r"""
Container classes for `.Artist`\s.
`OffsetBox`
The base of all container artists defined in this module.
`AnchoredOffsetbox`, `AnchoredText`
Anchor and align an arbitrary `.Artist` or a text relative to the parent
axes or a specific anchor point.
`DrawingArea`
A container with fixed width and height. Children have a fixed position
inside the container and may be clipped.
`HPacker`, `VPacker`
Containers for layouting their children vertically or horizontally.
`PaddedBox`
A container to add a padding around an `.Artist`.
`TextArea`
Contains a single `.Text` instance.
"""
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.transforms import Bbox, BboxBase, TransformedBbox
DEBUG = False
# for debugging use
[docs]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.
cbook._check_in_list(["fixed", "expand", "equal"], mode=mode)
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
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.
Parameters
----------
hd_list
List of (height, xdescent) of boxes to be aligned.
height : float or None
Intended total length. If None, the maximum of the heights in *hd_list*
is used.
align : {'baseline', 'left', 'top', 'right', 'bottom', 'center'}
Align mode.
"""
if height is None:
height = max(h for h, d in hd_list)
cbook._check_in_list(
["baseline", "left", "top", "right", "bottom", "center"], align=align)
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]
return height, descent, offsets
[docs]class OffsetBox(martist.Artist):
"""
The OffsetBox is a simple container artist.
The child artists are meant to be drawn at a relative position to its
parent.
Being an artist itself, all parameters are passed on to `.Artist`.
"""
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)
@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
[docs] 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, {}
[docs] 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
[docs] 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)
[docs] def set_width(self, width):
"""
Set the width of the box.
Parameters
----------
width : float
"""
self.width = width
self.stale = True
[docs] def set_height(self, height):
"""
Set the height of the box.
Parameters
----------
height : float
"""
self.height = height
self.stale = True
[docs] 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()]
[docs] def get_children(self):
r"""Return a list of the child `.Artist`\s."""
return self._children
[docs] 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.")
[docs] 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
[docs] 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)
[docs] 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
[docs]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* are in points and will be scaled with the renderer
dpi, while *width* and *height* are in 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
[docs]class VPacker(PackerBase):
"""
The VPacker has its children packed vertically. It automatically
adjusts the relative positions of children at 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* are in points and will be scaled with the renderer
dpi, while *width* and *height* are in in pixels.
"""
super().__init__(pad, sep, width, height, align, mode, children)
[docs] 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)))
[docs]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* are in points and will be scaled with the renderer
dpi, while *width* and *height* are in in pixels.
"""
super().__init__(pad, sep, width, height, align, mode, children)
[docs] 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)))
[docs]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 *height* are in *pixels* 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,
visible=draw_frame,
boxstyle="square,pad=0",
)
if patch_attrs is not None:
self.patch.update(patch_attrs)
[docs] 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)])
[docs] def draw(self, renderer):
# docstring inherited
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
[docs] 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
[docs] def draw_frame(self, renderer):
# update the location and size of the legend
self.update_frame(self.get_window_extent(renderer))
self.patch.draw(renderer)
[docs]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):
"""
Parameters
----------
width, height : float
Width and height of the container box.
xdescent, ydescent : float
Descent of the box in x- and y-direction.
clip : bool
Whether to clip the children to the box.
"""
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
[docs] 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
[docs] def get_offset(self):
"""Return offset of the container."""
return self._offset
[docs] def get_window_extent(self, renderer):
"""Return 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)
[docs] def get_extent(self, renderer):
"""Return width, 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)
[docs] def add_artist(self, a):
"""Add an `.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)
[docs] def draw(self, renderer):
# docstring inherited
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
[docs]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
The text to be displayed.
textprops : dict, optional
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
[docs] def set_text(self, s):
"""Set the text of this area as a string."""
self._text.set_text(s)
self.stale = True
[docs] def get_text(self):
"""Return the string representation of this area's text."""
return self._text.get_text()
[docs] 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
[docs] def get_multilinebaseline(self):
"""
Get multilinebaseline.
