gave you the preferred answer below, but if you wanted to use my Canvas method, without invoking a window, all you need to do is comment out the line #MainLoop. Then if you run it, it will not show a window.
Either way, you are loading Tk. You can either load Tk::Text or a Tk::Canvas.
Tk is relatively light and fast to load.
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Want more info? How to link or
or How to display code and escape characters
are good places to start.