About the Simutrans Code

# Simutrans

- 1.0) About
  - 1.1) Download Simutrans
  - 1.2) Helpful links
- 2.0) Compiling Simutrans
  - 2.1) Getting the Source Code
  - 2.2) Getting the libraries
  - 2.3) Compiling
    - 2.3.1) Compiling with make
    - 2.3.2) Compiling with MSVC
    - 2.3.3) Compiling with CMake
  - 2.4) Cross-Compiling
- 3.0) Contribute
  - 3.1) Coding
  - 3.2) Getting the libraries
  - 3.3) Painting
  - 3.4) Reporting-bugs
- 4.0) License
- 5.0) Credits

## 1) About

Simutrans is a freeware and open-source transportation simulator. Your goal is to establish a successful transport company. Transport passengers, mail and goods by rail, road, ship, and even air. Interconnect districts, cities, public buildings, industries and tourist attractions by building a transport network you always dreamed of.

## 1.1) Download Simutrans

You can download Simutrans from:

- Simutrans Official Website
- Steam
- Linux package managers

There is a "nightly" version available, but most most people should use the last "stable" release.

## 1.2) Helpful links

### Main sites

- Main website
- International Forum
- German Forumurl
- Japanese Forum

### Help

- Simutrans Wiki
- Starter Guide (PDF)
- Help Center (International Forum)

### Additional downloads

- Paksets
- Addons

## 2) Compiling Simutrans

This is a short guide on compiling simutrans. If you want more detailed information, read the Compiling Simutrans wiki page.

If you are on Windows, download either Microsoft Visual Studio or MSYS2. MSVC is easy for debugging, MSYS2 is easy to set up (but it has to be done on the command line).

### 2.1) Getting the Source Code

You can download the latest version with a SVN client:

    svn checkout svn://servers.simutrans.org/simutrans/trunk

If you prefer to use git, there is a mirror of the svn repository available at github:

    git clone http://github.com/simutrans/simutrans.git

Note that the svn repository is the main repository, and the git repository is just a mirror. If you use git instead of svn, you will need to set the game version manually to join a network game.

### 2.2) Getting the libraries

This is a list of libraries used by Simutrans. Not all of them are necessary, some are optional, so pick them according to your needs. Read below about how to install them.

Library | Website | Necessary? | Notes
--- | --- | --- | ---
zlib | https://zlib.net/ | Necessary | Basic compression support
bzip2 | https://www.bzip.org/downloads.html | Necessary | Alternative compression. You can pick this or zstd
libpng | http://www.libpng.org/pub/png/ | Necessary | Image manipulation
libSDL2 | http://www.libsdl.org/ | Necessary* | *On Linux & Mac. Optional but recommended for Windows. Graphics back-end
libzstd | https://github.com/facebook/zstd | Optional | Alternative compression (larger save files than bzip2, but faster)
libfreetype | http://www.freetype.org/ | Necessary | TrueType font support
libminiupnpc | http://miniupnp.free.fr/ | Optional | Easy Server option
libfluidsynth | https://www.fluidsynth.org/ | Optional | MIDI playback recommended on Linux & temporarily on Mac
libSDL2_mixer | http://www.libsdl.org/ | Optional | Alternative MIDI playback and sound system
libfontconfig | https://www.fontconfig.org/ | Optional | Font autodetection (Linux/Mac)

You will also need pkgconfig (Unix) or vcpkg (Microsoft Visual C++)

- MSVC: Should compile the needed libraries automatically, if VCPKG is installed. Alternative, copy install-building-libs-.bat to the vcpkg folder and run it.
- MSYS2: Run [setup-mingw.sh] (tools/setup-mingw.sh) to get the libraries and set up the environment.
- Ubuntu/Debian: Run [setup-debian.sh] (tools/setup-debian.sh) to get the libraries and set up the environment.
- Linux: Use pkgs.org to search for development libraries available in your package manager.
- Mac: Install libraries via [Homebrew] (https://brew.sh/). Some guidance can be found in the github directory.

### 2.3) Compiling

Go to the source code directory of simutrans (simutrans/trunk if you downloaded from svn). You have three build systems to choose from: make, MSVC, and CMake. We recommend make or MSVC for debug builds, cmake for MacOS and Android.

Compiling will give you only the executable, you still need a Simutrans installation to run the program. You can start simutrans with `-use_workdir` to point it to an existing installation.

#### 2.3.1) Compiling with make

The executable will be built in build/default.

    (Linux) autoconf
    (MacOS) autoreconf -ivf
    ./configure
    make -j 4
    (MacOS) make OSX/getversion

#### 2.3.2) Compiling with Microsoft Visual Studio

Simutrans solution is a single solution file simutrans.sln with 4 projects:

- Simutrans-Main: The project that holds the shared, non back-end specific, files. All the followings use Main to build the specific back-end executables.
- Simutrans SDL2: Preferred back-end for Simutrans.
- Simutrans GDI: Windows-only back-end.
- Simutrans Server: Server back-end with no graphical interface.

Select on of them as startup project and in the configuration manager compile it.

#### 2.3.3) Compiling with CMake

The executable will be built in build/simutrans.

##### Commandline on Linux/MinGW/MacOS ...

    cmake -G "Insert Correct Makefiles Generator" -B build .
    cmake --build build -j 4

See here for a list of generators.

##### MSVC

    mkdir build && cd build
    cmake.exe .. -G "Visual Studio 16 2019" -A x64 -DCMAKE_TOOLCHAIN_FILE=[vcpkg-root]/scripts/buildsystems/vcpkg.cmake
    cmake --build . --config Release

### 2.4) Cross-Compiling

If you want to cross-compile Simutrans from Linux for Windows, see the Cross-Compiling Simutrans wiki page.

## 3) Contribute

You cand find general information about contributing to Simutrans in the Development Index of the wiki.

### 3.1) Coding

- If you want to contribute, read the coding guidelines in simutrans/documentation/coding_styles.txt
- You definitely should check out the Technical Documentation Sub-Forum as well.
- Do not open Pull Requests in GitHub. Use the Patches & Projects Sub-Forum instead.

### 3.2) Translating

Simutrans is constantly updating and adding texts so we are always in need for translators:

- To help with translation use the SimuTranslator web tool.
- To request a translator account use the Translation Sub-Forum.

### 3.3) Painting

Simutrans is always looking for artists! If you want to paint graphics for Simutrans, check:

- The "Creating images" section of the Development Index.
- The General Resources and Tools Sub-Forum.

### 3.4) Reporting bugs

For bug reports use the Bug Reports Sub-Forum.

## 4) License

Simutrans is licensed under the Artistic License version 1.0. The Artistic License 1.0 is an OSI-approved license which allows for use, distribution, modification, and distribution of modified versions, under the terms of the Artistic License 1.0. For the complete license text see LICENSE.txt.

Simutrans paksets (which are necessary to run the game) have their own license, but no one is included alongside this code.

## 5) Credits

Simutrans was originally written by Hansjörg Malthaner "Hajo" from 1997 until he retired from development around 2004. Since then a team of contributors (The Simutrans Team) lead by Markus Pristovsek "Prissi" is developing Simutrans.

A list of early contributors can be found in simutrans/thanks.txt