text: """
  The legend module defines the Legend class, which is responsible for
  drawing legends associated with axes and/or figures.
  
  The Legend class can be considered as a container of legend handles
  and legend texts. Creation of corresponding legend handles from the
  plot elements in the axes or figures (e.g., lines, patches, etc.) are
  specified by the handler map, which defines the mapping between the
  plot elements and the legend handlers to be used (the default legend
  handlers are defined in the :mod:`~matplotlib.legend_handler` module). Note
  that not all kinds of artist are supported by the legend yet (See
  :ref:`plotting-guide-legend` for more information).
  """
  from __future__ import division, print_function
  import warnings
  
  import numpy as np
  
  from matplotlib import rcParams
  from matplotlib.artist import Artist, allow_rasterization
  from matplotlib.cbook import is_string_like, iterable, silent_list, safezip
  from matplotlib.font_manager import FontProperties
  from matplotlib.lines import Line2D
  from matplotlib.patches import Patch, Rectangle, Shadow, FancyBboxPatch
  from matplotlib.collections import LineCollection, RegularPolyCollection, \
       CircleCollection, PathCollection
  from matplotlib.transforms import Bbox, BboxBase, TransformedBbox
  from matplotlib.transforms import BboxTransformTo, BboxTransformFrom
  
  from matplotlib.offsetbox import HPacker, VPacker, TextArea, DrawingArea
  from matplotlib.offsetbox import DraggableOffsetBox
  
  from matplotlib.container import ErrorbarContainer, BarContainer, StemContainer
  from matplotlib import MatplotlibDeprecationWarning as mplDeprecation
  import legend_handler
  
  
  class DraggableLegend(DraggableOffsetBox):
      def __init__(self, legend, use_blit=False, update="loc"):
          """
          update : If "loc", update *loc* parameter of
                   legend upon finalizing. If "bbox", update
                   *bbox_to_anchor* parameter.
          """
          self.legend = legend
  
          if update in ["loc", "bbox"]:
              self._update = update
          else:
              raise ValueError("update parameter '%s' is not supported." %
                               update)
  
          DraggableOffsetBox.__init__(self, legend, legend._legend_box,
                                      use_blit=use_blit)
  
      def artist_picker(self, legend, evt):
          return self.legend.contains(evt)
  
      def finalize_offset(self):
          loc_in_canvas = self.get_loc_in_canvas()
  
          if self._update == "loc":
              self._update_loc(loc_in_canvas)
          elif self._update == "bbox":
              self._update_bbox_to_anchor(loc_in_canvas)
          else:
              raise RuntimeError("update parameter '%s' is not supported." %
                                 self.update)
  
      def _update_loc(self, loc_in_canvas):
          bbox = self.legend.get_bbox_to_anchor()
  
          # if bbox has zero width or height, the transformation is
          # ill-defined. Fall back to the defaul bbox_to_anchor.
          if bbox.width == 0 or bbox.height == 0:
              self.legend.set_bbox_to_anchor(None)
              bbox = self.legend.get_bbox_to_anchor()
  
          _bbox_transform = BboxTransformFrom(bbox)
          self.legend._loc = tuple(
                              _bbox_transform.transform_point(loc_in_canvas))
  
      def _update_bbox_to_anchor(self, loc_in_canvas):
  
          tr = self.legend.axes.transAxes
          loc_in_bbox = tr.transform_point(loc_in_canvas)
  
          self.legend.set_bbox_to_anchor(loc_in_bbox)
  
  
  class Legend(Artist):
      """
      Place a legend on the axes at location loc.  Labels are a
      sequence of strings and loc can be a string or an integer
      specifying the legend location
  
      The location codes are::
  
        'best'         : 0, (only implemented for axis legends)
        'upper right'  : 1,
        'upper left'   : 2,
        'lower left'   : 3,
        'lower right'  : 4,
        'right'        : 5,
        'center left'  : 6,
        'center right' : 7,
        'lower center' : 8,
        'upper center' : 9,
        'center'       : 10,
  
      loc can be a tuple of the normalized coordinate values with
      respect its parent.
  
