content: """
   A wxPython backend for matplotlib, based (very heavily) on
   backend_template.py and backend_gtk.py
  
   Author: Jeremy O'Donoghue (jeremy@o-donoghue.com)
  
   Derived from original copyright work by John Hunter
   (jdhunter@ace.bsd.uchicago.edu)
  
   Copyright (C) Jeremy O'Donoghue & John Hunter, 2003-4
  
   License: This work is licensed under a PSF compatible license. A copy
   should be included with this source code.
  
  """
  from __future__ import (absolute_import, division, print_function,
                          unicode_literals)
  
  from six.moves import xrange
  
  import sys
  import os
  import os.path
  import math
  import weakref
  import warnings
  
  import numpy as np
  
  import matplotlib
  from matplotlib.backend_bases import (RendererBase, GraphicsContextBase,
      FigureCanvasBase, FigureManagerBase, NavigationToolbar2,
      cursors, TimerBase)
  from matplotlib.backend_bases import ShowBase
  from matplotlib.backend_bases import _has_pil
  
  from matplotlib._pylab_helpers import Gcf
  from matplotlib.cbook import (is_string_like, is_writable_file_like,
                                warn_deprecated)
  from matplotlib.figure import Figure
  from matplotlib.path import Path
  from matplotlib.transforms import Affine2D
  from matplotlib.widgets import SubplotTool
  from matplotlib import rcParams
  
  from . import wx_compat as wxc
  import wx
  
  # Debugging settings here...
  # Debug level set here. If the debug level is less than 5, information
  # messages (progressively more info for lower value) are printed. In addition,
  # traceback is performed, and pdb activated, for all uncaught exceptions in
  # this case
  _DEBUG = 5
  if _DEBUG < 5:
      import traceback
      import pdb
  _DEBUG_lvls = {1: 'Low ', 2: 'Med ', 3: 'High', 4: 'Error'}
  
  
  def DEBUG_MSG(string, lvl=3, o=None):
      if lvl >= _DEBUG:
          cls = o.__class__
          # Jeremy, often times the commented line won't print but the
          # one below does.  I think WX is redefining stderr, damned
          # beast
          #print >>sys.stderr, "%s- %s in %s" % (_DEBUG_lvls[lvl], string, cls)
          print("%s- %s in %s" % (_DEBUG_lvls[lvl], string, cls))
  
  
  def debug_on_error(type, value, tb):
      """Code due to Thomas Heller - published in Python Cookbook (O'Reilley)"""
      traceback.print_exc(type, value, tb)
      print()
      pdb.pm()  # jdh uncomment
  
  
  class fake_stderr(object):
      """
      Wx does strange things with stderr, as it makes the assumption that
      there is probably no console. This redirects stderr to the console, since
      we know that there is one!
      """
  
      def write(self, msg):
          print("Stderr: %s\n\r" % msg)
  
  #if _DEBUG < 5:
      #sys.excepthook = debug_on_error
      #WxLogger =wx.LogStderr()
      #sys.stderr = fake_stderr
  
  # the True dots per inch on the screen; should be display dependent
  # see
  # http://groups.google.com/groups?q=screen+dpi+x11&hl=en&lr=&ie=UTF-8&oe=UTF-8&safe=off&selm=7077.26e81ad5%40swift.cs.tcd.ie&rnum=5
  # for some info about screen dpi
  PIXELS_PER_INCH = 75
  
  # Delay time for idle checks
  IDLE_DELAY = 5
  
  
  def error_msg_wx(msg, parent=None):
      """
      Signal an error condition -- in a GUI, popup a error dialog
      """
      dialog = wx.MessageDialog(parent=parent,
                                message=msg,
                                caption='Matplotlib backend_wx error',
                                style=wx.OK | wx.CENTRE)
      dialog.ShowModal()
      dialog.Destroy()
      return None
  
  
  def raise_msg_to_str(msg):
      """msg is a return arg from a raise.  Join with new lines"""
      if not is_string_like(msg):
          msg = '\n'.join(map(str, msg))
      return msg
  
  
  class TimerWx(TimerBase):
      '''
      Subclass of :class:`backend_bases.TimerBase` that uses WxTimer events.
  
      Attributes:
      * interval: The time between timer events in milliseconds. Default
          is 1000 ms.
      * single_shot: Boolean flag indicating whether this timer should
          operate as single shot (run once and then stop). Defaults to False.
      * callbacks: Stores list of (func, args) tuples that will be called
          upon timer events. This list can be manipulated directly, or the
          functions add_callback and remove_callback can be used.
      '''
  
      def __init__(self, parent, *args, **kwargs):
          TimerBase.__init__(self, *args, **kwargs)
  
          # Create a new timer and connect the timer event to our handler.
          # For WX, the events have to use a widget for binding.
          self.parent = parent
          self._timer = wx.Timer(self.parent, wx.NewId())
          self.parent.Bind(wx.EVT_TIMER, self._on_timer, self._timer)
  
       # Unbinding causes Wx to stop for some reason. Disabling for now.
  #    def __del__(self):
  #        TimerBase.__del__(self)
  #        self.parent.Bind(wx.EVT_TIMER, None, self._timer)
  
      def _timer_start(self):
          self._timer.Start(self._interval, self._single)
  
      def _timer_stop(self):
          self._timer.Stop()
  
      def _timer_set_interval(self):
          self._timer_start()
  
      def _timer_set_single_shot(self):
          self._timer.Start()
  
      def _on_timer(self, *args):
          TimerBase._on_timer(self)
  
  
  class RendererWx(RendererBase):
      """
      The renderer handles all the drawing primitives using a graphics
      context instance that controls the colors/styles. It acts as the
      'renderer' instance used by many classes in the hierarchy.
      """
      # In wxPython, drawing is performed on a wxDC instance, which will
      # generally be mapped to the client aread of the window displaying
      # the plot. Under wxPython, the wxDC instance has a wx.Pen which
      # describes the colour and weight of any lines drawn, and a wxBrush
      # which describes the fill colour of any closed polygon.
  
      fontweights = wxc.fontweights
      fontangles = wxc.fontangles
  
      # wxPython allows for portable font styles, choosing them appropriately
      # for the target platform. Map some standard font names to the portable
      # styles
      # QUESTION: Is it be wise to agree standard fontnames across all backends?
      fontnames = wxc.fontnames
  
      def __init__(self, bitmap, dpi):
          """
          Initialise a wxWindows renderer instance.
          """
          warn_deprecated('2.0', message="The WX backend is "
                          "deprecated. It's untested "
                          "and will be removed in Matplotlib 2.2. "
                          "Use the WXAgg backend instead. "
                          "See Matplotlib usage FAQ for more info on backends.",
                          alternative='WXAgg')
          RendererBase.__init__(self)
          DEBUG_MSG("__init__()", 1, self)
          self.width = bitmap.GetWidth()
          self.height = bitmap.GetHeight()
          self.bitmap = bitmap
          self.fontd = {}
          self.dpi = dpi
          self.gc = None
  
      def flipy(self):
          return True
  
      def offset_text_height(self):
          return True
  
      def get_text_width_height_descent(self, s, prop, ismath):
          """
          get the width and height in display coords of the string s
          with FontPropertry prop
          """
          # return 1, 1
          if ismath:
              s = self.strip_math(s)
  
          if self.gc is None:
              gc = self.new_gc()
          else:
              gc = self.gc
          gfx_ctx = gc.gfx_ctx
          font = self.get_wx_font(s, prop)
          gfx_ctx.SetFont(font, wx.BLACK)
          w, h, descent, leading = gfx_ctx.GetFullTextExtent(s)
  
          return w, h, descent
  
      def get_canvas_width_height(self):
          'return the canvas width and height in display coords'
          return self.width, self.height
  
      def handle_clip_rectangle(self, gc):
          new_bounds = gc.get_clip_rectangle()
          if new_bounds is not None:
              new_bounds = new_bounds.bounds
          gfx_ctx = gc.gfx_ctx
          if gfx_ctx._lastcliprect != new_bounds:
              gfx_ctx._lastcliprect = new_bounds
              if new_bounds is None:
                  gfx_ctx.ResetClip()
              else:
                  gfx_ctx.Clip(new_bounds[0],
                               self.height - new_bounds[1] - new_bounds[3],
                               new_bounds[2], new_bounds[3])
  
