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Equal area markers#16891

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14 changes: 7 additions & 7 deletionsdoc/api/next_api_changes/deprecations.rst
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Expand Up@@ -374,13 +374,13 @@ also be accessible as ``toolbar.parent()``.

Path helpers in :mod:`.bezier`
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

``bezier.make_path_regular`` is deprecated. Use``Path.cleaned()`` (or
``Path.cleaned(curves=True)``, etc.) instead (but note that these methods add a
``STOP``code at the end of the path).

``bezier.concatenate_paths``is deprecated. Use``Path.make_compound_path()``
instead.
- ``bezier.make_path_regular`` is deprecated. Use ``Path.cleaned()`` (or
``Path.cleaned(curves=True)``, etc.) instead (but note that these methods add
a ``STOP`` code at the end of the path).
- ``bezier.concatenate_paths``is deprecated. Use ``Path.make_compound_path()``
instead.
-``bezier.split_path_inout``(use``Path.split_path_inout`` instead)
- ``bezier.inside_circle()`` (no replacement)

``animation.html_args`` rcParam
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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2 changes: 1 addition & 1 deletiondoc/api/next_api_changes/removals.rst
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Expand Up@@ -103,7 +103,7 @@ Classes, methods and attributes

- ``image.BboxImage.interp_at_native`` property (no replacement)
- ``lines.Line2D.verticalOffset`` property (no replacement)
- ``bezier.find_r_to_boundary_of_closedpath()`` (norelacement)
- ``bezier.find_r_to_boundary_of_closedpath()`` (noreplacement)

- ``quiver.Quiver.color()`` (use ``Quiver.get_facecolor()`` instead)
- ``quiver.Quiver.keyvec`` property (no replacement)
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@@ -0,0 +1,12 @@
Allow for custom marker scaling
-------------------------------
`~.markers.MarkerStyle` gained a keyword argument *normalization*, which may be
set to *"none"* to allow for custom paths to not be scaled.::

MarkerStyle(Path(...), normalization="none")

`~.markers.MarkerStyle` also gained a `~.markers.MarkerStyle.set_transform`
method to set affine transformations to existing markers.::

m = MarkerStyle("d")
m.set_transform(m.get_transform() + Affine2D().rotate_deg(30))
65 changes: 58 additions & 7 deletionsexamples/lines_bars_and_markers/scatter_piecharts.py
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Expand Up@@ -3,15 +3,19 @@
Scatter plot with pie chart markers
===================================

This example makes custom 'pie charts' as the markers for a scatter plot.

Thanks to Manuel Metz for the example.
This example shows two methods to make custom 'pie charts' as the markers
for a scatter plot.
"""

##########################################################################
# Manually creating marker vertices
# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
#

import numpy as np
import matplotlib.pyplot as plt

# first define the ratios
# first define thecumulativeratios
r1 = 0.2 # 20%
r2 = r1 + 0.4 # 40%

Expand All@@ -36,10 +40,55 @@
s3 = np.abs(xy3).max()

fig, ax = plt.subplots()
ax.scatter(range(3), range(3), marker=xy1, s=s1**2 * sizes, facecolor='blue')
ax.scatter(range(3), range(3), marker=xy2, s=s2**2 * sizes, facecolor='green')
ax.scatter(range(3), range(3), marker=xy3, s=s3**2 * sizes, facecolor='red')
ax.scatter(range(3), range(3), marker=xy1, s=s1**2 * sizes, facecolor='C0')
ax.scatter(range(3), range(3), marker=xy2, s=s2**2 * sizes, facecolor='C1')
ax.scatter(range(3), range(3), marker=xy3, s=s3**2 * sizes, facecolor='C2')

plt.show()


##########################################################################
# Using wedges as markers
# ~~~~~~~~~~~~~~~~~~~~~~~
#
# An alternative is to create custom markers from the `~.path.Path` of a
# `~.patches.Wedge`, which might be more versatile.
#

import numpy as np
import matplotlib.pyplot as plt
from matplotlib.patches import Wedge
from matplotlib.markers import MarkerStyle

# first define the ratios
r1 = 0.2 # 20%
r2 = r1 + 0.3 # 50%
r3 = 1 - r1 - r2 # 30%


def markers_from_ratios(ratios, width=1):
markers = []
angles = 360*np.concatenate(([0], np.cumsum(ratios)))
for i in range(len(angles)-1):
# create a Wedge within the unit square in between the given angles...
w = Wedge((0, 0), 0.5, angles[i], angles[i+1], width=width/2)
# ... and create a custom Marker from its path.
markers.append(MarkerStyle(w.get_path(), normalization="none"))
return markers

# define some sizes of the scatter marker
sizes = np.array([100, 200, 400, 800])
# collect the markers and some colors
markers = markers_from_ratios([r1, r2, r3], width=0.6)
colors = plt.cm.tab10.colors[:len(markers)]

fig, ax = plt.subplots()

for marker, color in zip(markers, colors):
ax.scatter(range(len(sizes)), range(len(sizes)), marker=marker, s=sizes,
edgecolor="none", facecolor=color)

ax.margins(0.1)
plt.show()

#############################################################################
Expand All@@ -55,3 +104,5 @@
import matplotlib
matplotlib.axes.Axes.scatter
matplotlib.pyplot.scatter
matplotlib.patches.Wedge
matplotlib.markers.MarkerStyle
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