Howto:Add new fgcommands to FlightGear: Difference between revisions

Howto:Add new fgcommands to FlightGear (view source)

528 bytes added , 29 May 2013

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 An overview of fgcommands currently available and supported is provided in [http://gitorious.org/fg/fgdata/blobs/master/Docs/README.commands $FG_ROOT/Docs/README.commands].
-Creating a new fgcommand is fairly simple actually. The source code you need to look at is in [http://gitorious.org/fg/flightgear/blobs/next/src/Main/fg_commands.cxx $FG_SRC/Main/fg_commands.cxx].
+Beginning with FlightGear 2.11+, new fgcommands can now also be implemented in [[Nasal]] and registered through new Nasal extension functions:
+* '''addcommand(name, func)'''
+* '''removecommand(name)'''
+This allows you to make up new fgcommands just by implementing them in Nasal:
+<syntaxhighlight lang="php">
+addcommand("hello", func {
+ print("hello");
+});
+fgcommand("hello");
+</syntaxhighlight>
+Obviously, not all fgcommands can be implemented in Nasal, which is why you may sometimes still have to use C++ - creating a new fgcommand using C++ is also fairly simple actually. The source code you need to look at is in [http://gitorious.org/fg/flightgear/blobs/next/src/Main/fg_commands.cxx $FG_SRC/Main/fg_commands.cxx].