.. _user_interfaces-wxcursor_demo:

user_interfaces example code: wxcursor_demo.py
==============================================

[`source code <wxcursor_demo.py>`_]

::

    """
    Example to draw a cursor and report the data coords in wx
    """
    # matplotlib requires wxPython 2.8+
    # set the wxPython version in lib\site-packages\wx.pth file
    # or if you have wxversion installed un-comment the lines below
    #import wxversion
    #wxversion.ensureMinimal('2.8')
    
    import matplotlib
    matplotlib.use('WXAgg')
    
    from matplotlib.backends.backend_wxagg import FigureCanvasWxAgg as FigureCanvas
    from matplotlib.backends.backend_wx import NavigationToolbar2Wx, wxc
    from matplotlib.figure import Figure
    from numpy import arange, sin, pi
    
    import wx
    
    
    class CanvasFrame(wx.Frame):
        def __init__(self, ):
            wx.Frame.__init__(self, None, -1,
                              'CanvasFrame', size=(550, 350))
    
            self.SetBackgroundColour(wxc.NamedColour("WHITE"))
    
            self.figure = Figure()
            self.axes = self.figure.add_subplot(111)
            t = arange(0.0, 3.0, 0.01)
            s = sin(2*pi*t)
    
            self.axes.plot(t, s)
            self.axes.set_xlabel('t')
            self.axes.set_ylabel('sin(t)')
            self.figure_canvas = FigureCanvas(self, -1, self.figure)
    
            # Note that event is a MplEvent
            self.figure_canvas.mpl_connect('motion_notify_event', self.UpdateStatusBar)
            self.figure_canvas.Bind(wx.EVT_ENTER_WINDOW, self.ChangeCursor)
    
            self.sizer = wx.BoxSizer(wx.VERTICAL)
            self.sizer.Add(self.figure_canvas, 1, wx.LEFT | wx.TOP | wx.GROW)
            self.SetSizer(self.sizer)
            self.Fit()
    
            self.statusBar = wx.StatusBar(self, -1)
            self.SetStatusBar(self.statusBar)
    
            self.toolbar = NavigationToolbar2Wx(self.figure_canvas)
            self.sizer.Add(self.toolbar, 0, wx.LEFT | wx.EXPAND)
            self.toolbar.Show()
    
        def ChangeCursor(self, event):
            self.figure_canvas.SetCursor(wxc.StockCursor(wx.CURSOR_BULLSEYE))
    
        def UpdateStatusBar(self, event):
            if event.inaxes:
                x, y = event.xdata, event.ydata
                self.statusBar.SetStatusText(("x= " + str(x) +
                                              "  y=" + str(y)),
                                             0)
    
    
    class App(wx.App):
        def OnInit(self):
            'Create the main window and insert the custom frame'
            frame = CanvasFrame()
            self.SetTopWindow(frame)
            frame.Show(True)
            return True
    
    if __name__ == '__main__':
        app = App(0)
        app.MainLoop()
    

Keywords: python, matplotlib, pylab, example, codex (see :ref:`how-to-search-examples`)