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Classes | Variables
direct.tkpanels.FSMInspector Namespace Reference

## Classes
class | FSMInspector
class | StateInspector

## Variables
tuple | DELTA = (5.0 / 360.) * 2.0 * math.pi

## Detailed Description

    Defines the `FSMInspector` class, which opens a Tkinter window for
    inspecting :ref:`finite-state-machines`.

    Using the Finite State Inspector
    --------------------------------

    1) In your Config.prc add::

        want-tk #t

    2) Start up the show and create a Finite State Machine::

        from direct.showbase.ShowBaseGlobal import *

        from direct.fsm import ClassicFSM
        from direct.fsm import State

        def enterState():
            print('enterState')

        def exitState():
            print 'exitState'

        fsm = ClassicFSM.ClassicFSM('stopLight',
                  [State.State('red', enterState, exitState, ['green']),
                    State.State('yellow', enterState, exitState, ['red']),
                    State.State('green', enterState, exitState, ['yellow'])],
                  'red',
                  'red')

        import FSMInspector

        inspector = FSMInspector.FSMInspector(fsm, title = fsm.getName())

        # Note, the inspectorPos argument is optional, the inspector will
        # automagically position states on startup
        fsm = ClassicFSM.ClassicFSM('stopLight', [
            State.State('yellow',
                        enterState,
                        exitState,
                        ['red'],
                        inspectorPos = [95.9, 48.0]),
            State.State('red',
                        enterState,
                        exitState,
                        ['green'],
                        inspectorPos = [0.0, 0.0]),
            State.State('green',
                        enterState,
                        exitState,
                        ['yellow'],
                        inspectorPos = [0.0, 95.9])],
                'red',
                'red')

    3) Pop open a viewer::

        import FSMInspector
        insp = FSMInspector.FSMInspector(fsm)

    or if you wish to be fancy::

        insp = FSMInspector.FSMInspector(fsm, title = fsm.getName())

    Features:

      - Right mouse button over a state pops up a menu allowing you to
        request a transition to that state
      - Middle mouse button will grab the canvas and slide things around if
        your state machine is bigger than the viewing area
      - There are some self explanatory menu options up at the top, the most
        useful being: "print ClassicFSM layout" which will print out Python
        code which will create an ClassicFSM augmented with layout
        information for the viewer so everything shows up in the same place
        the next time you inspect the state machine

    Caveat
    ------

    There is an unexplained problem with using Tk and emacs right now which
    occasionally results in everything locking up.  This procedure seems to
    avoid the problem for me::

       # Start up the show
       from direct.showbase.ShowBaseGlobal import *

       # You will see the window and a Tk panel pop open

       # Type a number at the emacs prompt
       >>> 123

       # At this point everything will lock up and you won't get your prompt back

       # Hit a bunch of Control-C's in rapid succession, in most cases
       # this will break you out of whatever badness you were in and
       # from that point on everything will behave normally

       # This is how you pop up an inspector
       import FSMInspector
       inspector = FSMInspector.FSMInspector(fsm, title = fsm.getName())

## Variable Documentation

## ◆ DELTA

tuple DELTA = (5.0 / 360.) * 2.0 * math.pi