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offsetbox.py
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1829 lines (1468 loc) · 57.4 KB
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"""
The `.OffsetBox` is a simple container artist. Its child artists are
meant to be drawn at a relative position to OffsetBox. The [VH]Packer,
DrawingArea and TextArea are derived from the OffsetBox.
The [VH]Packer automatically adjust the relative positions of their
children, which should be instances of the OffsetBox. This is used to
align similar artists together, e.g., in legend.
The DrawingArea can contain any Artist as a child. The
DrawingArea has a fixed width and height. The position of children
relative to the parent is fixed. The TextArea is contains a single
Text instance. The width and height of the TextArea instance is the
width and height of the its child text.
"""
import numpy as np
from matplotlib import cbook, docstring, rcParams
import matplotlib.artist as martist
import matplotlib.path as mpath
import matplotlib.text as mtext
import matplotlib.transforms as mtransforms
from matplotlib.font_manager import FontProperties
from matplotlib.image import BboxImage
from matplotlib.patches import (
FancyBboxPatch, FancyArrowPatch, bbox_artist as mbbox_artist)
from matplotlib.text import _AnnotationBase
from matplotlib.transforms import Bbox, BboxBase, TransformedBbox
DEBUG = False
# for debugging use
def bbox_artist(*args, **kwargs):
if DEBUG:
mbbox_artist(*args, **kwargs)
# _get_packed_offsets() and _get_aligned_offsets() are coded assuming
# that we are packing boxes horizontally. But same function will be
# used with vertical packing.
def _get_packed_offsets(wd_list, total, sep, mode="fixed"):
"""
Given a list of (width, xdescent) of each boxes, calculate the
total width and the x-offset positions of each items according to
*mode*. xdescent is analogous to the usual descent, but along the
x-direction. xdescent values are currently ignored.
For simplicity of the description, the terminology used here assumes a
horizontal layout, but the function works equally for a vertical layout.
There are three packing modes:
- 'fixed': The elements are packed tight to the left with a spacing of
*sep* in between. If *total* is *None* the returned total will be the
right edge of the last box. A non-*None* total will be passed unchecked
to the output. In particular this means that right edge of the last
box may be further to the right than the returned total.
- 'expand': Distribute the boxes with equal spacing so that the left edge
of the first box is at 0, and the right edge of the last box is at
*total*. The parameter *sep* is ignored in this mode. A total of *None*
is accepted and considered equal to 1. The total is returned unchanged
(except for the conversion *None* to 1). If the total is smaller than
the sum of the widths, the laid out boxes will overlap.
- 'equal': If *total* is given, the total space is divided in N equal
ranges and each box is left-aligned within its subspace.
Otherwise (*total* is *None*), *sep* must be provided and each box is
left-aligned in its subspace of width ``(max(widths) + sep)``. The
total width is then calculated to be ``N * (max(widths) + sep)``.
Parameters
----------
wd_list : list of (float, float)
(width, xdescent) of boxes to be packed.
total : float or None
Intended total length. *None* if not used.
sep : float
Spacing between boxes.
mode : {'fixed', 'expand', 'equal'}
The packing mode.
Returns
-------
total : float
The total width needed to accommodate the laid out boxes.
offsets : array of float
The left offsets of the boxes.
"""
w_list, d_list = zip(*wd_list)
# d_list is currently not used.
if mode == "fixed":
offsets_ = np.cumsum([0] + [w + sep for w in w_list])
offsets = offsets_[:-1]
if total is None:
total = offsets_[-1] - sep
return total, offsets
elif mode == "expand":
# This is a bit of a hack to avoid a TypeError when *total*
# is None and used in conjugation with tight layout.
if total is None:
total = 1
if len(w_list) > 1:
sep = (total - sum(w_list)) / (len(w_list) - 1)
else:
sep = 0
offsets_ = np.cumsum([0] + [w + sep for w in w_list])
offsets = offsets_[:-1]
return total, offsets
elif mode == "equal":
maxh = max(w_list)
if total is None:
if sep is None:
raise ValueError("total and sep cannot both be None when "
"using layout mode 'equal'.")
total = (maxh + sep) * len(w_list)
else:
sep = total / len(w_list) - maxh
offsets = (maxh + sep) * np.arange(len(w_list))
return total, offsets
else:
raise ValueError("Unknown mode : %s" % (mode,))
def _get_aligned_offsets(hd_list, height, align="baseline"):
"""
Given a list of (height, descent) of each boxes, align the boxes
with *align* and calculate the y-offsets of each boxes.
total width and the offset positions of each items according to
*mode*. xdescent is analogous to the usual descent, but along the
x-direction. xdescent values are currently ignored.