      """
      codes = {'best':         0,  # only implemented for axis legends
               'upper right':  1,
               'upper left':   2,
               'lower left':   3,
               'lower right':  4,
               'right':        5,
               'center left':  6,
               'center right': 7,
               'lower center': 8,
               'upper center': 9,
               'center':       10,
               }
  
      zorder = 5
  
      def __str__(self):
          return "Legend"
  
      def __init__(self, parent, handles, labels,
                   loc=None,
                   numpoints=None,    # the number of points in the legend line
                   markerscale=None,  # the relative size of legend markers
                                      # vs. original
                   scatterpoints=None,    # number of scatter points
                   scatteryoffsets=None,
                   prop=None,          # properties for the legend texts
                   fontsize=None,        # keyword to set font size directly
  
                   # the following dimensions are in axes coords
                   pad=None,            # deprecated; use borderpad
                   labelsep=None,       # deprecated; use labelspacing
                   handlelen=None,      # deprecated; use handlelength
                   handletextsep=None,  # deprecated; use handletextpad
                   axespad=None,        # deprecated; use borderaxespad
  
                   # spacing & pad defined as a fraction of the font-size
                   borderpad=None,      # the whitespace inside the legend border
                   labelspacing=None,   # the vertical space between the legend
                                        # entries
                   handlelength=None,   # the length of the legend handles
                   handleheight=None,   # the height of the legend handles
                   handletextpad=None,  # the pad between the legend handle
                                        # and text
                   borderaxespad=None,  # the pad between the axes and legend
                                        # border
                   columnspacing=None,  # spacing between columns
  
                   ncol=1,     # number of columns
                   mode=None,  # mode for horizontal distribution of columns.
                               # None, "expand"
  
                   fancybox=None,  # True use a fancy box, false use a rounded
                                   # box, none use rc
                   shadow=None,
                   title=None,  # set a title for the legend
  
                   framealpha=None, # set frame alpha
  
                   bbox_to_anchor=None,  # bbox that the legend will be anchored.
                   bbox_transform=None,  # transform for the bbox
                   frameon=None,  # draw frame
                   handler_map=None,
                   ):
          """
          - *parent*: the artist that contains the legend
          - *handles*: a list of artists (lines, patches) to be added to the
                        legend
          - *labels*: a list of strings to label the legend
  
          Optional keyword arguments:
  
          ================   ====================================================
          Keyword            Description
          ================   ====================================================
          loc                a location code
          prop               the font property
          fontsize           the font size (used only if prop is not specified)
          markerscale        the relative size of legend markers vs. original
          numpoints          the number of points in the legend for line
          scatterpoints      the number of points in the legend for scatter plot
          scatteryoffsets    a list of yoffsets for scatter symbols in legend
          frameon            if True, draw a frame around the legend.
                             If None, use rc
          fancybox           if True, draw a frame with a round fancybox.
                             If None, use rc
          shadow             if True, draw a shadow behind legend
          framealpha         If not None, alpha channel for the frame.
          ncol               number of columns
          borderpad          the fractional whitespace inside the legend border
          labelspacing       the vertical space between the legend entries
          handlelength       the length of the legend handles
          handleheight       the length of the legend handles
          handletextpad      the pad between the legend handle and text
          borderaxespad      the pad between the axes and legend border
          columnspacing      the spacing between columns
          title              the legend title
          bbox_to_anchor     the bbox that the legend will be anchored.
          bbox_transform     the transform for the bbox. transAxes if None.
          ================   ====================================================
  
  
          The pad and spacing parameters are measured in font-size units.  E.g.,
          a fontsize of 10 points and a handlelength=5 implies a handlelength of
          50 points.  Values from rcParams will be used if None.
  
          Users can specify any arbitrary location for the legend using the
          *bbox_to_anchor* keyword argument. bbox_to_anchor can be an instance
          of BboxBase(or its derivatives) or a tuple of 2 or 4 floats.
          See :meth:`set_bbox_to_anchor` for more detail.
  
