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offsetbox.py
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1814 lines (1416 loc) · 54.2 KB
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"""
The OffsetBox is a simple container artist. The child artist are meant
to be drawn at a relative position to its parent. The [VH]Packer,
DrawingArea and TextArea are derived from the OffsetBox.
The [VH]Packer automatically adjust the relative postisions 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.
"""
from __future__ import (absolute_import, division, print_function,
unicode_literals)
import six
from six.moves import xrange, zip
import warnings
import matplotlib.transforms as mtransforms
import matplotlib.artist as martist
import matplotlib.text as mtext
import matplotlib.path as mpath
import numpy as np
from matplotlib.transforms import Bbox, BboxBase, TransformedBbox
from matplotlib.font_manager import FontProperties
from matplotlib.patches import FancyBboxPatch, FancyArrowPatch
from matplotlib import rcParams
from matplotlib import docstring
#from bboximage import BboxImage
from matplotlib.image import BboxImage
from matplotlib.patches import bbox_artist as mbbox_artist
from matplotlib.text import _AnnotationBase
DEBUG = False
# for debuging 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"):
"""
Geiven 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 analagous to the usual descent, but along the
x-direction. xdescent values are currently ignored.
*wd_list* : list of (width, xdescent) of boxes to be packed.
*sep* : spacing between boxes
*total* : Intended total length. None if not used.
*mode* : packing mode. 'fixed', 'expand', or 'equal'.
"""
w_list, d_list = zip(*wd_list)
# d_list is currently not used.
if mode == "fixed":
offsets_ = np.add.accumulate([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":
if len(w_list) > 1:
sep = (total - sum(w_list)) / (len(w_list) - 1.)
else:
sep = 0.
offsets_ = np.add.accumulate([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:
total = (maxh + sep) * len(w_list)
else:
sep = float(total) / (len(w_list)) - maxh
offsets = np.array([(maxh + sep) * i for i in range(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(OffsetBox, self).__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 __getstate__(self):
state = martist.Artist.__getstate__(self)
# pickle cannot save instancemethods, so handle them here
from .cbook import _InstanceMethodPickler
import inspect
offset = state['_offset']
if inspect.ismethod(offset):
state['_offset'] = _InstanceMethodPickler(offset)
return state
def __setstate__(self, state):
self.__dict__ = state
from .cbook import _InstanceMethodPickler
if isinstance(self._offset, _InstanceMethodPickler):
self._offset = self._offset.get_instancemethod()
self.stale = True
def set_figure(self, fig):
"""
Set the figure
accepts a class:`~matplotlib.figure.Figure` instance
"""
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):
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
accepts x, y, tuple, or a callable object.
"""
self._offset = xy
self.stale = True
def get_offset(self, width, height, xdescent, ydescent, renderer):
"""
Get the offset
accepts extent of the box
"""
return (self._offset(width, height, xdescent, ydescent, renderer)
if callable(self._offset)
else self._offset)
def set_width(self, width):
"""
Set the width
accepts float
"""
self.width = width
self.stale = True
def set_height(self, height):
"""
Set the height
accepts float
"""
self.height = height
self.stale = True
def get_visible_children(self):
"""
Return a list of visible artists it contains.
"""
return [c for c in self._children if c.get_visible()]
def get_children(self):
"""
Return a list of artists it contains.
"""
return self._children
def get_extent_offsets(self, renderer):
raise Exception("")
def get_extent(self, renderer):
"""
Return with, height, xdescent, ydescent of box
"""
w, h, xd, yd, offsets = self.get_extent_offsets(renderer)
return w, h, xd, yd
def get_window_extent(self, renderer):
'''
get the bounding box 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
Boundary pad.
sep : float, optional
Spacing between items.
width : float, optional
height : float, optional
Width and height of the container box, calculated if
`None`.
align : str, optional
Alignment of boxes. Can be one of ``top``, ``bottom``,
``left``, ``right``, ``center`` and ``baseline``
mode : str, optional
Packing mode.
