matplotlib.text — Matplotlib 3.1.2 documentation (original) (raw)
""" Classes for including text in a figure. """
import contextlib import logging import math import weakref
import numpy as np
from . import artist, cbook, docstring, rcParams from .artist import Artist from .font_manager import FontProperties from .lines import Line2D from .patches import FancyArrowPatch, FancyBboxPatch, Rectangle from .textpath import TextPath # Unused, but imported by others. from .transforms import ( Affine2D, Bbox, BboxBase, BboxTransformTo, IdentityTransform, Transform)
_log = logging.getLogger(name)
@contextlib.contextmanager def _wrap_text(textobj): """Temporarily inserts newlines to the text if the wrap option is enabled. """ if textobj.get_wrap(): old_text = textobj.get_text() try: textobj.set_text(textobj._get_wrapped_text()) yield textobj finally: textobj.set_text(old_text) else: yield textobj
Extracted from Text's method to serve as a function
[docs]def get_rotation(rotation): """ Return the text angle as float between 0 and 360 degrees.
*rotation* may be 'horizontal', 'vertical', or a numeric value in degrees.
"""
try:
return float(rotation) % 360
except (ValueError, TypeError):
if cbook._str_equal(rotation, 'horizontal') or rotation is None:
return 0.
elif cbook._str_equal(rotation, 'vertical'):
return 90.
else:
raise ValueError("rotation is {!r}; expected either 'horizontal', "
"'vertical', numeric value, or None"
.format(rotation))def _get_textbox(text, renderer):
"""
Calculate the bounding box of the text. Unlike
:meth:matplotlib.text.Text.get_extents method, The bbox size of
the text before the rotation is calculated.
"""
# TODO : This function may move into the Text class as a method. As a
# matter of fact, The information from the _get_textbox function
# should be available during the Text._get_layout() call, which is
# called within the _get_textbox. So, it would better to move this
# function as a method with some refactoring of _get_layout method.
projected_xs = []
projected_ys = []
theta = np.deg2rad(text.get_rotation())
tr = Affine2D().rotate(-theta)
_, parts, d = text._get_layout(renderer)
for t, wh, x, y in parts:
w, h = wh
xt1, yt1 = tr.transform_point((x, y))
yt1 -= d
xt2, yt2 = xt1 + w, yt1 + h
projected_xs.extend([xt1, xt2])
projected_ys.extend([yt1, yt2])
xt_box, yt_box = min(projected_xs), min(projected_ys)
w_box, h_box = max(projected_xs) - xt_box, max(projected_ys) - yt_box
x_box, y_box = Affine2D().rotate(theta).transform_point((xt_box, yt_box))
return x_box, y_box, w_box, h_box[docs]@cbook._define_aliases({ "color": ["c"], "fontfamily": ["family"], "fontproperties": ["font_properties"], "horizontalalignment": ["ha"], "multialignment": ["ma"], "fontname": ["name"], "fontsize": ["size"], "fontstretch": ["stretch"], "fontstyle": ["style"], "fontvariant": ["variant"], "verticalalignment": ["va"], "fontweight": ["weight"], }) class Text(Artist): """Handle storing and drawing of text in window or data coordinates."""
zorder = 3
_cached = cbook.maxdict(50)
def __repr__(self):
return "Text(%s, %s, %s)" % (self._x, self._y, repr(self._text))
def __init__(self,
x=0, y=0, text='',
color=None, # defaults to rc params
verticalalignment='baseline',
horizontalalignment='left',
multialignment=None,
fontproperties=None, # defaults to FontProperties()
rotation=None,
linespacing=None,
rotation_mode=None,
usetex=None, # defaults to rcParams['text.usetex']
wrap=False,
**kwargs
):
"""
Create a `.Text` instance at *x*, *y* with string *text*.
Valid kwargs are
%(Text)s
"""
Artist.__init__(self)
self._x, self._y = x, y
if color is None:
color = rcParams['text.color']
if fontproperties is None:
fontproperties = FontProperties()
elif isinstance(fontproperties, str):
fontproperties = FontProperties(fontproperties)
self._text = ''
self.set_text(text)
self.set_color(color)
self.set_usetex(usetex)
self.set_wrap(wrap)
self.set_verticalalignment(verticalalignment)
self.set_horizontalalignment(horizontalalignment)
self._multialignment = multialignment
self._rotation = rotation
self._fontproperties = fontproperties
self._bbox_patch = None # a FancyBboxPatch instance
self._renderer = None
if linespacing is None:
linespacing = 1.2 # Maybe use rcParam later.
self._linespacing = linespacing
self.set_rotation_mode(rotation_mode)
self.update(kwargs)[docs] def update(self, kwargs): """ Update properties from a dictionary. """ # Update bbox last, as it depends on font properties. sentinel = object() # bbox can be None, so use another sentinel. bbox = kwargs.pop("bbox", sentinel) super().update(kwargs) if bbox is not sentinel: self.set_bbox(bbox)
def __getstate__(self):
d = super().__getstate__()
# remove the cached _renderer (if it exists)
d['_renderer'] = None
return d[docs] def contains(self, mouseevent): """Test whether the mouse event occurred in the patch.
In the case of text, a hit is true anywhere in the
axis-aligned bounding-box containing the text.
Returns
-------
bool : bool
"""
if self._contains is not None:
return self._contains(self, mouseevent)
if not self.get_visible() or self._renderer is None:
return False, {}
l, b, w, h = self.get_window_extent().bounds
r, t = l + w, b + h
x, y = mouseevent.x, mouseevent.y
inside = (l <= x <= r and b <= y <= t)
cattr = {}
# if the text has a surrounding patch, also check containment for it,
# and merge the results with the results for the text.
if self._bbox_patch:
patch_inside, patch_cattr = self._bbox_patch.contains(mouseevent)
inside = inside or patch_inside
cattr["bbox_patch"] = patch_cattr
return inside, cattr
def _get_xy_display(self):
"""
Get the (possibly unit converted) transformed x, y in display coords.
"""
x, y = self.get_unitless_position()
return self.get_transform().transform_point((x, y))
def _get_multialignment(self):
if self._multialignment is not None:
return self._multialignment
else:
return self._horizontalalignment[docs] def get_rotation(self): """Return the text angle as float in degrees.""" return get_rotation(self._rotation) # string_or_number -> number
[docs] def set_rotation_mode(self, m): """ Set text rotation mode.
Parameters
----------
m : {None, 'default', 'anchor'}
If ``None`` or ``"default"``, the text will be first rotated, then
aligned according to their horizontal and vertical alignments. If
``"anchor"``, then alignment occurs before rotation.
"""
if m is None or m in ["anchor", "default"]:
self._rotation_mode = m
else:
raise ValueError("Unknown rotation_mode : %s" % repr(m))
self.stale = True[docs] def get_rotation_mode(self): """Get the text rotation mode.""" return self._rotation_mode
[docs] def update_from(self, other): """Copy properties from other to self.""" Artist.update_from(self, other) self._color = other._color self._multialignment = other._multialignment self._verticalalignment = other._verticalalignment self._horizontalalignment = other._horizontalalignment self._fontproperties = other._fontproperties.copy() self._rotation = other._rotation self._picker = other._picker self._linespacing = other._linespacing self.stale = True
def _get_layout(self, renderer):
"""
return the extent (bbox) of the text together with
multiple-alignment information. Note that it returns an extent
of a rotated text when necessary.