          The legend location can be specified by setting *loc* with a tuple of
          2 floats, which is interpreted as the lower-left corner of the legend
          in the normalized axes coordinate.
          """
          # local import only to avoid circularity
          from matplotlib.axes import Axes
          from matplotlib.figure import Figure
  
          Artist.__init__(self)
  
          if prop is None:
              if fontsize is not None:
                  self.prop = FontProperties(size=fontsize)
              else:
                  self.prop = FontProperties(size=rcParams["legend.fontsize"])
          elif isinstance(prop, dict):
              self.prop = FontProperties(**prop)
              if "size" not in prop:
                  self.prop.set_size(rcParams["legend.fontsize"])
          else:
              self.prop = prop
  
          self._fontsize = self.prop.get_size_in_points()
  
          propnames = ["numpoints", "markerscale", "shadow", "columnspacing",
                       "scatterpoints", "handleheight"]
  
          self.texts = []
          self.legendHandles = []
          self._legend_title_box = None
  
          self._handler_map = handler_map
  
          localdict = locals()
  
          for name in propnames:
              if localdict[name] is None:
                  value = rcParams["legend." + name]
              else:
                  value = localdict[name]
              setattr(self, name, value)
  
          # Take care the deprecated keywords
          deprecated_kwds = {"pad": "borderpad",
                             "labelsep": "labelspacing",
                             "handlelen": "handlelength",
                             "handletextsep": "handletextpad",
                             "axespad": "borderaxespad"}
  
          # convert values of deprecated keywords (ginve in axes coords)
          # to new vaules in a fraction of the font size
  
          # conversion factor
          bbox = parent.bbox
          axessize_fontsize = min(bbox.width, bbox.height) / self._fontsize
  
          for k, v in deprecated_kwds.iteritems():
              # use deprecated value if not None and if their newer
              # counter part is None.
              if localdict[k] is not None and localdict[v] is None:
                  warnings.warn("Use '%s' instead of '%s'." % (v, k),
                                mplDeprecation)
                  setattr(self, v, localdict[k] * axessize_fontsize)
                  continue
  
              # Otherwise, use new keywords
              if localdict[v] is None:
                  setattr(self, v, rcParams["legend." + v])
              else:
                  setattr(self, v, localdict[v])
  
          del localdict
  
          handles = list(handles)
          if len(handles) < 2:
              ncol = 1
          self._ncol = ncol
  
          if self.numpoints <= 0:
              raise ValueError("numpoints must be > 0; it was %d" % numpoints)
  
          # introduce y-offset for handles of the scatter plot
          if scatteryoffsets is None:
              self._scatteryoffsets = np.array([3. / 8., 4. / 8., 2.5 / 8.])
          else:
              self._scatteryoffsets = np.asarray(scatteryoffsets)
          reps = int(self.scatterpoints / len(self._scatteryoffsets)) + 1
          self._scatteryoffsets = np.tile(self._scatteryoffsets,
                                          reps)[:self.scatterpoints]
  
          # _legend_box is an OffsetBox instance that contains all
          # legend items and will be initialized from _init_legend_box()
          # method.
          self._legend_box = None
  
          if isinstance(parent, Axes):
              self.isaxes = True
              self.set_axes(parent)
              self.set_figure(parent.figure)
          elif isinstance(parent, Figure):
              self.isaxes = False
              self.set_figure(parent)
          else:
              raise TypeError("Legend needs either Axes or Figure as parent")
          self.parent = parent
  
          if loc is None:
              loc = rcParams["legend.loc"]
              if not self.isaxes and loc in [0, 'best']:
                  loc = 'upper right'
          if is_string_like(loc):
              if loc not in self.codes:
                  if self.isaxes:
                      warnings.warn('Unrecognized location "%s". Falling back '
                                    'on "best"; valid locations are\n\t%s\n'
                                    % (loc, '\n\t'.join(self.codes.iterkeys())))
                      loc = 0
                  else:
                      warnings.warn('Unrecognized location "%s". Falling back '
                                    'on "upper right"; '
                                    'valid locations are\n\t%s\n'
                                     % (loc, '\n\t'.join(self.codes.iterkeys())))
                      loc = 1
              else:
                  loc = self.codes[loc]
          if not self.isaxes and loc == 0:
              warnings.warn('Automatic legend placement (loc="best") not '
                            'implemented for figure legend. '
                            'Falling back on "upper right".')
              loc = 1
  
          self._mode = mode
          self.set_bbox_to_anchor(bbox_to_anchor, bbox_transform)
  
