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Source code for matplotlib.offsetbox

"""
The OffsetBox is a simple container artist. The child artist are meant
to be drawn at a relative position to its parent.  The [VH]Packer,
DrawingArea and TextArea are derived from the OffsetBox.

The [VH]Packer automatically adjust the relative postisions of their
children, which should be instances of the OffsetBox. This is used to
align similar artists together, e.g., in legend.

The DrawingArea can contain any Artist as a child. The
DrawingArea has a fixed width and height. The position of children
relative to the parent is fixed.  The TextArea is contains a single
Text instance. The width and height of the TextArea instance is the
width and height of the its child text.
"""

import warnings

import numpy as np

import matplotlib.transforms as mtransforms
import matplotlib.artist as martist
import matplotlib.text as mtext
import matplotlib.path as mpath
from matplotlib.transforms import Bbox, BboxBase, TransformedBbox

from matplotlib.font_manager import FontProperties
from matplotlib.patches import FancyBboxPatch, FancyArrowPatch
from matplotlib import rcParams

from matplotlib import docstring

from matplotlib.image import BboxImage

from matplotlib.patches import bbox_artist as mbbox_artist
from matplotlib.text import _AnnotationBase


DEBUG = False


# for debugging use
[docs]def bbox_artist(*args, **kwargs): if DEBUG: mbbox_artist(*args, **kwargs)
# _get_packed_offsets() and _get_aligned_offsets() are coded assuming # that we are packing boxes horizontally. But same function will be # used with vertical packing. def _get_packed_offsets(wd_list, total, sep, mode="fixed"): """ Geiven a list of (width, xdescent) of each boxes, calculate the total width and the x-offset positions of each items according to *mode*. xdescent is analogous to the usual descent, but along the x-direction. xdescent values are currently ignored. *wd_list* : list of (width, xdescent) of boxes to be packed. *sep* : spacing between boxes *total* : Intended total length. None if not used. *mode* : packing mode. 'fixed', 'expand', or 'equal'. """ w_list, d_list = zip(*wd_list) # d_list is currently not used. if mode == "fixed": offsets_ = np.cumsum([0] + [w + sep for w in w_list]) offsets = offsets_[:-1] if total is None: total = offsets_[-1] - sep return total, offsets elif mode == "expand": # This is a bit of a hack to avoid a TypeError when *total* # is None and used in conjugation with tight layout. if total is None: total = 1 if len(w_list) > 1: sep = (total - sum(w_list)) / (len(w_list) - 1) else: sep = 0 offsets_ = np.cumsum([0] + [w + sep for w in w_list]) offsets = offsets_[:-1] return total, offsets elif mode == "equal": maxh = max(w_list) if total is None: total = (maxh + sep) * len(w_list) else: sep = total / len(w_list) - maxh offsets = (maxh + sep) * np.arange(len(w_list)) return total, offsets else: raise ValueError("Unknown mode : %s" % (mode,)) def _get_aligned_offsets(hd_list, height, align="baseline"): """ Given a list of (height, descent) of each boxes, align the boxes with *align* and calculate the y-offsets of each boxes. total width and the offset positions of each items according to *mode*. xdescent is analogous to the usual descent, but along the x-direction. xdescent values are currently ignored. *hd_list* : list of (width, xdescent) of boxes to be aligned. *sep* : spacing between boxes *height* : Intended total length. None if not used. *align* : align mode. 'baseline', 'top', 'bottom', or 'center'. """ if height is None: height = max(h for h, d in hd_list) if align == "baseline": height_descent = max(h - d for h, d in hd_list) descent = max(d for h, d in hd_list) height = height_descent + descent offsets = [0. for h, d in hd_list] elif align in ["left", "top"]: descent = 0. offsets = [d for h, d in hd_list] elif align in ["right", "bottom"]: descent = 0. offsets = [height - h + d for h, d in hd_list] elif align == "center": descent = 0. offsets = [(height - h) * .5 + d for h, d in hd_list] else: raise ValueError("Unknown Align mode : %s" % (align,)) return height, descent, offsets
[docs]class OffsetBox(martist.Artist): """ The OffsetBox is a simple container artist. The child artist are meant to be drawn at a relative position to its parent. """ def __init__(self, *args, **kwargs): super().__init__(*args, **kwargs) # Clipping has not been implemented in the OffesetBox family, so # disable the clip flag for consistency. It can always be turned back # on to zero effect. self.set_clip_on(False) self._children = [] self._offset = (0, 0)
[docs] def set_figure(self, fig): """ Set the figure accepts a class:`~matplotlib.figure.Figure` instance """ martist.Artist.set_figure(self, fig) for c in self.get_children(): c.set_figure(fig)
@martist.Artist.axes.setter def axes(self, ax): # TODO deal with this better martist.Artist.axes.fset(self, ax) for c in self.get_children(): if c is not None: c.axes = ax
[docs] def contains(self, mouseevent): for c in self.get_children(): a, b = c.contains(mouseevent) if a: return a, b return False, {}
[docs] def set_offset(self, xy): """ Set the offset. Parameters ---------- xy : (float, float) or callable The (x,y) coordinates of the offset in display units. A callable must have the signature:: def offset(width, height, xdescent, ydescent, renderer) \ -> (float, float) """ self._offset = xy self.stale = True
[docs] def get_offset(self, width, height, xdescent, ydescent, renderer): """ Get the offset accepts extent of the box """ return (self._offset(width, height, xdescent, ydescent, renderer) if callable(self._offset) else self._offset)