"""
return self._multilinebaseline
[docs] 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
[docs] def get_minimumdescent(self):
"""
Get minimumdescent.
"""
return self._minimumdescent
[docs] def set_transform(self, t):
"""
set_transform is ignored.
"""
[docs] 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
[docs] def get_offset(self):
"""Return offset of the container."""
return self._offset
[docs] def get_window_extent(self, renderer):
"""Return 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)
[docs] 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
[docs] def draw(self, renderer):
# docstring inherited
self._text.draw(renderer)
bbox_artist(self, renderer, fill=False, props=dict(pad=0.))
self.stale = False
[docs]class AnchoredOffsetbox(OffsetBox):
"""
An offset box placed according to location *loc*.
AnchoredOffsetbox has a single child. When multiple children are needed,
use an extra OffsetBox to enclose them. By default, the offset box is
anchored against its parent axes. You may explicitly specify the
*bbox_to_anchor*.
"""
zorder = 5 # zorder of the legend
# Location codes
codes = {'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,
}
def __init__(self, loc,
pad=0.4, borderpad=0.5,
child=None, prop=None, frameon=True,
bbox_to_anchor=None,
bbox_transform=None,
**kwargs):
"""
Parameters
----------
loc : str
The box location. Supported values:
- 'upper right'
- 'upper left'
- 'lower left'
- 'lower right'
- 'center left'
- 'center right'
- 'lower center'
- 'upper center'
- 'center'
For backward compatibility, numeric values are accepted as well.
See the parameter *loc* of `.Legend` for details.
pad : float, default: 0.4
Padding around the child as fraction of the fontsize.
borderpad : float, default: 0.5
Padding between the offsetbox frame and the *bbox_to_anchor*.
child : `.OffsetBox`
The box that will be anchored.
prop : `.FontProperties`
This is only used as a reference for paddings. If not given,
:rc:`legend.fontsize` is used.
frameon : bool
Whether to draw a frame around the box.
bbox_to_anchor : `.BboxBase`, 2-tuple, or 4-tuple of floats
Box that is used to position the legend in conjunction with *loc*.
bbox_transform : None or :class:`matplotlib.transforms.Transform`
The transform for the bounding box (*bbox_to_anchor*).
**kwargs
All other parameters are passed on to `.OffsetBox`.
Notes
-----
See `.Legend` for a detailed description of the anchoring mechanism.
"""
super().__init__(**kwargs)
self.set_bbox_to_anchor(bbox_to_anchor, bbox_transform)
self.set_child(child)
if isinstance(loc, str):
loc = cbook._check_getitem(self.codes, loc=loc)
self.loc = loc
self.borderpad = borderpad
self.pad = pad
if prop is None:
self.prop = FontProperties(size=rcParams["legend.fontsize"])
else:
self.prop = FontProperties._from_any(prop)
if isinstance(prop, dict) and "size" not in prop:
self.prop.set_size(rcParams["legend.fontsize"])
self.patch = FancyBboxPatch(
xy=(0.0, 0.0), width=1., height=1.,
facecolor='w', edgecolor='k',
mutation_scale=self.prop.get_size_in_points(),
snap=True,
visible=frameon,
boxstyle="square,pad=0",
)
[docs] def set_child(self, child):
"""Set the child to be anchored."""
self._child = child
if child is not None:
child.axes = self.axes
self.stale = True
[docs] def get_child(self):
"""Return the child."""
return self._child
[docs] def get_children(self):
"""Return the list of children."""
return [self._child]
[docs] def get_extent(self, renderer):
"""
Return the extent of the box as (width, height, x, y).
This is the extent of the child plus the padding.