*hd_list* : list of (width, xdescent) of boxes to be aligned.
*sep* : spacing between boxes
*height* : Intended total length. None if not used.
*align* : align mode. 'baseline', 'top', 'bottom', or 'center'.
"""
if height is None:
height = max(h for h, d in hd_list)
if align == "baseline":
height_descent = max(h - d for h, d in hd_list)
descent = max(d for h, d in hd_list)
height = height_descent + descent
offsets = [0. for h, d in hd_list]
elif align in ["left", "top"]:
descent = 0.
offsets = [d for h, d in hd_list]
elif align in ["right", "bottom"]:
descent = 0.
offsets = [height - h + d for h, d in hd_list]
elif align == "center":
descent = 0.
offsets = [(height - h) * .5 + d for h, d in hd_list]
else:
raise ValueError("Unknown Align mode : %s" % (align,))
return height, descent, offsets
class OffsetBox(martist.Artist):
"""
The OffsetBox is a simple container artist. The child artist are meant
to be drawn at a relative position to its parent.
"""
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
# Clipping has not been implemented in the OffesetBox family, so
# disable the clip flag for consistency. It can always be turned back
# on to zero effect.
self.set_clip_on(False)
self._children = []
self._offset = (0, 0)
def set_figure(self, fig):
"""
Set the `.Figure` for the `.OffsetBox` and all its children.
Parameters
----------
fig : `~matplotlib.figure.Figure`
"""
martist.Artist.set_figure(self, fig)
for c in self.get_children():
c.set_figure(fig)
@martist.Artist.axes.setter
def axes(self, ax):
# TODO deal with this better
martist.Artist.axes.fset(self, ax)
for c in self.get_children():
if c is not None:
c.axes = ax
def contains(self, mouseevent):
"""
Delegate the mouse event contains-check to the children.
As a container, the `.OffsetBox` does not respond itself to
mouseevents.
Parameters
----------
mouseevent : `matplotlib.backend_bases.MouseEvent`
Returns
-------
contains : bool
Whether any values are within the radius.
details : dict
An artist-specific dictionary of details of the event context,
such as which points are contained in the pick radius. See the
individual Artist subclasses for details.
See Also
--------
.Artist.contains
"""
inside, info = self._default_contains(mouseevent)
if inside is not None:
return inside, info
for c in self.get_children():
a, b = c.contains(mouseevent)
if a:
return a, b
return False, {}
def set_offset(self, xy):
"""
Set the offset.
Parameters
----------
xy : (float, float) or callable
The (x, y) coordinates of the offset in display units. These can
either be given explicitly as a tuple (x, y), or by providing a
function that converts the extent into the offset. This function
must have the signature::
def offset(width, height, xdescent, ydescent, renderer) \
-> (float, float)
"""
self._offset = xy
self.stale = True
def get_offset(self, width, height, xdescent, ydescent, renderer):
"""
Return the offset as a tuple (x, y).
The extent parameters have to be provided to handle the case where the
offset is dynamically determined by a callable (see
`~.OffsetBox.set_offset`).
Parameters
----------
width, height, xdescent, ydescent
Extent parameters.
renderer : `.RendererBase` subclass
"""
return (self._offset(width, height, xdescent, ydescent, renderer)
if callable(self._offset)
else self._offset)
def set_width(self, width):
"""
Set the width of the box.
Parameters
----------
width : float
"""
self.width = width
self.stale = True
def set_height(self, height):
"""
Set the height of the box.
Parameters
----------
height : float
"""
self.height = height
self.stale = True
def get_visible_children(self):
r"""Return a list of the visible child `.Artist`\s."""
return [c for c in self._children if c.get_visible()]
def get_children(self):
r"""Return a list of the child `.Artist`\s."""
return self._children
def get_extent_offsets(self, renderer):
"""
Update offset of the children and return the extent of the box.