          # We use FancyBboxPatch to draw a legend frame. The location
          # and size of the box will be updated during the drawing time.
  
          self.legendPatch = FancyBboxPatch(
              xy=(0.0, 0.0), width=1., height=1.,
              facecolor=rcParams["axes.facecolor"],
              edgecolor=rcParams["axes.edgecolor"],
              mutation_scale=self._fontsize,
              snap=True
              )
  
          # The width and height of the legendPatch will be set (in the
          # draw()) to the length that includes the padding. Thus we set
          # pad=0 here.
          if fancybox is None:
              fancybox = rcParams["legend.fancybox"]
  
          if fancybox:
              self.legendPatch.set_boxstyle("round", pad=0,
                                            rounding_size=0.2)
          else:
              self.legendPatch.set_boxstyle("square", pad=0)
  
          self._set_artist_props(self.legendPatch)
  
          self._drawFrame = frameon
          if frameon is None:
              self._drawFrame = rcParams["legend.frameon"]
  
          # init with null renderer
          self._init_legend_box(handles, labels)
  
          if framealpha is not None:
            self.get_frame().set_alpha(framealpha)
  
          self._loc = loc
  
          self.set_title(title)
  
          self._last_fontsize_points = self._fontsize
  
          self._draggable = None
  
      def _set_artist_props(self, a):
          """
          set the boilerplate props for artists added to axes
          """
          a.set_figure(self.figure)
          if self.isaxes:
              a.set_axes(self.axes)
          a.set_transform(self.get_transform())
  
      def _set_loc(self, loc):
          # find_offset function will be provided to _legend_box and
          # _legend_box will draw itself at the location of the return
          # value of the find_offset.
          self._loc_real = loc
          if loc == 0:
              _findoffset = self._findoffset_best
          else:
              _findoffset = self._findoffset_loc
  
          #def findoffset(width, height, xdescent, ydescent):
          #    return _findoffset(width, height, xdescent, ydescent, renderer)
  
          self._legend_box.set_offset(_findoffset)
  
          self._loc_real = loc
  
      def _get_loc(self):
          return self._loc_real
  
      _loc = property(_get_loc, _set_loc)
  
      def _findoffset_best(self, width, height, xdescent, ydescent, renderer):
          "Helper function to locate the legend at its best position"
          ox, oy = self._find_best_position(width, height, renderer)
          return ox + xdescent, oy + ydescent
  
      def _findoffset_loc(self, width, height, xdescent, ydescent, renderer):
          "Helper function to locate the legend using the location code"
  
          if iterable(self._loc) and len(self._loc) == 2:
              # when loc is a tuple of axes(or figure) coordinates.
              fx, fy = self._loc
              bbox = self.get_bbox_to_anchor()
              x, y = bbox.x0 + bbox.width * fx, bbox.y0 + bbox.height * fy
          else:
              bbox = Bbox.from_bounds(0, 0, width, height)
              x, y = self._get_anchored_bbox(self._loc, bbox,
                                             self.get_bbox_to_anchor(),
                                             renderer)
  
          return x + xdescent, y + ydescent
  
      @allow_rasterization
      def draw(self, renderer):
          "Draw everything that belongs to the legend"
          if not self.get_visible():
              return
  
          renderer.open_group('legend')
  
          fontsize = renderer.points_to_pixels(self._fontsize)
  
          # if mode == fill, set the width of the legend_box to the
          # width of the paret (minus pads)
          if self._mode in ["expand"]:
              pad = 2 * (self.borderaxespad + self.borderpad) * fontsize
              self._legend_box.set_width(self.get_bbox_to_anchor().width - pad)
  