      @staticmethod
      def convert_path(gfx_ctx, path, transform):
          wxpath = gfx_ctx.CreatePath()
          for points, code in path.iter_segments(transform):
              if code == Path.MOVETO:
                  wxpath.MoveToPoint(*points)
              elif code == Path.LINETO:
                  wxpath.AddLineToPoint(*points)
              elif code == Path.CURVE3:
                  wxpath.AddQuadCurveToPoint(*points)
              elif code == Path.CURVE4:
                  wxpath.AddCurveToPoint(*points)
              elif code == Path.CLOSEPOLY:
                  wxpath.CloseSubpath()
          return wxpath
  
      def draw_path(self, gc, path, transform, rgbFace=None):
          gc.select()
          self.handle_clip_rectangle(gc)
          gfx_ctx = gc.gfx_ctx
          transform = transform + \
              Affine2D().scale(1.0, -1.0).translate(0.0, self.height)
          wxpath = self.convert_path(gfx_ctx, path, transform)
          if rgbFace is not None:
              gfx_ctx.SetBrush(wx.Brush(gc.get_wxcolour(rgbFace)))
              gfx_ctx.DrawPath(wxpath)
          else:
              gfx_ctx.StrokePath(wxpath)
          gc.unselect()
  
      def draw_image(self, gc, x, y, im):
          bbox = gc.get_clip_rectangle()
          if bbox is not None:
              l, b, w, h = bbox.bounds
          else:
              l = 0
              b = 0
              w = self.width
              h = self.height
          rows, cols = im.shape[:2]
          bitmap = wxc.BitmapFromBuffer(cols, rows, im.tostring())
          gc = self.get_gc()
          gc.select()
          gc.gfx_ctx.DrawBitmap(bitmap, int(l), int(self.height - b),
                                int(w), int(-h))
          gc.unselect()
  
      def draw_text(self, gc, x, y, s, prop, angle, ismath=False, mtext=None):
          if ismath:
              s = self.strip_math(s)
          DEBUG_MSG("draw_text()", 1, self)
          gc.select()
          self.handle_clip_rectangle(gc)
          gfx_ctx = gc.gfx_ctx
  
          font = self.get_wx_font(s, prop)
          color = gc.get_wxcolour(gc.get_rgb())
          gfx_ctx.SetFont(font, color)
  
          w, h, d = self.get_text_width_height_descent(s, prop, ismath)
          x = int(x)
          y = int(y - h)
  
          if angle == 0.0:
              gfx_ctx.DrawText(s, x, y)
          else:
              rads = angle / 180.0 * math.pi
              xo = h * math.sin(rads)
              yo = h * math.cos(rads)
              gfx_ctx.DrawRotatedText(s, x - xo, y - yo, rads)
  
          gc.unselect()
  
      def new_gc(self):
          """
          Return an instance of a GraphicsContextWx, and sets the current gc copy
          """
          DEBUG_MSG('new_gc()', 2, self)
          self.gc = GraphicsContextWx(self.bitmap, self)
          self.gc.select()
          self.gc.unselect()
          return self.gc
  
      def get_gc(self):
          """
          Fetch the locally cached gc.
          """
          # This is a dirty hack to allow anything with access to a renderer to
          # access the current graphics context
          assert self.gc is not None, "gc must be defined"
          return self.gc
  
      def get_wx_font(self, s, prop):
          """
          Return a wx font.  Cache instances in a font dictionary for
          efficiency
          """
          DEBUG_MSG("get_wx_font()", 1, self)
  
          key = hash(prop)
          fontprop = prop
          fontname = fontprop.get_name()
  
          font = self.fontd.get(key)
          if font is not None:
              return font
  
          # Allow use of platform independent and dependent font names
          wxFontname = self.fontnames.get(fontname, wx.ROMAN)
          wxFacename = ''  # Empty => wxPython chooses based on wx_fontname
  
          # Font colour is determined by the active wx.Pen
          # TODO: It may be wise to cache font information
          size = self.points_to_pixels(fontprop.get_size_in_points())
  
          font = wx.Font(int(size + 0.5),             # Size
                         wxFontname,                # 'Generic' name
                         self.fontangles[fontprop.get_style()],   # Angle
                         self.fontweights[fontprop.get_weight()],  # Weight
                         False,                     # Underline
                         wxFacename)                # Platform font name
  
          # cache the font and gc and return it
          self.fontd[key] = font
  
          return font
  
      def points_to_pixels(self, points):
          """
          convert point measures to pixes using dpi and the pixels per
          inch of the display
          """
          return points * (PIXELS_PER_INCH / 72.0 * self.dpi / 72.0)
  
  
  class GraphicsContextWx(GraphicsContextBase):
      """
      The graphics context provides the color, line styles, etc...
  
      This class stores a reference to a wxMemoryDC, and a
      wxGraphicsContext that draws to it.  Creating a wxGraphicsContext
      seems to be fairly heavy, so these objects are cached based on the
      bitmap object that is passed in.
  
      The base GraphicsContext stores colors as a RGB tuple on the unit
      interval, e.g., (0.5, 0.0, 1.0).  wxPython uses an int interval, but
      since wxPython colour management is rather simple, I have not chosen
      to implement a separate colour manager class.
      """
      _capd = {'butt': wx.CAP_BUTT,
               'projecting': wx.CAP_PROJECTING,
               'round': wx.CAP_ROUND}
  
      _joind = {'bevel': wx.JOIN_BEVEL,
                'miter': wx.JOIN_MITER,
                'round': wx.JOIN_ROUND}
  
      _dashd_wx = wxc.dashd_wx
  
      _cache = weakref.WeakKeyDictionary()
  
      def __init__(self, bitmap, renderer):
          GraphicsContextBase.__init__(self)
          #assert self.Ok(), "wxMemoryDC not OK to use"
          DEBUG_MSG("__init__()", 1, self)
          DEBUG_MSG("__init__() 2: %s" % bitmap, 1, self)
  
          dc, gfx_ctx = self._cache.get(bitmap, (None, None))
          if dc is None:
              dc = wx.MemoryDC()
              dc.SelectObject(bitmap)
              gfx_ctx = wx.GraphicsContext.Create(dc)
              gfx_ctx._lastcliprect = None
              self._cache[bitmap] = dc, gfx_ctx
  
          self.bitmap = bitmap
          self.dc = dc
          self.gfx_ctx = gfx_ctx
          self._pen = wx.Pen('BLACK', 1, wx.SOLID)
          gfx_ctx.SetPen(self._pen)
          self._style = wx.SOLID
          self.renderer = renderer
  
      def select(self):
          """
          Select the current bitmap into this wxDC instance
          """
  
          if sys.platform == 'win32':
              self.dc.SelectObject(self.bitmap)
              self.IsSelected = True
  
      def unselect(self):
          """
          Select a Null bitmasp into this wxDC instance
          """
          if sys.platform == 'win32':
              self.dc.SelectObject(wx.NullBitmap)
              self.IsSelected = False
  
      def set_foreground(self, fg, isRGBA=None):
          """
          Set the foreground color.  fg can be a matlab format string, a
          html hex color string, an rgb unit tuple, or a float between 0
          and 1.  In the latter case, grayscale is used.
          """
          # Implementation note: wxPython has a separate concept of pen and
          # brush - the brush fills any outline trace left by the pen.
          # Here we set both to the same colour - if a figure is not to be
          # filled, the renderer will set the brush to be transparent
          # Same goes for text foreground...
          DEBUG_MSG("set_foreground()", 1, self)
          self.select()
          GraphicsContextBase.set_foreground(self, fg, isRGBA)
  
          self._pen.SetColour(self.get_wxcolour(self.get_rgb()))
          self.gfx_ctx.SetPen(self._pen)
          self.unselect()
  
      def set_graylevel(self, frac):
          """
          Set the foreground color.  fg can be a matlab format string, a
          html hex color string, an rgb unit tuple, or a float between 0
          and 1.  In the latter case, grayscale is used.
          """
          DEBUG_MSG("set_graylevel()", 1, self)
          self.select()
          GraphicsContextBase.set_graylevel(self, frac)
          self._pen.SetColour(self.get_wxcolour(self.get_rgb()))
          self.gfx_ctx.SetPen(self._pen)
          self.unselect()
  
      def set_linewidth(self, w):
          """
          Set the line width.
          """
          w = float(w)
          DEBUG_MSG("set_linewidth()", 1, self)
          self.select()
          if w > 0 and w < 1:
              w = 1
          GraphicsContextBase.set_linewidth(self, w)
          lw = int(self.renderer.points_to_pixels(self._linewidth))
          if lw == 0:
              lw = 1
          self._pen.SetWidth(lw)
          self.gfx_ctx.SetPen(self._pen)
          self.unselect()
  
      def set_capstyle(self, cs):
          """
          Set the capstyle as a string in ('butt', 'round', 'projecting')
          """
          DEBUG_MSG("set_capstyle()", 1, self)
          self.select()
          GraphicsContextBase.set_capstyle(self, cs)
          self._pen.SetCap(GraphicsContextWx._capd[self._capstyle])
          self.gfx_ctx.SetPen(self._pen)
          self.unselect()
  
      def set_joinstyle(self, js):
          """
          Set the join style to be one of ('miter', 'round', 'bevel')
          """
          DEBUG_MSG("set_joinstyle()", 1, self)
          self.select()
          GraphicsContextBase.set_joinstyle(self, js)
          self._pen.SetJoin(GraphicsContextWx._joind[self._joinstyle])
          self.gfx_ctx.SetPen(self._pen)
          self.unselect()
  
      def set_linestyle(self, ls):
          """
          Set the line style to be one of
          """
          DEBUG_MSG("set_linestyle()", 1, self)
          self.select()
          GraphicsContextBase.set_linestyle(self, ls)
          try:
              self._style = GraphicsContextWx._dashd_wx[ls]
          except KeyError:
              self._style = wx.LONG_DASH  # Style not used elsewhere...
  