"""
key = self.get_prop_tup(renderer=renderer)
if key in self._cached:
return self._cached[key]
thisx, thisy = 0.0, 0.0
lines = self.get_text().split("\n") # Ensures lines is not empty.
ws = []
hs = []
xs = []
ys = []
# Full vertical extent of font, including ascenders and descenders:
_, lp_h, lp_d = renderer.get_text_width_height_descent(
"lp", self._fontproperties,
ismath="TeX" if self.get_usetex() else False)
min_dy = (lp_h - lp_d) * self._linespacing
for i, line in enumerate(lines):
clean_line, ismath = self._preprocess_math(line)
if clean_line:
w, h, d = renderer.get_text_width_height_descent(
clean_line, self._fontproperties, ismath=ismath)
else:
w = h = d = 0
# For multiline text, increase the line spacing when the text
# net-height (excluding baseline) is larger than that of a "l"
# (e.g., use of superscripts), which seems what TeX does.
h = max(h, lp_h)
d = max(d, lp_d)
ws.append(w)
hs.append(h)
# Metrics of the last line that are needed later:
baseline = (h - d) - thisy
if i == 0:
# position at baseline
thisy = -(h - d)
else:
# put baseline a good distance from bottom of previous line
thisy -= max(min_dy, (h - d) * self._linespacing)
xs.append(thisx) # == 0.
ys.append(thisy)
thisy -= d
# Metrics of the last line that are needed later:
descent = d
# Bounding box definition:
width = max(ws)
xmin = 0
xmax = width
ymax = 0
ymin = ys[-1] - descent # baseline of last line minus its descent
height = ymax - ymin
# get the rotation matrix
M = Affine2D().rotate_deg(self.get_rotation())
# now offset the individual text lines within the box
malign = self._get_multialignment()
if malign == 'left':
offset_layout = [(x, y) for x, y in zip(xs, ys)]
elif malign == 'center':
offset_layout = [(x + width / 2 - w / 2, y)
for x, y, w in zip(xs, ys, ws)]
elif malign == 'right':
offset_layout = [(x + width - w, y)
for x, y, w in zip(xs, ys, ws)]
# the corners of the unrotated bounding box
corners_horiz = np.array(
[(xmin, ymin), (xmin, ymax), (xmax, ymax), (xmax, ymin)])
# now rotate the bbox
corners_rotated = M.transform(corners_horiz)
# compute the bounds of the rotated box
xmin = corners_rotated[:, 0].min()
xmax = corners_rotated[:, 0].max()
ymin = corners_rotated[:, 1].min()
ymax = corners_rotated[:, 1].max()
width = xmax - xmin
height = ymax - ymin
# Now move the box to the target position offset the display
# bbox by alignment
halign = self._horizontalalignment
valign = self._verticalalignment
rotation_mode = self.get_rotation_mode()
if rotation_mode != "anchor":
# compute the text location in display coords and the offsets
# necessary to align the bbox with that location
if halign == 'center':
offsetx = (xmin + xmax) / 2
elif halign == 'right':
offsetx = xmax
else:
offsetx = xmin
if valign == 'center':
offsety = (ymin + ymax) / 2
elif valign == 'top':
offsety = ymax
elif valign == 'baseline':
offsety = ymin + descent
elif valign == 'center_baseline':
offsety = ymin + height - baseline / 2.0
else:
offsety = ymin
else:
xmin1, ymin1 = corners_horiz[0]
xmax1, ymax1 = corners_horiz[2]
if halign == 'center':
offsetx = (xmin1 + xmax1) / 2.0
elif halign == 'right':
offsetx = xmax1
else:
offsetx = xmin1
if valign == 'center':
offsety = (ymin1 + ymax1) / 2.0
elif valign == 'top':
offsety = ymax1
elif valign == 'baseline':
offsety = ymax1 - baseline
elif valign == 'center_baseline':
offsety = ymax1 - baseline / 2.0
else:
offsety = ymin1
offsetx, offsety = M.transform_point((offsetx, offsety))
xmin -= offsetx
ymin -= offsety
bbox = Bbox.from_bounds(xmin, ymin, width, height)
# now rotate the positions around the first x,y position
xys = M.transform(offset_layout) - (offsetx, offsety)
ret = bbox, list(zip(lines, zip(ws, hs), *xys.T)), descent
self._cached[key] = ret
return ret[docs] def set_bbox(self, rectprops): """ Draw a bounding box around self.
Parameters
----------
rectprops : dict with properties for `.patches.FancyBboxPatch`
The default boxstyle is 'square'. The mutation
scale of the `.patches.FancyBboxPatch` is set to the fontsize.
Examples
--------
::
t.set_bbox(dict(facecolor='red', alpha=0.5))
"""
if rectprops is not None:
props = rectprops.copy()
boxstyle = props.pop("boxstyle", None)
pad = props.pop("pad", None)
if boxstyle is None:
boxstyle = "square"
if pad is None:
pad = 4 # points
pad /= self.get_size() # to fraction of font size
else:
if pad is None:
pad = 0.3
# boxstyle could be a callable or a string
if isinstance(boxstyle, str) and "pad" not in boxstyle:
boxstyle += ",pad=%0.2f" % pad
bbox_transmuter = props.pop("bbox_transmuter", None)
self._bbox_patch = FancyBboxPatch(
(0., 0.),
1., 1.,
boxstyle=boxstyle,
bbox_transmuter=bbox_transmuter,
transform=IdentityTransform(),
**props)
else:
self._bbox_patch = None
self._update_clip_properties()[docs] def get_bbox_patch(self):
"""
Return the bbox Patch, or None if the .patches.FancyBboxPatch
is not made.
"""
return self._bbox_patch
[docs] def update_bbox_position_size(self, renderer): """ Update the location and the size of the bbox.
This method should be used when the position and size of the bbox needs
to be updated before actually drawing the bbox.
"""
if self._bbox_patch:
trans = self.get_transform()
# don't use self.get_unitless_position here, which refers to text
# position in Text, and dash position in TextWithDash:
posx = float(self.convert_xunits(self._x))
posy = float(self.convert_yunits(self._y))
posx, posy = trans.transform_point((posx, posy))
x_box, y_box, w_box, h_box = _get_textbox(self, renderer)
self._bbox_patch.set_bounds(0., 0., w_box, h_box)
theta = np.deg2rad(self.get_rotation())
tr = Affine2D().rotate(theta)
tr = tr.translate(posx + x_box, posy + y_box)
self._bbox_patch.set_transform(tr)
fontsize_in_pixel = renderer.points_to_pixels(self.get_size())
self._bbox_patch.set_mutation_scale(fontsize_in_pixel)
def _draw_bbox(self, renderer, posx, posy):
"""
Update the location and size of the bbox (`.patches.FancyBboxPatch`),
and draw.
"""
x_box, y_box, w_box, h_box = _get_textbox(self, renderer)
self._bbox_patch.set_bounds(0., 0., w_box, h_box)
theta = np.deg2rad(self.get_rotation())
tr = Affine2D().rotate(theta)
tr = tr.translate(posx + x_box, posy + y_box)
self._bbox_patch.set_transform(tr)
fontsize_in_pixel = renderer.points_to_pixels(self.get_size())
self._bbox_patch.set_mutation_scale(fontsize_in_pixel)
self._bbox_patch.draw(renderer)
def _update_clip_properties(self):
clipprops = dict(clip_box=self.clipbox,
clip_path=self._clippath,
clip_on=self._clipon)
if self._bbox_patch:
self._bbox_patch.update(clipprops)[docs] def set_clip_box(self, clipbox): # docstring inherited. super().set_clip_box(clipbox) self._update_clip_properties()
[docs] def set_clip_path(self, path, transform=None): # docstring inherited. super().set_clip_path(path, transform) self._update_clip_properties()
[docs] def set_clip_on(self, b): # docstring inherited. super().set_clip_on(b) self._update_clip_properties()
[docs] def get_wrap(self): """Return the wrapping state for the text.""" return self._wrap
[docs] def set_wrap(self, wrap): """Set the wrapping state for the text.
Parameters
----------
wrap : bool
"""
self._wrap = wrap
def _get_wrap_line_width(self):
"""
Return the maximum line width for wrapping text based on the current
orientation.
