def __init__(self):
        wx.Frame.__init__(self, None, -1, self.title)
        
        self.datagen = DataGen()        
        self.data = [self.datagen.next()]
        self.paused = False
        
        self.create_menu()
        self.create_status_bar()
        self.create_main_panel()
        
        self.redraw_timer = wx.Timer(self)
        self.Bind(wx.EVT_TIMER, self.on_redraw_timer, self.redraw_timer)        
        self.redraw_timer.Start(REFRESH_INTERVAL_MS)

        self.Bind(wx.EVT_CLOSE, self.on_exit)

        if self.datagen.ser != None:
            self.flash_status_message("Connected to %s" % self.datagen.ser.port)
        else:
            self.flash_status_message("Failed to connect")
class GraphFrame(wx.Frame):
    """ The main frame of the application
    """
    title = 'Demo: dynamic matplotlib graph'
    
    def __init__(self):
        wx.Frame.__init__(self, None, -1, self.title)
        
        self.datagen = DataGen()        
        self.data = [self.datagen.next()]
        self.paused = False
        
        self.create_menu()
        self.create_status_bar()
        self.create_main_panel()
        
        self.redraw_timer = wx.Timer(self)
        self.Bind(wx.EVT_TIMER, self.on_redraw_timer, self.redraw_timer)        
        self.redraw_timer.Start(REFRESH_INTERVAL_MS)

        self.Bind(wx.EVT_CLOSE, self.on_exit)

        if self.datagen.ser != None:
            self.flash_status_message("Connected to %s" % self.datagen.ser.port)
        else:
            self.flash_status_message("Failed to connect")

    def create_menu(self):
        self.menubar = wx.MenuBar()
        
        menu_file = wx.Menu()
        m_expt = menu_file.Append(-1, "&Save plot\tCtrl-S", "Save plot to file")
        self.Bind(wx.EVT_MENU, self.on_save_plot, m_expt)
        menu_file.AppendSeparator()
        m_exit = menu_file.Append(-1, "E&xit\tCtrl-X", "Exit")
        self.Bind(wx.EVT_MENU, self.on_exit, m_exit)
                
        self.menubar.Append(menu_file, "&File")
        self.SetMenuBar(self.menubar)

    def create_main_panel(self):
        self.panel = wx.Panel(self)

        self.init_plot()
        self.canvas = FigCanvas(self.panel, -1, self.fig)

        self.xmin_control = BoundControlBox(self.panel, -1, "X min", 0)
        self.xmax_control = BoundControlBox(self.panel, -1, "X max", 50)
        self.ymin_control = BoundControlBox(self.panel, -1, "Y min", 0)
        self.ymax_control = BoundControlBox(self.panel, -1, "Y max", 4)
        
        self.pause_button = wx.Button(self.panel, -1, "Pause")
        self.Bind(wx.EVT_BUTTON, self.on_pause_button, self.pause_button)
        self.Bind(wx.EVT_UPDATE_UI, self.on_update_pause_button, self.pause_button)
        
        self.cb_grid = wx.CheckBox(self.panel, -1, 
            "Show Grid",
            style=wx.ALIGN_RIGHT)
        self.Bind(wx.EVT_CHECKBOX, self.on_cb_grid, self.cb_grid)
        self.cb_grid.SetValue(True)
        
        self.cb_xlab = wx.CheckBox(self.panel, -1, 
            "Show X labels",
            style=wx.ALIGN_RIGHT)
        self.Bind(wx.EVT_CHECKBOX, self.on_cb_xlab, self.cb_xlab)        
        self.cb_xlab.SetValue(True)
        
        self.hbox1 = wx.BoxSizer(wx.HORIZONTAL)
        self.hbox1.Add(self.pause_button, border=5, flag=wx.ALL | wx.ALIGN_CENTER_VERTICAL)
        self.hbox1.AddSpacer(20)
        self.hbox1.Add(self.cb_grid, border=5, flag=wx.ALL | wx.ALIGN_CENTER_VERTICAL)
        self.hbox1.AddSpacer(10)
        self.hbox1.Add(self.cb_xlab, border=5, flag=wx.ALL | wx.ALIGN_CENTER_VERTICAL)
        
        self.hbox2 = wx.BoxSizer(wx.HORIZONTAL)
        self.hbox2.Add(self.xmin_control, border=5, flag=wx.ALL)
        self.hbox2.Add(self.xmax_control, border=5, flag=wx.ALL)
        self.hbox2.AddSpacer(24)
        self.hbox2.Add(self.ymin_control, border=5, flag=wx.ALL)
        self.hbox2.Add(self.ymax_control, border=5, flag=wx.ALL)
        
