Version 3.0.2
matplotlib
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Source code for matplotlib.text

"""
Classes for including text in a figure.
"""

import contextlib
import logging
import math
import warnings
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__)


def _process_text_args(override, fontdict=None, **kwargs):
    """Return an override dict.  See `~pyplot.text' docstring for info."""

    if fontdict is not None:
        override.update(fontdict)

    override.update(kwargs)
    return override


@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({ "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 callable(self._contains): 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] horizLayout = [] thisx, thisy = 0.0, 0.0 xmin, ymin = 0.0, 0.0 width, height = 0.0, 0.0 lines = self.get_text().split('\n') whs = np.zeros((len(lines), 2)) horizLayout = np.zeros((len(lines), 4)) # Find full vertical extent of font, # including ascenders and descenders: tmp, lp_h, lp_bl = renderer.get_text_width_height_descent('lp', self._fontproperties, ismath=False) offsety = (lp_h - lp_bl) * self._linespacing baseline = 0 for i, line in enumerate(lines): clean_line, ismath = self.is_math_text(line, self.get_usetex()) if clean_line: w, h, d = renderer.get_text_width_height_descent(clean_line, self._fontproperties, ismath=ismath) else: w, h, d = 0, 0, 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_bl) whs[i] = w, h baseline = (h - d) - thisy thisy -= max(offsety, (h - d) * self._linespacing) horizLayout[i] = thisx, thisy, w, h thisy -= d width = max(width, w) descent = d ymin = horizLayout[-1][1] ymax = horizLayout[0][1] + horizLayout[0][3] height = ymax - ymin xmax = xmin + width # get the rotation matrix M = Affine2D().rotate_deg(self.get_rotation()) offsetLayout = np.zeros((len(lines), 2)) offsetLayout[:] = horizLayout[:, 0:2] # now offset the individual text lines within the box if len(lines) > 1: # do the multiline aligment malign = self._get_multialignment() if malign == 'center': offsetLayout[:, 0] += width / 2.0 - horizLayout[:, 2] / 2.0 elif malign == 'right': offsetLayout[:, 0] += width - horizLayout[:, 2] # the corners of the unrotated bounding box cornersHoriz = np.array( [(xmin, ymin), (xmin, ymax), (xmax, ymax), (xmax, ymin)], float) cornersHoriz[:, 1] -= descent # now rotate the bbox cornersRotated = M.transform(cornersHoriz) txs = cornersRotated[:, 0] tys = cornersRotated[:, 1] # compute the bounds of the rotated box xmin, xmax = txs.min(), txs.max() ymin, ymax = tys.min(), tys.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 + width / 2.0) elif halign == 'right': offsetx = (xmin + width) else: offsetx = xmin if valign == 'center': offsety = (ymin + height / 2.0) elif valign == 'top': offsety = (ymin + height) elif valign == 'baseline': offsety = (ymin + height) - baseline elif valign == 'center_baseline': offsety = ymin + height - baseline / 2.0 else: offsety = ymin else: xmin1, ymin1 = cornersHoriz[0] xmax1, ymax1 = cornersHoriz[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 = (ymin1 + 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(offsetLayout) xys -= (offsetx, offsety) xs, ys = xys[:, 0], xys[:, 1] ret = bbox, list(zip(lines, whs, xs, ys)), 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: bbox = self._bbox_patch.update(clipprops)
[docs] def set_clip_box(self, clipbox): """ Set the artist's clip `~.transforms.Bbox`. Parameters ---------- clipbox : `matplotlib.transforms.Bbox` """ super().set_clip_box(clipbox) self._update_clip_properties()
[docs] def set_clip_path(self, path, transform=None): """ Set the artist's clip path, which may be: * a `~matplotlib.patches.Patch` (or subclass) instance * a `~matplotlib.path.Path` instance, in which case an optional `~matplotlib.transforms.Transform` instance may be provided, which will be applied to the path before using it for clipping. * *None*, to remove the clipping path For efficiency, if the path happens to be an axis-aligned rectangle, this method will set the clipping box to the corresponding rectangle and set the clipping path to *None*. ACCEPTS: { (`.path.Path`, `.transforms.Transform`), `.patches.Patch`, None } """ super().set_clip_path(path, transform) self._update_clip_properties()
[docs] def set_clip_on(self, b): """ Set whether artist uses clipping. When False, artists will be visible outside of the axes, which can lead to unexpected results. Parameters ---------- b : bool """ 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.is_math_text(line, self.get_usetex()) 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'} """ legal = ('center', 'right', 'left') if align not in legal: raise ValueError('Horizontal alignment must be one of %s' % str(legal)) 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 bu the horizontalalignment and verticalalignment properties, but the multiline text within that box can be Parameters ---------- align : {'left', 'right', 'center'} """ legal = ('center', 'right', 'left') if align not in legal: raise ValueError('Horizontal alignment must be one of %s' % str(legal)) 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. 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'} """ legal = ('top', 'bottom', 'center', 'baseline', 'center_baseline') if align not in legal: raise ValueError('Vertical alignment must be one of %s' % str(legal)) 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 : string or object castable to string (but ``None`` becomes ``''``) """ if s is None: s = '' if s != self._text: self._text = '%s' % (s,) self.stale = True
[docs] @staticmethod 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
[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. If the user has not manually set this value, it defaults to :rc:`text.usetex`. """ if self._usetex is None: return rcParams['text.usetex'] else: 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]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'} ''' if unit not in ["points", "pixels"]: raise ValueError("'unit' must be one of [ 'points' | 'pixels' ]") 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 tr
class _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) def __init__(self, s, xy, xytext=None, xycoords='data', textcoords=None, arrowprops=None, annotation_clip=None, **kwargs): """ Annotate the point *xy* with text *s*. 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 ---------- s : str The text of the annotation. 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): warnings.warn("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, s, **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: warnings.warn( "'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__)