SimCity has just been released as free software under the GPL version 3 license (though the name has been changed to Micropolis for trademark reasons; it was the original working title). This was precipitated by the inclusion of SimCity on the One Laptop Per Child XO machines, but no reason the kids should have all the fun. Can't wait to see the SimCity hacks that emerge now:
The "MicropolisCore" project includes the latest Micropolis (SimCity) source code, cleaned up and recast into C++ classes, integrated into Python, using the wonderful SWIG interface generator tool. It also includes a Cairo based TileEngine, and a cellular automata machine CellEngine, which are independent but can be plugged together, so the tile engine can display cellular automata cells as well as SimCity tiles, or any other application's tiles.
The key thing here is to peek inside the mind of the original Maxis programmers when they built it. Remember, this was back in the day when games had to fit inside of 640k so some "creative" programming techniques were employed. SimCity has been long a model used for urban planning and while it's just a game, there are a lot of business rules, ecosystem modeling, social dependencies, and other cool stuff going on in this codebase. It may not be pretty code but it's content sure is interesting to see.
In any case, it's out there for you to grab and have fun with. It was originally written in C and of course is old (created before 1983 which is ancient in Internet time). Don spent a lot of time cleaning the code up (including ANSIfying it, reformatting it, optimizing, and bullet-proofing it) as best he could. Don ported the Mac version of SimCity to SunOS Unix running the NeWS window system about 15 years ago, writing the user interface in PostScript. A year or so later he ported it to various versions of Unix running X-Windows, using the TCL/Tk scripting language and gui toolkit. Several years later when Linux became viable, it was fairly straightforward to port that code to Linux, and then to port that to the OLPC.
Elan Lee and Matthew "The Oatmeal" Inman have run some of the world's most successful game Kickstarters, but for their latest, You've Got Crabs, they're just selling it the traditional way.
Press P to pray, or T to do nothing in secular fashion. See how many thoughts and prayers you can rack up before all the children are slaughtered!
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