"""
w, h, xd, yd = self.get_child().get_extent(renderer)
fontsize = renderer.points_to_pixels(self.prop.get_size_in_points())
pad = self.pad * fontsize
return w + 2 * pad, h + 2 * pad, xd + pad, yd + pad
[docs] def get_bbox_to_anchor(self):
"""Return the bbox that the box is anchored to."""
if self._bbox_to_anchor is None:
return self.axes.bbox
else:
transform = self._bbox_to_anchor_transform
if transform is None:
return self._bbox_to_anchor
else:
return TransformedBbox(self._bbox_to_anchor,
transform)
[docs] def set_bbox_to_anchor(self, bbox, transform=None):
"""
Set the bbox that the box is anchored to.
*bbox* can be a Bbox instance, a list of [left, bottom, width,
height], or a list of [left, bottom] where the width and
height will be assumed to be zero. The bbox will be
transformed to display coordinate by the given transform.
"""
if bbox is None or isinstance(bbox, BboxBase):
self._bbox_to_anchor = bbox
else:
try:
l = len(bbox)
except TypeError as err:
raise ValueError("Invalid argument for bbox : %s" %
str(bbox)) from err
if l == 2:
bbox = [bbox[0], bbox[1], 0, 0]
self._bbox_to_anchor = Bbox.from_bounds(*bbox)
self._bbox_to_anchor_transform = transform
self.stale = True
[docs] def get_window_extent(self, renderer):
"""Return the bounding box in display space."""
self._update_offset_func(renderer)
w, h, xd, yd = self.get_extent(renderer)
ox, oy = self.get_offset(w, h, xd, yd, renderer)
return Bbox.from_bounds(ox - xd, oy - yd, w, h)
def _update_offset_func(self, renderer, fontsize=None):
"""
Update the offset func which depends on the dpi of the
renderer (because of the padding).
"""
if fontsize is None:
fontsize = renderer.points_to_pixels(
self.prop.get_size_in_points())
def _offset(w, h, xd, yd, renderer, fontsize=fontsize, self=self):
bbox = Bbox.from_bounds(0, 0, w, h)
borderpad = self.borderpad * fontsize
bbox_to_anchor = self.get_bbox_to_anchor()
x0, y0 = self._get_anchored_bbox(self.loc,
bbox,
bbox_to_anchor,
borderpad)
return x0 + xd, y0 + yd
self.set_offset(_offset)
[docs] 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)
[docs] def draw(self, renderer):
# docstring inherited
if not self.get_visible():
return
fontsize = renderer.points_to_pixels(self.prop.get_size_in_points())
self._update_offset_func(renderer, fontsize)
# update the location and size of the legend
bbox = self.get_window_extent(renderer)
self.update_frame(bbox, fontsize)
self.patch.draw(renderer)
width, height, xdescent, ydescent = self.get_extent(renderer)
px, py = self.get_offset(width, height, xdescent, ydescent, renderer)
self.get_child().set_offset((px, py))
self.get_child().draw(renderer)
self.stale = False
def _get_anchored_bbox(self, loc, bbox, parentbbox, borderpad):
"""
Return the position of the bbox anchored at the parentbbox
with the loc code, with the borderpad.
"""
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]
container = parentbbox.padded(-borderpad)
anchored_box = bbox.anchored(c, container=container)
return anchored_box.x0, anchored_box.y0
[docs]class AnchoredText(AnchoredOffsetbox):
"""
AnchoredOffsetbox with Text.
"""
def __init__(self, s, loc, pad=0.4, borderpad=0.5, prop=None, **kwargs):
"""
Parameters
----------
s : str
Text.
loc : str
Location code. See `AnchoredOffsetbox`.
pad : float, default: 0.4
Padding around the text as fraction of the fontsize.
borderpad : float, default: 0.5
Spacing between the offsetbox frame and the *bbox_to_anchor*.
prop : dict, optional
Dictionary of keyword parameters to be passed to the
`~matplotlib.text.Text` instance contained inside AnchoredText.
**kwargs
All other parameters are passed to `AnchoredOffsetbox`.