[docs] def set_width(self, width): """ Set the width accepts float """ self.width = width self.stale = True
[docs] def set_height(self, height): """ Set the height accepts float """ self.height = height self.stale = True
[docs] def get_visible_children(self): """ Return a list of visible artists it contains. """ return [c for c in self._children if c.get_visible()]
[docs] def get_children(self): """ Return a list of artists it contains. """ return self._children
[docs] def get_extent_offsets(self, renderer): raise Exception("")
[docs] def get_extent(self, renderer): """ Return with, height, xdescent, ydescent of box """ w, h, xd, yd, offsets = self.get_extent_offsets(renderer) return w, h, xd, yd
[docs] def get_window_extent(self, renderer): ''' get the bounding box in display space. ''' w, h, xd, yd, offsets = self.get_extent_offsets(renderer) px, py = self.get_offset(w, h, xd, yd, renderer) return mtransforms.Bbox.from_bounds(px - xd, py - yd, w, h)
[docs] def draw(self, renderer): """ Update the location of children if necessary and draw them to the given *renderer*. """ width, height, xdescent, ydescent, offsets = self.get_extent_offsets( renderer) px, py = self.get_offset(width, height, xdescent, ydescent, renderer) for c, (ox, oy) in zip(self.get_visible_children(), offsets): c.set_offset((px + ox, py + oy)) c.draw(renderer) bbox_artist(self, renderer, fill=False, props=dict(pad=0.)) self.stale = False
[docs]class PackerBase(OffsetBox): def __init__(self, pad=None, sep=None, width=None, height=None, align=None, mode=None, children=None): """ Parameters ---------- pad : float, optional Boundary pad. sep : float, optional Spacing between items. width : float, optional height : float, optional Width and height of the container box, calculated if `None`. align : str, optional Alignment of boxes. Can be one of ``top``, ``bottom``, ``left``, ``right``, ``center`` and ``baseline`` mode : str, optional Packing mode. Notes ----- *pad* and *sep* need to given in points and will be scale with the renderer dpi, while *width* and *height* need to be in pixels. """ super().__init__() self.height = height self.width = width self.sep = sep self.pad = pad self.mode = mode self.align = align self._children = children
[docs]class VPacker(PackerBase): """ The VPacker has its children packed vertically. It automatically adjust the relative positions of children in the drawing time. """ def __init__(self, pad=None, sep=None, width=None, height=None, align="baseline", mode="fixed", children=None): """ Parameters ---------- pad : float, optional Boundary pad. sep : float, optional Spacing between items. width : float, optional height : float, optional width and height of the container box, calculated if `None`. align : str, optional Alignment of boxes. mode : str, optional Packing mode. Notes ----- *pad* and *sep* need to given in points and will be scale with the renderer dpi, while *width* and *height* need to be in pixels. """ super().__init__(pad, sep, width, height, align, mode, children)
[docs] def get_extent_offsets(self, renderer): """ update offset of childrens and return the extents of the box """ dpicor = renderer.points_to_pixels(1.) pad = self.pad * dpicor sep = self.sep * dpicor if self.width is not None: for c in self.get_visible_children(): if isinstance(c, PackerBase) and c.mode == "expand": c.set_width(self.width) whd_list = [c.get_extent(renderer) for c in self.get_visible_children()] whd_list = [(w, h, xd, (h - yd)) for w, h, xd, yd in whd_list] wd_list = [(w, xd) for w, h, xd, yd in whd_list] width, xdescent, xoffsets = _get_aligned_offsets(wd_list, self.width, self.align) pack_list = [(h, yd) for w, h, xd, yd in whd_list] height, yoffsets_ = _get_packed_offsets(pack_list, self.height, sep, self.mode) yoffsets = yoffsets_ + [yd for w, h, xd, yd in whd_list] ydescent = height - yoffsets[0] yoffsets = height - yoffsets yoffsets = yoffsets - ydescent return (width + 2 * pad, height + 2 * pad, xdescent + pad, ydescent + pad, list(zip(xoffsets, yoffsets)))
[docs]class HPacker(PackerBase): """ The HPacker has its children packed horizontally. It automatically adjusts the relative positions of children at draw time. """ def __init__(self, pad=None, sep=None, width=None, height=None, align="baseline", mode="fixed", children=None): """ Parameters ---------- pad : float, optional Boundary pad. sep : float, optional Spacing between items. width : float, optional height : float, optional Width and height of the container box, calculated if `None`. align : str Alignment of boxes. mode : str Packing mode. Notes ----- *pad* and *sep* need to given in points and will be scale with the renderer dpi, while *width* and *height* need to be in pixels. """ super().__init__(pad, sep, width, height, align, mode, children)
[docs] def get_extent_offsets(self, renderer): """ update offset of children and return the extents of the box """ dpicor = renderer.points_to_pixels(1.) pad = self.pad * dpicor sep = self.sep * dpicor whd_list = [c.get_extent(renderer) for c in self.get_visible_children()] if not whd_list: return 2 * pad, 2 * pad, pad, pad, [] if self.height is None: height_descent = max(h - yd for w, h, xd, yd in whd_list) ydescent = max(yd for w, h, xd, yd in whd_list) height = height_descent + ydescent else: height = self.height - 2 * pad # width w/o pad hd_list = [(h, yd) for w, h, xd, yd in whd_list] height, ydescent, yoffsets = _get_aligned_offsets(hd_list, self.height, self.align) pack_list = [(w, xd) for w, h, xd, yd in whd_list] width, xoffsets_ = _get_packed_offsets(pack_list, self.width, sep, self.mode) xoffsets = xoffsets_ + [xd for w, h, xd, yd in whd_list] xdescent = whd_list[0][2] xoffsets = xoffsets - xdescent return (width + 2 * pad, height + 2 * pad, xdescent + pad, ydescent + pad, list(zip(xoffsets, yoffsets)))