          # On MS Windows platform, only line width of 1 allowed for dash lines
          if wx.Platform == '__WXMSW__':
              self.set_linewidth(1)
  
          self._pen.SetStyle(self._style)
          self.gfx_ctx.SetPen(self._pen)
          self.unselect()
  
      def get_wxcolour(self, color):
          """return a wx.Colour from RGB format"""
          DEBUG_MSG("get_wx_color()", 1, self)
          if len(color) == 3:
              r, g, b = color
              r *= 255
              g *= 255
              b *= 255
              return wx.Colour(red=int(r), green=int(g), blue=int(b))
          else:
              r, g, b, a = color
              r *= 255
              g *= 255
              b *= 255
              a *= 255
              return wx.Colour(
                  red=int(r),
                  green=int(g),
                  blue=int(b),
                  alpha=int(a))
  
  
  class FigureCanvasWx(FigureCanvasBase, wx.Panel):
      """
      The FigureCanvas contains the figure and does event handling.
  
      In the wxPython backend, it is derived from wxPanel, and (usually) lives
      inside a frame instantiated by a FigureManagerWx. The parent window
      probably implements a wx.Sizer to control the displayed control size - but
      we give a hint as to our preferred minimum size.
      """
  
      keyvald = {
          wx.WXK_CONTROL: 'control',
          wx.WXK_SHIFT: 'shift',
          wx.WXK_ALT: 'alt',
          wx.WXK_LEFT: 'left',
          wx.WXK_UP: 'up',
          wx.WXK_RIGHT: 'right',
          wx.WXK_DOWN: 'down',
          wx.WXK_ESCAPE: 'escape',
          wx.WXK_F1: 'f1',
          wx.WXK_F2: 'f2',
          wx.WXK_F3: 'f3',
          wx.WXK_F4: 'f4',
          wx.WXK_F5: 'f5',
          wx.WXK_F6: 'f6',
          wx.WXK_F7: 'f7',
          wx.WXK_F8: 'f8',
          wx.WXK_F9: 'f9',
          wx.WXK_F10: 'f10',
          wx.WXK_F11: 'f11',
          wx.WXK_F12: 'f12',
          wx.WXK_SCROLL: 'scroll_lock',
          wx.WXK_PAUSE: 'break',
          wx.WXK_BACK: 'backspace',
          wx.WXK_RETURN: 'enter',
          wx.WXK_INSERT: 'insert',
          wx.WXK_DELETE: 'delete',
          wx.WXK_HOME: 'home',
          wx.WXK_END: 'end',
          wx.WXK_PAGEUP: 'pageup',
          wx.WXK_PAGEDOWN: 'pagedown',
          wx.WXK_NUMPAD0: '0',
          wx.WXK_NUMPAD1: '1',
          wx.WXK_NUMPAD2: '2',
          wx.WXK_NUMPAD3: '3',
          wx.WXK_NUMPAD4: '4',
          wx.WXK_NUMPAD5: '5',
          wx.WXK_NUMPAD6: '6',
          wx.WXK_NUMPAD7: '7',
          wx.WXK_NUMPAD8: '8',
          wx.WXK_NUMPAD9: '9',
          wx.WXK_NUMPAD_ADD: '+',
          wx.WXK_NUMPAD_SUBTRACT: '-',
          wx.WXK_NUMPAD_MULTIPLY: '*',
          wx.WXK_NUMPAD_DIVIDE: '/',
          wx.WXK_NUMPAD_DECIMAL: 'dec',
          wx.WXK_NUMPAD_ENTER: 'enter',
          wx.WXK_NUMPAD_UP: 'up',
          wx.WXK_NUMPAD_RIGHT: 'right',
          wx.WXK_NUMPAD_DOWN: 'down',
          wx.WXK_NUMPAD_LEFT: 'left',
          wx.WXK_NUMPAD_PAGEUP: 'pageup',
          wx.WXK_NUMPAD_PAGEDOWN: 'pagedown',
          wx.WXK_NUMPAD_HOME: 'home',
          wx.WXK_NUMPAD_END: 'end',
          wx.WXK_NUMPAD_INSERT: 'insert',
          wx.WXK_NUMPAD_DELETE: 'delete',
      }
  
      def __init__(self, parent, id, figure):
          """
          Initialise a FigureWx instance.
  
          - Initialise the FigureCanvasBase and wxPanel parents.
          - Set event handlers for:
            EVT_SIZE  (Resize event)
            EVT_PAINT (Paint event)
          """
  
          FigureCanvasBase.__init__(self, figure)
          # Set preferred window size hint - helps the sizer (if one is
          # connected)
          l, b, w, h = figure.bbox.bounds
          w = int(math.ceil(w))
          h = int(math.ceil(h))
  
          wx.Panel.__init__(self, parent, id, size=wx.Size(w, h))
  
          def do_nothing(*args, **kwargs):
              warnings.warn(
                  "could not find a setinitialsize function for backend_wx; "
                  "please report your wxpython version=%s "
                  "to the matplotlib developers list" %
                  wxc.backend_version)
              pass
  
          # try to find the set size func across wx versions
          try:
              getattr(self, 'SetInitialSize')
          except AttributeError:
              self.SetInitialSize = getattr(self, 'SetBestFittingSize',
                                            do_nothing)
  
          if not hasattr(self, 'IsShownOnScreen'):
              self.IsShownOnScreen = getattr(self, 'IsVisible',
                                             lambda *args: True)
  
          # Create the drawing bitmap
          self.bitmap = wxc.EmptyBitmap(w, h)
          DEBUG_MSG("__init__() - bitmap w:%d h:%d" % (w, h), 2, self)
          # TODO: Add support for 'point' inspection and plot navigation.
          self._isDrawn = False
  
          self.Bind(wx.EVT_SIZE, self._onSize)
          self.Bind(wx.EVT_PAINT, self._onPaint)
          self.Bind(wx.EVT_KEY_DOWN, self._onKeyDown)
          self.Bind(wx.EVT_KEY_UP, self._onKeyUp)
          self.Bind(wx.EVT_RIGHT_DOWN, self._onRightButtonDown)
          self.Bind(wx.EVT_RIGHT_DCLICK, self._onRightButtonDClick)
          self.Bind(wx.EVT_RIGHT_UP, self._onRightButtonUp)
          self.Bind(wx.EVT_MOUSEWHEEL, self._onMouseWheel)
          self.Bind(wx.EVT_LEFT_DOWN, self._onLeftButtonDown)
          self.Bind(wx.EVT_LEFT_DCLICK, self._onLeftButtonDClick)
          self.Bind(wx.EVT_LEFT_UP, self._onLeftButtonUp)
          self.Bind(wx.EVT_MOTION, self._onMotion)
          self.Bind(wx.EVT_LEAVE_WINDOW, self._onLeave)
          self.Bind(wx.EVT_ENTER_WINDOW, self._onEnter)
          self.Bind(wx.EVT_IDLE, self._onIdle)
          # Add middle button events
          self.Bind(wx.EVT_MIDDLE_DOWN, self._onMiddleButtonDown)
          self.Bind(wx.EVT_MIDDLE_DCLICK, self._onMiddleButtonDClick)
          self.Bind(wx.EVT_MIDDLE_UP, self._onMiddleButtonUp)
  
          self.Bind(wx.EVT_MOUSE_CAPTURE_CHANGED, self._onCaptureLost)
          self.Bind(wx.EVT_MOUSE_CAPTURE_LOST, self._onCaptureLost)
  