"""
if prop is None:
prop = {}
badkwargs = {'ha', 'horizontalalignment', 'va', 'verticalalignment'}
if badkwargs & set(prop):
raise ValueError(
"Mixing horizontalalignment or verticalalignment with "
"AnchoredText is not supported.")
self.txt = TextArea(s, textprops=prop, minimumdescent=False)
fp = self.txt._text.get_fontproperties()
super().__init__(
loc, pad=pad, borderpad=borderpad, child=self.txt, prop=fp,
**kwargs)
[docs]class OffsetImage(OffsetBox):
def __init__(self, arr,
zoom=1,
cmap=None,
norm=None,
interpolation=None,
origin=None,
filternorm=True,
filterrad=4.0,
resample=False,
dpi_cor=True,
**kwargs
):
OffsetBox.__init__(self)
self._dpi_cor = dpi_cor
self.image = BboxImage(bbox=self.get_window_extent,
cmap=cmap,
norm=norm,
interpolation=interpolation,
origin=origin,
filternorm=filternorm,
filterrad=filterrad,
resample=resample,
**kwargs
)
self._children = [self.image]
self.set_zoom(zoom)
self.set_data(arr)
[docs] def set_data(self, arr):
self._data = np.asarray(arr)
self.image.set_data(self._data)
self.stale = True
[docs] def get_data(self):
return self._data
[docs] def set_zoom(self, zoom):
self._zoom = zoom
self.stale = True
[docs] def get_zoom(self):
return self._zoom
[docs] def get_offset(self):
"""Return offset of the container."""
return self._offset
[docs] def get_children(self):
return [self.image]
[docs] def get_window_extent(self, renderer):
"""Return the bounding box in display space."""
w, h, xd, yd = self.get_extent(renderer)
ox, oy = self.get_offset()
return mtransforms.Bbox.from_bounds(ox - xd, oy - yd, w, h)
[docs] def get_extent(self, renderer):
if self._dpi_cor: # True, do correction
dpi_cor = renderer.points_to_pixels(1.)
else:
dpi_cor = 1.
zoom = self.get_zoom()
data = self.get_data()
ny, nx = data.shape[:2]
w, h = dpi_cor * nx * zoom, dpi_cor * ny * zoom
return w, h, 0, 0
[docs] def draw(self, renderer):
# docstring inherited
self.image.draw(renderer)
# bbox_artist(self, renderer, fill=False, props=dict(pad=0.))
self.stale = False
[docs]class AnnotationBbox(martist.Artist, mtext._AnnotationBase):
"""
Container for an `OffsetBox` referring to a specific position *xy*.
Optionally an arrow pointing from the offsetbox to *xy* can be drawn.
This is like `.Annotation`, but with `OffsetBox` instead of `.Text`.
"""
zorder = 3
def __str__(self):
return "AnnotationBbox(%g,%g)" % (self.xy[0], self.xy[1])
@docstring.dedent_interpd
def __init__(self, offsetbox, xy,
xybox=None,
xycoords='data',
boxcoords=None,
frameon=True, pad=0.4, # FancyBboxPatch boxstyle.
annotation_clip=None,
box_alignment=(0.5, 0.5),
bboxprops=None,
arrowprops=None,
fontsize=None,
**kwargs):
"""
Parameters
----------
offsetbox : `OffsetBox`
xy : (float, float)
The point *(x, y)* to annotate. The coordinate system is determined
by *xycoords*.
xybox : (float, float), default: *xy*
The position *(x, y)* to place the text at. The coordinate system
is determined by *boxcoords*.
xycoords : str or `.Artist` or `.Transform` or callable or \
(float, float), default: 'data'
The coordinate system that *xy* is given in. See the parameter
*xycoords* in `.Annotation` for a detailed description.
boxcoords : str or `.Artist` or `.Transform` or callable or \
(float, float), default: value of *xycoords*
The coordinate system that *xybox* is given in. See the parameter
*textcoords* in `.Annotation` for a detailed description.
frameon : bool, default: True
Whether to draw a frame around the box.
pad : float, default: 0.4
Padding around the offsetbox.
box_alignment : (float, float)
A tuple of two floats for a vertical and horizontal alignment of
the offset box w.r.t. the *boxcoords*.