[docs]class PaddedBox(OffsetBox): def __init__(self, child, pad=None, draw_frame=False, patch_attrs=None): """ *pad* : boundary pad .. note:: *pad* need to given in points and will be scale with the renderer dpi, while *width* and *height* need to be in pixels. """ super().__init__() self.pad = pad self._children = [child] self.patch = FancyBboxPatch( xy=(0.0, 0.0), width=1., height=1., facecolor='w', edgecolor='k', mutation_scale=1, # self.prop.get_size_in_points(), snap=True ) self.patch.set_boxstyle("square", pad=0) if patch_attrs is not None: self.patch.update(patch_attrs) self._drawFrame = draw_frame
[docs] def get_extent_offsets(self, renderer): """ update offset of childrens and return the extents of the box """ dpicor = renderer.points_to_pixels(1.) pad = self.pad * dpicor w, h, xd, yd = self._children[0].get_extent(renderer) return w + 2 * pad, h + 2 * pad, \ xd + pad, yd + pad, \ [(0, 0)]
[docs] def draw(self, renderer): """ Update the location of children if necessary and draw them to the given *renderer*. """ width, height, xdescent, ydescent, offsets = self.get_extent_offsets( renderer) px, py = self.get_offset(width, height, xdescent, ydescent, renderer) for c, (ox, oy) in zip(self.get_visible_children(), offsets): c.set_offset((px + ox, py + oy)) self.draw_frame(renderer) for c in self.get_visible_children(): c.draw(renderer) #bbox_artist(self, renderer, fill=False, props=dict(pad=0.)) self.stale = False
[docs] def update_frame(self, bbox, fontsize=None): self.patch.set_bounds(bbox.x0, bbox.y0, bbox.width, bbox.height) if fontsize: self.patch.set_mutation_scale(fontsize) self.stale = True
[docs] def draw_frame(self, renderer): # update the location and size of the legend bbox = self.get_window_extent(renderer) self.update_frame(bbox) if self._drawFrame: self.patch.draw(renderer)
[docs]class DrawingArea(OffsetBox): """ The DrawingArea can contain any Artist as a child. The DrawingArea has a fixed width and height. The position of children relative to the parent is fixed. The children can be clipped at the boundaries of the parent. """ def __init__(self, width, height, xdescent=0., ydescent=0., clip=False): """ *width*, *height* : width and height of the container box. *xdescent*, *ydescent* : descent of the box in x- and y-direction. *clip* : Whether to clip the children """ super().__init__() self.width = width self.height = height self.xdescent = xdescent self.ydescent = ydescent self._clip_children = clip self.offset_transform = mtransforms.Affine2D() self.offset_transform.clear() self.offset_transform.translate(0, 0) self.dpi_transform = mtransforms.Affine2D() @property def clip_children(self): """ If the children of this DrawingArea should be clipped by DrawingArea bounding box. """ return self._clip_children @clip_children.setter def clip_children(self, val): self._clip_children = bool(val) self.stale = True
[docs] def get_transform(self): """ Return the :class:`~matplotlib.transforms.Transform` applied to the children """ return self.dpi_transform + self.offset_transform
[docs] def set_transform(self, t): """ set_transform is ignored. """ pass
[docs] def set_offset(self, xy): """ Set the offset of the container. Parameters ---------- xy : (float, float) The (x,y) coordinates of the offset in display units. """ self._offset = xy self.offset_transform.clear() self.offset_transform.translate(xy[0], xy[1]) self.stale = True
[docs] def get_offset(self): """ return offset of the container. """ return self._offset
[docs] def get_window_extent(self, renderer): ''' get the bounding box in display space. ''' w, h, xd, yd = self.get_extent(renderer) ox, oy = self.get_offset() # w, h, xd, yd) return mtransforms.Bbox.from_bounds(ox - xd, oy - yd, w, h)
[docs] def get_extent(self, renderer): """ Return with, height, xdescent, ydescent of box """ dpi_cor = renderer.points_to_pixels(1.) return self.width * dpi_cor, self.height * dpi_cor, \ self.xdescent * dpi_cor, self.ydescent * dpi_cor
[docs] def add_artist(self, a): 'Add any :class:`~matplotlib.artist.Artist` to the container box' self._children.append(a) if not a.is_transform_set(): a.set_transform(self.get_transform()) if self.axes is not None: a.axes = self.axes fig = self.figure if fig is not None: a.set_figure(fig)
[docs] def draw(self, renderer): """ Draw the children """ dpi_cor = renderer.points_to_pixels(1.) self.dpi_transform.clear() self.dpi_transform.scale(dpi_cor, dpi_cor) # At this point the DrawingArea has a transform # to the display space so the path created is # good for clipping children tpath = mtransforms.TransformedPath( mpath.Path([[0, 0], [0, self.height], [self.width, self.height], [self.width, 0]]), self.get_transform()) for c in self._children: if self._clip_children and not (c.clipbox or c._clippath): c.set_clip_path(tpath) c.draw(renderer) bbox_artist(self, renderer, fill=False, props=dict(pad=0.)) self.stale = False
