I’m having fun with Composer but confused with making groups within the sceneGroup. I thought an object could only be in one group at a time.
Many of my objects are in this scene:create Group below.
function scene:create( event )
local sceneGroup = self.view
So, I thought I could change the x and y position using
sceneGroup.x = 30
sceneGroup.y = 400
It’s not working though and I figure it’s because it’s not the display.newGroup kind of group.
So, how would I do this?
An object can only be in one group at a time, however groups and be within other groups. You probably should not change the position of the sceneGroup through. I have a space shooter where my space ship is made up of multiple objects (5 different shield images, the ship itself, an animated flame coming out the back) and I make a “group” called ship that holds all of the parts. Then that group gets inserted into the scene’s group for management by the scene.
Rob
Thanks for the reply. My new group never shows on the screen which is why I didn’t think I could do what you describe.
I created a new group local vowelGroup and then insert that sceneGroup:insert(vowelGroup)
Take a look below. Suddenly those widgets don’t show up on the screen.
[lua]
– Called when the scene’s view does not exist:
function scene:create( event )
local sceneGroup = self.view
– Initialize the scene here.
– Example: add display objects to “sceneGroup”, add touch listeners, etc.
local vowelGroup = display.newGroup( )
sceneGroup:insert( vowelGroup )
–BACKGROUND
local bg = display.newImageRect(“images/BG_vowels.png”, 1024, 768)
bg.x = centerX
bg.y = centerY
sceneGroup:insert(bg)
–LOGO
Logo = display.newImageRect( “images/BB_logo.png”, 263, 211 )
Logo.x = display.contentWidth -915
Logo.y = display.contentHeight -90
Logo: scale( .5, .5 )
sceneGroup:insert(Logo)
–WIDGETS
local a_btn = widget.newButton
{
left = 203,
top = 110,
defaultFile = “images/a_red_btn_v.png”,
overFile = “images/a_red_btnPush_v.png”,
onEvent = play_a_btn
}
vowelGroup:insert(a_btn)
local e_btn = widget.newButton
{
left = 585,
top = 110,
defaultFile = “images/e_red_btn_v.png”,
overFile = “images/e_red_btnPush_v.png”,
onEvent = play_e_btn
}
vowelGroup:insert(e_btn)
[/lua]
Do you ever insert vowelGroup into sceneGroup?
Line 10 above shows:
sceneGroup:insert( vowelGroup )
That’s what’s strange. After I do that, the widgets just disappear.
For anyone else having this trouble, the new grouped objects are there but (using my code location above- line 10) they are sitting behind the background image.
So, by just cutting/pasting Line 10 toward the bottom of the code just before “end” of function scene:create, those objects in the new display group come to the foreground.
sceneGroup:insert( vowelGroup )
end
You have a layering problem. vowelGroup is inserted before bg, so it’s at the bottom of the stack. Simply move the sceneGroup:insert(vowelGroup) after you setup the background.
Thanks, Rob. That’s exactly it. The new Group just needed to be placed after the Background image. It need not be placed all the way at the bottom before “end” as I described it above.
So, then to remove the group under scene:destroy, do I just do this
vowelGroup:removeSelf()
vowelGroup = nil
An object can only be in one group at a time, however groups and be within other groups. You probably should not change the position of the sceneGroup through. I have a space shooter where my space ship is made up of multiple objects (5 different shield images, the ship itself, an animated flame coming out the back) and I make a “group” called ship that holds all of the parts. Then that group gets inserted into the scene’s group for management by the scene.
Rob
Thanks for the reply. My new group never shows on the screen which is why I didn’t think I could do what you describe.
I created a new group local vowelGroup and then insert that sceneGroup:insert(vowelGroup)
Take a look below. Suddenly those widgets don’t show up on the screen.
[lua]
– Called when the scene’s view does not exist:
function scene:create( event )
local sceneGroup = self.view
– Initialize the scene here.
– Example: add display objects to “sceneGroup”, add touch listeners, etc.
local vowelGroup = display.newGroup( )
sceneGroup:insert( vowelGroup )
–BACKGROUND
local bg = display.newImageRect(“images/BG_vowels.png”, 1024, 768)
bg.x = centerX
bg.y = centerY
sceneGroup:insert(bg)
–LOGO
Logo = display.newImageRect( “images/BB_logo.png”, 263, 211 )
Logo.x = display.contentWidth -915
Logo.y = display.contentHeight -90
Logo: scale( .5, .5 )
sceneGroup:insert(Logo)
–WIDGETS
local a_btn = widget.newButton
{
left = 203,
top = 110,
defaultFile = “images/a_red_btn_v.png”,
overFile = “images/a_red_btnPush_v.png”,
onEvent = play_a_btn
}
vowelGroup:insert(a_btn)
local e_btn = widget.newButton
{
left = 585,
top = 110,
defaultFile = “images/e_red_btn_v.png”,
overFile = “images/e_red_btnPush_v.png”,
onEvent = play_e_btn
}
vowelGroup:insert(e_btn)
[/lua]
Do you ever insert vowelGroup into sceneGroup?
Line 10 above shows:
sceneGroup:insert( vowelGroup )
That’s what’s strange. After I do that, the widgets just disappear.
For anyone else having this trouble, the new grouped objects are there but (using my code location above- line 10) they are sitting behind the background image.
So, by just cutting/pasting Line 10 toward the bottom of the code just before “end” of function scene:create, those objects in the new display group come to the foreground.
sceneGroup:insert( vowelGroup )
end
You have a layering problem. vowelGroup is inserted before bg, so it’s at the bottom of the stack. Simply move the sceneGroup:insert(vowelGroup) after you setup the background.
Thanks, Rob. That’s exactly it. The new Group just needed to be placed after the Background image. It need not be placed all the way at the bottom before “end” as I described it above.
So, then to remove the group under scene:destroy, do I just do this
vowelGroup:removeSelf()
vowelGroup = nil