The lower-left corner is (0, 0) and upper-right corner is (1, 1).
**kwargs
Other parameters are identical to `.Annotation`.
"""
martist.Artist.__init__(self, **kwargs)
mtext._AnnotationBase.__init__(self,
xy,
xycoords=xycoords,
annotation_clip=annotation_clip)
self.offsetbox = offsetbox
self.arrowprops = arrowprops
self.set_fontsize(fontsize)
if xybox is None:
self.xybox = xy
else:
self.xybox = xybox
if boxcoords is None:
self.boxcoords = xycoords
else:
self.boxcoords = boxcoords
if arrowprops is not None:
self._arrow_relpos = self.arrowprops.pop("relpos", (0.5, 0.5))
self.arrow_patch = FancyArrowPatch((0, 0), (1, 1),
**self.arrowprops)
else:
self._arrow_relpos = None
self.arrow_patch = None
self._box_alignment = box_alignment
# frame
self.patch = FancyBboxPatch(
xy=(0.0, 0.0), width=1., height=1.,
facecolor='w', edgecolor='k',
mutation_scale=self.prop.get_size_in_points(),
snap=True,
visible=frameon,
)
self.patch.set_boxstyle("square", pad=pad)
if bboxprops:
self.patch.set(**bboxprops)
@property
def xyann(self):
return self.xybox
@xyann.setter
def xyann(self, xyann):
self.xybox = xyann
self.stale = True
@property
def anncoords(self):
return self.boxcoords
@anncoords.setter
def anncoords(self, coords):
self.boxcoords = coords
self.stale = True
[docs] def contains(self, mouseevent):
inside, info = self._default_contains(mouseevent)
if inside is not None:
return inside, info
if not self._check_xy(None):
return False, {}
return self.offsetbox.contains(mouseevent)
#if self.arrow_patch is not None:
# a, ainfo=self.arrow_patch.contains(event)
# t = t or a
# self.arrow_patch is currently not checked as this can be a line - JJ
[docs] def get_children(self):
children = [self.offsetbox, self.patch]
if self.arrow_patch:
children.append(self.arrow_patch)
return children
[docs] def set_fontsize(self, s=None):
"""
Set the fontsize in points.
If *s* is not given, reset to :rc:`legend.fontsize`.
"""
if s is None:
s = rcParams["legend.fontsize"]
self.prop = FontProperties(size=s)
self.stale = True
[docs] @cbook._delete_parameter("3.3", "s")
def get_fontsize(self, s=None):
"""Return the fontsize in points."""
return self.prop.get_size_in_points()
[docs] def get_window_extent(self, renderer):
"""
get the bounding box in display space.
"""
bboxes = [child.get_window_extent(renderer)
for child in self.get_children()]
return Bbox.union(bboxes)
[docs] def get_tightbbox(self, renderer):
"""
get tight bounding box in display space.
"""
bboxes = [child.get_tightbbox(renderer)
for child in self.get_children()]
return Bbox.union(bboxes)
[docs] def update_positions(self, renderer):
"""
Update the pixel positions of the annotated point and the text.
"""
xy_pixel = self._get_position_xy(renderer)
self._update_position_xybox(renderer, xy_pixel)
mutation_scale = renderer.points_to_pixels(self.get_fontsize())
self.patch.set_mutation_scale(mutation_scale)
if self.arrow_patch:
self.arrow_patch.set_mutation_scale(mutation_scale)
def _update_position_xybox(self, renderer, xy_pixel):
"""
Update the pixel positions of the annotation text and the arrow patch.