[docs]class TextArea(OffsetBox): """ The TextArea is contains a single Text instance. The text is placed at (0,0) with baseline+left alignment. The width and height of the TextArea instance is the width and height of the its child text. """ def __init__(self, s, textprops=None, multilinebaseline=None, minimumdescent=True, ): """ Parameters ---------- s : str a string to be displayed. textprops : `~matplotlib.font_manager.FontProperties`, optional multilinebaseline : bool, optional If `True`, baseline for multiline text is adjusted so that it is (approximatedly) center-aligned with singleline text. minimumdescent : bool, optional If `True`, the box has a minimum descent of "p". """ if textprops is None: textprops = {} if "va" not in textprops: textprops["va"] = "baseline" self._text = mtext.Text(0, 0, s, **textprops) OffsetBox.__init__(self) self._children = [self._text] self.offset_transform = mtransforms.Affine2D() self.offset_transform.clear() self.offset_transform.translate(0, 0) self._baseline_transform = mtransforms.Affine2D() self._text.set_transform(self.offset_transform + self._baseline_transform) self._multilinebaseline = multilinebaseline self._minimumdescent = minimumdescent
[docs] def set_text(self, s): "Set the text of this area as a string." self._text.set_text(s) self.stale = True
[docs] def get_text(self): "Returns the string representation of this area's text" return self._text.get_text()
[docs] def set_multilinebaseline(self, t): """ Set multilinebaseline . If True, baseline for multiline text is adjusted so that it is (approximatedly) center-aligned with singleline text. """ self._multilinebaseline = t self.stale = True
[docs] def get_multilinebaseline(self): """ get multilinebaseline . """ return self._multilinebaseline
[docs] def set_minimumdescent(self, t): """ Set minimumdescent . If True, extent of the single line text is adjusted so that it has minimum descent of "p" """ self._minimumdescent = t self.stale = True
[docs] def get_minimumdescent(self): """ get minimumdescent. """ return self._minimumdescent
[docs] def set_transform(self, t): """ set_transform is ignored. """ pass
[docs] def set_offset(self, xy): """ Set the offset of the container. Parameters ---------- xy : (float, float) The (x,y) coordinates of the offset in display units. """ self._offset = xy self.offset_transform.clear() self.offset_transform.translate(xy[0], xy[1]) self.stale = True
[docs] def get_offset(self): """ return offset of the container. """ return self._offset
[docs] def get_window_extent(self, renderer): ''' get the bounding box in display space. ''' w, h, xd, yd = self.get_extent(renderer) ox, oy = self.get_offset() # w, h, xd, yd) return mtransforms.Bbox.from_bounds(ox - xd, oy - yd, w, h)
[docs] def get_extent(self, renderer): clean_line, ismath = self._text.is_math_text(self._text._text) _, h_, d_ = renderer.get_text_width_height_descent( "lp", self._text._fontproperties, ismath=False) bbox, info, d = self._text._get_layout(renderer) w, h = bbox.width, bbox.height line = info[-1][0] # last line self._baseline_transform.clear() if len(info) > 1 and self._multilinebaseline: d_new = 0.5 * h - 0.5 * (h_ - d_) self._baseline_transform.translate(0, d - d_new) d = d_new else: # single line h_d = max(h_ - d_, h - d) if self.get_minimumdescent(): ## to have a minimum descent, #i.e., "l" and "p" have same ## descents. d = max(d, d_) #else: # d = d h = h_d + d return w, h, 0., d
[docs] def draw(self, renderer): """ Draw the children """ self._text.draw(renderer) bbox_artist(self, renderer, fill=False, props=dict(pad=0.)) self.stale = False
[docs]class AuxTransformBox(OffsetBox): """ Offset Box with the aux_transform. Its children will be transformed with the aux_transform first then will be offseted. The absolute coordinate of the aux_transform is meaning as it will be automatically adjust so that the left-lower corner of the bounding box of children will be set to (0,0) before the offset transform. It is similar to drawing area, except that the extent of the box is not predetermined but calculated from the window extent of its children. Furthermore, the extent of the children will be calculated in the transformed coordinate. """ def __init__(self, aux_transform): self.aux_transform = aux_transform OffsetBox.__init__(self) self.offset_transform = mtransforms.Affine2D() self.offset_transform.clear() self.offset_transform.translate(0, 0) # ref_offset_transform is used to make the offset_transform is # always reference to the lower-left corner of the bbox of its # children. self.ref_offset_transform = mtransforms.Affine2D() self.ref_offset_transform.clear()
[docs] def add_artist(self, a): 'Add any :class:`~matplotlib.artist.Artist` to the container box' self._children.append(a) a.set_transform(self.get_transform()) self.stale = True
[docs] def get_transform(self): """ Return the :class:`~matplotlib.transforms.Transform` applied to the children """ return self.aux_transform + \ self.ref_offset_transform + \ self.offset_transform
[docs] def set_transform(self, t): """ set_transform is ignored. """ pass
[docs] def set_offset(self, xy): """ Set the offset of the container. Parameters ---------- xy : (float, float) The (x,y) coordinates of the offset in display units. """ self._offset = xy self.offset_transform.clear() self.offset_transform.translate(xy[0], xy[1]) self.stale = True
[docs] def get_offset(self): """ return offset of the container. """ return self._offset
[docs] def get_window_extent(self, renderer): ''' get the bounding box in display space. ''' w, h, xd, yd = self.get_extent(renderer) ox, oy = self.get_offset() # w, h, xd, yd) return mtransforms.Bbox.from_bounds(ox - xd, oy - yd, w, h)
[docs] def get_extent(self, renderer): # clear the offset transforms _off = self.offset_transform.to_values() # to be restored later self.ref_offset_transform.clear() self.offset_transform.clear() # calculate the extent bboxes = [c.get_window_extent(renderer) for c in self._children] ub = mtransforms.Bbox.union(bboxes) # adjust ref_offset_tansform self.ref_offset_transform.translate(-ub.x0, -ub.y0) # restor offset transform mtx = self.offset_transform.matrix_from_values(*_off) self.offset_transform.set_matrix(mtx) return ub.width, ub.height, 0., 0.
