newbie - display library for lua - getting error

Unknown · February 2012

Newbie question - I loaded up an example that starts with:

Img_knob - display.newImage("knob.png")

and I get the error about 'attempt to index global 'display' (a nil value). I understand that this is because my version of Lua doesn't have the 'display' library? (it works fine in Corona).

If that's the right guess, where do I find, and how to I load up the library.

Thanks!

OZApps · February 2012

Hi Lauren,
display is a library that is available in C*SDK, for a quick look at how to start with Gideros, there was a tutorial I had written a while ago.

You can read it here http://howto.oz-apps.com/2011/11/options-to-create-mobile-apps.html

I am also working on a compatibility library (between my projects) that will allow you to just compile your C*SDK code with Gideros without any changes, but that will take a bit and not available now.

MikeHart · February 2012

Look unter bitmaps in the documentation and also in the samples. There is plenty of code to study and start with. The APIs of C*r*na are a little different, but Gideros is easy to understand and should get you running in no time.

Anyway, here is a tiny example on how to load an image and display it in the center of your canvas:

-- Create a new bitmap
local img = Bitmap.new(Texture.new("yourImage.png"))
-- Set the handle of it to its center
img:setAnchorPoint(0.5, 0.5)
-- Add the image as a child to the stage 
stage:addChild(img)
-- Set the position of the image to the center of the application canvas
img:setPosition(application:getContentWidth()/2, application:getContentHeight()/2)

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