To play this game you need the ocaml-chipmunk bindings version 0.04.2:

http://decapode314.free.fr/ocaml/chipmunk/downloads/ocaml-chipmunk-0.04.2.tar.gz

(Don't take a more recent version, the API is not compatible anymore.)

And the graphics rendering is made through the ocaml-opengl bindings glMLite:

http://decapode314.free.fr/ocaml/GL/

The path set in rolling_moon.ml expect that these 2 dependencies are installed in /tmp, if you put it in another directory, then change the path set with #directory in rolling_moon.ml.

Just run the command make run-int which will run the game.

Use the left and right arrows to rotate the level which makes move the avatar ball. The goal is to touch all the target green circles of the level.

While playing you can make pauses with the 'P' key, and you can restart the level with the 'Z' key, or go to the next level with 'N'.

You can also access the commands with a right clic in the window.

     -l  --level        level.data file (several ones can be given)
     -t  --texture      texture jpeg image
     -r  --resolution   size of the window, for exemple "640x480" (the default)
     -w  --wireframe    minimal rendering for slow machines
     -b  --no-bg        in textured mode, only fills the level,
                        but not the background (for Mesa users)

Creating new levels is not very difficult. You can use the SVG editor Inkscape to create levels in WYSIWYG. The easiest way is probably to edit an existing one, and to modify it, then save it. Then convert the SVG source in binary level data with:

  sh mk_level_data.sh level.x.svg level.x.data

Then just load it in the game with:

  ocaml -w -6 rolling_moon.ml -l level.x.data

If you prefer to create one from scratch, here is how to do: you need to add a class argument to the element to tell its type. You can do so in the XML editor of Inkscape. For the avatar (at its initial position) add class="avatar". For level parts add class="level", for the targets add class="target".

For the level paths it need to be not closed, and bezier curves are not recognised yet.

If the tesselation of paths that are inside another path is not as expected, you may need to use "path > invert" in the Inkscape menu, with the related path selected.

Send them to me <monnier.florent (at) gmail.com> and I will include these.

Rolling-Moon is inspired by the SNES game "On The Ball" (its japaneese name was "CamelTry").

If you are interested you can see a video of "On The Ball" on youtube here:

http://fr.youtube.com/watch?v=CHS00nAgdk4

Have Fun!