          if wx.VERSION_STRING < "2.9":
              # only needed in 2.8 to reduce flicker
              self.SetBackgroundStyle(wx.BG_STYLE_CUSTOM)
              self.Bind(wx.EVT_ERASE_BACKGROUND, self._onEraseBackground)
          else:
              # this does the same in 2.9+
              self.SetBackgroundStyle(wx.BG_STYLE_PAINT)
  
          self.macros = {}  # dict from wx id to seq of macros
  
      def Destroy(self, *args, **kwargs):
          wx.Panel.Destroy(self, *args, **kwargs)
  
      def Copy_to_Clipboard(self, event=None):
          "copy bitmap of canvas to system clipboard"
          bmp_obj = wx.BitmapDataObject()
          bmp_obj.SetBitmap(self.bitmap)
  
          if not wx.TheClipboard.IsOpened():
              open_success = wx.TheClipboard.Open()
              if open_success:
                  wx.TheClipboard.SetData(bmp_obj)
                  wx.TheClipboard.Close()
                  wx.TheClipboard.Flush()
  
      def draw_idle(self):
          """
          Delay rendering until the GUI is idle.
          """
          DEBUG_MSG("draw_idle()", 1, self)
          self._isDrawn = False  # Force redraw
  
          # Triggering a paint event is all that is needed to defer drawing
          # until later. The platform will send the event when it thinks it is
          # a good time (usually as soon as there are no other events pending).
          self.Refresh(eraseBackground=False)
  
      def draw(self, drawDC=None):
          """
          Render the figure using RendererWx instance renderer, or using a
          previously defined renderer if none is specified.
          """
          DEBUG_MSG("draw()", 1, self)
          self.renderer = RendererWx(self.bitmap, self.figure.dpi)
          self.figure.draw(self.renderer)
          self._isDrawn = True
          self.gui_repaint(drawDC=drawDC)
  
      def new_timer(self, *args, **kwargs):
          """
          Creates a new backend-specific subclass of
          :class:`backend_bases.Timer`. This is useful for getting periodic
          events through the backend's native event loop. Implemented only
          for backends with GUIs.
  
          optional arguments:
  
          *interval*
            Timer interval in milliseconds
          *callbacks*
            Sequence of (func, args, kwargs) where func(*args, **kwargs) will
            be executed by the timer every *interval*.
          """
          return TimerWx(self, *args, **kwargs)
  
      def flush_events(self):
          wx.Yield()
  
      def start_event_loop(self, timeout=0):
          """
          Start an event loop.  This is used to start a blocking event
          loop so that interactive functions, such as ginput and
          waitforbuttonpress, can wait for events.  This should not be
          confused with the main GUI event loop, which is always running
          and has nothing to do with this.
  
          This call blocks until a callback function triggers
          stop_event_loop() or *timeout* is reached.  If *timeout* is
          <=0, never timeout.
  
          Raises RuntimeError if event loop is already running.
          """
          if hasattr(self, '_event_loop'):
              raise RuntimeError("Event loop already running")
          id = wx.NewId()
          timer = wx.Timer(self, id=id)
          if timeout > 0:
              timer.Start(timeout * 1000, oneShot=True)
              self.Bind(wx.EVT_TIMER, self.stop_event_loop, id=id)
  
          # Event loop handler for start/stop event loop
          self._event_loop = wxc.EventLoop()
          self._event_loop.Run()
          timer.Stop()
  
      def stop_event_loop(self, event=None):
          """
          Stop an event loop.  This is used to stop a blocking event
          loop so that interactive functions, such as ginput and
          waitforbuttonpress, can wait for events.
  
          """
          if hasattr(self, '_event_loop'):
              if self._event_loop.IsRunning():
                  self._event_loop.Exit()
              del self._event_loop
  
      def _get_imagesave_wildcards(self):
          'return the wildcard string for the filesave dialog'
          default_filetype = self.get_default_filetype()
          filetypes = self.get_supported_filetypes_grouped()
          sorted_filetypes = sorted(filetypes.items())
          wildcards = []
          extensions = []
          filter_index = 0
          for i, (name, exts) in enumerate(sorted_filetypes):
              ext_list = ';'.join(['*.%s' % ext for ext in exts])
              extensions.append(exts[0])
              wildcard = '%s (%s)|%s' % (name, ext_list, ext_list)
              if default_filetype in exts:
                  filter_index = i
              wildcards.append(wildcard)
          wildcards = '|'.join(wildcards)
          return wildcards, extensions, filter_index
  
      def gui_repaint(self, drawDC=None, origin='WX'):
          """
          Performs update of the displayed image on the GUI canvas, using the
          supplied wx.PaintDC device context.
  
          The 'WXAgg' backend sets origin accordingly.
          """
          DEBUG_MSG("gui_repaint()", 1, self)
          if self.IsShownOnScreen():
              if not drawDC:
                  # not called from OnPaint use a ClientDC
                  drawDC = wx.ClientDC(self)
  
              # following is for 'WX' backend on Windows
              # the bitmap can not be in use by another DC,
              # see GraphicsContextWx._cache
              if wx.Platform == '__WXMSW__' and origin == 'WX':
                  img = self.bitmap.ConvertToImage()
                  bmp = img.ConvertToBitmap()
                  drawDC.DrawBitmap(bmp, 0, 0)
              else:
                  drawDC.DrawBitmap(self.bitmap, 0, 0)
  
      filetypes = FigureCanvasBase.filetypes.copy()
      filetypes['bmp'] = 'Windows bitmap'
      filetypes['jpeg'] = 'JPEG'
      filetypes['jpg'] = 'JPEG'
      filetypes['pcx'] = 'PCX'
      filetypes['png'] = 'Portable Network Graphics'
      filetypes['tif'] = 'Tagged Image Format File'
      filetypes['tiff'] = 'Tagged Image Format File'
      filetypes['xpm'] = 'X pixmap'
  
      def print_figure(self, filename, *args, **kwargs):
          # Use pure Agg renderer to draw
          FigureCanvasBase.print_figure(self, filename, *args, **kwargs)
          # Restore the current view; this is needed because the
          # artist contains methods rely on particular attributes
          # of the rendered figure for determining things like
          # bounding boxes.
          if self._isDrawn:
              self.draw()
  
      def print_bmp(self, filename, *args, **kwargs):
          return self._print_image(filename, wx.BITMAP_TYPE_BMP, *args, **kwargs)
  
      if not _has_pil:
          def print_jpeg(self, filename, *args, **kwargs):
              return self._print_image(filename, wx.BITMAP_TYPE_JPEG,
                                       *args, **kwargs)
          print_jpg = print_jpeg
  
      def print_pcx(self, filename, *args, **kwargs):
          return self._print_image(filename, wx.BITMAP_TYPE_PCX, *args, **kwargs)
  
      def print_png(self, filename, *args, **kwargs):
          return self._print_image(filename, wx.BITMAP_TYPE_PNG, *args, **kwargs)
  
      if not _has_pil:
          def print_tiff(self, filename, *args, **kwargs):
              return self._print_image(filename, wx.BITMAP_TYPE_TIF,
                                       *args, **kwargs)
          print_tif = print_tiff
  
      def print_xpm(self, filename, *args, **kwargs):
          return self._print_image(filename, wx.BITMAP_TYPE_XPM, *args, **kwargs)
  
      def _print_image(self, filename, filetype, *args, **kwargs):
          origBitmap = self.bitmap
  
          l, b, width, height = self.figure.bbox.bounds
          width = int(math.ceil(width))
          height = int(math.ceil(height))
  
          self.bitmap = wxc.EmptyBitmap(width, height)
  
          renderer = RendererWx(self.bitmap, self.figure.dpi)
  
          gc = renderer.new_gc()
  
          self.figure.draw(renderer)
  
          # image is the object that we call SaveFile on.
          image = self.bitmap
          # set the JPEG quality appropriately.  Unfortunately, it is only
          # possible to set the quality on a wx.Image object.  So if we
          # are saving a JPEG, convert the wx.Bitmap to a wx.Image,
          # and set the quality.
          if filetype == wx.BITMAP_TYPE_JPEG:
              jpeg_quality = kwargs.get('quality',
                                        rcParams['savefig.jpeg_quality'])
              image = self.bitmap.ConvertToImage()
              image.SetOption(wx.IMAGE_OPTION_QUALITY, str(jpeg_quality))
  