        self.vbox = wx.BoxSizer(wx.VERTICAL)
        self.vbox.Add(self.canvas, 1, flag=wx.LEFT | wx.TOP | wx.EXPAND)        
        self.vbox.Add(self.hbox1, 0, flag=wx.ALIGN_LEFT | wx.TOP)
        self.vbox.Add(self.hbox2, 0, flag=wx.ALIGN_LEFT | wx.TOP)
        
        self.panel.SetSizer(self.vbox)
        self.vbox.Fit(self)
    
    def create_status_bar(self):
        self.statusbar = self.CreateStatusBar()

    def init_plot(self):
        self.dpi = 100
        self.fig = Figure((3.0, 3.0), dpi=self.dpi)

        self.axes = self.fig.add_subplot(111)
        self.axes.set_axis_bgcolor('black')
        self.axes.set_title('Arduino Serial Data', size=12)
        self.axes.set_xlabel('Time (s)', fontsize=10)
        self.axes.set_ylabel('Current (uA)', fontsize=10)
        
        pylab.setp(self.axes.get_xticklabels(), fontsize=8)
        pylab.setp(self.axes.get_yticklabels(), fontsize=8)

        # plot the data as a line series, and save the reference 
        # to the plotted line series
        #
        self.plot_data = self.axes.plot(
            self.data, 
            linewidth=1,
            color=(1, 1, 0),
            )[0]

    def draw_plot(self):
        """ Redraws the plot
        """
        # when xmin is on auto, it "follows" xmax to produce a 
        # sliding window effect. therefore, xmin is assigned after
        # xmax.
        #
        if self.xmax_control.is_auto():
            xmax = len(self.data) if len(self.data) > 50 else 50
        else:
            xmax = int(self.xmax_control.manual_value())
            
        if self.xmin_control.is_auto():            
            xmin = xmax - 50
        else:
            xmin = int(self.xmin_control.manual_value())

        # for ymin and ymax, find the minimal and maximal values
        # in the data set and add a mininal margin.
        # 
        # note that it's easy to change this scheme to the 
        # minimal/maximal value in the current display, and not
        # the whole data set.
        # 
        if self.ymin_control.is_auto():
            ymin = round(min(self.data), 0) - 1
        else:
            ymin = int(self.ymin_control.manual_value())
        
        if self.ymax_control.is_auto():
            ymax = round(max(self.data), 0) + 1
        else:
            ymax = int(self.ymax_control.manual_value())        

        self.axes.set_xbound(lower=xmin, upper=xmax)
        self.axes.set_ybound(lower=ymin, upper=ymax)
        
        # anecdote: axes.grid assumes b=True if any other flag is
        # given even if b is set to False.
        # so just passing the flag into the first statement won't
        # work.
        #
        if self.cb_grid.IsChecked():
            self.axes.grid(True, color='gray')
        else:
            self.axes.grid(False)

        # Using setp here is convenient, because get_xticklabels
        # returns a list over which one needs to explicitly 
        # iterate, and setp already handles this.
        #  
        pylab.setp(self.axes.get_xticklabels(), 
            visible=self.cb_xlab.IsChecked())
        
        self.plot_data.set_xdata(np.arange(len(self.data)))
        self.plot_data.set_ydata(np.array(self.data))
        
        self.canvas.draw()
    
    def on_pause_button(self, event):
        self.paused = not self.paused
    
    def on_update_pause_button(self, event):
        label = "Resume" if self.paused else "Pause"
        self.pause_button.SetLabel(label)
    
    def on_cb_grid(self, event):
        self.draw_plot()
    
    def on_cb_xlab(self, event):
        self.draw_plot()
    
    def on_save_plot(self, event):
        file_choices = "PNG (*.png)|*.png"
        
        dlg = wx.FileDialog(
            self, 
            message="Save plot as...",
            defaultDir=os.getcwd(),
            defaultFile="plot.png",
            wildcard=file_choices,
            style=wx.SAVE)
        
        if dlg.ShowModal() == wx.ID_OK:
            path = dlg.GetPath()
            self.canvas.print_figure(path, dpi=self.dpi)
            self.flash_status_message("Saved to %s" % path)
    
    def on_redraw_timer(self, event):
        # if paused do not add data, but still redraw the plot
        # (to respond to scale modifications, grid change, etc.)
        #
        if not self.paused:
            self.data.append(self.datagen.next())
        
        self.draw_plot()
    
    def on_exit(self, event):
        self.datagen.Running = False
        self.datagen.thread.join()
        self.Destroy()
    
    def flash_status_message(self, msg, flash_len_ms=1500):
        self.statusbar.SetStatusText(msg)
        self.timeroff = wx.Timer(self)
        self.Bind(
            wx.EVT_TIMER, 
            self.on_flash_status_off, 
            self.timeroff)
        self.timeroff.Start(flash_len_ms, oneShot=True)
    
    def on_flash_status_off(self, event):
        self.statusbar.SetStatusText('')