ImageLoader.lua

function setup()
    LoadImages() --do this first, on its own
end

function LoadImages()
    imageStatus='Ready' --tells draw it's ok to draw the scene (will be turned off if we have to download images)
    output.clear()
    --pass through Codea name of image and internet url
    --not in Codea, will be downloaded and saved
    img1=LoadImage('Dropbox:3D-tree',
            'http://i1303.photobucket.com/albums/ag142/ignatz_mouse/map-tree27c_zpsd56f4f5f.png')
    img2=LoadImage('SpaceCute:Background')
    img3=LoadImage('Dropbox:3D-wall',
            'http://i1303.photobucket.com/albums/ag142/ignatz_mouse/map-stonewall1_zps875ba0f0.png')
    if imageStatus=='Ready' then setup2() end
end

--downloads images one by one
function LoadImage(fileName,url)
        local i=readImage(fileName)
        if i~=nil then return i end
        --not found, we need to download, add to queue (ie table)
        if imageTable==nil then imageTable={} end
        imageTable[#imageTable+1]={name=fileName,url=url}
        print('Queueing',fileName)
        imageStatus='Loading'
        --if the first one, go ahead and download
        if #imageTable==1 then
            http.request(imageTable[1].url,ImageDownloaded)
            print('loading',imageTable[1].name)
        end
end

--saves downloaded images
function ImageDownloaded(img)
    print(imageTable[1].name,'loaded')
    saveImage(imageTable[1].name,img)  --save
    table.remove(imageTable,1)
    --load next one if we have any more to do
    if #imageTable>0 then
        http.request(imageTable[1].url,ImageDownloaded)
        print('loading',imageTable[1].name)
    else
        LoadImages()
    end
end