[docs] def draw(self, renderer): """ Draw the children """ for c in self._children: c.draw(renderer) bbox_artist(self, renderer, fill=False, props=dict(pad=0.)) self.stale = False
[docs]class AnchoredOffsetbox(OffsetBox): """ An offset box placed according to the legend location loc. AnchoredOffsetbox has a single child. When multiple children is needed, use other OffsetBox class to enclose them. By default, the offset box is anchored against its parent axes. You may explicitly specify the bbox_to_anchor. """ zorder = 5 # zorder of the legend # Location codes codes = {'upper right': 1, 'upper left': 2, 'lower left': 3, 'lower right': 4, 'right': 5, 'center left': 6, 'center right': 7, 'lower center': 8, 'upper center': 9, 'center': 10, } def __init__(self, loc, pad=0.4, borderpad=0.5, child=None, prop=None, frameon=True, bbox_to_anchor=None, bbox_transform=None, **kwargs): """ loc is a string or an integer specifying the legend location. The valid location codes are:: 'upper right' : 1, 'upper left' : 2, 'lower left' : 3, 'lower right' : 4, 'right' : 5, (same as 'center right', for back-compatibility) 'center left' : 6, 'center right' : 7, 'lower center' : 8, 'upper center' : 9, 'center' : 10, pad : pad around the child for drawing a frame. given in fraction of fontsize. borderpad : pad between offsetbox frame and the bbox_to_anchor, child : OffsetBox instance that will be anchored. prop : font property. This is only used as a reference for paddings. frameon : draw a frame box if True. bbox_to_anchor : bbox to anchor. Use self.axes.bbox if None. bbox_transform : with which the bbox_to_anchor will be transformed. """ super().__init__(**kwargs) self.set_bbox_to_anchor(bbox_to_anchor, bbox_transform) self.set_child(child) if isinstance(loc, str): try: loc = self.codes[loc] except KeyError: raise ValueError('Unrecognized location "%s". Valid ' 'locations are\n\t%s\n' % (loc, '\n\t'.join(self.codes))) self.loc = loc self.borderpad = borderpad self.pad = pad if prop is None: self.prop = FontProperties(size=rcParams["legend.fontsize"]) elif isinstance(prop, dict): self.prop = FontProperties(**prop) if "size" not in prop: self.prop.set_size(rcParams["legend.fontsize"]) else: self.prop = prop self.patch = FancyBboxPatch( xy=(0.0, 0.0), width=1., height=1., facecolor='w', edgecolor='k', mutation_scale=self.prop.get_size_in_points(), snap=True ) self.patch.set_boxstyle("square", pad=0) self._drawFrame = frameon
[docs] def set_child(self, child): "set the child to be anchored" self._child = child if child is not None: child.axes = self.axes self.stale = True
[docs] def get_child(self): "return the child" return self._child
[docs] def get_children(self): "return the list of children" return [self._child]
[docs] def get_extent(self, renderer): """ return the extent of the artist. The extent of the child added with the pad is returned """ w, h, xd, yd = self.get_child().get_extent(renderer) fontsize = renderer.points_to_pixels(self.prop.get_size_in_points()) pad = self.pad * fontsize return w + 2 * pad, h + 2 * pad, xd + pad, yd + pad
[docs] def get_bbox_to_anchor(self): """ return the bbox that the legend will be anchored """ if self._bbox_to_anchor is None: return self.axes.bbox else: transform = self._bbox_to_anchor_transform if transform is None: return self._bbox_to_anchor else: return TransformedBbox(self._bbox_to_anchor, transform)
[docs] def set_bbox_to_anchor(self, bbox, transform=None): """ set the bbox that the child will be anchored. *bbox* can be a Bbox instance, a list of [left, bottom, width, height], or a list of [left, bottom] where the width and height will be assumed to be zero. The bbox will be transformed to display coordinate by the given transform. """ if bbox is None or isinstance(bbox, BboxBase): self._bbox_to_anchor = bbox else: try: l = len(bbox) except TypeError: raise ValueError("Invalid argument for bbox : %s" % str(bbox)) if l == 2: bbox = [bbox[0], bbox[1], 0, 0] self._bbox_to_anchor = Bbox.from_bounds(*bbox) self._bbox_to_anchor_transform = transform self.stale = True
[docs] def get_window_extent(self, renderer): ''' get the bounding box in display space. ''' self._update_offset_func(renderer) w, h, xd, yd = self.get_extent(renderer) ox, oy = self.get_offset(w, h, xd, yd, renderer) return Bbox.from_bounds(ox - xd, oy - yd, w, h)
def _update_offset_func(self, renderer, fontsize=None): """ Update the offset func which depends on the dpi of the renderer (because of the padding). """ if fontsize is None: fontsize = renderer.points_to_pixels( self.prop.get_size_in_points()) def _offset(w, h, xd, yd, renderer, fontsize=fontsize, self=self): bbox = Bbox.from_bounds(0, 0, w, h) borderpad = self.borderpad * fontsize bbox_to_anchor = self.get_bbox_to_anchor() x0, y0 = self._get_anchored_bbox(self.loc, bbox, bbox_to_anchor, borderpad) return x0 + xd, y0 + yd self.set_offset(_offset)
