attachment:metronome1.py of Metronome

   1 '''metronome1
   2 Now try to get a flexible timer by constantly checking the number of beats per
   3 minute after every beat.
   4 '''
   5 import wx
   6 
   7 mspm = 60*1000 # milliseconds per minute
   8     
   9 class MFrame(wx.Frame):
  10     def __init__(self,):
  11         wx.Frame.__init__(self,None)
  12         #define the components
  13         self.go = wx.Button(self,wx.ID_ANY,"Start")
  14         self.stop = wx.Button(self,wx.ID_ANY,"Stop")
  15         self.bpm = wx.SpinCtrl(self,wx.ID_ANY,value="120",min=1,max=240)
  16         self.dingcheck = wx.CheckBox(self,wx.ID_ANY)
  17         self.downbeat = wx.SpinCtrl(self,wx.ID_ANY,value="4",min = 2, max=12)
  18 
  19         self.dingcheck.SetValue(False)
  20         self.downbeat.Enable(False)
  21         
  22         #do the layout
  23         sizer = wx.BoxSizer(wx.VERTICAL)
  24         sizer.Add(wx.StaticText(self,wx.ID_ANY,"Set the beats per minute"))
  25         sizer.Add(self.bpm)
  26         sizer.Add(self.go)
  27         sizer.Add(self.stop)
  28         s2 = wx.BoxSizer(wx.HORIZONTAL)
  29         s2.Add(self.dingcheck,0,wx.ALIGN_CENTRE_VERTICAL)
  30         s2.Add(wx.StaticText(self,wx.ID_ANY,"Beats per measure"),0,wx.ALIGN_CENTRE_VERTICAL)
  31         s2.Add(self.downbeat)
  32         sizer.Add(s2)
  33         self.SetSizerAndFit(sizer)
  34         self.Layout()
  35         
  36         #Bind events
  37         self.Bind(wx.EVT_BUTTON,self.Start,self.go)
  38         self.Bind(wx.EVT_BUTTON,self.Stop,self.stop)
  39         self.Bind(wx.EVT_TIMER,self.Tick)
  40         self.Bind(wx.EVT_CHECKBOX,self.SetDownBeat,self.dingcheck)
  41         
  42     def SetDownBeat(self,evt):
  43         if self.dingcheck.IsChecked():
  44             self.downbeat.Enable(True)
  45         else:
  46             self.downbeat.Enable(False)
  47             
  48     def Start(self,evt):
  49         self.timer=wx.Timer(self)
  50         self.count = 0
  51         self.timer.Start(mspm/float(self.bpm.GetValue()))
  52         self.go.Enable(False)
  53         self.stop.Enable(True)
  54 
  55     def Stop(self,evt):
  56         self.timer.Stop()
  57         del self.timer
  58         self.go.Enable(True)
  59         self.stop.Enable(False)
  60 
  61     def Tick(self,evt):
  62         if bool(self.count):
  63             sound = wx.Sound('tick2.wav')
  64         else:
  65             if self.dingcheck.IsChecked():
  66                 sound = wx.Sound('ding.wav')
  67             else:
  68                 sound = wx.Sound('tick2.wav')
  69         sound.Play(wx.SOUND_ASYNC)
  70         self.count = (self.count + 1) % int(self.downbeat.GetValue())
  71         wx.YieldIfNeeded()
  72         
  73 class TestApp(wx.App):
  74     def OnInit(self):
  75         mainframe = MFrame()
  76         self.SetTopWindow(mainframe)
  77         mainframe.Show()
  78         return 1
  79 
  80 
  81 app = TestApp(0)
  82 app.MainLoop()