Welcome, guest | Sign In | My Account | Store | Cart

A simple Towers of Hanoi demo using wxPython. This sits with my Koch snowflake demo and Guido's similar demo using Tk. Credit to Martin Bernreuther for inspiration.

Python, 198 lines
  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
#!/usr/bin/env python

"""
The Towers of Hanoi for wxPython
by S. Foster, Jan. 2004

    based on wxHanoi.cpp
    by Martin Bernreuther
"""

from wxPython.wx import *

import cPickle
import zlib

COLOURS = [ 'RED', 'CORAL', 'YELLOW', 'GREEN', 'BLUE', 'MAGENTA', 'PURPLE' ]

ICON = """\
\x78\x9c\x9d\x91\xbd\x0a\xc2\x30\x00\x84\xf7\x3c\x45\xc0\x21\x42\
\x21\xe4\xa7\xad\xba\x3a\x74\xb4\x43\x97\xac\xa1\x88\x83\xc5\xf4\
\xfd\x27\xef\x4c\x83\x20\x18\xc1\xa3\x3d\x9a\x8f\xef\xb2\x74\xbf\
\xac\x56\x4c\xca\x3b\x89\xa7\x97\x56\x89\xd5\x89\x38\x29\x2d\x67\
\x79\x5e\xe2\x7c\x07\xf0\x04\x0d\xc0\x6e\x18\x0c\x02\xd4\x12\x8d\
\x44\xc6\x10\x02\x75\x44\x21\x5b\x1b\xea\x89\x52\xb6\xe8\x01\x1d\
\x88\x24\xd0\x25\x3d\xae\x38\x1f\xf3\xb9\x1e\x78\x27\x11\x6f\x7f\
\xbe\xdb\xfd\xfa\x7d\x9f\xfe\xf8\xc2\xfd\xd6\x40\x66\x65\x3b\x84\
\x50\xb5\x2d\xed\x52\xaf\x49\x62\x6a\x13\x47\xbb\x14\x27\x63\x4e\
\x65\xe2\x69\x97\xc2\xa4\x29\xf9\x3e\x69\x69\x97\xc2\x6f\xfc\x11\
\x4e\x3a\xda\xa5\xf4\x13\x8d\x92\x69\x2c"""

def getIconData():
    return cPickle.loads( zlib.decompress( ICON ))

class wxHanoiDisc:
    def __init__( self, n, width, height ):
        self.width = ( n + 1 ) * width
        self.height = height
        self.n = n
        self.brush = wxBrush( wxNamedColour( COLOURS[ n % len( COLOURS )] ))

class wxHanoiFrame( wxFrame ):
    def __init__( self, title, pos, size ):
        wxFrame.__init__( self, None, -1,
                            title, pos = pos, size = size )

        icon = wxIconFromXPMData( getIconData() )
        self.SetIcon( icon )

        self.CreateMenu()
        self.CreateStatusBar();

        self.sleepTime = 3
        self.numDiscs = 4

        self.pen = wxPen( wxNamedColour( 'BLACK' ), 1, wxSOLID )

        self.Initialize()

        EVT_CLOSE( self, self.OnCloseWindow )
        EVT_PAINT( self, self.OnPaint )

    def CreateMenu( self ):

        def MenuCallback( menu, item, callback ):
            id = wxNewId()
            menu.Append( id, item )
            EVT_MENU( self, id, callback )

        menuBar = wxMenuBar()

        menuFile = wxMenu()
        MenuCallback( menuFile, 'E&xit...\tCtrl-X', self.OnQuit )
        menuBar.Append( menuFile, '&File' )

        menuPlay = wxMenu()
        MenuCallback( menuPlay, '&Number of Discs...', self.OnInpNumDiscs )
        MenuCallback( menuPlay, '&Time between Moves...', self.OnInpSleepTime )
        menuPlay.AppendSeparator()
        MenuCallback( menuPlay, '&Play', self.OnPlay )
        MenuCallback( menuPlay, '&Reset', self.OnReset )
        menuBar.Append( menuPlay, '&Play' )

        menuHelp = wxMenu()
        MenuCallback( menuHelp, '&About...', self.OnAbout )
        menuBar.Append( menuHelp, '&Help' )

        self.SetMenuBar( menuBar )

    def Initialize( self ):
        self.width, self.height = self.GetClientSize()
        maxwidth = self.width / 3
        w = self.width / 6
        self.xpos = [ i * w for i in [ 1, 3, 5 ]]

        height = self.height / self.numDiscs
        width = maxwidth / self.numDiscs
        if height > width:
            height = width
        self.discheight = height
        self.discwidthfac = width
        
        discs = range( self.numDiscs )
        discs.reverse()

        self.pegs = [[ wxHanoiDisc( i, width, height ) for i in discs ], [], []]
        self.moves = 0

        width, height = self.GetClientSize()
        self.Draw( wxClientDC( self ), width, height )

    def OnQuit( self, _event ):
        self.Close( true );

    def OnCloseWindow( self, event ):
        self.Destroy()

    def OnAbout( self, event ):
        wxMessageBox( __doc__, 'About wxHanoi', wxOK|wxICON_INFORMATION, self )