[docs] def update_frame(self, bbox, fontsize=None): self.patch.set_bounds(bbox.x0, bbox.y0, bbox.width, bbox.height) if fontsize: self.patch.set_mutation_scale(fontsize)
[docs] def draw(self, renderer): "draw the artist" if not self.get_visible(): return fontsize = renderer.points_to_pixels(self.prop.get_size_in_points()) self._update_offset_func(renderer, fontsize) if self._drawFrame: # update the location and size of the legend bbox = self.get_window_extent(renderer) self.update_frame(bbox, fontsize) self.patch.draw(renderer) width, height, xdescent, ydescent = self.get_extent(renderer) px, py = self.get_offset(width, height, xdescent, ydescent, renderer) self.get_child().set_offset((px, py)) self.get_child().draw(renderer) self.stale = False
def _get_anchored_bbox(self, loc, bbox, parentbbox, borderpad): """ return the position of the bbox anchored at the parentbbox with the loc code, with the borderpad. """ assert loc in range(1, 11) # called only internally BEST, UR, UL, LL, LR, R, CL, CR, LC, UC, C = range(11) anchor_coefs = {UR: "NE", UL: "NW", LL: "SW", LR: "SE", R: "E", CL: "W", CR: "E", LC: "S", UC: "N", C: "C"} c = anchor_coefs[loc] container = parentbbox.padded(-borderpad) anchored_box = bbox.anchored(c, container=container) return anchored_box.x0, anchored_box.y0
[docs]class AnchoredText(AnchoredOffsetbox): """ AnchoredOffsetbox with Text. """ def __init__(self, s, loc, pad=0.4, borderpad=0.5, prop=None, **kwargs): """ Parameters ---------- s : string Text. loc : str Location code. pad : float, optional Pad between the text and the frame as fraction of the font size. borderpad : float, optional Pad between the frame and the axes (or *bbox_to_anchor*). prop : dictionary, optional, default: None Dictionary of keyword parameters to be passed to the `~matplotlib.text.Text` instance contained inside AnchoredText. Notes ----- Other keyword parameters of `AnchoredOffsetbox` are also allowed. """ if prop is None: prop = {} badkwargs = {'ha', 'horizontalalignment', 'va', 'verticalalignment'} if badkwargs & set(prop): warnings.warn("Mixing horizontalalignment or verticalalignment " "with AnchoredText is not supported.") self.txt = TextArea(s, textprops=prop, minimumdescent=False) fp = self.txt._text.get_fontproperties() super().__init__( loc, pad=pad, borderpad=borderpad, child=self.txt, prop=fp, **kwargs)
[docs]class OffsetImage(OffsetBox): def __init__(self, arr, zoom=1, cmap=None, norm=None, interpolation=None, origin=None, filternorm=1, filterrad=4.0, resample=False, dpi_cor=True, **kwargs ): OffsetBox.__init__(self) self._dpi_cor = dpi_cor self.image = BboxImage(bbox=self.get_window_extent, cmap=cmap, norm=norm, interpolation=interpolation, origin=origin, filternorm=filternorm, filterrad=filterrad, resample=resample, **kwargs ) self._children = [self.image] self.set_zoom(zoom) self.set_data(arr)
[docs] def set_data(self, arr): self._data = np.asarray(arr) self.image.set_data(self._data) self.stale = True
[docs] def get_data(self): return self._data
[docs] def set_zoom(self, zoom): self._zoom = zoom self.stale = True
[docs] def get_zoom(self): return self._zoom
# def set_axes(self, axes): # self.image.set_axes(axes) # martist.Artist.set_axes(self, axes) # def set_offset(self, xy): # """ # Set the offset of the container. # # Parameters # ---------- # xy : (float, float) # The (x,y) coordinates of the offset in display units. # """ # self._offset = xy # self.offset_transform.clear() # self.offset_transform.translate(xy[0], xy[1])
[docs] def get_offset(self): """ return offset of the container. """ return self._offset
[docs] def get_children(self): return [self.image]
[docs] def get_window_extent(self, renderer): ''' get the bounding box in display space. ''' w, h, xd, yd = self.get_extent(renderer) ox, oy = self.get_offset() return mtransforms.Bbox.from_bounds(ox - xd, oy - yd, w, h)
[docs] def get_extent(self, renderer): if self._dpi_cor: # True, do correction dpi_cor = renderer.points_to_pixels(1.) else: dpi_cor = 1. zoom = self.get_zoom() data = self.get_data() ny, nx = data.shape[:2] w, h = dpi_cor * nx * zoom, dpi_cor * ny * zoom return w, h, 0, 0
[docs] def draw(self, renderer): """ Draw the children """ self.image.draw(renderer) # bbox_artist(self, renderer, fill=False, props=dict(pad=0.)) self.stale = False