          # update the location and size of the legend. This needs to
          # be done in any case to clip the figure right.
          bbox = self._legend_box.get_window_extent(renderer)
          self.legendPatch.set_bounds(bbox.x0, bbox.y0,
                                      bbox.width, bbox.height)
          self.legendPatch.set_mutation_scale(fontsize)
  
          if self._drawFrame:
              if self.shadow:
                  shadow = Shadow(self.legendPatch, 2, -2)
                  shadow.draw(renderer)
  
              self.legendPatch.draw(renderer)
  
          self._legend_box.draw(renderer)
  
          renderer.close_group('legend')
  
      def _approx_text_height(self, renderer=None):
          """
          Return the approximate height of the text. This is used to place
          the legend handle.
          """
          if renderer is None:
              return self._fontsize
          else:
              return renderer.points_to_pixels(self._fontsize)
  
      # _default_handler_map defines the default mapping between plot
      # elements and the legend handlers.
  
      _default_handler_map = {
          StemContainer: legend_handler.HandlerStem(),
          ErrorbarContainer: legend_handler.HandlerErrorbar(),
          Line2D: legend_handler.HandlerLine2D(),
          Patch: legend_handler.HandlerPatch(),
          LineCollection: legend_handler.HandlerLineCollection(),
          RegularPolyCollection: legend_handler.HandlerRegularPolyCollection(),
          CircleCollection: legend_handler.HandlerCircleCollection(),
          BarContainer: legend_handler.HandlerPatch(
                          update_func=legend_handler.update_from_first_child),
          tuple: legend_handler.HandlerTuple(),
          PathCollection: legend_handler.HandlerPathCollection()
          }
  
      # (get|set|update)_default_handler_maps are public interfaces to
      # modify the defalut handler map.
  
      @classmethod
      def get_default_handler_map(cls):
          """
          A class method that returns the default handler map.
          """
          return cls._default_handler_map
  
      @classmethod
      def set_default_handler_map(cls, handler_map):
          """
          A class method to set the default handler map.
          """
          cls._default_handler_map = handler_map
  
      @classmethod
      def update_default_handler_map(cls, handler_map):
          """
          A class method to update the default handler map.
          """
          cls._default_handler_map.update(handler_map)
  
      def get_legend_handler_map(self):
          """
          return the handler map.
          """
  
          default_handler_map = self.get_default_handler_map()
  
          if self._handler_map:
              hm = default_handler_map.copy()
              hm.update(self._handler_map)
              return hm
          else:
              return default_handler_map
  
      @staticmethod
      def get_legend_handler(legend_handler_map, orig_handle):
          """
          return a legend handler from *legend_handler_map* that
          corresponds to *orig_handler*.
  
          *legend_handler_map* should be a dictionary object (that is
          returned by the get_legend_handler_map method).
  
          It first checks if the *orig_handle* itself is a key in the
          *legend_hanler_map* and return the associated value.
          Otherwise, it checks for each of the classes in its
          method-resolution-order. If no matching key is found, it
          returns None.
          """
          legend_handler_keys = legend_handler_map.keys()
          if orig_handle in legend_handler_keys:
              handler = legend_handler_map[orig_handle]
          else:
  
              for handle_type in type(orig_handle).mro():
                  if handle_type in legend_handler_map:
                      handler = legend_handler_map[handle_type]
                      break
              else:
                  handler = None
  
          return handler
  
      def _init_legend_box(self, handles, labels):
          """
          Initialize the legend_box. The legend_box is an instance of
          the OffsetBox, which is packed with legend handles and
          texts. Once packed, their location is calculated during the
          drawing time.
          """
  
          fontsize = self._fontsize
  
          # legend_box is a HPacker, horizontally packed with
          # columns. Each column is a VPacker, vertically packed with
          # legend items. Each legend item is HPacker packed with
          # legend handleBox and labelBox. handleBox is an instance of
          # offsetbox.DrawingArea which contains legend handle. labelBox
          # is an instance of offsetbox.TextArea which contains legend
          # text.
  
          text_list = []  # the list of text instances
          handle_list = []  # the list of text instances
  
          label_prop = dict(verticalalignment='baseline',
                            horizontalalignment='left',
                            fontproperties=self.prop,
                            )
  
          labelboxes = []
          handleboxes = []
  
          # The approximate height and descent of text. These values are
          # only used for plotting the legend handle.
          descent = 0.35 * self._approx_text_height() * (self.handleheight - 0.7)
          # 0.35 and 0.7 are just heuristic numbers. this may need to be improbed
          height = self._approx_text_height() * self.handleheight - descent
          # each handle needs to be drawn inside a box of (x, y, w, h) =
          # (0, -descent, width, height).  And their coordinates should
          # be given in the display coordinates.
  