"""
x0, y0 = self.get_transform().transform(self.get_position())
figure_box = self.get_figure().get_window_extent()
# Calculate available width based on text alignment
alignment = self.get_horizontalalignment()
self.set_rotation_mode('anchor')
rotation = self.get_rotation()
left = self._get_dist_to_box(rotation, x0, y0, figure_box)
right = self._get_dist_to_box(
(180 + rotation) % 360, x0, y0, figure_box)
if alignment == 'left':
line_width = left
elif alignment == 'right':
line_width = right
else:
line_width = 2 * min(left, right)
return line_width
def _get_dist_to_box(self, rotation, x0, y0, figure_box):
"""
Return the distance from the given points to the boundaries of a
rotated box, in pixels.
"""
if rotation > 270:
quad = rotation - 270
h1 = y0 / math.cos(math.radians(quad))
h2 = (figure_box.x1 - x0) / math.cos(math.radians(90 - quad))
elif rotation > 180:
quad = rotation - 180
h1 = x0 / math.cos(math.radians(quad))
h2 = y0 / math.cos(math.radians(90 - quad))
elif rotation > 90:
quad = rotation - 90
h1 = (figure_box.y1 - y0) / math.cos(math.radians(quad))
h2 = x0 / math.cos(math.radians(90 - quad))
else:
h1 = (figure_box.x1 - x0) / math.cos(math.radians(rotation))
h2 = (figure_box.y1 - y0) / math.cos(math.radians(90 - rotation))
return min(h1, h2)
def _get_rendered_text_width(self, text):
"""
Return the width of a given text string, in pixels.
"""
w, h, d = self._renderer.get_text_width_height_descent(
text,
self.get_fontproperties(),
False)
return math.ceil(w)
def _get_wrapped_text(self):
"""
Return a copy of the text with new lines added, so that
the text is wrapped relative to the parent figure.
"""
# Not fit to handle breaking up latex syntax correctly, so
# ignore latex for now.
if self.get_usetex():
return self.get_text()
# Build the line incrementally, for a more accurate measure of length
line_width = self._get_wrap_line_width()
wrapped_str = ""
line = ""
for word in self.get_text().split(' '):
# New lines in the user's test need to force a split, so that it's
# not using the longest current line width in the line being built
sub_words = word.split('\n')
for i in range(len(sub_words)):
current_width = self._get_rendered_text_width(
line + ' ' + sub_words[i])
# Split long lines, and each newline found in the current word
if current_width > line_width or i > 0:
wrapped_str += line + '\n'
line = ""
if line == "":
line = sub_words[i]
else:
line += ' ' + sub_words[i]
return wrapped_str + line[docs] @artist.allow_rasterization
def draw(self, renderer):
"""
Draws the .Text object to the given renderer.
"""
if renderer is not None:
self._renderer = renderer
if not self.get_visible():
return
if self.get_text() == '':
return
renderer.open_group('text', self.get_gid())
with _wrap_text(self) as textobj:
bbox, info, descent = textobj._get_layout(renderer)
trans = textobj.get_transform()
# don't use textobj.get_position here, which refers to text
# position in Text, and dash position in TextWithDash:
posx = float(textobj.convert_xunits(textobj._x))
posy = float(textobj.convert_yunits(textobj._y))
posx, posy = trans.transform_point((posx, posy))
if not np.isfinite(posx) or not np.isfinite(posy):
_log.warning("posx and posy should be finite values")
return
canvasw, canvash = renderer.get_canvas_width_height()
# draw the FancyBboxPatch
if textobj._bbox_patch:
textobj._draw_bbox(renderer, posx, posy)
gc = renderer.new_gc()
gc.set_foreground(textobj.get_color())
gc.set_alpha(textobj.get_alpha())
gc.set_url(textobj._url)
textobj._set_gc_clip(gc)
angle = textobj.get_rotation()
for line, wh, x, y in info:
mtext = textobj if len(info) == 1 else None
x = x + posx
y = y + posy
if renderer.flipy():
y = canvash - y
clean_line, ismath = textobj._preprocess_math(line)
if textobj.get_path_effects():
from matplotlib.patheffects import PathEffectRenderer
textrenderer = PathEffectRenderer(
textobj.get_path_effects(), renderer)
else:
textrenderer = renderer
if textobj.get_usetex():
textrenderer.draw_tex(gc, x, y, clean_line,
textobj._fontproperties, angle,
mtext=mtext)
else:
textrenderer.draw_text(gc, x, y, clean_line,
textobj._fontproperties, angle,
ismath=ismath, mtext=mtext)
gc.restore()
renderer.close_group('text')
self.stale = False[docs] def get_color(self): "Return the color of the text" return self._color
[docs] def get_fontproperties(self):
"Return the .font_manager.FontProperties object"
return self._fontproperties
[docs] def get_fontfamily(self): """ Return the list of font families used for font lookup
See Also
--------
.font_manager.FontProperties.get_family
"""
return self._fontproperties.get_family()[docs] def get_fontname(self): """ Return the font name as string
See Also
--------
.font_manager.FontProperties.get_name
"""
return self._fontproperties.get_name()[docs] def get_fontstyle(self): """ Return the font style as string
See Also
--------
.font_manager.FontProperties.get_style
"""
return self._fontproperties.get_style()[docs] def get_fontsize(self): """ Return the font size as integer
See Also
--------
.font_manager.FontProperties.get_size_in_points
"""
return self._fontproperties.get_size_in_points()[docs] def get_fontvariant(self): """ Return the font variant as a string
See Also
--------
.font_manager.FontProperties.get_variant
"""
return self._fontproperties.get_variant()[docs] def get_fontweight(self): """ Get the font weight as string or number
See Also
--------
.font_manager.FontProperties.get_weight
"""
return self._fontproperties.get_weight()[docs] def get_stretch(self): """ Get the font stretch as a string or number
See Also
--------
.font_manager.FontProperties.get_stretch
"""
return self._fontproperties.get_stretch()[docs] def get_horizontalalignment(self): """ Return the horizontal alignment as string. Will be one of 'left', 'center' or 'right'. """ return self._horizontalalignment
[docs] def get_unitless_position(self): "Return the unitless position of the text as a tuple (x, y)" # This will get the position with all unit information stripped away. # This is here for convenience since it is done in several locations. x = float(self.convert_xunits(self._x)) y = float(self.convert_yunits(self._y)) return x, y
[docs] def get_position(self): "Return the position of the text as a tuple (x, y)" # This should return the same data (possible unitized) as was # specified with 'set_x' and 'set_y'. return self._x, self._y
[docs] def get_prop_tup(self, renderer=None): """ Return a hashable tuple of properties.
Not intended to be human readable, but useful for backends who
want to cache derived information about text (e.g., layouts) and
need to know if the text has changed.
"""
x, y = self.get_unitless_position()
renderer = renderer or self._renderer
return (x, y, self.get_text(), self._color,
self._verticalalignment, self._horizontalalignment,
hash(self._fontproperties),
self._rotation, self._rotation_mode,
self.figure.dpi, weakref.ref(renderer),
self._linespacing
)[docs] def get_text(self): "Get the text as string" return self._text
[docs] def get_verticalalignment(self): """ Return the vertical alignment as string. Will be one of 'top', 'center', 'bottom' or 'baseline'. """ return self._verticalalignment
[docs] def get_window_extent(self, renderer=None, dpi=None):
"""
Return the Bbox bounding the text, in display units.
In addition to being used internally, this is useful for specifying
clickable regions in a png file on a web page.
Parameters
----------
renderer : Renderer, optional
A renderer is needed to compute the bounding box. If the artist
has already been drawn, the renderer is cached; thus, it is only
necessary to pass this argument when calling `get_window_extent`
before the first `draw`. In practice, it is usually easier to
trigger a draw first (e.g. by saving the figure).
dpi : float, optional
The dpi value for computing the bbox, defaults to
``self.figure.dpi`` (*not* the renderer dpi); should be set e.g. if
to match regions with a figure saved with a custom dpi value.