[docs]class AnnotationBbox(martist.Artist, _AnnotationBase): """ Annotation-like class, but with offsetbox instead of Text. """ zorder = 3 def __str__(self): return "AnnotationBbox(%g,%g)" % (self.xy[0], self.xy[1]) @docstring.dedent_interpd def __init__(self, offsetbox, xy, xybox=None, xycoords='data', boxcoords=None, frameon=True, pad=0.4, # BboxPatch annotation_clip=None, box_alignment=(0.5, 0.5), bboxprops=None, arrowprops=None, fontsize=None, **kwargs): """ *offsetbox* : OffsetBox instance *xycoords* : same as Annotation but can be a tuple of two strings which are interpreted as x and y coordinates. *boxcoords* : similar to textcoords as Annotation but can be a tuple of two strings which are interpreted as x and y coordinates. *box_alignment* : a tuple of two floats for a vertical and horizontal alignment of the offset box w.r.t. the *boxcoords*. The lower-left corner is (0.0) and upper-right corner is (1.1). other parameters are identical to that of Annotation. """ martist.Artist.__init__(self, **kwargs) _AnnotationBase.__init__(self, xy, xycoords=xycoords, annotation_clip=annotation_clip) self.offsetbox = offsetbox self.arrowprops = arrowprops self.set_fontsize(fontsize) if xybox is None: self.xybox = xy else: self.xybox = xybox if boxcoords is None: self.boxcoords = xycoords else: self.boxcoords = boxcoords if arrowprops is not None: self._arrow_relpos = self.arrowprops.pop("relpos", (0.5, 0.5)) self.arrow_patch = FancyArrowPatch((0, 0), (1, 1), **self.arrowprops) else: self._arrow_relpos = None self.arrow_patch = None #self._fw, self._fh = 0., 0. # for alignment self._box_alignment = box_alignment # frame self.patch = FancyBboxPatch( xy=(0.0, 0.0), width=1., height=1., facecolor='w', edgecolor='k', mutation_scale=self.prop.get_size_in_points(), snap=True ) self.patch.set_boxstyle("square", pad=pad) if bboxprops: self.patch.set(**bboxprops) self._drawFrame = frameon @property def xyann(self): return self.xybox @xyann.setter def xyann(self, xyann): self.xybox = xyann self.stale = True @property def anncoords(self): return self.boxcoords @anncoords.setter def anncoords(self, coords): self.boxcoords = coords self.stale = True
[docs] def contains(self, event): t, tinfo = self.offsetbox.contains(event) #if self.arrow_patch is not None: # a,ainfo=self.arrow_patch.contains(event) # t = t or a # self.arrow_patch is currently not checked as this can be a line - JJ return t, tinfo
[docs] def get_children(self): children = [self.offsetbox, self.patch] if self.arrow_patch: children.append(self.arrow_patch) return children
[docs] def set_figure(self, fig): if self.arrow_patch is not None: self.arrow_patch.set_figure(fig) self.offsetbox.set_figure(fig) martist.Artist.set_figure(self, fig)
[docs] def set_fontsize(self, s=None): """ set fontsize in points """ if s is None: s = rcParams["legend.fontsize"] self.prop = FontProperties(size=s) self.stale = True
[docs] def get_fontsize(self, s=None): """ return fontsize in points """ return self.prop.get_size_in_points()
[docs] def update_positions(self, renderer): """ Update the pixel positions of the annotated point and the text. """ xy_pixel = self._get_position_xy(renderer) self._update_position_xybox(renderer, xy_pixel) mutation_scale = renderer.points_to_pixels(self.get_fontsize()) self.patch.set_mutation_scale(mutation_scale) if self.arrow_patch: self.arrow_patch.set_mutation_scale(mutation_scale)
def _update_position_xybox(self, renderer, xy_pixel): """ Update the pixel positions of the annotation text and the arrow patch. """ x, y = self.xybox if isinstance(self.boxcoords, tuple): xcoord, ycoord = self.boxcoords x1, y1 = self._get_xy(renderer, x, y, xcoord) x2, y2 = self._get_xy(renderer, x, y, ycoord) ox0, oy0 = x1, y2 else: ox0, oy0 = self._get_xy(renderer, x, y, self.boxcoords) w, h, xd, yd = self.offsetbox.get_extent(renderer) _fw, _fh = self._box_alignment self.offsetbox.set_offset((ox0 - _fw * w + xd, oy0 - _fh * h + yd)) # update patch position bbox = self.offsetbox.get_window_extent(renderer) #self.offsetbox.set_offset((ox0-_fw*w, oy0-_fh*h)) self.patch.set_bounds(bbox.x0, bbox.y0, bbox.width, bbox.height) x, y = xy_pixel ox1, oy1 = x, y if self.arrowprops: x0, y0 = x, y d = self.arrowprops.copy() # Use FancyArrowPatch if self.arrowprops has "arrowstyle" key. # adjust the starting point of the arrow relative to # the textbox. # TODO : Rotation needs to be accounted. relpos = self._arrow_relpos ox0 = bbox.x0 + bbox.width * relpos[0] oy0 = bbox.y0 + bbox.height * relpos[1] # The arrow will be drawn from (ox0, oy0) to (ox1, # oy1). It will be first clipped by patchA and patchB. # Then it will be shrunk by shrinkA and shrinkB # (in points). If patch A is not set, self.bbox_patch # is used. self.arrow_patch.set_positions((ox0, oy0), (ox1, oy1)) fs = self.prop.get_size_in_points() mutation_scale = d.pop("mutation_scale", fs) mutation_scale = renderer.points_to_pixels(mutation_scale) self.arrow_patch.set_mutation_scale(mutation_scale) patchA = d.pop("patchA", self.patch) self.arrow_patch.set_patchA(patchA)
[docs] def draw(self, renderer): """ 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_positions(renderer) if self.arrow_patch is not None: if self.arrow_patch.figure is None and self.figure is not None: self.arrow_patch.figure = self.figure self.arrow_patch.draw(renderer) if self._drawFrame: self.patch.draw(renderer) self.offsetbox.draw(renderer) self.stale = False