Parameters
----------
renderer : `.RendererBase` subclass
Returns
-------
width
height
xdescent
ydescent
list of (xoffset, yoffset) pairs
"""
raise NotImplementedError(
"get_extent_offsets must be overridden in derived classes.")
def get_extent(self, renderer):
"""Return a tuple ``width, height, xdescent, ydescent`` of the box."""
w, h, xd, yd, offsets = self.get_extent_offsets(renderer)
return w, h, xd, yd
def get_window_extent(self, renderer):
"""Return the bounding box (`.Bbox`) in display space."""
w, h, xd, yd, offsets = self.get_extent_offsets(renderer)
px, py = self.get_offset(w, h, xd, yd, renderer)
return mtransforms.Bbox.from_bounds(px - xd, py - yd, w, h)
def draw(self, renderer):
"""
Update the location of children if necessary and draw them
to the given *renderer*.
"""
width, height, xdescent, ydescent, offsets = self.get_extent_offsets(
renderer)
px, py = self.get_offset(width, height, xdescent, ydescent, renderer)
for c, (ox, oy) in zip(self.get_visible_children(), offsets):
c.set_offset((px + ox, py + oy))
c.draw(renderer)
bbox_artist(self, renderer, fill=False, props=dict(pad=0.))
self.stale = False
class PackerBase(OffsetBox):
def __init__(self, pad=None, sep=None, width=None, height=None,
align=None, mode=None,
children=None):
"""
Parameters
----------
pad : float, optional
The boundary padding in points.
sep : float, optional
The spacing between items in points.
width, height : float, optional
Width and height of the container box in pixels, calculated if
*None*.
align : {'top', 'bottom', 'left', 'right', 'center', 'baseline'}
Alignment of boxes.
mode : {'fixed', 'expand', 'equal'}
The packing mode.
- 'fixed' packs the given `.Artists` tight with *sep* spacing.
- 'expand' uses the maximal available space to distribute the
artists with equal spacing in between.
- 'equal': Each artist an equal fraction of the available space
and is left-aligned (or top-aligned) therein.
children : list of `.Artist`
The artists to pack.
Notes
-----
*pad* and *sep* need to given in points and will be scale with
the renderer dpi, while *width* and *height* need to be in
pixels.
"""
super().__init__()
self.height = height
self.width = width
self.sep = sep
self.pad = pad
self.mode = mode
self.align = align
self._children = children
class VPacker(PackerBase):
"""
The VPacker has its children packed vertically. It automatically
adjust the relative positions of children in the drawing time.
"""
def __init__(self, pad=None, sep=None, width=None, height=None,
align="baseline", mode="fixed",
children=None):
"""
Parameters
----------
pad : float, optional
The boundary padding in points.
sep : float, optional
The spacing between items in points.
width, height : float, optional
Width and height of the container box in pixels, calculated if
*None*.
align : {'top', 'bottom', 'left', 'right', 'center', 'baseline'}
Alignment of boxes.
mode : {'fixed', 'expand', 'equal'}
The packing mode.
- 'fixed' packs the given `.Artists` tight with *sep* spacing.
- 'expand' uses the maximal available space to distribute the
artists with equal spacing in between.
- 'equal': Each artist an equal fraction of the available space
and is left-aligned (or top-aligned) therein.
children : list of `.Artist`
The artists to pack.
Notes
-----
*pad* and *sep* need to given in points and will be scale with
the renderer dpi, while *width* and *height* need to be in
pixels.
"""
super().__init__(pad, sep, width, height, align, mode, children)
def get_extent_offsets(self, renderer):
# docstring inherited
dpicor = renderer.points_to_pixels(1.)
pad = self.pad * dpicor
sep = self.sep * dpicor
if self.width is not None:
for c in self.get_visible_children():
if isinstance(c, PackerBase) and c.mode == "expand":
c.set_width(self.width)
whd_list = [c.get_extent(renderer)
for c in self.get_visible_children()]
whd_list = [(w, h, xd, (h - yd)) for w, h, xd, yd in whd_list]
wd_list = [(w, xd) for w, h, xd, yd in whd_list]
width, xdescent, xoffsets = _get_aligned_offsets(wd_list,
self.width,
self.align)
pack_list = [(h, yd) for w, h, xd, yd in whd_list]
height, yoffsets_ = _get_packed_offsets(pack_list, self.height,
sep, self.mode)
yoffsets = yoffsets_ + [yd for w, h, xd, yd in whd_list]
ydescent = height - yoffsets[0]
yoffsets = height - yoffsets
yoffsets = yoffsets - ydescent
return (width + 2 * pad, height + 2 * pad,
xdescent + pad, ydescent + pad,
list(zip(xoffsets, yoffsets)))
class HPacker(PackerBase):
"""
The HPacker has its children packed horizontally. It automatically
adjusts the relative positions of children at draw time.