"""
x, y = self.xybox
if isinstance(self.boxcoords, tuple):
xcoord, ycoord = self.boxcoords
x1, y1 = self._get_xy(renderer, x, y, xcoord)
x2, y2 = self._get_xy(renderer, x, y, ycoord)
ox0, oy0 = x1, y2
else:
ox0, oy0 = self._get_xy(renderer, x, y, self.boxcoords)
w, h, xd, yd = self.offsetbox.get_extent(renderer)
_fw, _fh = self._box_alignment
self.offsetbox.set_offset((ox0 - _fw * w + xd, oy0 - _fh * h + yd))
# update patch position
bbox = self.offsetbox.get_window_extent(renderer)
#self.offsetbox.set_offset((ox0-_fw*w, oy0-_fh*h))
self.patch.set_bounds(bbox.x0, bbox.y0,
bbox.width, bbox.height)
x, y = xy_pixel
ox1, oy1 = x, y
if self.arrowprops:
d = self.arrowprops.copy()
# Use FancyArrowPatch if self.arrowprops has "arrowstyle" key.
# adjust the starting point of the arrow relative to
# the textbox.
# TODO : Rotation needs to be accounted.
relpos = self._arrow_relpos
ox0 = bbox.x0 + bbox.width * relpos[0]
oy0 = bbox.y0 + bbox.height * relpos[1]
# The arrow will be drawn from (ox0, oy0) to (ox1,
# oy1). It will be first clipped by patchA and patchB.
# Then it will be shrunk by shrinkA and shrinkB
# (in points). If patch A is not set, self.bbox_patch
# is used.
self.arrow_patch.set_positions((ox0, oy0), (ox1, oy1))
fs = self.prop.get_size_in_points()
mutation_scale = d.pop("mutation_scale", fs)
mutation_scale = renderer.points_to_pixels(mutation_scale)
self.arrow_patch.set_mutation_scale(mutation_scale)
patchA = d.pop("patchA", self.patch)
self.arrow_patch.set_patchA(patchA)
[docs] def draw(self, renderer):
# docstring inherited
if renderer is not None:
self._renderer = renderer
if not self.get_visible() or not self._check_xy(renderer):
return
self.update_positions(renderer)
if self.arrow_patch is not None:
if self.arrow_patch.figure is None and self.figure is not None:
self.arrow_patch.figure = self.figure
self.arrow_patch.draw(renderer)
self.patch.draw(renderer)
self.offsetbox.draw(renderer)
self.stale = False
[docs]class DraggableBase:
"""
Helper base class for a draggable artist (legend, offsetbox).
Derived classes must override the following methods::
def save_offset(self):
'''
Called when the object is picked for dragging; should save the
reference position of the artist.
'''
def update_offset(self, dx, dy):
'''
Called during the dragging; (*dx*, *dy*) is the pixel offset from
the point where the mouse drag started.
'''
Optionally, you may override the following method::
def finalize_offset(self):
'''Called when the mouse is released.'''
In the current implementation of `.DraggableLegend` and
`DraggableAnnotation`, `update_offset` places the artists in display
coordinates, and `finalize_offset` recalculates their position in axes
coordinate and set a relevant attribute.
"""
def __init__(self, ref_artist, use_blit=False):
self.ref_artist = ref_artist
self.got_artist = False
self.canvas = self.ref_artist.figure.canvas
self._use_blit = use_blit and self.canvas.supports_blit
c2 = self.canvas.mpl_connect('pick_event', self.on_pick)
c3 = self.canvas.mpl_connect('button_release_event', self.on_release)
if not ref_artist.pickable():
ref_artist.set_picker(True)
overridden_picker = cbook._deprecate_method_override(
__class__.artist_picker, self, since="3.3",
addendum="Directly set the artist's picker if desired.")