          # The transformation of each handle will be automatically set
          # to self.get_trasnform(). If the artist does not uses its
          # default trasnform (eg, Collections), you need to
          # manually set their transform to the self.get_transform().
  
          legend_handler_map = self.get_legend_handler_map()
  
          for orig_handle, lab in zip(handles, labels):
  
              handler = self.get_legend_handler(legend_handler_map, orig_handle)
  
              if handler is None:
                  warnings.warn(
                    "Legend does not support %s\nUse proxy artist "
                    "instead.\n\n"
                    "http://matplotlib.sourceforge.net/users/legend_guide.html#using-proxy-artist\n" %
                  (str(orig_handle),))
                  handle_list.append(None)
                  continue
  
              textbox = TextArea(lab, textprops=label_prop,
                                 multilinebaseline=True, minimumdescent=True)
              text_list.append(textbox._text)
  
              labelboxes.append(textbox)
  
              handlebox = DrawingArea(width=self.handlelength * fontsize,
                                      height=height,
                                      xdescent=0., ydescent=descent)
  
              handle = handler(self, orig_handle,
                               #xdescent, ydescent, width, height,
                               fontsize,
                               handlebox)
  
              handle_list.append(handle)
  
              handleboxes.append(handlebox)
  
          if len(handleboxes) > 0:
  
              # We calculate number of rows in each column. The first
              # (num_largecol) columns will have (nrows+1) rows, and remaining
              # (num_smallcol) columns will have (nrows) rows.
              ncol = min(self._ncol, len(handleboxes))
              nrows, num_largecol = divmod(len(handleboxes), ncol)
              num_smallcol = ncol - num_largecol
  
              # starting index of each column and number of rows in it.
              largecol = safezip(range(0,
                                       num_largecol * (nrows + 1),
                                       (nrows + 1)),
                                 [nrows + 1] * num_largecol)
              smallcol = safezip(range(num_largecol * (nrows + 1),
                                       len(handleboxes),
                                       nrows),
                                 [nrows] * num_smallcol)
          else:
              largecol, smallcol = [], []
  
          handle_label = safezip(handleboxes, labelboxes)
          columnbox = []
          for i0, di in largecol + smallcol:
              # pack handleBox and labelBox into itemBox
              itemBoxes = [HPacker(pad=0,
                                   sep=self.handletextpad * fontsize,
                                   children=[h, t], align="baseline")
                           for h, t in handle_label[i0:i0 + di]]
              # minimumdescent=False for the text of the last row of the column
              itemBoxes[-1].get_children()[1].set_minimumdescent(False)
  
              # pack columnBox
              columnbox.append(VPacker(pad=0,
                                          sep=self.labelspacing * fontsize,
                                          align="baseline",
                                          children=itemBoxes))
  
          if self._mode == "expand":
              mode = "expand"
          else:
              mode = "fixed"
  
          sep = self.columnspacing * fontsize
  
          self._legend_handle_box = HPacker(pad=0,
                                            sep=sep, align="baseline",
                                            mode=mode,
                                            children=columnbox)
  
          self._legend_title_box = TextArea("")
  
          self._legend_box = VPacker(pad=self.borderpad * fontsize,
                                     sep=self.labelspacing * fontsize,
                                     align="center",
                                     children=[self._legend_title_box,
                                               self._legend_handle_box])
  
          self._legend_box.set_figure(self.figure)
  
          self.texts = text_list
          self.legendHandles = handle_list
  
      def _auto_legend_data(self):
          """
          Returns list of vertices and extents covered by the plot.
  
          Returns a two long list.
  
          First element is a list of (x, y) vertices (in
          display-coordinates) covered by all the lines and line
          collections, in the legend's handles.
  