"""
#return _unit_box
if not self.get_visible():
return Bbox.unit()
if dpi is not None:
dpi_orig = self.figure.dpi
self.figure.dpi = dpi
if self.get_text() == '':
tx, ty = self._get_xy_display()
return Bbox.from_bounds(tx, ty, 0, 0)
if renderer is not None:
self._renderer = renderer
if self._renderer is None:
self._renderer = self.figure._cachedRenderer
if self._renderer is None:
raise RuntimeError('Cannot get window extent w/o renderer')
bbox, info, descent = self._get_layout(self._renderer)
x, y = self.get_unitless_position()
x, y = self.get_transform().transform_point((x, y))
bbox = bbox.translated(x, y)
if dpi is not None:
self.figure.dpi = dpi_orig
return bbox[docs] def set_backgroundcolor(self, color): """ Set the background color of the text by updating the bbox.
Parameters
----------
color : color
See Also
--------
.set_bbox : To change the position of the bounding box
"""
if self._bbox_patch is None:
self.set_bbox(dict(facecolor=color, edgecolor=color))
else:
self._bbox_patch.update(dict(facecolor=color))
self._update_clip_properties()
self.stale = True[docs] def set_color(self, color): """ Set the foreground color of the text
Parameters
----------
color : color
"""
# Make sure it is hashable, or get_prop_tup will fail.
try:
hash(color)
except TypeError:
color = tuple(color)
self._color = color
self.stale = True[docs] def set_horizontalalignment(self, align): """ Set the horizontal alignment to one of
Parameters
----------
align : {'center', 'right', 'left'}
"""
cbook._check_in_list(['center', 'right', 'left'], align=align)
self._horizontalalignment = align
self.stale = True[docs] def set_multialignment(self, align): """ Set the alignment for multiple lines layout. The layout of the bounding box of all the lines is determined by the horizontalalignment and verticalalignment properties, but the multiline text within that box can be
Parameters
----------
align : {'left', 'right', 'center'}
"""
cbook._check_in_list(['center', 'right', 'left'], align=align)
self._multialignment = align
self.stale = True[docs] def set_linespacing(self, spacing): """ Set the line spacing as a multiple of the font size. Default is 1.2.
Parameters
----------
spacing : float (multiple of font size)
"""
self._linespacing = spacing
self.stale = True[docs] def set_fontfamily(self, fontname): """ Set the font family. May be either a single string, or a list of strings in decreasing priority. Each string may be either a real font name or a generic font class name. If the latter, the specific font names will be looked up in the corresponding rcParams.
If a `Text` instance is constructed with ``fontfamily=None``, then the
font is set to :rc:`font.family`, and the
same is done when `set_fontfamily()` is called on an existing
`Text` instance.
Parameters
----------
fontname : {FONTNAME, 'serif', 'sans-serif', 'cursive', 'fantasy', \'monospace'}
See Also
--------
.font_manager.FontProperties.set_family
"""
self._fontproperties.set_family(fontname)
self.stale = True[docs] def set_fontvariant(self, variant): """ Set the font variant, either 'normal' or 'small-caps'.
Parameters
----------
variant : {'normal', 'small-caps'}
See Also
--------
.font_manager.FontProperties.set_variant
"""
self._fontproperties.set_variant(variant)
self.stale = True[docs] def set_fontstyle(self, fontstyle): """ Set the font style.
Parameters
----------
fontstyle : {'normal', 'italic', 'oblique'}
See Also
--------
.font_manager.FontProperties.set_style
"""
self._fontproperties.set_style(fontstyle)
self.stale = True[docs] def set_fontsize(self, fontsize): """ Set the font size. May be either a size string, relative to the default font size, or an absolute font size in points.
Parameters
----------
fontsize : {size in points, 'xx-small', 'x-small', 'small', 'medium', \'large', 'x-large', 'xx-large'}
See Also
--------
.font_manager.FontProperties.set_size
"""
self._fontproperties.set_size(fontsize)
self.stale = True[docs] def set_fontweight(self, weight): """ Set the font weight.
Parameters
----------
weight : {a numeric value in range 0-1000, 'ultralight', 'light', \'normal', 'regular', 'book', 'medium', 'roman', 'semibold', 'demibold',
'demi', 'bold', 'heavy', 'extra bold', 'black'}
See Also
--------
.font_manager.FontProperties.set_weight
"""
self._fontproperties.set_weight(weight)
self.stale = True[docs] def set_fontstretch(self, stretch): """ Set the font stretch (horizontal condensation or expansion).
Parameters
----------
stretch : {a numeric value in range 0-1000, 'ultra-condensed', \'extra-condensed', 'condensed', 'semi-condensed', 'normal', 'semi-expanded',
'expanded', 'extra-expanded', 'ultra-expanded'}
See Also
--------
.font_manager.FontProperties.set_stretch
"""
self._fontproperties.set_stretch(stretch)
self.stale = True[docs] def set_position(self, xy): """ Set the (x, y) position of the text.
Parameters
----------
xy : (float, float)
"""
self.set_x(xy[0])
self.set_y(xy[1])[docs] def set_x(self, x): """ Set the x position of the text.
Parameters
----------
x : float
"""
self._x = x
self.stale = True[docs] def set_y(self, y): """ Set the y position of the text.
Parameters
----------
y : float
"""
self._y = y
self.stale = True[docs] def set_rotation(self, s): """ Set the rotation of the text.
Parameters
----------
s : {angle in degrees, 'vertical', 'horizontal'}
"""
self._rotation = s
self.stale = True[docs] def set_verticalalignment(self, align): """ Set the vertical alignment
Parameters
----------
align : {'center', 'top', 'bottom', 'baseline', 'center_baseline'}
"""
cbook._check_in_list(
['top', 'bottom', 'center', 'baseline', 'center_baseline'],
align=align)
self._verticalalignment = align
self.stale = True[docs] def set_text(self, s): """ Set the text string s.
It may contain newlines (``\\n``) or math in LaTeX syntax.
Parameters
----------
s : object
Any object gets converted to its `str`, except ``None`` which
becomes ``''``.
"""
if s is None:
s = ''
if s != self._text:
self._text = str(s)
self.stale = True[docs] @staticmethod @cbook.deprecated("3.1") def is_math_text(s, usetex=None): """ Returns a cleaned string and a boolean flag. The flag indicates if the given string s contains any mathtext, determined by counting unescaped dollar signs. If no mathtext is present, the cleaned string has its dollar signs unescaped. If usetex is on, the flag always has the value "TeX". """ # Did we find an even number of non-escaped dollar signs? # If so, treat is as math text. if usetex is None: usetex = rcParams['text.usetex'] if usetex: if s == ' ': s = r'\ ' return s, 'TeX'
if cbook.is_math_text(s):
return s, True
else:
return s.replace(r'\$', '$'), False
def _preprocess_math(self, s):
"""
Return the string *s* after mathtext preprocessing, and the kind of
mathtext support needed.
- If *self* is configured to use TeX, return *s* unchanged except that
a single space gets escaped, and the flag "TeX".
- Otherwise, if *s* is mathtext (has an even number of unescaped dollar
signs), return *s* and the flag True.
- Otherwise, return *s* with dollar signs unescaped, and the flag
False.
"""
if self.get_usetex():
if s == " ":
s = r"\ "
return s, "TeX"
elif cbook.is_math_text(s):
return s, True
else:
return s.replace(r"\$", "$"), False[docs] def set_fontproperties(self, fp): """ Set the font properties that control the text.
Parameters
----------
fp : `.font_manager.FontProperties`
"""
if isinstance(fp, str):
fp = FontProperties(fp)
self._fontproperties = fp.copy()
self.stale = True[docs] def set_usetex(self, usetex):
"""
Parameters
----------
usetex : bool or None
Whether to render using TeX, None means to use
:rc:text.usetex.
"""
if usetex is None:
self._usetex = rcParams['text.usetex']
else:
self._usetex = bool(usetex)
self.stale = True
[docs] def get_usetex(self):
"""Return whether this Text object uses TeX for rendering."""
return self._usetex
[docs] def set_fontname(self, fontname):
"""
Alias for set_family.
One-way alias only: the getter differs.
