moveBackY )
eventRect.isVisible=true
end
end
--Determines which local function to attach to the Runtime Event Listener
eventRect.isVisible=false
if ptero.x \< eventX then
ptero.xScale=1 -- the beak of ptero gives an indication of the left-right direction it is moving
Runtime:addEventListener("enterFrame", moveNextX )
else
ptero.xScale=-1
Runtime:addEventListener("enterFrame", moveBackX)
end
if ptero.y \< eventY then
ptero.yScale=-1 -- the right-side up/upside-down of ptero gives an indication of the up-down direction it is moving
Runtime:addEventListener("enterFrame", moveNextY )
else
ptero.yScale=1
Runtime:addEventListener("enterFrame", moveBackY)
end
end
local function onTapEventRect(event)
onPteroFly(event.x,event.y)
end
local function onLocalCollision( self, event )
print( "\n Collision Detected \n")
end
eventRect:addEventListener( "tap",onTapEventRect )
ptero.collision = onLocalCollision
ptero:addEventListener( "collision",ptero)
end
-- Called immediately after scene has moved onscreen:
function scene:enterScene( event )
local group = self.view
physics.start()
end
-- Called when scene is about to move offscreen:
function scene:exitScene( event )
local group = self.view
physics.stop()
end
-- If scene's view is removed, scene:destroyScene() will be called just prior to:
function scene:destroyScene( event )
local group = self.view
package.loaded[physics] = nil
physics = nil
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
Thanks again!,
merc
[import]uid: 179529 topic_id: 31601 reply_id: 129325[/import]
Hi Brent,
Thanks for the advice. I removed all the “hasCollided…” flags, redundant add/remove EventListeners and removed all the contents of the localCollisionEvent except for a single print line. And so far . . . . both collision errors STILL occurs.
Btw, i’m running this on Windows XP using Corona Simulator 2012.894. Maybe this info would help. I have no access to the current daily builds - yet.
-----------------------------------------------------------------------------------------
--
-- level1.lua
--
-----------------------------------------------------------------------------------------
local storyboard = require( "storyboard" )
local scene = storyboard.newScene()
local sprite = require ("sprite")
-- include Corona's "physics" library
local physics = require ("physics")
physics.start()
physics.pause()
physics.setGravity( 0, 0 ) -- no gravity vector
physics.setScale( 5 )
physics.setDrawMode( "hybrid" )
--------------------------------------------
-- forward declarations and other locals
local screenW, screenH, halfW, halfH = display.contentWidth, display.contentHeight, display.contentWidth\*0.5, display.contentHeight\*0.5
local bg
-----------------------------------------------------------------------------------------
-- BEGINNING OF YOUR IMPLEMENTATION
--
-- NOTE: Code outside of listener functions (below) will only be executed once,
-- unless storyboard.removeScene() is called.
--
-----------------------------------------------------------------------------------------
-- Called when the scene's view does not exist:
function scene:createScene( event )
local group = self.view
-- create a grey rectangle as the backdrop
bg = display.newImage("bg2.jpg",0,0)
bg:setReferencePoint( display.TopLeftReferencePoint )
bg.x, bg.y = 0, 0
local displayGroup = display.newGroup()
displayGroup:insert( bg )
displayGroup:setReferencePoint( display.TopLeftReferencePoint )
displayGroup.x, displayGroup.y = bg.x, bg.y
local activeGroup = display.newGroup()
local distanceTravelled = 4
local minX = 0
local maxX = bg.width
local minY = 0
local maxY = bg.height
-- filepath, width, height
local pteroSheet = sprite.newSpriteSheet("ptero.png",104, 50)
-- spritesheet, starting frame, number of frames
local pteroSet = sprite.newSpriteSet(pteroSheet, 1, 6 )
--spriteSet,sprite name, starting frame,# of frames,time in millis for a full animation,-2 for loop indefinite
sprite.add( pteroSet, "ptero", 1, 6, 300, -2 )
local ptero = sprite.newSprite( pteroSet )
local pteroShape = {-30,-30, 30,-30, 30,30, -30,30}
physics.addBody( ptero, {density=6.0, friction=0.3, bounce=0.0, shape=pteroShape} )
ptero.myName = "ptero"
ptero.x = screenW \* 0.5
ptero.y = screenH \* 0.25
ptero:prepare( "ptero" )
ptero:play()
activeGroup:insert(ptero)
local eventRect = display.newRect( 0, 0, bg.width, bg.height \*0.95)
eventRect.strokeWidth = 2
eventRect.alpha = 0.01
eventRect:setStrokeColor(180,0,200)
displayGroup:insert( eventRect)
-- create a grass object and add physics (with custom shape)
local grass = display.newImageRect( "grass.png", screenW \*0.25, 82 )
grass.x, grass.y = halfH, halfW
physics.addBody( grass, "static", {density=3.0, friction=0.3 } )
displayGroup:insert( grass )
-- all display objects must be inserted into group
group:insert( displayGroup )
group:insert( activeGroup)
local function onPteroFly(eventX,eventY)
-- unless when on the edges of the bg, ptero stays on the middle of the screen while sidescrolling
local function moveNextX() -- going right
--print("NextX eventX: " .. eventX .. " pteroX:" .. ptero.x .. " displayGroup.x: " .. displayGroup.x .. " maxX: " .. maxX)
if ptero.x \<= eventX then
if (ptero.x ) \>= halfW then -- greater or equal than half screen width size
if (displayGroup.x \>= -(maxX - screenW)) then --if less than the screen size of the max bg size from the right edge.