          # Now that we have rendered into the bitmap, save it
          # to the appropriate file type and clean up
          if is_string_like(filename):
              if not image.SaveFile(filename, filetype):
                  DEBUG_MSG('print_figure() file save error', 4, self)
                  raise RuntimeError(
                      'Could not save figure to %s\n' %
                      (filename))
          elif is_writable_file_like(filename):
              if not isinstance(image, wx.Image):
                  image = image.ConvertToImage()
              if not image.SaveStream(filename, filetype):
                  DEBUG_MSG('print_figure() file save error', 4, self)
                  raise RuntimeError(
                      'Could not save figure to %s\n' %
                      (filename))
  
          # Restore everything to normal
          self.bitmap = origBitmap
  
          # Note: draw is required here since bits of state about the
          # last renderer are strewn about the artist draw methods.  Do
          # not remove the draw without first verifying that these have
          # been cleaned up.  The artist contains() methods will fail
          # otherwise.
          if self._isDrawn:
              self.draw()
          self.Refresh()
  
      def _onPaint(self, evt):
          """
          Called when wxPaintEvt is generated
          """
  
          DEBUG_MSG("_onPaint()", 1, self)
          drawDC = wx.PaintDC(self)
          if not self._isDrawn:
              self.draw(drawDC=drawDC)
          else:
              self.gui_repaint(drawDC=drawDC)
          evt.Skip()
  
      def _onEraseBackground(self, evt):
          """
          Called when window is redrawn; since we are blitting the entire
          image, we can leave this blank to suppress flicker.
          """
          pass
  
      def _onSize(self, evt):
          """
          Called when wxEventSize is generated.
  
          In this application we attempt to resize to fit the window, so it
          is better to take the performance hit and redraw the whole window.
          """
  
          DEBUG_MSG("_onSize()", 2, self)
          # Create a new, correctly sized bitmap
          self._width, self._height = self.GetClientSize()
          self.bitmap = wxc.EmptyBitmap(self._width, self._height)
  
          self._isDrawn = False
  
          if self._width <= 1 or self._height <= 1:
              return  # Empty figure
  
          dpival = self.figure.dpi
          winch = self._width / dpival
          hinch = self._height / dpival
          self.figure.set_size_inches(winch, hinch, forward=False)
  
          # Rendering will happen on the associated paint event
          # so no need to do anything here except to make sure
          # the whole background is repainted.
          self.Refresh(eraseBackground=False)
          FigureCanvasBase.resize_event(self)
  
      def _get_key(self, evt):
  
          keyval = evt.KeyCode
          if keyval in self.keyvald:
              key = self.keyvald[keyval]
          elif keyval < 256:
              key = chr(keyval)
              # wx always returns an uppercase, so make it lowercase if the shift
              # key is not depressed (NOTE: this will not handle Caps Lock)
              if not evt.ShiftDown():
                  key = key.lower()
          else:
              key = None
  
          for meth, prefix in (
                  [evt.AltDown, 'alt'],
                  [evt.ControlDown, 'ctrl'], ):
              if meth():
                  key = '{0}+{1}'.format(prefix, key)
  
          return key
  
      def _onIdle(self, evt):
          'a GUI idle event'
          evt.Skip()
          FigureCanvasBase.idle_event(self, guiEvent=evt)
  
      def _onKeyDown(self, evt):
          """Capture key press."""
          key = self._get_key(evt)
          evt.Skip()
          FigureCanvasBase.key_press_event(self, key, guiEvent=evt)
  
      def _onKeyUp(self, evt):
          """Release key."""
          key = self._get_key(evt)
          # print 'release key', key
          evt.Skip()
          FigureCanvasBase.key_release_event(self, key, guiEvent=evt)
  
      def _set_capture(self, capture=True):
          """control wx mouse capture """
          if self.HasCapture():
              self.ReleaseMouse()
          if capture:
              self.CaptureMouse()
  
      def _onCaptureLost(self, evt):
          """Capture changed or lost"""
          self._set_capture(False)
  
      def _onRightButtonDown(self, evt):
          """Start measuring on an axis."""
          x = evt.GetX()
          y = self.figure.bbox.height - evt.GetY()
          evt.Skip()
          self._set_capture(True)
          FigureCanvasBase.button_press_event(self, x, y, 3, guiEvent=evt)
  
      def _onRightButtonDClick(self, evt):
          """Start measuring on an axis."""
          x = evt.GetX()
          y = self.figure.bbox.height - evt.GetY()
          evt.Skip()
          self._set_capture(True)
          FigureCanvasBase.button_press_event(self, x, y, 3,
                                              dblclick=True, guiEvent=evt)
  
      def _onRightButtonUp(self, evt):
          """End measuring on an axis."""
          x = evt.GetX()
          y = self.figure.bbox.height - evt.GetY()
          evt.Skip()
          self._set_capture(False)
          FigureCanvasBase.button_release_event(self, x, y, 3, guiEvent=evt)
  
      def _onLeftButtonDown(self, evt):
          """Start measuring on an axis."""
          x = evt.GetX()
          y = self.figure.bbox.height - evt.GetY()
          evt.Skip()
          self._set_capture(True)
          FigureCanvasBase.button_press_event(self, x, y, 1, guiEvent=evt)
  
      def _onLeftButtonDClick(self, evt):
          """Start measuring on an axis."""
          x = evt.GetX()
          y = self.figure.bbox.height - evt.GetY()
          evt.Skip()
          self._set_capture(True)
          FigureCanvasBase.button_press_event(self, x, y, 1,
                                              dblclick=True, guiEvent=evt)
  
      def _onLeftButtonUp(self, evt):
          """End measuring on an axis."""
          x = evt.GetX()
          y = self.figure.bbox.height - evt.GetY()
          # print 'release button', 1
          evt.Skip()
          self._set_capture(False)
          FigureCanvasBase.button_release_event(self, x, y, 1, guiEvent=evt)
  
      # Add middle button events
      def _onMiddleButtonDown(self, evt):
          """Start measuring on an axis."""
          x = evt.GetX()
          y = self.figure.bbox.height - evt.GetY()
          evt.Skip()
          self._set_capture(True)
          FigureCanvasBase.button_press_event(self, x, y, 2, guiEvent=evt)
  
      def _onMiddleButtonDClick(self, evt):
          """Start measuring on an axis."""
          x = evt.GetX()
          y = self.figure.bbox.height - evt.GetY()
          evt.Skip()
          self._set_capture(True)
          FigureCanvasBase.button_press_event(self, x, y, 2,
                                              dblclick=True, guiEvent=evt)
  
      def _onMiddleButtonUp(self, evt):
          """End measuring on an axis."""
          x = evt.GetX()
          y = self.figure.bbox.height - evt.GetY()
          # print 'release button', 1
          evt.Skip()
          self._set_capture(False)
          FigureCanvasBase.button_release_event(self, x, y, 2, guiEvent=evt)
  
      def _onMouseWheel(self, evt):
          """Translate mouse wheel events into matplotlib events"""
  
          # Determine mouse location
          x = evt.GetX()
          y = self.figure.bbox.height - evt.GetY()
  
          # Convert delta/rotation/rate into a floating point step size
          delta = evt.GetWheelDelta()
          rotation = evt.GetWheelRotation()
          rate = evt.GetLinesPerAction()
          # print "delta,rotation,rate",delta,rotation,rate
          step = rate * float(rotation) / delta
  
          # Done handling event
          evt.Skip()
  
          # Mac is giving two events for every wheel event
          # Need to skip every second one
          if wx.Platform == '__WXMAC__':
              if not hasattr(self, '_skipwheelevent'):
                  self._skipwheelevent = True
              elif self._skipwheelevent:
                  self._skipwheelevent = False
                  return  # Return without processing event
              else:
                  self._skipwheelevent = True
  
          # Convert to mpl event
          FigureCanvasBase.scroll_event(self, x, y, step, guiEvent=evt)
  
      def _onMotion(self, evt):
          """Start measuring on an axis."""
  
          x = evt.GetX()
          y = self.figure.bbox.height - evt.GetY()
          evt.Skip()
          FigureCanvasBase.motion_notify_event(self, x, y, guiEvent=evt)
  
      def _onLeave(self, evt):
          """Mouse has left the window."""
  
          evt.Skip()
          FigureCanvasBase.leave_notify_event(self, guiEvent=evt)
  
      def _onEnter(self, evt):
          """Mouse has entered the window."""
          FigureCanvasBase.enter_notify_event(self, guiEvent=evt)
  