    def OnInpNumDiscs( self, _event ):
        self.numDiscs = wxGetNumberFromUser( '', 'Discs:', 'Number of Discs', 
                                                self.numDiscs, 1, 25, self )
        if self.numDiscs == -1:
            self.SetStatusText( "Invalid number entered or dialog cancelled." )
        else:
            self.Initialize()
        
    def OnInpSleepTime( self, _event ):
        self.sleepTime = wxGetNumberFromUser( '', 'Wait [sec/10]:', 'Time between Moves', 
                                                self.sleepTime, 0, 10, self )
        if self.sleepTime == -1:
            self.SetStatusText( "Invalid number entered or dialog cancelled." )
        else:
            self.Initialize()

    def OnPlay( self, _event ):
        self.Initialize()
        self.SetStatusText( 'Playing' )
        self.Move( 0, 2, 1, self.numDiscs )
        self.SetStatusText( 'Finished: %s Moves' % self.moves )
    
    def OnReset( self, event ):
        self.Initialize()

    def DrawDisc( self, dc, disc, x, y ):
        assert x <= 2
        dc.SetPen( self.pen )
        dc.SetBrush( disc.brush )
        dc.DrawRectangle(
            self.xpos[x] - ( disc.width / 2 ),
            self.height - ( y * self.discheight ),
            disc.width,
            disc.height )

    def Draw( self, dc, width, height ):
        mdc = wxMemoryDC()
        mdc.SelectObject( wxEmptyBitmap( width, height ))
        mdc.BeginDrawing()
        for x, peg in enumerate( self.pegs ):
            for y, disc in enumerate( peg ):
                self.DrawDisc( mdc, disc, x, y+1 )
        mdc.EndDrawing()
        dc.Blit( 0, 0, width, height, mdc, 0, 0 )
        
    def OnPaint( self, event ):
        width, height = self.GetClientSize()
        self.Draw( wxPaintDC( self ), width, height )

    def MoveDisc( self, src, dst ):
        disc = self.pegs[src].pop()
        self.pegs[dst].append( disc )
        self.moves += 1
        self.SetStatusText( 'Move %s' % self.moves )
        width, height = self.GetClientSize()
        self.Draw( wxClientDC( self ), width, height )
        wxUsleep( 100 * self.sleepTime )

    def Move( self, src, dst, temp, n ):
        if n == 1:
            self.MoveDisc( src, dst )
        else:
            self.Move( src, temp, dst, n-1 )
            self.MoveDisc( src, dst )
            self.Move( temp, dst, src, n-1 )

class wxHanoiApp( wxApp ):
    def OnInit( self ):
        self.frame = wxHanoiFrame(
                        'Towers of Hanoi for wxPython',
                        wxPoint( 50, 50 ),
                        wxSize( 450, 350 ))
        self.frame.Show( True )
        self.SetTopWindow( self.frame )

        return True

app = wxHanoiApp(0)
app.MainLoop()

5 comments

Tom Churm 17 years, 11 months ago  # | flag

global undefined. fyi - using python 2.2.2 with wxPython 2.4.2.4 on Win2K i get:

NameError: global name 'enumerate' is not defined

Uche Ogbuji 17 years, 11 months ago  # | flag

Python 2.3 required. The undefined global is because enumerate isa new built-in with Python 2.3. The author should explicitly state that this recipe requires Python 2.3 or more recent. (Technically it's not hard to re-write enumerate for earlier Python versions. Subject of another recipe, perhaps? :-) )

Simon Foster (author) 17 years, 11 months ago  # | flag

Python Version. OK, OK, Python 2.3 required because of the use of the 'enumerate' built-in. On older versions of Python there are alternatives to enumerate, see elsewhere in the cookbook :-)

Dave Richards 17 years, 10 months ago  # | flag

A slight improvement (on my PC anyway). Didn't get to see many of the moves: adding wxYield() to the end of Move() did the trick.

Michael Dwyer 16 years, 7 months ago  # | flag

Change call to wxUsleep() to wxMilliSleep() when using wxWidgets-2.5.3 or higher. When running this code with wxWidgets-2.5.3 or higher an error will be reported:

python wxHanoiApp.py

Traceback (most recent call last):

File "wxHanoiApp.py", line 139, in OnPlay

self.Move( 0, 2, 1, self.numDiscs )

File "wxHanoiApp.py", line 182, in Move

self.Move( src, temp, dst, n-1 )

File "wxHanoiApp.py", line 182, in Move

self.Move( src, temp, dst, n-1 )

File "wxHanoiApp.py", line 182, in Move

self.Move( src, temp, dst, n-1 )

File "wxHanoiApp.py", line 180, in Move

self.MoveDisc( src, dst )

File "wxHanoiApp.py", line 176, in MoveDisc

wxUsleep( 100 * self.sleepTime )

NameError: global name 'wxUsleep' is not defined

When using wxWidgets-2.5.3 or higher the code needs to be updated changing the function call wxUsleep() to wxMilliSleep(). The function wxUsleep() has been deprecated.

THANX(MKD).