if overridden_picker is not None:
ref_artist.set_picker(overridden_picker)
self.cids = [c2, c3]
[docs] def on_motion(self, evt):
if self._check_still_parented() and self.got_artist:
dx = evt.x - self.mouse_x
dy = evt.y - self.mouse_y
self.update_offset(dx, dy)
if self._use_blit:
self.canvas.restore_region(self.background)
self.ref_artist.draw(self.ref_artist.figure._cachedRenderer)
self.canvas.blit()
else:
self.canvas.draw()
[docs] @cbook.deprecated("3.3", alternative="self.on_motion")
def on_motion_blit(self, evt):
if self._check_still_parented() and self.got_artist:
dx = evt.x - self.mouse_x
dy = evt.y - self.mouse_y
self.update_offset(dx, dy)
self.canvas.restore_region(self.background)
self.ref_artist.draw(self.ref_artist.figure._cachedRenderer)
self.canvas.blit()
[docs] def on_pick(self, evt):
if self._check_still_parented() and evt.artist == self.ref_artist:
self.mouse_x = evt.mouseevent.x
self.mouse_y = evt.mouseevent.y
self.got_artist = True
if self._use_blit:
self.ref_artist.set_animated(True)
self.canvas.draw()
self.background = \
self.canvas.copy_from_bbox(self.ref_artist.figure.bbox)
self.ref_artist.draw(self.ref_artist.figure._cachedRenderer)
self.canvas.blit()
self._c1 = self.canvas.mpl_connect(
"motion_notify_event", self.on_motion)
self.save_offset()
[docs] def on_release(self, event):
if self._check_still_parented() and self.got_artist:
self.finalize_offset()
self.got_artist = False
self.canvas.mpl_disconnect(self._c1)
if self._use_blit:
self.ref_artist.set_animated(False)
def _check_still_parented(self):
if self.ref_artist.figure is None:
self.disconnect()
return False
else:
return True
[docs] def disconnect(self):
"""Disconnect the callbacks."""
for cid in self.cids:
self.canvas.mpl_disconnect(cid)
try:
c1 = self._c1
except AttributeError:
pass
else:
self.canvas.mpl_disconnect(c1)
[docs] @cbook.deprecated("3.3", alternative="self.ref_artist.contains")
def artist_picker(self, artist, evt):
return self.ref_artist.contains(evt)
[docs] def save_offset(self):
pass
[docs] def update_offset(self, dx, dy):
pass
[docs] def finalize_offset(self):
pass
[docs]class DraggableOffsetBox(DraggableBase):
def __init__(self, ref_artist, offsetbox, use_blit=False):
DraggableBase.__init__(self, ref_artist, use_blit=use_blit)
self.offsetbox = offsetbox
[docs] def save_offset(self):
offsetbox = self.offsetbox
renderer = offsetbox.figure._cachedRenderer
w, h, xd, yd = offsetbox.get_extent(renderer)
offset = offsetbox.get_offset(w, h, xd, yd, renderer)
self.offsetbox_x, self.offsetbox_y = offset
self.offsetbox.set_offset(offset)
[docs] def update_offset(self, dx, dy):
loc_in_canvas = self.offsetbox_x + dx, self.offsetbox_y + dy
self.offsetbox.set_offset(loc_in_canvas)
[docs] def get_loc_in_canvas(self):
offsetbox = self.offsetbox
renderer = offsetbox.figure._cachedRenderer
w, h, xd, yd = offsetbox.get_extent(renderer)
ox, oy = offsetbox._offset
loc_in_canvas = (ox - xd, oy - yd)
return loc_in_canvas
[docs]class DraggableAnnotation(DraggableBase):
def __init__(self, annotation, use_blit=False):
DraggableBase.__init__(self, annotation, use_blit=use_blit)
self.annotation = annotation
[docs] def save_offset(self):
ann = self.annotation
self.ox, self.oy = ann.get_transform().transform(ann.xyann)
[docs] def update_offset(self, dx, dy):
ann = self.annotation
ann.xyann = ann.get_transform().inverted().transform(
(self.ox + dx, self.oy + dy))