Parameters
----------
fontname : {FONTNAME, 'serif', 'sans-serif', 'cursive', 'fantasy', \'monospace'}
See Also
--------
.font_manager.FontProperties.set_family
"""
return self.set_family(fontname)docstring.interpd.update(Text=artist.kwdoc(Text)) docstring.dedent_interpd(Text.init)
[docs]@cbook.deprecated("3.1", alternative="Annotation")
class TextWithDash(Text):
"""
This is basically a :class:~matplotlib.text.Text with a dash
(drawn with a :class:~matplotlib.lines.Line2D) before/after
it. It is intended to be a drop-in replacement for
:class:~matplotlib.text.Text, and should behave identically to
it when dashlength = 0.0.
The dash always comes between the point specified by
:meth:`~matplotlib.text.Text.set_position` and the text. When a
dash exists, the text alignment arguments (*horizontalalignment*,
*verticalalignment*) are ignored.
*dashlength* is the length of the dash in canvas units.
(default = 0.0).
*dashdirection* is one of 0 or 1, where 0 draws the dash after the
text and 1 before. (default = 0).
*dashrotation* specifies the rotation of the dash, and should
generally stay *None*. In this case
:meth:`~matplotlib.text.TextWithDash.get_dashrotation` returns
:meth:`~matplotlib.text.Text.get_rotation`. (i.e., the dash takes
its rotation from the text's rotation). Because the text center is
projected onto the dash, major deviations in the rotation cause
what may be considered visually unappealing results.
(default = *None*)
*dashpad* is a padding length to add (or subtract) space
between the text and the dash, in canvas units.
(default = 3)
*dashpush* "pushes" the dash and text away from the point
specified by :meth:`~matplotlib.text.Text.set_position` by the
amount in canvas units. (default = 0)
.. note::
The alignment of the two objects is based on the bounding box
of the :class:`~matplotlib.text.Text`, as obtained by
:meth:`~matplotlib.artist.Artist.get_window_extent`. This, in
turn, appears to depend on the font metrics as given by the
rendering backend. Hence the quality of the "centering" of the
label text with respect to the dash varies depending on the
backend used.
.. note::
I'm not sure that I got the
:meth:`~matplotlib.text.TextWithDash.get_window_extent` right,
or whether that's sufficient for providing the object bounding
box.
"""
__name__ = 'textwithdash'
def __str__(self):
return "TextWithDash(%g, %g, %r)" % (self._x, self._y, self._text)
def __init__(self,
x=0, y=0, text='',
color=None, # defaults to rc params
verticalalignment='center',
horizontalalignment='center',
multialignment=None,
fontproperties=None, # defaults to FontProperties()
rotation=None,
linespacing=None,
dashlength=0.0,
dashdirection=0,
dashrotation=None,
dashpad=3,
dashpush=0,
):
Text.__init__(self, x=x, y=y, text=text, color=color,
verticalalignment=verticalalignment,
horizontalalignment=horizontalalignment,
multialignment=multialignment,
fontproperties=fontproperties,
rotation=rotation,
linespacing=linespacing,
)
# The position (x,y) values for text and dashline
# are bogus as given in the instantiation; they will
# be set correctly by update_coords() in draw()
self.dashline = Line2D(xdata=(x, x),
ydata=(y, y),
color='k',
linestyle='-')
self._dashx = float(x)
self._dashy = float(y)
self._dashlength = dashlength
self._dashdirection = dashdirection
self._dashrotation = dashrotation
self._dashpad = dashpad
self._dashpush = dashpush
#self.set_bbox(dict(pad=0))[docs] def get_unitless_position(self): "Return the unitless position of the text as a tuple (x, y)" # This will get the position with all unit information stripped away. # This is here for convenience since it is done in several locations. x = float(self.convert_xunits(self._dashx)) y = float(self.convert_yunits(self._dashy)) return x, y
[docs] def get_position(self): "Return the position of the text as a tuple (x, y)" # This should return the same data (possibly unitized) as was # specified with set_x and set_y return self._dashx, self._dashy
[docs] def get_prop_tup(self, renderer=None): """ Return a hashable tuple of properties.
Not intended to be human readable, but useful for backends who
want to cache derived information about text (e.g., layouts) and
need to know if the text has changed.
"""
props = [p for p in Text.get_prop_tup(self, renderer=renderer)]
props.extend([self._x, self._y, self._dashlength,
self._dashdirection, self._dashrotation, self._dashpad,
self._dashpush])
return tuple(props)[docs] def draw(self, renderer):
"""
Draw the :class:TextWithDash object to the given renderer.
"""
self.update_coords(renderer)
Text.draw(self, renderer)
if self.get_dashlength() > 0.0:
self.dashline.draw(renderer)
self.stale = False
[docs] def update_coords(self, renderer): """ Computes the actual x, y coordinates for text based on the input x, y and the dashlength. Since the rotation is with respect to the actual canvas's coordinates we need to map back and forth. """ dashx, dashy = self.get_unitless_position() dashlength = self.get_dashlength() # Shortcircuit this process if we don't have a dash if dashlength == 0.0: self._x, self._y = dashx, dashy return
dashrotation = self.get_dashrotation()
dashdirection = self.get_dashdirection()
dashpad = self.get_dashpad()
dashpush = self.get_dashpush()
angle = get_rotation(dashrotation)
theta = np.pi * (angle / 180.0 + dashdirection - 1)
cos_theta, sin_theta = np.cos(theta), np.sin(theta)
transform = self.get_transform()
# Compute the dash end points
# The 'c' prefix is for canvas coordinates
cxy = transform.transform_point((dashx, dashy))
cd = np.array([cos_theta, sin_theta])
c1 = cxy + dashpush * cd
c2 = cxy + (dashpush + dashlength) * cd
inverse = transform.inverted()
(x1, y1) = inverse.transform_point(tuple(c1))
(x2, y2) = inverse.transform_point(tuple(c2))
self.dashline.set_data((x1, x2), (y1, y2))
# We now need to extend this vector out to
# the center of the text area.
# The basic problem here is that we're "rotating"
# two separate objects but want it to appear as
# if they're rotated together.
# This is made non-trivial because of the
# interaction between text rotation and alignment -
# text alignment is based on the bbox after rotation.
# We reset/force both alignments to 'center'
# so we can do something relatively reasonable.
# There's probably a better way to do this by
# embedding all this in the object's transformations,
# but I don't grok the transformation stuff
# well enough yet.
we = Text.get_window_extent(self, renderer=renderer)
w, h = we.width, we.height
# Watch for zeros
if sin_theta == 0.0:
dx = w
dy = 0.0
elif cos_theta == 0.0:
dx = 0.0
dy = h
else:
tan_theta = sin_theta / cos_theta
dx = w
dy = w * tan_theta
if dy > h or dy < -h:
dy = h
dx = h / tan_theta
cwd = np.array([dx, dy]) / 2
cwd *= 1 + dashpad / np.sqrt(np.dot(cwd, cwd))
cw = c2 + (dashdirection * 2 - 1) * cwd
newx, newy = inverse.transform_point(tuple(cw))
self._x, self._y = newx, newy
# Now set the window extent
# I'm not at all sure this is the right way to do this.
we = Text.get_window_extent(self, renderer=renderer)
self._twd_window_extent = we.frozen()
self._twd_window_extent.update_from_data_xy(np.array([c1]), False)
# Finally, make text align center
Text.set_horizontalalignment(self, 'center')
Text.set_verticalalignment(self, 'center')[docs] def get_window_extent(self, renderer=None):
'''
Return a :class:~matplotlib.transforms.Bbox object bounding
the text, in display units.
In addition to being used internally, this is useful for
specifying clickable regions in a png file on a web page.
*renderer* defaults to the _renderer attribute of the text
object. This is not assigned until the first execution of
:meth:`draw`, so you must use this kwarg if you want
to call :meth:`get_window_extent` prior to the first
:meth:`draw`. For getting web page regions, it is
simpler to call the method after saving the figure.
