This is a ros package for Novation Launchpad MK2 using python.
There are two nodes launchpad_node.py and launchpad_manager.py.
launchpad_node.py is a node commmunicate with the launchpad with pygame. To use this node please install pygame and its dependencies sdl1.2.
It will publish a topic launchpad_key_event on every key event. The msg LaunchpadKey contains x(uint), y(uint), keydown(bool) and type(string). Notice that x value means vertical and y value means horizontal starting from bottom left(0, 0).
It also subscribe color topics for lighting the launchpad. See content of launchpad_node.py, definations of .msg files, and Launchpad MK2 Programmers Reference Manual for more details.
launchpad_manager.py is a node using with launchpad_node.py provides higher level interfaces and functions for launchpad applications. It can support up to 4 modes and hide the buttons Session, User 1, User 2, Mixer for swiching mode. It can takes up to 4 arguments for user definded mode and overwrite from Srssion botton to Mixer botton. Please enter the full class path package.file.class for the arguments. A folder with a file __init__.py will be considered as a python package.
When the node starts, it will create all mode objects. Which means that init() of the mode classes will be call. It will also pass the mode number (0 to 3) as parameter. Whenever a mode is switched (and mode 0 just after startup) its start() function will be called, and pause() function of the old mode. Moreover, when a keyevent is recived, it will call execute() function of current mode and pass the LaunchpadKey object to it. See launchpad_manager.py and basic_mode.py for more details.
As metioned above, a mode should define __init__(self, modeNumber), start(self), pause(self), and execute(self, LaunchpadKey). Also, a mode is expected to handle its own color layout by pubulishing color related topics directly. BasicMode in basic_mode.py is already implemented color related functions. It is strongly recomand to inherit from BasicMode and overide exsisted functions when writing a new custom mode.