Iterating through display group and rotating objects

I have a display group that is filled with images, I need to be able to rotate each one of these objects inside a special function which will be part of the game loop so that the image is rotating.

I have not been able to find a way to iterate through all items in the display group like so:

for item in newDisplayGroup do
    if (item.type == "ball") then
        item.rotation = item.rotation + 5
    end
end

Hey there, here's an example I quickly wrote up for you - not the neatest but it works;

local localGroup = display.newGroup()
 
local rock1 = display.newImage("rock.png")
rock1.x = 50
rock1.y = 50
localGroup:insert( rock1 )
 
local rock2 = display.newImage("rock.png")
rock2.x = 100
rock2.y = 100
localGroup:insert( rock2 )
 
local rock3 = display.newImage("rock.png")
rock3.x = 150
rock3.y = 150
localGroup:insert( rock3 )
 
for i = 1, localGroup.numChildren do
        localGroup[i].rotation = localGroup[i].rotation + 5
end

PS - I didn't use an if statement in the example but you easily could, just to be clear :)

ahh thank you soo much. It looks like one of the big things I forgot was that Lua starts arrays at 1 and Python starts at 0.

Not a problem, I love questions where I can provide some simple code to help explain the solution :D

The whole 0/1 thing I know confuses a lot of people, I'm lucky because I didn't know any other languages before learning Lua - although if I learn others in the future I'm sure I'll make similar mistakes ;)

Peach :)

views:2079 update：2011/11/18 8:53:10


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