From: jcb@... (MetalOne)
Date: 2003-05-13T08:48:13+09:00
Subject: Ruby/Tk how to display a raw image residing in RAM.

I have an image stored as an array of RGB tuples.
8 bits for each of red, green, and blue.

I would like to use Tk to display it.
I am completely clueless.

I have looked at the Tk documentation and found the following functions:
Tk_PhotoBlank
Tk_PhotoExpand
Tk_PhotoGetImage
Tk_PhotoGetSize
Tk_PhotoPutBlock
Tk_PhotoPutZoomedBlock
Tk_PhotoPhotoSetSize

The Tk documentation is limited with no examples, so I don't know how
to do it in Tcl/Tk.

I can't figure out the Ruby bindings either.
It appears that there is simply
TkPhotoImage

I found a nice example using TkPhotoImage to load from file:
image = TkPhotoImage.new() { file "javaguy.gif" }
label = TkLabel.new(root) { image image; height 50 }.pack("anchor"=>"e")

I looked at the Ruby/Tk bindings source code for a while.
I couldn't figure out how the file() function was mapped, much less the
other functions.

Any help here would be appreciated.