          Second element is a list of bounding boxes for all the patches in
          the legend's handles.
          """
          # should always hold because function is only called internally
          assert self.isaxes
  
          ax = self.parent
          bboxes = []
          lines = []
  
          for handle in ax.lines:
              assert isinstance(handle, Line2D)
              path = handle.get_path()
              trans = handle.get_transform()
              tpath = trans.transform_path(path)
              lines.append(tpath)
  
          for handle in ax.patches:
              assert isinstance(handle, Patch)
  
              if isinstance(handle, Rectangle):
                  transform = handle.get_data_transform()
                  bboxes.append(handle.get_bbox().transformed(transform))
              else:
                  transform = handle.get_transform()
                  bboxes.append(handle.get_path().get_extents(transform))
  
          try:
              vertices = np.concatenate([l.vertices for l in lines])
          except ValueError:
              vertices = np.array([])
  
          return [vertices, bboxes, lines]
  
      def draw_frame(self, b):
          'b is a boolean.  Set draw frame to b'
          self.set_frame_on(b)
  
      def get_children(self):
          'return a list of child artists'
          children = []
          if self._legend_box:
              children.append(self._legend_box)
          children.extend(self.get_lines())
          children.extend(self.get_patches())
          children.extend(self.get_texts())
          children.append(self.get_frame())
  
          if self._legend_title_box:
              children.append(self.get_title())
          return children
  
      def get_frame(self):
          'return the Rectangle instance used to frame the legend'
          return self.legendPatch
  
      def get_lines(self):
          'return a list of lines.Line2D instances in the legend'
          return [h for h in self.legendHandles if isinstance(h, Line2D)]
  
      def get_patches(self):
          'return a list of patch instances in the legend'
          return silent_list('Patch',
                             [h for h in self.legendHandles
                              if isinstance(h, Patch)])
  
      def get_texts(self):
          'return a list of text.Text instance in the legend'
          return silent_list('Text', self.texts)
  
      def set_title(self, title, prop=None):
          """
          set the legend title. Fontproperties can be optionally set
          with *prop* parameter.
          """
          self._legend_title_box._text.set_text(title)
  
          if prop is not None:
              if isinstance(prop, dict):
                  prop = FontProperties(**prop)
              self._legend_title_box._text.set_fontproperties(prop)
  
          if title:
              self._legend_title_box.set_visible(True)
          else:
              self._legend_title_box.set_visible(False)
  
      def get_title(self):
          'return Text instance for the legend title'
          return self._legend_title_box._text
  
      def get_window_extent(self, *args, **kwargs):
          'return a extent of the the legend'
          return self.legendPatch.get_window_extent(*args, **kwargs)
  
      def get_frame_on(self):
          """
          Get whether the legend box patch is drawn
          """
          return self._drawFrame
  
      def set_frame_on(self, b):
          """
          Set whether the legend box patch is drawn
  
          ACCEPTS: [ *True* | *False* ]
          """
          self._drawFrame = b
  
      def get_bbox_to_anchor(self):
          """
          return the bbox that the legend will be anchored
          """
          if self._bbox_to_anchor is None:
              return self.parent.bbox
          else:
              return self._bbox_to_anchor
  
      def set_bbox_to_anchor(self, bbox, transform=None):
          """
          set the bbox that the legend will be anchored.
  
          *bbox* can be a BboxBase instance, a tuple of [left, bottom,
          width, height] in the given transform (normalized axes
          coordinate if None), or a tuple of [left, bottom] where the
          width and height will be assumed to be zero.
          """
          if bbox is None:
              self._bbox_to_anchor = None
              return
          elif isinstance(bbox, BboxBase):
              self._bbox_to_anchor = bbox
          else:
              try:
                  l = len(bbox)
              except TypeError:
                  raise ValueError("Invalid argument for bbox : %s" % str(bbox))
  
              if l == 2:
                  bbox = [bbox[0], bbox[1], 0, 0]
  
              self._bbox_to_anchor = Bbox.from_bounds(*bbox)
  
          if transform is None:
              transform = BboxTransformTo(self.parent.bbox)
  
          self._bbox_to_anchor = TransformedBbox(self._bbox_to_anchor,
                                                 transform)
  
      def _get_anchored_bbox(self, loc, bbox, parentbbox, renderer):
          """
          Place the *bbox* inside the *parentbbox* according to a given
          location code. Return the (x,y) coordinate of the bbox.
  