"""
def __init__(self, pad=None, sep=None, width=None, height=None,
align="baseline", mode="fixed",
children=None):
"""
Parameters
----------
pad : float, optional
The boundary padding in points.
sep : float, optional
The spacing between items in points.
width, height : float, optional
Width and height of the container box in pixels, calculated if
*None*.
align : {'top', 'bottom', 'left', 'right', 'center', 'baseline'}
Alignment of boxes.
mode : {'fixed', 'expand', 'equal'}
The packing mode.
- 'fixed' packs the given `.Artists` tight with *sep* spacing.
- 'expand' uses the maximal available space to distribute the
artists with equal spacing in between.
- 'equal': Each artist an equal fraction of the available space
and is left-aligned (or top-aligned) therein.
children : list of `.Artist`
The artists to pack.
Notes
-----
*pad* and *sep* need to given in points and will be scale with
the renderer dpi, while *width* and *height* need to be in
pixels.
"""
super().__init__(pad, sep, width, height, align, mode, children)
def get_extent_offsets(self, renderer):
# docstring inherited
dpicor = renderer.points_to_pixels(1.)
pad = self.pad * dpicor
sep = self.sep * dpicor
whd_list = [c.get_extent(renderer)
for c in self.get_visible_children()]
if not whd_list:
return 2 * pad, 2 * pad, pad, pad, []
if self.height is None:
height_descent = max(h - yd for w, h, xd, yd in whd_list)
ydescent = max(yd for w, h, xd, yd in whd_list)
height = height_descent + ydescent
else:
height = self.height - 2 * pad # width w/o pad
hd_list = [(h, yd) for w, h, xd, yd in whd_list]
height, ydescent, yoffsets = _get_aligned_offsets(hd_list,
self.height,
self.align)
pack_list = [(w, xd) for w, h, xd, yd in whd_list]
width, xoffsets_ = _get_packed_offsets(pack_list, self.width,
sep, self.mode)
xoffsets = xoffsets_ + [xd for w, h, xd, yd in whd_list]
xdescent = whd_list[0][2]
xoffsets = xoffsets - xdescent
return (width + 2 * pad, height + 2 * pad,
xdescent + pad, ydescent + pad,
list(zip(xoffsets, yoffsets)))
class PaddedBox(OffsetBox):
"""
A container to add a padding around an `.Artist`.
The `.PaddedBox` contains a `.FancyBboxPatch` that is used to visualize
it when rendering.
"""
def __init__(self, child, pad=None, draw_frame=False, patch_attrs=None):
"""
Parameters
----------
child : `~matplotlib.artist.Artist`
The contained `.Artist`.
pad : float
The padding in points. This will be scaled with the renderer dpi.
In contrast *width* and *hight* are in *pixel* and thus not scaled.
draw_frame : bool
Whether to draw the contained `.FancyBboxPatch`.
patch_attrs : dict or None
Additional parameters passed to the contained `.FancyBboxPatch`.
"""
super().__init__()
self.pad = pad
self._children = [child]
self.patch = FancyBboxPatch(
xy=(0.0, 0.0), width=1., height=1.,
facecolor='w', edgecolor='k',
mutation_scale=1, # self.prop.get_size_in_points(),
snap=True
)
self.patch.set_boxstyle("square", pad=0)
if patch_attrs is not None:
self.patch.update(patch_attrs)
self._drawFrame = draw_frame
def get_extent_offsets(self, renderer):
# docstring inherited.
dpicor = renderer.points_to_pixels(1.)
pad = self.pad * dpicor
w, h, xd, yd = self._children[0].get_extent(renderer)
return (w + 2 * pad, h + 2 * pad, xd + pad, yd + pad,
[(0, 0)])
def draw(self, renderer):
"""
Update the location of children if necessary and draw them
to the given *renderer*.
"""
width, height, xdescent, ydescent, offsets = self.get_extent_offsets(
renderer)
px, py = self.get_offset(width, height, xdescent, ydescent, renderer)
for c, (ox, oy) in zip(self.get_visible_children(), offsets):
c.set_offset((px + ox, py + oy))
self.draw_frame(renderer)
for c in self.get_visible_children():
c.draw(renderer)
#bbox_artist(self, renderer, fill=False, props=dict(pad=0.))
self.stale = False
def update_frame(self, bbox, fontsize=None):
self.patch.set_bounds(bbox.x0, bbox.y0,
bbox.width, bbox.height)
if fontsize:
self.patch.set_mutation_scale(fontsize)
self.stale = True
def draw_frame(self, renderer):
# update the location and size of the legend
bbox = self.get_window_extent(renderer)
self.update_frame(bbox)
if self._drawFrame:
self.patch.draw(renderer)
class DrawingArea(OffsetBox):
"""
The DrawingArea can contain any Artist as a child. The DrawingArea
has a fixed width and height. The position of children relative to
the parent is fixed. The children can be clipped at the
boundaries of the parent.