[docs]class DraggableBase(object): """ helper code for a draggable artist (legend, offsetbox) The derived class must override following two method. def save_offset(self): pass def update_offset(self, dx, dy): pass *save_offset* is called when the object is picked for dragging and it is meant to save reference position of the artist. *update_offset* is called during the dragging. dx and dy is the pixel offset from the point where the mouse drag started. Optionally you may override following two methods. def artist_picker(self, artist, evt): return self.ref_artist.contains(evt) def finalize_offset(self): pass *artist_picker* is a picker method that will be used. *finalize_offset* is called when the mouse is released. In current implementation of DraggableLegend and DraggableAnnotation, *update_offset* places the artists simply in display coordinates. And *finalize_offset* recalculate their position in the normalized axes coordinate and set a relavant attribute. """ def __init__(self, ref_artist, use_blit=False): self.ref_artist = ref_artist self.got_artist = False self.canvas = self.ref_artist.figure.canvas self._use_blit = use_blit and self.canvas.supports_blit c2 = self.canvas.mpl_connect('pick_event', self.on_pick) c3 = self.canvas.mpl_connect('button_release_event', self.on_release) ref_artist.set_picker(self.artist_picker) self.cids = [c2, c3]
[docs] def on_motion(self, evt): if self._check_still_parented() and self.got_artist: dx = evt.x - self.mouse_x dy = evt.y - self.mouse_y self.update_offset(dx, dy) self.canvas.draw()
[docs] def on_motion_blit(self, evt): if self._check_still_parented() and self.got_artist: dx = evt.x - self.mouse_x dy = evt.y - self.mouse_y self.update_offset(dx, dy) self.canvas.restore_region(self.background) self.ref_artist.draw(self.ref_artist.figure._cachedRenderer) self.canvas.blit(self.ref_artist.figure.bbox)
[docs] def on_pick(self, evt): if self._check_still_parented() and evt.artist == self.ref_artist: self.mouse_x = evt.mouseevent.x self.mouse_y = evt.mouseevent.y self.got_artist = True if self._use_blit: self.ref_artist.set_animated(True) self.canvas.draw() self.background = self.canvas.copy_from_bbox( self.ref_artist.figure.bbox) self.ref_artist.draw(self.ref_artist.figure._cachedRenderer) self.canvas.blit(self.ref_artist.figure.bbox) self._c1 = self.canvas.mpl_connect('motion_notify_event', self.on_motion_blit) else: self._c1 = self.canvas.mpl_connect('motion_notify_event', self.on_motion) self.save_offset()
[docs] def on_release(self, event): if self._check_still_parented() and self.got_artist: self.finalize_offset() self.got_artist = False self.canvas.mpl_disconnect(self._c1) if self._use_blit: self.ref_artist.set_animated(False)
def _check_still_parented(self): if self.ref_artist.figure is None: self.disconnect() return False else: return True
[docs] def disconnect(self): """disconnect the callbacks""" for cid in self.cids: self.canvas.mpl_disconnect(cid) try: c1 = self._c1 except AttributeError: pass else: self.canvas.mpl_disconnect(c1)
[docs] def artist_picker(self, artist, evt): return self.ref_artist.contains(evt)
[docs] def save_offset(self): pass
[docs] def update_offset(self, dx, dy): pass
[docs] def finalize_offset(self): pass
[docs]class DraggableOffsetBox(DraggableBase): def __init__(self, ref_artist, offsetbox, use_blit=False): DraggableBase.__init__(self, ref_artist, use_blit=use_blit) self.offsetbox = offsetbox
[docs] def save_offset(self): offsetbox = self.offsetbox renderer = offsetbox.figure._cachedRenderer w, h, xd, yd = offsetbox.get_extent(renderer) offset = offsetbox.get_offset(w, h, xd, yd, renderer) self.offsetbox_x, self.offsetbox_y = offset self.offsetbox.set_offset(offset)
[docs] def update_offset(self, dx, dy): loc_in_canvas = self.offsetbox_x + dx, self.offsetbox_y + dy self.offsetbox.set_offset(loc_in_canvas)
[docs] def get_loc_in_canvas(self): offsetbox = self.offsetbox renderer = offsetbox.figure._cachedRenderer w, h, xd, yd = offsetbox.get_extent(renderer) ox, oy = offsetbox._offset loc_in_canvas = (ox - xd, oy - yd) return loc_in_canvas
[docs]class DraggableAnnotation(DraggableBase): def __init__(self, annotation, use_blit=False): DraggableBase.__init__(self, annotation, use_blit=use_blit) self.annotation = annotation
[docs] def save_offset(self): ann = self.annotation self.ox, self.oy = ann.get_transform().transform(ann.xyann)
[docs] def update_offset(self, dx, dy): ann = self.annotation ann.xyann = ann.get_transform().inverted().transform( (self.ox + dx, self.oy + dy))
if __name__ == "__main__": import matplotlib.pyplot as plt fig = plt.figure(1) fig.clf() ax = plt.subplot(121) #txt = ax.text(0.5, 0.5, "Test", size=30, ha="center", color="w") kwargs = dict() a = np.arange(256).reshape(16, 16) / 256. myimage = OffsetImage(a, zoom=2, norm=None, origin=None, **kwargs ) ax.add_artist(myimage) myimage.set_offset((100, 100)) myimage2 = OffsetImage(a, zoom=2, norm=None, origin=None, **kwargs ) ann = AnnotationBbox(myimage2, (0.5, 0.5), xybox=(30, 30), xycoords='data', boxcoords="offset points", frameon=True, pad=0.4, # BboxPatch bboxprops=dict(boxstyle="round", fc="y"), fontsize=None, arrowprops=dict(arrowstyle="->"), ) ax.add_artist(ann) plt.draw() plt.show()