          - loc: a location code in range(1, 11).
            This corresponds to the possible values for self._loc, excluding
            "best".
  
          - bbox: bbox to be placed, display coodinate units.
          - parentbbox: a parent box which will contain the bbox. In
              display coordinates.
          """
          assert loc in range(1, 11)  # called only internally
  
          BEST, UR, UL, LL, LR, R, CL, CR, LC, UC, C = range(11)
  
          anchor_coefs = {UR: "NE",
                          UL: "NW",
                          LL: "SW",
                          LR: "SE",
                          R: "E",
                          CL: "W",
                          CR: "E",
                          LC: "S",
                          UC: "N",
                          C: "C"}
  
          c = anchor_coefs[loc]
  
          fontsize = renderer.points_to_pixels(self._fontsize)
          container = parentbbox.padded(-(self.borderaxespad) * fontsize)
          anchored_box = bbox.anchored(c, container=container)
          return anchored_box.x0, anchored_box.y0
  
      def _find_best_position(self, width, height, renderer, consider=None):
          """
          Determine the best location to place the legend.
  
          `consider` is a list of (x, y) pairs to consider as a potential
          lower-left corner of the legend. All are display coords.
          """
          # should always hold because function is only called internally
          assert self.isaxes
  
          verts, bboxes, lines = self._auto_legend_data()
  
          bbox = Bbox.from_bounds(0, 0, width, height)
          if consider is None:
              consider = [self._get_anchored_bbox(x, bbox,
                                                  self.get_bbox_to_anchor(),
                                                  renderer)
                          for x in range(1, len(self.codes))]
  
          #tx, ty = self.legendPatch.get_x(), self.legendPatch.get_y()
  
          candidates = []
          for l, b in consider:
              legendBox = Bbox.from_bounds(l, b, width, height)
              badness = 0
              # XXX TODO: If markers are present, it would be good to
              # take their into account when checking vertex overlaps in
              # the next line.
              badness = legendBox.count_contains(verts)
              badness += legendBox.count_overlaps(bboxes)
              for line in lines:
                  # FIXME: the following line is ill-suited for lines
                  # that 'spiral' around the center, because the bbox
                  # may intersect with the legend even if the line
                  # itself doesn't. One solution would be to break up
                  # the line into its straight-segment components, but
                  # this may (or may not) result in a significant
                  # slowdown if lines with many vertices are present.
                  if line.intersects_bbox(legendBox):
                      badness += 1
  
              ox, oy = l, b
              if badness == 0:
                  return ox, oy
  
              candidates.append((badness, (l, b)))
  
          # rather than use min() or list.sort(), do this so that we are assured
          # that in the case of two equal badnesses, the one first considered is
          # returned.
          # NOTE: list.sort() is stable.But leave as it is for now. -JJL
          minCandidate = candidates[0]
          for candidate in candidates:
              if candidate[0] < minCandidate[0]:
                  minCandidate = candidate
  
          ox, oy = minCandidate[1]
  
          return ox, oy
  
      def contains(self, event):
          return self.legendPatch.contains(event)
  
      def draggable(self, state=None, use_blit=False, update="loc"):
          """
          Set the draggable state -- if state is
  
            * None : toggle the current state
  
            * True : turn draggable on
  
            * False : turn draggable off
  
          If draggable is on, you can drag the legend on the canvas with
          the mouse.  The DraggableLegend helper instance is returned if
          draggable is on.
  
          The update parameter control which parameter of the legend changes
          when dragged. If update is "loc", the *loc* paramter of the legend
          is changed. If "bbox", the *bbox_to_anchor* parameter is changed.
          """
          is_draggable = self._draggable is not None
  
          # if state is None we'll toggle
          if state is None:
              state = not is_draggable
  
          if state:
              if self._draggable is None:
                  self._draggable = DraggableLegend(self,
                                                    use_blit,
                                                    update=update)
          else:
              if self._draggable is not None:
                  self._draggable.disconnect()
              self._draggable = None
  
          return self._draggable
  