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(PackerBase, self).__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
Boundary pad.
sep : float, optional
Spacing between items.
width : float, optional
height : float, optional
width and height of the container box, calculated if
`None`.
align : str, optional
Alignment of boxes.
mode : str, optional
Packing mode.
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(VPacker, self).__init__(pad, sep, width, height,
align, mode,
children)
def get_extent_offsets(self, renderer):
"""
update offset of childrens and return the extents of the box
"""
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
#w, h, xd, h_yd = whd_list[-1]
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
Boundary pad.
sep : float, optional
Spacing between items.
width : float, optional
height : float, optional
Width and height of the container box, calculated if
`None`.
align : str
Alignment of boxes.
mode : str
Packing mode.
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(HPacker, self).__init__(pad, sep, width, height,
align, mode, children)
def get_extent_offsets(self, renderer):
"""
update offset of children and return the extents of the box
"""
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):
def __init__(self, child, pad=None, draw_frame=False, patch_attrs=None):
"""
*pad* : boundary pad
.. note::
*pad* need to given in points and will be
scale with the renderer dpi, while *width* and *height*
need to be in pixels.
"""
super(PaddedBox, self).__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):
"""
update offset of childrens and return the extents of the box
"""
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(DrawingArea, self).__init__()
self.width = width
self.height = height
self.xdescent = xdescent
self.ydescent = ydescent
self._clip_children = clip
self.offset_transform = mtransforms.Affine2D()
self.offset_transform.clear()
self.offset_transform.translate(0, 0)
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 :class:`~matplotlib.transforms.Transform` applied
to the children
"""
return self.dpi_transform + self.offset_transform
def set_transform(self, t):
"""
set_transform is ignored.
"""
pass
def set_offset(self, xy):
"""
set offset of the container.
Accept : tuple of x,y cooridnate in disokay 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, 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 : `~matplotlib.font_manager.FontProperties`, optional
multilinebaseline : bool, optional
If `True`, baseline for multiline text is adjusted so that
it is (approximatedly) center-aligned with singleline
text.
minimumdescent : bool, optional
If `True`, the box has a minimum descent of "p".
"""
if textprops is None:
textprops = {}
if "va" not in textprops:
textprops["va"] = "baseline"
self._text = mtext.Text(0, 0, s, **textprops)
OffsetBox.__init__(self)
self._children = [self._text]
self.offset_transform = mtransforms.Affine2D()
self.offset_transform.clear()
self.offset_transform.translate(0, 0)
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 (approximatedly) center-aligned with
singleline 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.
"""
pass
def set_offset(self, xy):
"""
set offset of the container.
Accept : tuple of x,y coordinates 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):
clean_line, ismath = self._text.is_math_text(self._text._text)
_, 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
line = info[-1][0] # last line
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()
self.offset_transform.clear()
self.offset_transform.translate(0, 0)
# ref_offset_transform is used to make the offset_transform is
# always reference to the lower-left corner of the bbox of its
# children.
self.ref_offset_transform = mtransforms.Affine2D()
self.ref_offset_transform.clear()
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.
"""
pass
def set_offset(self, xy):
"""
set offset of the container.
Accept : tuple of x,y coordinate in disokay 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):
# clear the offset transforms
_off = self.offset_transform.to_values() # to be restored later
self.ref_offset_transform.clear()
self.offset_transform.clear()
# calculate the extent
bboxes = [c.get_window_extent(renderer) for c in self._children]
ub = mtransforms.Bbox.union(bboxes)
# adjust ref_offset_tansform
self.ref_offset_transform.translate(-ub.x0, -ub.y0)
# restor offset transform
mtx = self.offset_transform.matrix_from_values(*_off)
self.offset_transform.set_matrix(mtx)
return ub.width, ub.height, 0., 0.
def draw(self, renderer):
"""
Draw the children
"""
for c in self._children:
c.draw(renderer)
bbox_artist(self, renderer, fill=False, props=dict(pad=0.))
self.stale = False
class AnchoredOffsetbox(OffsetBox):
"""
An offset box placed according to the legend location
loc. AnchoredOffsetbox has a single child. When multiple children
is needed, use other OffsetBox class 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,
}