'''
self.update_coords(renderer)
if self.get_dashlength() == 0.0:
return Text.get_window_extent(self, renderer=renderer)
else:
return self._twd_window_extent[docs] def get_dashlength(self): """ Get the length of the dash. """ return self._dashlength
[docs] def set_dashlength(self, dl): """ Set the length of the dash, in canvas units.
Parameters
----------
dl : float
"""
self._dashlength = dl
self.stale = True[docs] def get_dashdirection(self): """ Get the direction dash. 1 is before the text and 0 is after. """ return self._dashdirection
[docs] def set_dashdirection(self, dd): """ Set the direction of the dash following the text. 1 is before the text and 0 is after. The default is 0, which is what you'd want for the typical case of ticks below and on the left of the figure.
Parameters
----------
dd : int (1 is before, 0 is after)
"""
self._dashdirection = dd
self.stale = True[docs] def get_dashrotation(self): """ Get the rotation of the dash in degrees. """ if self._dashrotation is None: return self.get_rotation() else: return self._dashrotation
[docs] def set_dashrotation(self, dr): """ Set the rotation of the dash, in degrees.
Parameters
----------
dr : float
"""
self._dashrotation = dr
self.stale = True[docs] def get_dashpad(self): """ Get the extra spacing between the dash and the text, in canvas units. """ return self._dashpad
[docs] def set_dashpad(self, dp): """ Set the "pad" of the TextWithDash, which is the extra spacing between the dash and the text, in canvas units.
Parameters
----------
dp : float
"""
self._dashpad = dp
self.stale = True[docs] def get_dashpush(self): """ Get the extra spacing between the dash and the specified text position, in canvas units. """ return self._dashpush
[docs] def set_dashpush(self, dp): """ Set the "push" of the TextWithDash, which is the extra spacing between the beginning of the dash and the specified position.
Parameters
----------
dp : float
"""
self._dashpush = dp
self.stale = True[docs] def set_position(self, xy):
"""
Set the (x, y) position of the :class:TextWithDash.
Parameters
----------
xy : (float, float)
"""
self.set_x(xy[0])
self.set_y(xy[1])[docs] def set_x(self, x):
"""
Set the x position of the :class:TextWithDash.
Parameters
----------
x : float
"""
self._dashx = float(x)
self.stale = True[docs] def set_y(self, y):
"""
Set the y position of the :class:TextWithDash.
Parameters
----------
y : float
"""
self._dashy = float(y)
self.stale = True[docs] def set_transform(self, t):
"""
Set the :class:matplotlib.transforms.Transform instance used
by this artist.
Parameters
----------
t : `~matplotlib.transforms.Transform`
"""
Text.set_transform(self, t)
self.dashline.set_transform(t)
self.stale = True[docs] def get_figure(self): """Return the figure instance the artist belongs to.""" return self.figure
[docs] def set_figure(self, fig): """ Set the figure instance the artist belongs to.
Parameters
----------
fig : `~matplotlib.figure.Figure`
"""
Text.set_figure(self, fig)
self.dashline.set_figure(fig)docstring.interpd.update(TextWithDash=artist.kwdoc(TextWithDash))
[docs]class OffsetFrom(object):
'Callable helper class for working with Annotation'
def init(self, artist, ref_coord, unit="points"):
'''
Parameters
----------
artist : Artist, BboxBase, or Transform
The object to compute the offset from.
ref_coord : length 2 sequence
If `artist` is an `Artist` or `BboxBase`, this values is
the location to of the offset origin in fractions of the
`artist` bounding box.
If `artist` is a transform, the offset origin is the
transform applied to this value.
unit : {'points, 'pixels'}
The screen units to use (pixels or points) for the offset
input.
'''
self._artist = artist
self._ref_coord = ref_coord
self.set_unit(unit)[docs] def set_unit(self, unit):
'''
The unit for input to the transform used by __call__
Parameters
----------
unit : {'points', 'pixels'}
'''
cbook._check_in_list(["points", "pixels"], unit=unit)
self._unit = unit[docs] def get_unit(self):
'The unit for input to the transform used by __call__'
return self._unit
def _get_scale(self, renderer):
unit = self.get_unit()
if unit == "pixels":
return 1.
else:
return renderer.points_to_pixels(1.)
def __call__(self, renderer):
'''
Return the offset transform.
Parameters
----------
renderer : `RendererBase`
The renderer to use to compute the offset
Returns
-------
transform : `Transform`
Maps (x, y) in pixel or point units to screen units
relative to the given artist.
'''
if isinstance(self._artist, Artist):
bbox = self._artist.get_window_extent(renderer)
l, b, w, h = bbox.bounds
xf, yf = self._ref_coord
x, y = l + w * xf, b + h * yf
elif isinstance(self._artist, BboxBase):
l, b, w, h = self._artist.bounds
xf, yf = self._ref_coord
x, y = l + w * xf, b + h * yf
elif isinstance(self._artist, Transform):
x, y = self._artist.transform_point(self._ref_coord)
else:
raise RuntimeError("unknown type")
sc = self._get_scale(renderer)
tr = Affine2D().scale(sc, sc).translate(x, y)
return trclass _AnnotationBase(object): def init(self, xy, xycoords='data', annotation_clip=None):
self.xy = xy
self.xycoords = xycoords
self.set_annotation_clip(annotation_clip)
self._draggable = None
def _get_xy(self, renderer, x, y, s):
if isinstance(s, tuple):
s1, s2 = s
else:
s1, s2 = s, s
if s1 == 'data':
x = float(self.convert_xunits(x))
if s2 == 'data':
y = float(self.convert_yunits(y))
tr = self._get_xy_transform(renderer, s)
x1, y1 = tr.transform_point((x, y))
return x1, y1
def _get_xy_transform(self, renderer, s):
if isinstance(s, tuple):
s1, s2 = s
from matplotlib.transforms import blended_transform_factory
tr1 = self._get_xy_transform(renderer, s1)
tr2 = self._get_xy_transform(renderer, s2)
tr = blended_transform_factory(tr1, tr2)
return tr
elif callable(s):
tr = s(renderer)
if isinstance(tr, BboxBase):
return BboxTransformTo(tr)
elif isinstance(tr, Transform):
return tr
else:
raise RuntimeError("unknown return type ...")
elif isinstance(s, Artist):
bbox = s.get_window_extent(renderer)
return BboxTransformTo(bbox)
elif isinstance(s, BboxBase):
return BboxTransformTo(s)
elif isinstance(s, Transform):
return s
elif not isinstance(s, str):
raise RuntimeError("unknown coordinate type : %s" % s)
if s == 'data':
return self.axes.transData
elif s == 'polar':
from matplotlib.projections import PolarAxes
tr = PolarAxes.PolarTransform()
trans = tr + self.axes.transData
return trans
s_ = s.split()
if len(s_) != 2:
raise ValueError("%s is not a recognized coordinate" % s)
bbox0, xy0 = None, None
bbox_name, unit = s_
# if unit is offset-like
if bbox_name == "figure":
bbox0 = self.figure.bbox
elif bbox_name == "axes":
bbox0 = self.axes.bbox
# elif bbox_name == "bbox":
# if bbox is None:
# raise RuntimeError("bbox is specified as a coordinate but "
# "never set")
# bbox0 = self._get_bbox(renderer, bbox)
if bbox0 is not None:
xy0 = bbox0.bounds[:2]
elif bbox_name == "offset":
xy0 = self._get_ref_xy(renderer)
if xy0 is not None:
# reference x, y in display coordinate
ref_x, ref_y = xy0
from matplotlib.transforms import Affine2D
if unit == "points":
# dots per points
dpp = self.figure.get_dpi() / 72.
tr = Affine2D().scale(dpp, dpp)
elif unit == "pixels":
tr = Affine2D()
elif unit == "fontsize":
fontsize = self.get_size()
dpp = fontsize * self.figure.get_dpi() / 72.
