I was competing in rubyweekend #3 (72 hour game compo) this other week, and I "finished" a game in gosu/chipmunk/texplay .. you might wanna check it out, the readme follows:

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A Tiny World (28 Juni 2009)
============================
By: ippa (AT) rubylicio (dot) us / ippa @ #freenode
Entry for RubyWeekend #3 [http://rubygame.org/forums/viewtopic.php?f=8&t=38]

Packaged bundles
================
Windows: http://ippa.se/a_tiny_world.exe
OSX: http://ippa.se/a_tiny_world_intel_mac.zip
Linux: http://github.com/ippa/a_tiny_world/tree/master   ... :P

Game
====
Crush the minis and their world!
Bonus for kicking minis to death while in the air. Don't get bitten in the legs!
Move legs with Arrows. Kick with Space.

Thoughts
========
72 hours was abit long, I wasted 1-2 days in the sun and still started to get bored :p.
48 hours is probably enough.

Chipmunk-tweaking, especially syncing gfx to chipmunk-shapes, was hell and took alot of time.
I need to make a lib that solves this better and automaticly. Preferable via SVG-files.

Win32 Deployment with Ocra [http://github.com/larsch/ocra/tree/master] is cool.

I can't seem to find the perfect way of organizing levels... rubycode? singletonclass? yaml-files?

Actually taking time to work on alot of (easy) details, like simple bloodsplatter and various soundFX, really adds to
the final experience.

Requires
========
Gosu: http://www.libgosu.org/
- "gem install gosu"

Chipmunk: http://wiki.slembcke.net/main/published/Chipmunk
- You'll need edge from http://code.google.com/p/chipmunk-physics/

Texplay: http://banisterfiend.wordpress.com/2008/08/23/texplay-an-image-manipulation-tool-for-ruby-and-gosu/
- 0.1.4.5 works
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I'm probably gonna continue working on this when I get the time.. since it felt like it could become a really fun game.

hey

i really like your game and i think it has alot of potential but just a few things: 

(1) the TexPlay color param actually takes floats (in the range of 0.0 to 1.0) not ints, so you should probably change your code to: color [0.5, 0.5, 0.5] rather than color [100, 100, etc]

(2) i see you tried to splice in a bite image but then commented out that line. were you having trouble getting splice to do what you want? i use TexPlay's splice to do something similar in tremolo and i do it by creating an image 'mask' (i.e the shape i want is full alpha on a white background) and then splicing it in using the :mask => :alpha  hash arg to splice.

(3) also do you think youll make the back leg move realistically in a later version? (im sure its a pain in the ass to do that but it would be worth the effort for presentation purposes).

another thing; do you plan to make the levels bigger and add horizontal scrolling ? i dont know how far you want to take the game idea but i think it could work as a fully developed game if you wanted it to.

:)

banister

1) allright!

2) It spliced what I wanted.. I just played between the having a mini attach (splice) himself to the leg Or just leave a blody hole.. the miniattaching became more prune to looking bad in certain situations, mainly I think when chipmunks collisiondetection couldn't keep up with some fastpace movement.

.. Then Julian asked "why does minis leave a hole in the leg with red pixels hanging in the air?" .. HAH :)

so.. now the next idea is to paint a bigger red circle (the outlining blood), and then a smaller circle-hole inside it..

3) I pondered alot about the backleg
- having a key to switch leg you're controlling with the arrowkeys
- having a key to just jump the backleg forward a set length
- having it's own set of arrowkeys (A,D,S,W) for full controll of both legs at the same time.

.. It ended up the way it did cause I think simplicity (especially in a small game like this) is good.. shouldn't be advanced controlls to learn or master.. so the backleg just skips along when you move the front-leg forward and it hits a certain width between the 2 legs (and you still hold the left-arrow down). If anyone got a good idea, let's hear it :P

I actually started with horizontal scrolling in mind but was scrapped due to complexity / timelimit. It's most likely a cool idea.. with the legs reaching various places, buildings on his own, triggering mini-rushes and other stuff comming at him. I also have http://pastie.org/539916 ready-made :) very advanced ;)... I should add automatic z-order there.

Btw, thanks for the reply on your blog ... what should I compile with? mingw? microsoft visual studio express? extconf.rb currently fails me cause it can't find winsock2.h, which I have, I'm just not sure how to tell extconf.rb where it is :)

Another question.. if you look at the gosu-sample "RMagickIntegration.rb".. the dynamic ground is fabolous, is texturefilling a (big) vector something that's alot of work to add in texplay? The example also make it even prettier by darkening the ground downwards... Alot of sidescrollers could use this.. I usually go for vectorgrounds/chipmunk and not plain horizontal tiles.

Kool game :)

Thanks for sharing!

would like to see you make it into a full game,as once I finished it I wanted more levels :)

i just compile using visual c++ 6.0 when im building on windows, using the same setup matz recommends for compiling ruby. not sure about using other windows compilers, i usually stay away from windows these days :) you can tell the compiler where to locate header files using the -I option though....

ill have to look at that imagemagick feature before i can comment, currently im away on holiday in new caledonia  :)

im actually concentrating on expanding the macro ability in TexPlay to let people extend the library themselves, if i can get macros to be fast enough i may even move the circle, line, box functions to rubyspace in the form of macros too. adding a darkening effect to TexPlay as a macro should be trivial though, even in TexPlay's current form you can make a darkening macro (though it'd maybe be a bit slow since you have to use get_pixel, the next version will provide an each_pixel iterator to the image class to speed things up a bit hopefully, im also going to play around with simd just for fun and to see if it gives a speed boost in some situations)

a simple macro to darken a pixel might look like this:

TexPlay.create_macro(:darken) { |x, y|
    clr = get_pixel(x, y)

    clr[0] /= 2    # red
    clr[1] /= 2    # green
    clr[2] /= 2    # blue

    color clr
    pixel(x, y)
}

and use like this: image.darken(10, 10)      to darken the pixel at (10, 10)

if using in a current version of TP you might need to put the pixel call in a paint block, newer versions dont require this.

hey just letting you know that flood-filling and bezier curves are coming to texplay, im just deciding on which algorithms to use

just saw you got 2nd place in the RubyWeekend competition for this game, congrats!
http://rubygame.org/forums/viewtopic.php?f=8&t=46

I think it would be a good idea to bundle the chipmunk.so with the Linux files... I haven't been able to compile it and can't try this game :(

Update
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Well, finally I could get the ruby extension working...
And nice minigame! I was finally able to try it. :)