displayGroup.x=displayGroup.x - distanceTravelled -- subtract bg and the event instead of adding values to ptero.x
eventX =eventX-distanceTravelled
else
ptero.x = ptero.x + distanceTravelled
end
else
ptero.x = ptero.x + distanceTravelled
end
else
-- done, so remove listener
Runtime:removeEventListener("enterFrame", moveNextX )
eventRect.isVisible=true
end
end
local function moveBackX() -- going left
--print("BackX eventX: " .. eventX .. " pteroX:" .. ptero.x .. " displayGroup.x: " .. displayGroup.x .. " minX: " .. minX)
if ptero.x \>= eventX then
if (ptero.x) \<= halfW then -- less or equal than half screen width size
if (displayGroup.x \<= minX) then --if less than the screen size of the max bg size from the left edge.
displayGroup.x=displayGroup.x + distanceTravelled -- add bg and the event instead of subtracting values to ptero.x
eventX =eventX+distanceTravelled
else
ptero.x = ptero.x - distanceTravelled
end
else
ptero.x = ptero.x - distanceTravelled
end
else
-- done, so remove listener
Runtime:removeEventListener("enterFrame", moveBackX )
eventRect.isVisible=true
end
end
local function moveNextY() -- going down
--print("NextY eventY: " .. eventY .." pteroY:" .. ptero.y .. " displayGroup.y: " .. displayGroup.y .. " maxY: " .. maxY)
if ptero.y \<= eventY then
if (ptero.y ) \>= halfH then -- greater or equal than half screen height size.
if (displayGroup.y \>= -(maxY - screenH)) then --if less than the screen size of the max bg size from the bottom edge.
displayGroup.y=displayGroup.y - distanceTravelled -- subtract bg and the eventY instead of adding values to ptero.y
eventY =eventY-distanceTravelled
else
ptero.y = ptero.y + distanceTravelled
end
else
ptero.y = ptero.y + distanceTravelled
end
else
-- done, so remove listener
Runtime:removeEventListener("enterFrame", moveNextY )
eventRect.isVisible=true
end
end
local function moveBackY() -- going up
--print("BackY eventY: " .. eventY .. " pteroY:" .. ptero.y .. " displayGroup.y: " .. displayGroup.y .. " minY: " .. minY)
if ptero.y \>= eventY then
if (ptero.y) \<= halfH then -- less or equal than half screen height size
if (displayGroup.y \<= minY) then --if less than the screen size of the max bg size from the top edge.
displayGroup.y=displayGroup.y + distanceTravelled -- add bg and the eventY instead of subtracting values to ptero.y
eventY =eventY+distanceTravelled
else
ptero.y = ptero.y - distanceTravelled
end
else
ptero.y = ptero.y - distanceTravelled
end
else
-- done, so remove listener
Runtime:removeEventListener("enterFrame", moveBackY )
eventRect.isVisible=true
end
end
--Determines which local function to attach to the Runtime Event Listener
eventRect.isVisible=false
if ptero.x \< eventX then
ptero.xScale=1 -- the beak of ptero gives an indication of the left-right direction it is moving
Runtime:addEventListener("enterFrame", moveNextX )
else
ptero.xScale=-1
Runtime:addEventListener("enterFrame", moveBackX)
end
if ptero.y \< eventY then
ptero.yScale=-1 -- the right-side up/upside-down of ptero gives an indication of the up-down direction it is moving
Runtime:addEventListener("enterFrame", moveNextY )
else
ptero.yScale=1
Runtime:addEventListener("enterFrame", moveBackY)
end
end
local function onTapEventRect(event)
onPteroFly(event.x,event.y)
end
local function onLocalCollision( self, event )
print( "\n Collision Detected \n")
end
eventRect:addEventListener( "tap",onTapEventRect )
ptero.collision = onLocalCollision
ptero:addEventListener( "collision",ptero)
end
-- Called immediately after scene has moved onscreen:
function scene:enterScene( event )
local group = self.view
physics.start()
end
-- Called when scene is about to move offscreen:
function scene:exitScene( event )
local group = self.view
physics.stop()
end
-- If scene's view is removed, scene:destroyScene() will be called just prior to:
function scene:destroyScene( event )
local group = self.view
package.loaded[physics] = nil
physics = nil
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
Thanks again!,
merc
[import]uid: 179529 topic_id: 31601 reply_id: 129325[/import]
Can you zip up your project (all Lua files and associated images or sprite sheets) and e-mail it to me? I can try it on my computer and see if it’s a platform (Mac vs. Windows) issue, or see what else might be happening.
brent (at) ignisdesign (dot) com
Thanks!
[import]uid: 9747 topic_id: 31601 reply_id: 129541[/import]
Can you zip up your project (all Lua files and associated images or sprite sheets) and e-mail it to me? I can try it on my computer and see if it’s a platform (Mac vs. Windows) issue, or see what else might be happening.
brent (at) ignisdesign (dot) com
Thanks!
[import]uid: 9747 topic_id: 31601 reply_id: 129541[/import]
Brent, I believe the code on the API doc page does not work as advertised…
http://docs.coronalabs.com/api/event/collision/x.html [import]uid: 8271 topic_id: 31601 reply_id: 129632[/import]