  
  ########################################################################
  #
  # The following functions and classes are for pylab compatibility
  # mode (matplotlib.pylab) and implement figure managers, etc...
  #
  ########################################################################
  
  
  def _create_wx_app():
      """
      Creates a wx.App instance if it has not been created sofar.
      """
      wxapp = wx.GetApp()
      if wxapp is None:
          wxapp = wx.App(False)
          wxapp.SetExitOnFrameDelete(True)
          # retain a reference to the app object so it does not get garbage
          # collected and cause segmentation faults
          _create_wx_app.theWxApp = wxapp
  
  
  def draw_if_interactive():
      """
      This should be overriden in a windowing environment if drawing
      should be done in interactive python mode
      """
      DEBUG_MSG("draw_if_interactive()", 1, None)
  
      if matplotlib.is_interactive():
  
          figManager = Gcf.get_active()
          if figManager is not None:
              figManager.canvas.draw_idle()
  
  
  class Show(ShowBase):
      def mainloop(self):
          needmain = not wx.App.IsMainLoopRunning()
          if needmain:
              wxapp = wx.GetApp()
              if wxapp is not None:
                  wxapp.MainLoop()
  
  show = Show()
  
  
  def new_figure_manager(num, *args, **kwargs):
      """
      Create a new figure manager instance
      """
      # in order to expose the Figure constructor to the pylab
      # interface we need to create the figure here
      DEBUG_MSG("new_figure_manager()", 3, None)
      _create_wx_app()
  
      FigureClass = kwargs.pop('FigureClass', Figure)
      fig = FigureClass(*args, **kwargs)
      return new_figure_manager_given_figure(num, fig)
  
  
  def new_figure_manager_given_figure(num, figure):
      """
      Create a new figure manager instance for the given figure.
      """
      fig = figure
      frame = FigureFrameWx(num, fig)
      figmgr = frame.get_figure_manager()
      if matplotlib.is_interactive():
          figmgr.frame.Show()
          figure.canvas.draw_idle()
  
      return figmgr
  
  
  class FigureFrameWx(wx.Frame):
      def __init__(self, num, fig):
          # On non-Windows platform, explicitly set the position - fix
          # positioning bug on some Linux platforms
          if wx.Platform == '__WXMSW__':
              pos = wx.DefaultPosition
          else:
              pos = wx.Point(20, 20)
          l, b, w, h = fig.bbox.bounds
          wx.Frame.__init__(self, parent=None, id=-1, pos=pos,
                            title="Figure %d" % num)
          # Frame will be sized later by the Fit method
          DEBUG_MSG("__init__()", 1, self)
          self.num = num
  
          statbar = StatusBarWx(self)
          self.SetStatusBar(statbar)
          self.canvas = self.get_canvas(fig)
          self.canvas.SetInitialSize(wx.Size(fig.bbox.width, fig.bbox.height))
          self.canvas.SetFocus()
          self.sizer = wx.BoxSizer(wx.VERTICAL)
          self.sizer.Add(self.canvas, 1, wx.TOP | wx.LEFT | wx.EXPAND)
          # By adding toolbar in sizer, we are able to put it at the bottom
          # of the frame - so appearance is closer to GTK version
  
          self.toolbar = self._get_toolbar(statbar)
  
          if self.toolbar is not None:
              self.toolbar.Realize()
              # On Windows platform, default window size is incorrect, so set
              # toolbar width to figure width.
              if wxc.is_phoenix:
                  tw, th = self.toolbar.GetSize()
                  fw, fh = self.canvas.GetSize()
              else:
                  tw, th = self.toolbar.GetSizeTuple()
                  fw, fh = self.canvas.GetSizeTuple()
              # By adding toolbar in sizer, we are able to put it at the bottom
              # of the frame - so appearance is closer to GTK version.
              self.toolbar.SetSize(wx.Size(fw, th))
              self.sizer.Add(self.toolbar, 0, wx.LEFT | wx.EXPAND)
          self.SetSizer(self.sizer)
          self.Fit()
  
          self.canvas.SetMinSize((2, 2))
  
          # give the window a matplotlib icon rather than the stock one.
          # This is not currently working on Linux and is untested elsewhere.
          # icon_path = os.path.join(matplotlib.rcParams['datapath'],
          #                         'images', 'matplotlib.png')
          #icon = wx.IconFromBitmap(wx.Bitmap(icon_path))
          # for xpm type icons try:
          #icon = wx.Icon(icon_path, wx.BITMAP_TYPE_XPM)
          # self.SetIcon(icon)
  
          self.figmgr = FigureManagerWx(self.canvas, num, self)
  
          self.Bind(wx.EVT_CLOSE, self._onClose)
  
      def _get_toolbar(self, statbar):
          if rcParams['toolbar'] == 'toolbar2':
              toolbar = NavigationToolbar2Wx(self.canvas)
              toolbar.set_status_bar(statbar)
          else:
              toolbar = None
          return toolbar
  
      def get_canvas(self, fig):
          return FigureCanvasWx(self, -1, fig)
  
      def get_figure_manager(self):
          DEBUG_MSG("get_figure_manager()", 1, self)
          return self.figmgr
  
      def _onClose(self, evt):
          DEBUG_MSG("onClose()", 1, self)
          self.canvas.close_event()
          self.canvas.stop_event_loop()
          Gcf.destroy(self.num)
          # self.Destroy()
  
      def GetToolBar(self):
          """Override wxFrame::GetToolBar as we don't have managed toolbar"""
          return self.toolbar
  
      def Destroy(self, *args, **kwargs):
          try:
              self.canvas.mpl_disconnect(self.toolbar._idDrag)
              # Rationale for line above: see issue 2941338.
          except AttributeError:
              pass  # classic toolbar lacks the attribute
          if not self.IsBeingDeleted():
              wx.Frame.Destroy(self, *args, **kwargs)
              if self.toolbar is not None:
                  self.toolbar.Destroy()
              wxapp = wx.GetApp()
              if wxapp:
                  wxapp.Yield()
          return True
  
  
  class FigureManagerWx(FigureManagerBase):
      """
      This class contains the FigureCanvas and GUI frame
  
      It is instantiated by GcfWx whenever a new figure is created. GcfWx is
      responsible for managing multiple instances of FigureManagerWx.
  
      public attrs
  
      canvas - a FigureCanvasWx(wx.Panel) instance
      window - a wxFrame instance - wxpython.org/Phoenix/docs/html/Frame.html
      """
  
      def __init__(self, canvas, num, frame):
          DEBUG_MSG("__init__()", 1, self)
          FigureManagerBase.__init__(self, canvas, num)
          self.frame = frame
          self.window = frame
  
          self.tb = frame.GetToolBar()
          self.toolbar = self.tb  # consistent with other backends
  
          def notify_axes_change(fig):
              'this will be called whenever the current axes is changed'
              if self.tb is not None:
                  self.tb.update()
          self.canvas.figure.add_axobserver(notify_axes_change)
  
      def show(self):
          self.frame.Show()
          self.canvas.draw()
  
      def destroy(self, *args):
          DEBUG_MSG("destroy()", 1, self)
          self.frame.Destroy()
          wxapp = wx.GetApp()
          if wxapp:
              wxapp.Yield()
  
      def get_window_title(self):
          return self.window.GetTitle()
  
      def set_window_title(self, title):
          self.window.SetTitle(title)
  
      def resize(self, width, height):
          'Set the canvas size in pixels'
          self.canvas.SetInitialSize(wx.Size(width, height))
          self.window.GetSizer().Fit(self.window)
  
  # Identifiers for toolbar controls - images_wx contains bitmaps for the images
  # used in the controls. wxWindows does not provide any stock images, so I've
  # 'stolen' those from GTK2, and transformed them into the appropriate format.
  #import images_wx
  
  _NTB_AXISMENU = wx.NewId()
  _NTB_AXISMENU_BUTTON = wx.NewId()
  _NTB_X_PAN_LEFT = wx.NewId()
  _NTB_X_PAN_RIGHT = wx.NewId()
  _NTB_X_ZOOMIN = wx.NewId()
  _NTB_X_ZOOMOUT = wx.NewId()
  _NTB_Y_PAN_UP = wx.NewId()
  _NTB_Y_PAN_DOWN = wx.NewId()
  _NTB_Y_ZOOMIN = wx.NewId()
  _NTB_Y_ZOOMOUT = wx.NewId()
  #_NTB_SUBPLOT            =wx.NewId()
  _NTB_SAVE = wx.NewId()
  _NTB_CLOSE = wx.NewId()
  
  
  def _load_bitmap(filename):
      """
      Load a bitmap file from the backends/images subdirectory in which the
      matplotlib library is installed. The filename parameter should not
      contain any path information as this is determined automatically.
  
