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Simplify "artist reference" example. #25018

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Jan 20, 2023
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Simplify "artist reference" example. #25018

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120 changes: 34 additions & 86 deletions examples/shapes_and_collections/artist_reference.py
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Original file line number Diff line number Diff line change
Expand Up @@ -3,66 +3,25 @@
Reference for Matplotlib artists
================================

This example displays several of Matplotlib's graphics primitives (artists)
drawn using matplotlib API. A full list of artists and the documentation is
available at :ref:`the artist API <artist-api>`.
This example displays several of Matplotlib's graphics primitives (artists).
A full list of artists is documented at :ref:`the artist API <artist-api>`.

See also :doc:`/gallery/shapes_and_collections/patch_collection`, which groups
all artists into a single `.PatchCollection` instead.

Copyright (c) 2010, Bartosz Telenczuk
BSD License
"""
import matplotlib.pyplot as plt
import numpy as np
import matplotlib.path as mpath

import matplotlib as mpl
import matplotlib.lines as mlines
import matplotlib.patches as mpatches
from matplotlib.collections import PatchCollection


def label(xy, text):
y = xy[1] - 0.15 # shift y-value for label so that it's below the artist
plt.text(xy[0], y, text, ha="center", family='sans-serif', size=14)


fig, ax = plt.subplots()
# create 3x3 grid to plot the artists
grid = np.mgrid[0.2:0.8:3j, 0.2:0.8:3j].reshape(2, -1).T

patches = []

# add a circle
circle = mpatches.Circle(grid[0], 0.1, ec="none")
patches.append(circle)
label(grid[0], "Circle")

# add a rectangle
rect = mpatches.Rectangle(grid[1] - [0.025, 0.05], 0.05, 0.1, ec="none")
patches.append(rect)
label(grid[1], "Rectangle")

# add a wedge
wedge = mpatches.Wedge(grid[2], 0.1, 30, 270, ec="none")
patches.append(wedge)
label(grid[2], "Wedge")

# add a Polygon
polygon = mpatches.RegularPolygon(grid[3], 5, radius=0.1)
patches.append(polygon)
label(grid[3], "Polygon")

# add an ellipse
ellipse = mpatches.Ellipse(grid[4], 0.2, 0.1)
patches.append(ellipse)
label(grid[4], "Ellipse")

# add an arrow
arrow = mpatches.Arrow(grid[5, 0] - 0.05, grid[5, 1] - 0.05, 0.1, 0.1,
width=0.1)
patches.append(arrow)
label(grid[5], "Arrow")
import matplotlib.path as mpath
import matplotlib.pyplot as plt

# add a path patch
# Prepare the data for the PathPatch below.
Path = mpath.Path
path_data = [
codes, verts = zip(*[
(Path.MOVETO, [0.018, -0.11]),
(Path.CURVE4, [-0.031, -0.051]),
(Path.CURVE4, [-0.115, 0.073]),
Expand All @@ -71,35 +30,28 @@ def label(xy, text):
(Path.CURVE4, [0.043, 0.121]),
(Path.CURVE4, [0.075, -0.005]),
(Path.CURVE4, [0.035, -0.027]),
(Path.CLOSEPOLY, [0.018, -0.11])]
codes, verts = zip(*path_data)
path = mpath.Path(verts + grid[6], codes)
patch = mpatches.PathPatch(path)
patches.append(patch)
label(grid[6], "PathPatch")

# add a fancy box
fancybox = mpatches.FancyBboxPatch(
grid[7] - [0.025, 0.05], 0.05, 0.1,
boxstyle=mpatches.BoxStyle("Round", pad=0.02))
patches.append(fancybox)
label(grid[7], "FancyBboxPatch")

# add a line
x, y = ([-0.06, 0.0, 0.1], [0.05, -0.05, 0.05])
line = mlines.Line2D(x + grid[8, 0], y + grid[8, 1], lw=5., alpha=0.3)
label(grid[8], "Line2D")

colors = np.linspace(0, 1, len(patches))
collection = PatchCollection(patches, cmap=plt.cm.hsv, alpha=0.3)
collection.set_array(colors)
ax.add_collection(collection)
ax.add_line(line)

plt.axis('equal')
plt.axis('off')
plt.tight_layout()

(Path.CLOSEPOLY, [0.018, -0.11])])

artists = [
mpatches.Circle((0, 0), 0.1, ec="none"),
mpatches.Rectangle((-0.025, -0.05), 0.05, 0.1, ec="none"),
mpatches.Wedge((0, 0), 0.1, 30, 270, ec="none"),
mpatches.RegularPolygon((0, 0), 5, radius=0.1),
mpatches.Ellipse((0, 0), 0.2, 0.1),
mpatches.Arrow(-0.05, -0.05, 0.1, 0.1, width=0.1),
mpatches.PathPatch(mpath.Path(verts, codes), ec="none"),
mpatches.FancyBboxPatch((-0.025, -0.05), 0.05, 0.1, ec="none",
boxstyle=mpatches.BoxStyle("Round", pad=0.02)),
mlines.Line2D([-0.06, 0.0, 0.1], [0.05, -0.05, 0.05], lw=5),
]

axs = plt.figure(figsize=(6, 6), layout="constrained").subplots(3, 3)
for i, (ax, artist) in enumerate(zip(axs.flat, artists)):
artist.set(color=mpl.colormaps["hsv"](i / len(artists)))
ax.add_artist(artist)
ax.set(title=type(artist).__name__,
aspect=1, xlim=(-.2, .2), ylim=(-.2, .2))
ax.set_axis_off()
plt.show()

#############################################################################
Expand All @@ -122,8 +74,4 @@ def label(xy, text):
# - `matplotlib.patches.PathPatch`
# - `matplotlib.patches.FancyBboxPatch`
# - `matplotlib.patches.RegularPolygon`
# - `matplotlib.collections`
# - `matplotlib.collections.PatchCollection`
# - `matplotlib.cm.ScalarMappable.set_array`
# - `matplotlib.axes.Axes.add_collection`
# - `matplotlib.axes.Axes.add_line`
# - `matplotlib.axes.Axes.add_artist`
3 changes: 3 additions & 0 deletions examples/shapes_and_collections/patch_collection.py
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Expand Up @@ -4,6 +4,9 @@
============================

This example demonstrates how to use `.collections.PatchCollection`.

See also :doc:`/gallery/shapes_and_collections/artist_reference`, which instead
adds each artist separately to its own axes.
"""

import numpy as np
Expand Down