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"""
Provides classes of simple units that will be used with `.AxesDivider`
class (or others) to determine the size of each Axes. The unit
classes define `get_size` method that returns a tuple of two floats,
meaning relative and absolute sizes, respectively.
Note that this class is nothing more than a simple tuple of two
floats. Take a look at the Divider class to see how these two
values are used.
"""
from numbers import Real
from matplotlib import _api
from matplotlib.axes import Axes
class _Base:
def __rmul__(self, other):
return Fraction(other, self)
def __add__(self, other):
if isinstance(other, _Base):
return Add(self, other)
else:
return Add(self, Fixed(other))
def get_size(self, renderer):
"""
Return two-float tuple with relative and absolute sizes.
"""
raise NotImplementedError("Subclasses must implement")
class Add(_Base):
"""
Sum of two sizes.
"""
def __init__(self, a, b):
self._a = a
self._b = b
def get_size(self, renderer):
a_rel_size, a_abs_size = self._a.get_size(renderer)
b_rel_size, b_abs_size = self._b.get_size(renderer)
return a_rel_size + b_rel_size, a_abs_size + b_abs_size
class Fixed(_Base):
"""
Simple fixed size with absolute part = *fixed_size* and relative part = 0.
"""
def __init__(self, fixed_size):
_api.check_isinstance(Real, fixed_size=fixed_size)
self.fixed_size = fixed_size
def get_size(self, renderer):
rel_size = 0.
abs_size = self.fixed_size
return rel_size, abs_size
class Scaled(_Base):
"""
Simple scaled(?) size with absolute part = 0 and
relative part = *scalable_size*.
"""
def __init__(self, scalable_size):
self._scalable_size = scalable_size
def get_size(self, renderer):
rel_size = self._scalable_size
abs_size = 0.
return rel_size, abs_size
Scalable = Scaled
def _get_axes_aspect(ax):
aspect = ax.get_aspect()
if aspect == "auto":
aspect = 1.
return aspect
class AxesX(_Base):
"""
Scaled size whose relative part corresponds to the data width
of the *axes* multiplied by the *aspect*.
"""
def __init__(self, axes, aspect=1., ref_ax=None):
self._axes = axes
self._aspect = aspect
if aspect == "axes" and ref_ax is None:
raise ValueError("ref_ax must be set when aspect='axes'")
self._ref_ax = ref_ax
def get_size(self, renderer):
l1, l2 = self._axes.get_xlim()
if self._aspect == "axes":
ref_aspect = _get_axes_aspect(self._ref_ax)
aspect = ref_aspect / _get_axes_aspect(self._axes)
else:
aspect = self._aspect
rel_size = abs(l2-l1)*aspect
abs_size = 0.
return rel_size, abs_size
class AxesY(_Base):
"""
Scaled size whose relative part corresponds to the data height
of the *axes* multiplied by the *aspect*.
"""
def __init__(self, axes, aspect=1., ref_ax=None):
self._axes = axes
self._aspect = aspect
if aspect == "axes" and ref_ax is None:
raise ValueError("ref_ax must be set when aspect='axes'")
self._ref_ax = ref_ax
def get_size(self, renderer):
l1, l2 = self._axes.get_ylim()
if self._aspect == "axes":
ref_aspect = _get_axes_aspect(self._ref_ax)
aspect = _get_axes_aspect(self._axes)
else:
aspect = self._aspect
rel_size = abs(l2-l1)*aspect
abs_size = 0.
return rel_size, abs_size
class MaxExtent(_Base):
"""
Size whose absolute part is either the largest width or the largest height
of the given *artist_list*.
"""
def __init__(self, artist_list, w_or_h):
self._artist_list = artist_list
_api.check_in_list(["width", "height"], w_or_h=w_or_h)
self._w_or_h = w_or_h
def add_artist(self, a):
self._artist_list.append(a)
def get_size(self, renderer):
rel_size = 0.
extent_list = [
getattr(a.get_window_extent(renderer), self._w_or_h) / a.figure.dpi
for a in self._artist_list]
abs_size = max(extent_list, default=0)
return rel_size, abs_size
class MaxWidth(MaxExtent):
"""
Size whose absolute part is the largest width of the given *artist_list*.
"""
def __init__(self, artist_list):
super().__init__(artist_list, "width")
class MaxHeight(MaxExtent):
"""
Size whose absolute part is the largest height of the given *artist_list*.
"""
def __init__(self, artist_list):
super().__init__(artist_list, "height")
class Fraction(_Base):
"""
An instance whose size is a *fraction* of the *ref_size*.
>>> s = Fraction(0.3, AxesX(ax))
"""
def __init__(self, fraction, ref_size):
_api.check_isinstance(Real, fraction=fraction)
self._fraction_ref = ref_size
self._fraction = fraction
def get_size(self, renderer):
if self._fraction_ref is None:
return self._fraction, 0.
else:
r, a = self._fraction_ref.get_size(renderer)
rel_size = r*self._fraction
abs_size = a*self._fraction
return rel_size, abs_size
def from_any(size, fraction_ref=None):
"""
Create a Fixed unit when the first argument is a float, or a
Fraction unit if that is a string that ends with %. The second
argument is only meaningful when Fraction unit is created.
>>> from mpl_toolkits.axes_grid1.axes_size import from_any
>>> a = from_any(1.2) # => Fixed(1.2)
>>> from_any("50%", a) # => Fraction(0.5, a)
"""
if isinstance(size, Real):
return Fixed(size)
elif isinstance(size, str):
if size[-1] == "%":
return Fraction(float(size[:-1]) / 100, fraction_ref)
raise ValueError("Unknown format")
class _AxesDecorationsSize(_Base):
"""
Fixed size, corresponding to the size of decorations on a given Axes side.
"""
_get_size_map = {
"left": lambda tight_bb, axes_bb: axes_bb.xmin - tight_bb.xmin,
"right": lambda tight_bb, axes_bb: tight_bb.xmax - axes_bb.xmax,
"bottom": lambda tight_bb, axes_bb: axes_bb.ymin - tight_bb.ymin,
"top": lambda tight_bb, axes_bb: tight_bb.ymax - axes_bb.ymax,
}
def __init__(self, ax, direction):
self._get_size = _api.check_getitem(
self._get_size_map, direction=direction)
self._ax_list = [ax] if isinstance(ax, Axes) else ax
def get_size(self, renderer):
sz = max([
self._get_size(ax.get_tightbbox(renderer, call_axes_locator=False),
ax.bbox)
for ax in self._ax_list])
dpi = renderer.points_to_pixels(72)
abs_size = sz / dpi
rel_size = 0
return rel_size, abs_size
|