      Returns a wx.Bitmap object
      """
  
      basedir = os.path.join(rcParams['datapath'], 'images')
  
      bmpFilename = os.path.normpath(os.path.join(basedir, filename))
      if not os.path.exists(bmpFilename):
          raise IOError('Could not find bitmap file "%s"; dying' % bmpFilename)
  
      bmp = wx.Bitmap(bmpFilename)
      return bmp
  
  
  class MenuButtonWx(wx.Button):
      """
      wxPython does not permit a menu to be incorporated directly into a toolbar.
      This class simulates the effect by associating a pop-up menu with a button
      in the toolbar, and managing this as though it were a menu.
      """
  
      def __init__(self, parent):
  
          wx.Button.__init__(self, parent, _NTB_AXISMENU_BUTTON, "Axes:        ",
                             style=wx.BU_EXACTFIT)
          self._toolbar = parent
          self._menu = wx.Menu()
          self._axisId = []
          # First two menu items never change...
          self._allId = wx.NewId()
          self._invertId = wx.NewId()
          self._menu.Append(self._allId, "All", "Select all axes", False)
          self._menu.Append(self._invertId, "Invert", "Invert axes selected",
                            False)
          self._menu.AppendSeparator()
  
          self.Bind(wx.EVT_BUTTON, self._onMenuButton, id=_NTB_AXISMENU_BUTTON)
          self.Bind(wx.EVT_MENU, self._handleSelectAllAxes, id=self._allId)
          self.Bind(wx.EVT_MENU, self._handleInvertAxesSelected,
                    id=self._invertId)
  
      def Destroy(self):
          self._menu.Destroy()
          self.Destroy()
  
      def _onMenuButton(self, evt):
          """Handle menu button pressed."""
          if wxc.is_phoenix:
              x, y = self.GetPosition()
              w, h = self.GetSize()
          else:
              x, y = self.GetPositionTuple()
              w, h = self.GetSizeTuple()
          self.PopupMenuXY(self._menu, x, y + h - 4)
          # When menu returned, indicate selection in button
          evt.Skip()
  
      def _handleSelectAllAxes(self, evt):
          """Called when the 'select all axes' menu item is selected."""
          if len(self._axisId) == 0:
              return
          for i in range(len(self._axisId)):
              self._menu.Check(self._axisId[i], True)
          self._toolbar.set_active(self.getActiveAxes())
          evt.Skip()
  
      def _handleInvertAxesSelected(self, evt):
          """Called when the invert all menu item is selected"""
          if len(self._axisId) == 0:
              return
          for i in range(len(self._axisId)):
              if self._menu.IsChecked(self._axisId[i]):
                  self._menu.Check(self._axisId[i], False)
              else:
                  self._menu.Check(self._axisId[i], True)
          self._toolbar.set_active(self.getActiveAxes())
          evt.Skip()
  
      def _onMenuItemSelected(self, evt):
          """Called whenever one of the specific axis menu items is selected"""
          current = self._menu.IsChecked(evt.GetId())
          if current:
              new = False
          else:
              new = True
          self._menu.Check(evt.GetId(), new)
          # Lines above would be deleted based on svn tracker ID 2841525;
          # not clear whether this matters or not.
          self._toolbar.set_active(self.getActiveAxes())
          evt.Skip()
  
      def updateAxes(self, maxAxis):
          """Ensures that there are entries for max_axis axes in the menu
          (selected by default)."""
          if maxAxis > len(self._axisId):
              for i in range(len(self._axisId) + 1, maxAxis + 1, 1):
                  menuId = wx.NewId()
                  self._axisId.append(menuId)
                  self._menu.Append(menuId, "Axis %d" % i,
                                    "Select axis %d" % i,
                                    True)
                  self._menu.Check(menuId, True)
                  self.Bind(wx.EVT_MENU, self._onMenuItemSelected, id=menuId)
          elif maxAxis < len(self._axisId):
              for menuId in self._axisId[maxAxis:]:
                  self._menu.Delete(menuId)
              self._axisId = self._axisId[:maxAxis]
          self._toolbar.set_active(list(xrange(maxAxis)))
  
      def getActiveAxes(self):
          """Return a list of the selected axes."""
          active = []
          for i in range(len(self._axisId)):
              if self._menu.IsChecked(self._axisId[i]):
                  active.append(i)
          return active
  
      def updateButtonText(self, lst):
          """Update the list of selected axes in the menu button"""
          axis_txt = ''
          for e in lst:
              axis_txt += '%d,' % (e + 1)
          # remove trailing ',' and add to button string
          self.SetLabel("Axes: %s" % axis_txt[:-1])
  
  
  cursord = {
      cursors.MOVE: wx.CURSOR_HAND,
      cursors.HAND: wx.CURSOR_HAND,
      cursors.POINTER: wx.CURSOR_ARROW,
      cursors.SELECT_REGION: wx.CURSOR_CROSS,
  }
  
  
  class SubplotToolWX(wx.Frame):
      def __init__(self, targetfig):
          wx.Frame.__init__(self, None, -1, "Configure subplots")
  
          toolfig = Figure((6, 3))
          canvas = FigureCanvasWx(self, -1, toolfig)
  
          # Create a figure manager to manage things
          figmgr = FigureManager(canvas, 1, self)
  
          # Now put all into a sizer
          sizer = wx.BoxSizer(wx.VERTICAL)
          # This way of adding to sizer allows resizing
          sizer.Add(canvas, 1, wx.LEFT | wx.TOP | wx.GROW)
          self.SetSizer(sizer)
          self.Fit()
          tool = SubplotTool(targetfig, toolfig)
  
  
  class NavigationToolbar2Wx(NavigationToolbar2, wx.ToolBar):
      def __init__(self, canvas):
          wx.ToolBar.__init__(self, canvas.GetParent(), -1)
          NavigationToolbar2.__init__(self, canvas)
          self.canvas = canvas
          self._idle = True
          self.statbar = None
          self.prevZoomRect = None
          # for now, use alternate zoom-rectangle drawing on all
          # Macs. N.B. In future versions of wx it may be possible to
          # detect Retina displays with window.GetContentScaleFactor()
          # and/or dc.GetContentScaleFactor()
          self.retinaFix = 'wxMac' in wx.PlatformInfo
  
      def get_canvas(self, frame, fig):
          return FigureCanvasWx(frame, -1, fig)
  
      def _init_toolbar(self):
          DEBUG_MSG("_init_toolbar", 1, self)
  
          self._parent = self.canvas.GetParent()
  
          self.wx_ids = {}
          for text, tooltip_text, image_file, callback in self.toolitems:
              if text is None:
                  self.AddSeparator()
                  continue
              self.wx_ids[text] = wx.NewId()
              wxc._AddTool(self, self.wx_ids, text,
                          _load_bitmap(image_file + '.png'),
                          tooltip_text)
  
              self.Bind(wx.EVT_TOOL, getattr(self, callback),
                        id=self.wx_ids[text])
  
          self.Realize()
  
      def zoom(self, *args):
          self.ToggleTool(self.wx_ids['Pan'], False)
          NavigationToolbar2.zoom(self, *args)
  
      def pan(self, *args):
          self.ToggleTool(self.wx_ids['Zoom'], False)
          NavigationToolbar2.pan(self, *args)
  
      def configure_subplots(self, evt):
          frame = wx.Frame(None, -1, "Configure subplots")
  
          toolfig = Figure((6, 3))
          canvas = self.get_canvas(frame, toolfig)
  
