Teodor Carstea wrote:
> look: I study C/C++ in the college, but Ruby I study by myself, I want 
> to write a first course program in Ruby(it was a C code of a shell 
> trajectory, launched by user's speed and angle). I've already written 
> the program in Ruby, it calculates the shell position at every period of 
> time.
> Therefore I need a piece of code which creates a window and point a 
> ball(it will be the shell). Any ideas?

"ruby game library" will be a useful google search, you'll find 
libraries like:
- gosu
- rubygame
- ruby/sdl
- star ruby
http://gpwiki.org/index.php/Ruby
This small page is not exhaustive but can get you started.
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