tr = Affine2D().scale(dpp, dpp)
elif unit == "fraction":
w, h = bbox0.bounds[2:]
tr = Affine2D().scale(w, h)
else:
raise ValueError("%s is not a recognized coordinate" % s)
return tr.translate(ref_x, ref_y)
else:
raise ValueError("%s is not a recognized coordinate" % s)
def _get_ref_xy(self, renderer):
"""
return x, y (in display coordinate) that is to be used for a reference
of any offset coordinate
"""
def is_offset(s):
return isinstance(s, str) and s.split()[0] == "offset"
if isinstance(self.xycoords, tuple):
s1, s2 = self.xycoords
if is_offset(s1) or is_offset(s2):
raise ValueError("xycoords should not be an offset coordinate")
x, y = self.xy
x1, y1 = self._get_xy(renderer, x, y, s1)
x2, y2 = self._get_xy(renderer, x, y, s2)
return x1, y2
elif is_offset(self.xycoords):
raise ValueError("xycoords should not be an offset coordinate")
else:
x, y = self.xy
return self._get_xy(renderer, x, y, self.xycoords)
#raise RuntimeError("must be defined by the derived class")
# def _get_bbox(self, renderer):
# if hasattr(bbox, "bounds"):
# return bbox
# elif hasattr(bbox, "get_window_extent"):
# bbox = bbox.get_window_extent()
# return bbox
# else:
# raise ValueError("A bbox instance is expected but got %s" %
# str(bbox))
def set_annotation_clip(self, b):
"""
set *annotation_clip* attribute.
* True: the annotation will only be drawn when self.xy is inside
the axes.
* False: the annotation will always be drawn regardless of its
position.
* None: the self.xy will be checked only if *xycoords* is "data"
"""
self._annotation_clip = b
def get_annotation_clip(self):
"""
Return *annotation_clip* attribute.
See :meth:`set_annotation_clip` for the meaning of return values.
"""
return self._annotation_clip
def _get_position_xy(self, renderer):
"Return the pixel position of the annotated point."
x, y = self.xy
return self._get_xy(renderer, x, y, self.xycoords)
def _check_xy(self, renderer, xy_pixel):
"""
given the xy pixel coordinate, check if the annotation need to
be drawn.
"""
b = self.get_annotation_clip()
if b or (b is None and self.xycoords == "data"):
# check if self.xy is inside the axes.
if not self.axes.contains_point(xy_pixel):
return False
return True
def draggable(self, state=None, use_blit=False):
"""
Set the draggable state -- if state is
* None : toggle the current state
* True : turn draggable on
* False : turn draggable off
If draggable is on, you can drag the annotation on the canvas with
the mouse. The DraggableAnnotation helper instance is returned if
draggable is on.
"""
from matplotlib.offsetbox import DraggableAnnotation
is_draggable = self._draggable is not None
# if state is None we'll toggle
if state is None:
state = not is_draggable
if state:
if self._draggable is None:
self._draggable = DraggableAnnotation(self, use_blit)
else:
if self._draggable is not None:
self._draggable.disconnect()
self._draggable = None
return self._draggable[docs]class Annotation(Text, _AnnotationBase):
"""
An .Annotation is a .Text that can refer to a specific position xy.
Optionally an arrow pointing from the text to xy can be drawn.
Attributes
----------
xy
The annotated position.
xycoords
The coordinate system for *xy*.
arrow_patch
A `.FancyArrowPatch` to point from *xytext* to *xy*.
"""
def __str__(self):
return "Annotation(%g, %g, %r)" % (self.xy[0], self.xy[1], self._text)
@cbook._rename_parameter("3.1", "s", "text")
def __init__(self, text, xy,
xytext=None,
xycoords='data',
textcoords=None,
arrowprops=None,
annotation_clip=None,
**kwargs):
"""
Annotate the point *xy* with text *text*.
In the simplest form, the text is placed at *xy*.
Optionally, the text can be displayed in another position *xytext*.
An arrow pointing from the text to the annotated point *xy* can then
be added by defining *arrowprops*.
Parameters
----------
text : str
The text of the annotation. *s* is a deprecated synonym for this
parameter.
xy : (float, float)
The point *(x,y)* to annotate.
xytext : (float, float), optional
The position *(x,y)* to place the text at.
If *None*, defaults to *xy*.
xycoords : str, `.Artist`, `.Transform`, callable or tuple, optional
The coordinate system that *xy* is given in. The following types
of values are supported:
- One of the following strings:
================= =============================================
Value Description
================= =============================================
'figure points' Points from the lower left of the figure
'figure pixels' Pixels from the lower left of the figure
'figure fraction' Fraction of figure from lower left
'axes points' Points from lower left corner of axes
'axes pixels' Pixels from lower left corner of axes
'axes fraction' Fraction of axes from lower left
'data' Use the coordinate system of the object being
annotated (default)
'polar' *(theta,r)* if not native 'data' coordinates
================= =============================================
- An `.Artist`: *xy* is interpreted as a fraction of the artists
`~matplotlib.transforms.Bbox`. E.g. *(0, 0)* would be the lower
left corner of the bounding box and *(0.5, 1)* would be the
center top of the bounding box.
- A `.Transform` to transform *xy* to screen coordinates.
- A function with one of the following signatures::
def transform(renderer) -> Bbox
def transform(renderer) -> Transform
where *renderer* is a `.RendererBase` subclass.
The result of the function is interpreted like the `.Artist` and
`.Transform` cases above.
- A tuple *(xcoords, ycoords)* specifying separate coordinate
systems for *x* and *y*. *xcoords* and *ycoords* must each be
of one of the above described types.
See :ref:`plotting-guide-annotation` for more details.
Defaults to 'data'.
textcoords : str, `.Artist`, `.Transform`, callable or tuple, optional
The coordinate system that *xytext* is given in.
All *xycoords* values are valid as well as the following
strings:
================= =========================================
Value Description
================= =========================================
'offset points' Offset (in points) from the *xy* value
'offset pixels' Offset (in pixels) from the *xy* value
================= =========================================
Defaults to the value of *xycoords*, i.e. use the same coordinate
system for annotation point and text position.
arrowprops : dict, optional
The properties used to draw a
`~matplotlib.patches.FancyArrowPatch` arrow between the
positions *xy* and *xytext*.
If *arrowprops* does not contain the key 'arrowstyle' the
allowed keys are:
========== ======================================================
Key Description
========== ======================================================
width The width of the arrow in points
headwidth The width of the base of the arrow head in points
headlength The length of the arrow head in points
shrink Fraction of total length to shrink from both ends
? Any key to :class:`matplotlib.patches.FancyArrowPatch`
========== ======================================================
If *arrowprops* contains the key 'arrowstyle' the
above keys are forbidden. The allowed values of
``'arrowstyle'`` are:
============ =============================================
Name Attrs
============ =============================================
``'-'`` None
``'->'`` head_length=0.4,head_width=0.2
``'-['`` widthB=1.0,lengthB=0.2,angleB=None
``'|-|'`` widthA=1.0,widthB=1.0
``'-|>'`` head_length=0.4,head_width=0.2
``'<-'`` head_length=0.4,head_width=0.2
``'<->'`` head_length=0.4,head_width=0.2
``'<|-'`` head_length=0.4,head_width=0.2
``'<|-|>'`` head_length=0.4,head_width=0.2
``'fancy'`` head_length=0.4,head_width=0.4,tail_width=0.4
``'simple'`` head_length=0.5,head_width=0.5,tail_width=0.2
``'wedge'`` tail_width=0.3,shrink_factor=0.5
============ =============================================
Valid keys for `~matplotlib.patches.FancyArrowPatch` are:
=============== ==================================================
Key Description
=============== ==================================================
arrowstyle the arrow style
connectionstyle the connection style
relpos default is (0.5, 0.5)
patchA default is bounding box of the text
patchB default is None
shrinkA default is 2 points
shrinkB default is 2 points
mutation_scale default is text size (in points)
mutation_aspect default is 1.
? any key for :class:`matplotlib.patches.PathPatch`
=============== ==================================================
Defaults to None, i.e. no arrow is drawn.
annotation_clip : bool or None, optional
Whether to draw the annotation when the annotation point *xy* is
outside the axes area.
