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> a Space Invaders game > a minimal roguelike in Forth > 3-D rotating objects in ASCII art in 20 lines of Python > an RPN calculator with forward-mode automa

> a Space Invaders game > a minimal roguelike in Forth > 3-D rotating objects in ASCII art in 20 lines of Python > an RPN calculator with forward-mode automatic differentiation Those all sound pretty cool. Are those in the link you provided? I'd be interested in seeing how you did the 3-D rotations in only 20 lines, or what a minimal roguelike in Forth would look like.

kragen 2y ago
Thanks! Two of them are there! Or, sort of, three of them. The Space Invaders game is http://canonical.org/~kragen/sw/dev3/qvaders.html http://canonical.org/~kragen/sw/dev3/qvaders.html, built on the game engine in http://canonical.org/~kragen/sw/dev3/qj2d.js http://canonical.org/~kragen/sw/dev3/qj2d.js. An earlier version without the engine, the explosions, or the Xbox support is at http://canonical.org/~kragen/sw/dev3/invaders.html http://canonical.org/~kragen/sw/dev3/invaders.html. The minimal roguelike is http://canonical.org/~kragen/sw/dev3/wmaze.fs http://canonical.org/~kragen/sw/dev3/wmaze.fs. It runs in a few different Forths (GForth is probably the easiest) but I haven't ported it to F83 yet. There's an asciicast at https://asciinema.org/a/672405 https://asciinema.org/a/672405. I'm kind of a novice at Forth, so I might not be doing things in the best way. The ASCII-art rotating cube is http://canonical.org/~kragen/sw/netbook-misc-devel/rotcube.py http://canonical.org/~kragen/sw/netbook-misc-devel/rotcube.p.... It's actually only 15 lines of Python. A longer wireframe Unicode braille version is at http://canonical.org/~kragen/sw/dev3/braillecube.py http://canonical.org/~kragen/sw/dev3/braillecube.py with an asciicast at https://asciinema.org/a/390271 https://asciinema.org/a/390271. There's also a 41-line C++ ASCII-art version at http://canonical.org/~kragen/sw/dev3/rotcube.cpp http://canonical.org/~kragen/sw/dev3/rotcube.cpp and a 42-line semi-wireframe C version using my graphics library Yeso at https://gitlab.com/kragen/bubbleos/-/blob/master/yeso/cube.c https://gitlab.com/kragen/bubbleos/-/blob/master/yeso/cube.c. The RPN calculator is at http://canonical.org/~kragen/sw/81hacks/autodiffgraph/ http://canonical.org/~kragen/sw/81hacks/autodiffgraph/.
- trealira 2y ago
  Thanks! I upvoted you but forgot to reply. Those are as interesting as I thought they'd be.
  - kragen 2y ago
    Awesome, I'm glad you liked them! I probably should have said in my original comment that the 3-D rotation itself was only 3 of the 15 lines: s = 0.1 # sine c = (1 - s**2)**0.5 # cosine ... cube = [(c*x + s*z, y, -s*x + c*z) for x, y, z in cube] # Rotate by theta. The rest was ASCII art, animation, perspective projection, and geometry generation.

kragen 2y ago

Thanks! Two of them are there! Or, sort of, three of them. The Space Invaders game is http://canonical.org/~kragen/sw/dev3/qvaders.html http://canonical.org/~kragen/sw/dev3/qvaders.html, built on the game engine in http://canonical.org/~kragen/sw/dev3/qj2d.js http://canonical.org/~kragen/sw/dev3/qj2d.js. An earlier version without the engine, the explosions, or the Xbox support is at http://canonical.org/~kragen/sw/dev3/invaders.html http://canonical.org/~kragen/sw/dev3/invaders.html. The minimal roguelike is http://canonical.org/~kragen/sw/dev3/wmaze.fs http://canonical.org/~kragen/sw/dev3/wmaze.fs. It runs in a few different Forths (GForth is probably the easiest) but I haven't ported it to F83 yet. There's an asciicast at https://asciinema.org/a/672405 https://asciinema.org/a/672405. I'm kind of a novice at Forth, so I might not be doing things in the best way. The ASCII-art rotating cube is http://canonical.org/~kragen/sw/netbook-misc-devel/rotcube.py http://canonical.org/~kragen/sw/netbook-misc-devel/rotcube.p.... It's actually only 15 lines of Python. A longer wireframe Unicode braille version is at http://canonical.org/~kragen/sw/dev3/braillecube.py http://canonical.org/~kragen/sw/dev3/braillecube.py with an asciicast at https://asciinema.org/a/390271 https://asciinema.org/a/390271. There's also a 41-line C++ ASCII-art version at http://canonical.org/~kragen/sw/dev3/rotcube.cpp http://canonical.org/~kragen/sw/dev3/rotcube.cpp and a 42-line semi-wireframe C version using my graphics library Yeso at https://gitlab.com/kragen/bubbleos/-/blob/master/yeso/cube.c https://gitlab.com/kragen/bubbleos/-/blob/master/yeso/cube.c. The RPN calculator is at http://canonical.org/~kragen/sw/81hacks/autodiffgraph/ http://canonical.org/~kragen/sw/81hacks/autodiffgraph/.

trealira 2y ago
Thanks! I upvoted you but forgot to reply. Those are as interesting as I thought they'd be.
- kragen 2y ago
  Awesome, I'm glad you liked them! I probably should have said in my original comment that the 3-D rotation itself was only 3 of the 15 lines: s = 0.1 # sine c = (1 - s**2)**0.5 # cosine ... cube = [(c*x + s*z, y, -s*x + c*z) for x, y, z in cube] # Rotate by theta. The rest was ASCII art, animation, perspective projection, and geometry generation.