          # Create a figure manager to manage things
          figmgr = FigureManager(canvas, 1, frame)
  
          # Now put all into a sizer
          sizer = wx.BoxSizer(wx.VERTICAL)
          # This way of adding to sizer allows resizing
          sizer.Add(canvas, 1, wx.LEFT | wx.TOP | wx.GROW)
          frame.SetSizer(sizer)
          frame.Fit()
          tool = SubplotTool(self.canvas.figure, toolfig)
          frame.Show()
  
      def save_figure(self, *args):
          # Fetch the required filename and file type.
          filetypes, exts, filter_index = self.canvas._get_imagesave_wildcards()
          default_file = self.canvas.get_default_filename()
          dlg = wx.FileDialog(self._parent, "Save to file", "", default_file,
                              filetypes,
                              wx.FD_SAVE | wx.FD_OVERWRITE_PROMPT)
          dlg.SetFilterIndex(filter_index)
          if dlg.ShowModal() == wx.ID_OK:
              dirname = dlg.GetDirectory()
              filename = dlg.GetFilename()
              DEBUG_MSG(
                  'Save file dir:%s name:%s' %
                  (dirname, filename), 3, self)
              format = exts[dlg.GetFilterIndex()]
              basename, ext = os.path.splitext(filename)
              if ext.startswith('.'):
                  ext = ext[1:]
              if ext in ('svg', 'pdf', 'ps', 'eps', 'png') and format != ext:
                  # looks like they forgot to set the image type drop
                  # down, going with the extension.
                  warnings.warn(
                      'extension %s did not match the selected '
                      'image type %s; going with %s' %
                      (ext, format, ext), stacklevel=0)
                  format = ext
              try:
                  self.canvas.print_figure(
                      os.path.join(dirname, filename), format=format)
              except Exception as e:
                  error_msg_wx(str(e))
  
      def set_cursor(self, cursor):
          cursor = wxc.Cursor(cursord[cursor])
          self.canvas.SetCursor(cursor)
  
      def release(self, event):
          try:
              del self.lastrect
          except AttributeError:
              pass
  
      def dynamic_update(self):
          d = self._idle
          self._idle = False
          if d:
              self.canvas.draw()
              self._idle = True
  
      def press(self, event):
          if self._active == 'ZOOM':
              if not self.retinaFix:
                  self.wxoverlay = wx.Overlay()
              else:
                  self.savedRetinaImage = self.canvas.copy_from_bbox(
                      self.canvas.figure.gca().bbox)
                  self.zoomStartX = event.xdata
                  self.zoomStartY = event.ydata
  
      def release(self, event):
          if self._active == 'ZOOM':
              # When the mouse is released we reset the overlay and it
              # restores the former content to the window.
              if not self.retinaFix:
                  self.wxoverlay.Reset()
                  del self.wxoverlay
              else:
                  del self.savedRetinaImage
                  if self.prevZoomRect:
                      self.prevZoomRect.pop(0).remove()
                      self.prevZoomRect = None
  
      def draw_rubberband(self, event, x0, y0, x1, y1):
          if self.retinaFix:  # On Macs, use the following code
              # wx.DCOverlay does not work properly on Retina displays.
              rubberBandColor = '#C0C0FF'
              if self.prevZoomRect:
                  self.prevZoomRect.pop(0).remove()
              self.canvas.restore_region(self.savedRetinaImage)
              X0, X1 = self.zoomStartX, event.xdata
              Y0, Y1 = self.zoomStartY, event.ydata
              lineX = (X0, X0, X1, X1, X0)
              lineY = (Y0, Y1, Y1, Y0, Y0)
              self.prevZoomRect = self.canvas.figure.gca().plot(
                  lineX, lineY, '-', color=rubberBandColor)
              self.canvas.figure.gca().draw_artist(self.prevZoomRect[0])
              self.canvas.blit(self.canvas.figure.gca().bbox)
              return
  
          # Use an Overlay to draw a rubberband-like bounding box.
  
          dc = wx.ClientDC(self.canvas)
          odc = wx.DCOverlay(self.wxoverlay, dc)
          odc.Clear()
  
          # Mac's DC is already the same as a GCDC, and it causes
          # problems with the overlay if we try to use an actual
          # wx.GCDC so don't try it.
          if 'wxMac' not in wx.PlatformInfo:
              dc = wx.GCDC(dc)
  
          height = self.canvas.figure.bbox.height
          y1 = height - y1
          y0 = height - y0
  
          if y1 < y0:
              y0, y1 = y1, y0
          if x1 < y0:
              x0, x1 = x1, x0
  
          w = x1 - x0
          h = y1 - y0
          rect = wx.Rect(x0, y0, w, h)
  
          rubberBandColor = '#C0C0FF'  # or load from config?
  
          # Set a pen for the border
          color = wxc.NamedColour(rubberBandColor)
          dc.SetPen(wx.Pen(color, 1))
  
          # use the same color, plus alpha for the brush
          r, g, b, a = color.Get(True)
          color.Set(r, g, b, 0x60)
          dc.SetBrush(wx.Brush(color))
          if wxc.is_phoenix:
              dc.DrawRectangle(rect)
          else:
              dc.DrawRectangleRect(rect)
  
      def set_status_bar(self, statbar):
          self.statbar = statbar
  
      def set_message(self, s):
          if self.statbar is not None:
              self.statbar.set_function(s)
  
      def set_history_buttons(self):
          can_backward = (self._views._pos > 0)
          can_forward = (self._views._pos < len(self._views._elements) - 1)
          self.EnableTool(self.wx_ids['Back'], can_backward)
          self.EnableTool(self.wx_ids['Forward'], can_forward)
  
  
  class StatusBarWx(wx.StatusBar):
      """
      A status bar is added to _FigureFrame to allow measurements and the
      previously selected scroll function to be displayed as a user
      convenience.
      """
  
      def __init__(self, parent):
          wx.StatusBar.__init__(self, parent, -1)
          self.SetFieldsCount(2)
          self.SetStatusText("None", 1)
          #self.SetStatusText("Measurement: None", 2)
          # self.Reposition()
  
      def set_function(self, string):
          self.SetStatusText("%s" % string, 1)
  
      # def set_measurement(self, string):
      #    self.SetStatusText("Measurement: %s" % string, 2)
  
  
  #< Additions for printing support: Matt Newville
  
  class PrintoutWx(wx.Printout):
      """
      Simple wrapper around wx Printout class -- all the real work
      here is scaling the matplotlib canvas bitmap to the current
      printer's definition.
      """
  
      def __init__(self, canvas, width=5.5, margin=0.5, title='matplotlib'):
          wx.Printout.__init__(self, title=title)
          self.canvas = canvas
          # width, in inches of output figure (approximate)
          self.width = width
          self.margin = margin
  
      def HasPage(self, page):
          # current only supports 1 page print
          return page == 1
  
      def GetPageInfo(self):
          return (1, 1, 1, 1)
  
      def OnPrintPage(self, page):
          self.canvas.draw()
  
          dc = self.GetDC()
          (ppw, pph) = self.GetPPIPrinter()      # printer's pixels per in
          (pgw, pgh) = self.GetPageSizePixels()  # page size in pixels
          (dcw, dch) = dc.GetSize()
          if wxc.is_phoenix:
              (grw, grh) = self.canvas.GetSize()
          else:
              (grw, grh) = self.canvas.GetSizeTuple()
  
          # save current figure dpi resolution and bg color,
          # so that we can temporarily set them to the dpi of
          # the printer, and the bg color to white
          bgcolor = self.canvas.figure.get_facecolor()
          fig_dpi = self.canvas.figure.dpi
  
          # draw the bitmap, scaled appropriately
          vscale = float(ppw) / fig_dpi
  
          # set figure resolution,bg color for printer
          self.canvas.figure.dpi = ppw
          self.canvas.figure.set_facecolor('#FFFFFF')
  
          renderer = RendererWx(self.canvas.bitmap, self.canvas.figure.dpi)
          self.canvas.figure.draw(renderer)
          self.canvas.bitmap.SetWidth(
              int(self.canvas.bitmap.GetWidth() * vscale))
          self.canvas.bitmap.SetHeight(
              int(self.canvas.bitmap.GetHeight() * vscale))
          self.canvas.draw()
  
          # page may need additional scaling on preview
          page_scale = 1.0
          if self.IsPreview():
              page_scale = float(dcw) / pgw
  
          # get margin in pixels = (margin in in) * (pixels/in)
          top_margin = int(self.margin * pph * page_scale)
          left_margin = int(self.margin * ppw * page_scale)
  
          # set scale so that width of output is self.width inches
          # (assuming grw is size of graph in inches....)
          user_scale = (self.width * fig_dpi * page_scale) / float(grw)
  
          dc.SetDeviceOrigin(left_margin, top_margin)
          dc.SetUserScale(user_scale, user_scale)
  
          # this cute little number avoid API inconsistencies in wx
          try:
              dc.DrawBitmap(self.canvas.bitmap, 0, 0)
          except:
              try:
                  dc.DrawBitmap(self.canvas.bitmap, (0, 0))
              except:
                  pass
  
          # restore original figure  resolution
          self.canvas.figure.set_facecolor(bgcolor)
          self.canvas.figure.dpi = fig_dpi
          self.canvas.draw()
          return True
  #>
  
  ########################################################################
  #
  # Now just provide the standard names that backend.__init__ is expecting
  #
  ########################################################################
  
  FigureCanvas = FigureCanvasWx
  FigureManager = FigureManagerWx
  Toolbar = NavigationToolbar2Wx
  