- If *True*, the annotation will only be drawn when *xy* is
within the axes.
- If *False*, the annotation will always be drawn.
- If *None*, the annotation will only be drawn when *xy* is
within the axes and *xycoords* is 'data'.
Defaults to *None*.
**kwargs
Additional kwargs are passed to `~matplotlib.text.Text`.
Returns
-------
annotation : `.Annotation`
See Also
--------
:ref:`plotting-guide-annotation`.
"""
_AnnotationBase.__init__(self,
xy,
xycoords=xycoords,
annotation_clip=annotation_clip)
# warn about wonky input data
if (xytext is None and
textcoords is not None and
textcoords != xycoords):
cbook._warn_external("You have used the `textcoords` kwarg, but "
"not the `xytext` kwarg. This can lead to "
"surprising results.")
# clean up textcoords and assign default
if textcoords is None:
textcoords = self.xycoords
self._textcoords = textcoords
# cleanup xytext defaults
if xytext is None:
xytext = self.xy
x, y = xytext
Text.__init__(self, x, y, text, **kwargs)
self.arrowprops = arrowprops
if arrowprops is not None:
if "arrowstyle" in arrowprops:
arrowprops = self.arrowprops.copy()
self._arrow_relpos = arrowprops.pop("relpos", (0.5, 0.5))
else:
# modified YAArrow API to be used with FancyArrowPatch
shapekeys = ('width', 'headwidth', 'headlength',
'shrink', 'frac')
arrowprops = dict()
for key, val in self.arrowprops.items():
if key not in shapekeys:
arrowprops[key] = val # basic Patch properties
self.arrow_patch = FancyArrowPatch((0, 0), (1, 1),
**arrowprops)
else:
self.arrow_patch = None[docs] def contains(self, event): contains, tinfo = Text.contains(self, event) if self.arrow_patch is not None: in_patch, _ = self.arrow_patch.contains(event) contains = contains or in_patch
return contains, tinfo
@property
def xyann(self):
"""
The the text position.
See also *xytext* in `.Annotation`.
"""
return self.get_position()
@xyann.setter
def xyann(self, xytext):
self.set_position(xytext)
@property
def anncoords(self):
"""The coordinate system to use for `.Annotation.xyann`."""
return self._textcoords
@anncoords.setter
def anncoords(self, coords):
self._textcoords = coords
get_anncoords = anncoords.fget
get_anncoords.__doc__ = """
Return the coordinate system to use for `.Annotation.xyann`.
See also *xycoords* in `.Annotation`.
"""
set_anncoords = anncoords.fset
set_anncoords.__doc__ = """
Set the coordinate system to use for `.Annotation.xyann`.
See also *xycoords* in `.Annotation`.
"""[docs] def set_figure(self, fig): if self.arrow_patch is not None: self.arrow_patch.set_figure(fig) Artist.set_figure(self, fig)
[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_xytext(renderer, xy_pixel)
def _update_position_xytext(self, renderer, xy_pixel):
"""
Update the pixel positions of the annotation text and the arrow patch.
"""
# generate transformation,
self.set_transform(self._get_xy_transform(renderer, self.anncoords))
ox0, oy0 = self._get_xy_display()
ox1, oy1 = xy_pixel
if self.arrowprops is not None:
x0, y0 = xy_pixel
l, b, w, h = Text.get_window_extent(self, renderer).bounds
r = l + w
t = b + h
xc = 0.5 * (l + r)
yc = 0.5 * (b + t)
d = self.arrowprops.copy()
ms = d.pop("mutation_scale", self.get_size())
self.arrow_patch.set_mutation_scale(ms)
if "arrowstyle" not in d:
# Approximately simulate the YAArrow.
# Pop its kwargs:
shrink = d.pop('shrink', 0.0)
width = d.pop('width', 4)
headwidth = d.pop('headwidth', 12)
# Ignore frac--it is useless.
frac = d.pop('frac', None)
if frac is not None:
cbook._warn_external(
"'frac' option in 'arrowprops' is no longer supported;"
" use 'headlength' to set the head length in points.")
headlength = d.pop('headlength', 12)
# NB: ms is in pts
stylekw = dict(head_length=headlength / ms,
head_width=headwidth / ms,
tail_width=width / ms)
self.arrow_patch.set_arrowstyle('simple', **stylekw)
# using YAArrow style:
# pick the x,y corner of the text bbox closest to point
# annotated
xpos = ((l, 0), (xc, 0.5), (r, 1))
ypos = ((b, 0), (yc, 0.5), (t, 1))
_, (x, relposx) = min((abs(val[0] - x0), val) for val in xpos)
_, (y, relposy) = min((abs(val[0] - y0), val) for val in ypos)
self._arrow_relpos = (relposx, relposy)
r = np.hypot((y - y0), (x - x0))
shrink_pts = shrink * r / renderer.points_to_pixels(1)
self.arrow_patch.shrinkA = shrink_pts
self.arrow_patch.shrinkB = shrink_pts
# adjust the starting point of the arrow relative to
# the textbox.
# TODO : Rotation needs to be accounted.
relpos = self._arrow_relpos
bbox = Text.get_window_extent(self, renderer)
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))
if "patchA" in d:
self.arrow_patch.set_patchA(d.pop("patchA"))
else:
if self._bbox_patch:
self.arrow_patch.set_patchA(self._bbox_patch)
else:
pad = renderer.points_to_pixels(4)
if self.get_text() == "":
self.arrow_patch.set_patchA(None)
return
bbox = Text.get_window_extent(self, renderer)
l, b, w, h = bbox.bounds
l -= pad / 2.
b -= pad / 2.
w += pad
h += pad
r = Rectangle(xy=(l, b),
width=w,
height=h,
)
r.set_transform(IdentityTransform())
r.set_clip_on(False)
self.arrow_patch.set_patchA(r)[docs] @artist.allow_rasterization
def draw(self, renderer):
"""
Draw the :class:Annotation object to the given renderer.
"""
if renderer is not None:
self._renderer = renderer
if not self.get_visible():
return
xy_pixel = self._get_position_xy(renderer)
if not self._check_xy(renderer, xy_pixel):
return
self._update_position_xytext(renderer, xy_pixel)
self.update_bbox_position_size(renderer)
if self.arrow_patch is not None: # FancyArrowPatch
if self.arrow_patch.figure is None and self.figure is not None:
self.arrow_patch.figure = self.figure
self.arrow_patch.draw(renderer)
# Draw text, including FancyBboxPatch, after FancyArrowPatch.
# Otherwise, a wedge arrowstyle can land partly on top of the Bbox.
Text.draw(self, renderer)[docs] def get_window_extent(self, renderer=None):
"""
Return the Bbox bounding the text and arrow, in display units.
Parameters
----------
renderer : Renderer, optional
A renderer is needed to compute the bounding box. If the artist
has already been drawn, the renderer is cached; thus, it is only
necessary to pass this argument when calling `get_window_extent`
before the first `draw`. In practice, it is usually easier to
trigger a draw first (e.g. by saving the figure).
"""
# This block is the same as in Text.get_window_extent, but we need to
# set the renderer before calling update_positions().
if not self.get_visible():
return Bbox.unit()
if renderer is not None:
self._renderer = renderer
if self._renderer is None:
self._renderer = self.figure._cachedRenderer
if self._renderer is None:
raise RuntimeError('Cannot get window extent w/o renderer')
self.update_positions(self._renderer)
text_bbox = Text.get_window_extent(self)
bboxes = [text_bbox]
if self.arrow_patch is not None:
bboxes.append(self.arrow_patch.get_window_extent())
return Bbox.union(bboxes)
arrow = property(
fget=cbook.deprecated("3.0", message="arrow was deprecated in "
"Matplotlib 3.0 and will be removed in 3.2. Use arrow_patch "
"instead.")(lambda self: None),
fset=cbook.deprecated("3.0")(lambda self, value: None))docstring.interpd.update(Annotation=Annotation.init.doc)