"""
def __init__(self, width, height, xdescent=0.,
ydescent=0., clip=False):
"""
*width*, *height* : width and height of the container box.
*xdescent*, *ydescent* : descent of the box in x- and y-direction.
*clip* : Whether to clip the children
"""
super().__init__()
self.width = width
self.height = height
self.xdescent = xdescent
self.ydescent = ydescent
self._clip_children = clip
self.offset_transform = mtransforms.Affine2D()
self.dpi_transform = mtransforms.Affine2D()
@property
def clip_children(self):
"""
If the children of this DrawingArea should be clipped
by DrawingArea bounding box.
"""
return self._clip_children
@clip_children.setter
def clip_children(self, val):
self._clip_children = bool(val)
self.stale = True
def get_transform(self):
"""
Return the `~matplotlib.transforms.Transform` applied to the children.
"""
return self.dpi_transform + self.offset_transform
def set_transform(self, t):
"""
set_transform is ignored.
"""
def set_offset(self, xy):
"""
Set the offset of the container.
Parameters
----------
xy : (float, float)
The (x, y) coordinates of the offset in display units.
"""
self._offset = xy
self.offset_transform.clear()
self.offset_transform.translate(xy[0], xy[1])
self.stale = True
def get_offset(self):
"""
return offset of the container.
"""
return self._offset
def get_window_extent(self, renderer):
'''
get the bounding box in display space.
'''
w, h, xd, yd = self.get_extent(renderer)
ox, oy = self.get_offset() # w, h, xd, yd)
return mtransforms.Bbox.from_bounds(ox - xd, oy - yd, w, h)
def get_extent(self, renderer):
"""
Return with, height, xdescent, ydescent of box
"""
dpi_cor = renderer.points_to_pixels(1.)
return (self.width * dpi_cor, self.height * dpi_cor,
self.xdescent * dpi_cor, self.ydescent * dpi_cor)
def add_artist(self, a):
'Add any :class:`~matplotlib.artist.Artist` to the container box'
self._children.append(a)
if not a.is_transform_set():
a.set_transform(self.get_transform())
if self.axes is not None:
a.axes = self.axes
fig = self.figure
if fig is not None:
a.set_figure(fig)
def draw(self, renderer):
"""
Draw the children
"""
dpi_cor = renderer.points_to_pixels(1.)
self.dpi_transform.clear()
self.dpi_transform.scale(dpi_cor)
# At this point the DrawingArea has a transform
# to the display space so the path created is
# good for clipping children
tpath = mtransforms.TransformedPath(
mpath.Path([[0, 0], [0, self.height],
[self.width, self.height],
[self.width, 0]]),
self.get_transform())
for c in self._children:
if self._clip_children and not (c.clipbox or c._clippath):
c.set_clip_path(tpath)
c.draw(renderer)
bbox_artist(self, renderer, fill=False, props=dict(pad=0.))
self.stale = False
class TextArea(OffsetBox):
"""
The TextArea is contains a single Text instance. The text is
placed at (0, 0) with baseline+left alignment. The width and height
of the TextArea instance is the width and height of the its child
text.
"""
def __init__(self, s,
textprops=None,
multilinebaseline=None,
minimumdescent=True,
):
"""
Parameters
----------
s : str
a string to be displayed.
textprops : dictionary, optional, default: None
Dictionary of keyword parameters to be passed to the
`~matplotlib.text.Text` instance contained inside TextArea.
multilinebaseline : bool, optional
If `True`, baseline for multiline text is adjusted so that it is
(approximately) center-aligned with singleline text.
minimumdescent : bool, optional
If `True`, the box has a minimum descent of "p".
"""
if textprops is None:
textprops = {}
textprops.setdefault("va", "baseline")
self._text = mtext.Text(0, 0, s, **textprops)
OffsetBox.__init__(self)
self._children = [self._text]
self.offset_transform = mtransforms.Affine2D()
self._baseline_transform = mtransforms.Affine2D()
self._text.set_transform(self.offset_transform +
self._baseline_transform)
self._multilinebaseline = multilinebaseline
self._minimumdescent = minimumdescent
def set_text(self, s):
"Set the text of this area as a string."
self._text.set_text(s)
self.stale = True
def get_text(self):
"Returns the string representation of this area's text"
return self._text.get_text()
def set_multilinebaseline(self, t):
"""
Set multilinebaseline .
If True, baseline for multiline text is adjusted so that it is
(approximately) center-aligned with single-line text.
"""
self._multilinebaseline = t
self.stale = True
def get_multilinebaseline(self):
"""
get multilinebaseline .
"""
return self._multilinebaseline
def set_minimumdescent(self, t):
"""
Set minimumdescent .
If True, extent of the single line text is adjusted so that
it has minimum descent of "p"
"""
self._minimumdescent = t
self.stale = True
def get_minimumdescent(self):
"""
get minimumdescent.
"""
return self._minimumdescent
def set_transform(self, t):
"""
set_transform is ignored.
"""
def set_offset(self, xy):
"""
Set the offset of the container.
Parameters
----------
xy : (float, float)
The (x, y) coordinates of the offset in display units.
"""
self._offset = xy
self.offset_transform.clear()
self.offset_transform.translate(xy[0], xy[1])
self.stale = True
def get_offset(self):
"""
return offset of the container.
"""
return self._offset
def get_window_extent(self, renderer):
'''
get the bounding box in display space.
'''
w, h, xd, yd = self.get_extent(renderer)
ox, oy = self.get_offset() # w, h, xd, yd)
return mtransforms.Bbox.from_bounds(ox - xd, oy - yd, w, h)
def get_extent(self, renderer):
_, h_, d_ = renderer.get_text_width_height_descent(
"lp", self._text._fontproperties, ismath=False)
bbox, info, d = self._text._get_layout(renderer)
w, h = bbox.width, bbox.height
self._baseline_transform.clear()
if len(info) > 1 and self._multilinebaseline:
d_new = 0.5 * h - 0.5 * (h_ - d_)
self._baseline_transform.translate(0, d - d_new)
d = d_new
else: # single line
h_d = max(h_ - d_, h - d)
if self.get_minimumdescent():
## to have a minimum descent, #i.e., "l" and "p" have same
## descents.
d = max(d, d_)
#else:
# d = d
h = h_d + d
return w, h, 0., d
def draw(self, renderer):
"""
Draw the children
"""
self._text.draw(renderer)
bbox_artist(self, renderer, fill=False, props=dict(pad=0.))
self.stale = False
class AuxTransformBox(OffsetBox):
"""
Offset Box with the aux_transform. Its children will be
transformed with the aux_transform first then will be
offseted. The absolute coordinate of the aux_transform is meaning
as it will be automatically adjust so that the left-lower corner
of the bounding box of children will be set to (0, 0) before the
offset transform.
It is similar to drawing area, except that the extent of the box
is not predetermined but calculated from the window extent of its
children. Furthermore, the extent of the children will be
calculated in the transformed coordinate.
"""
def __init__(self, aux_transform):
self.aux_transform = aux_transform
OffsetBox.__init__(self)
self.offset_transform = mtransforms.Affine2D()
# ref_offset_transform makes offset_transform always relative to the
# lower-left corner of the bbox of its children.
self.ref_offset_transform = mtransforms.Affine2D()
def add_artist(self, a):
'Add any :class:`~matplotlib.artist.Artist` to the container box'
self._children.append(a)
a.set_transform(self.get_transform())
self.stale = True
def get_transform(self):
"""
Return the :class:`~matplotlib.transforms.Transform` applied
to the children
"""
return (self.aux_transform
+ self.ref_offset_transform
+ self.offset_transform)
def set_transform(self, t):
"""
set_transform is ignored.
"""
def set_offset(self, xy):
"""
Set the offset of the container.
Parameters
----------
xy : (float, float)
The (x, y) coordinates of the offset in display units.
"""
self._offset = xy
self.offset_transform.clear()
self.offset_transform.translate(xy[0], xy[1])
self.stale = True
def get_offset(self):
"""
return offset of the container.
"""
return self._offset
def get_window_extent(self, renderer):
'''
get the bounding box in display space.
'''
w, h, xd, yd = self.get_extent(renderer)
ox, oy = self.get_offset() # w, h, xd, yd)
return mtransforms.Bbox.from_bounds(ox - xd, oy - yd, w, h)