From fb5a043f5ccd7e6ec3dc5fed4d8e83a22f98e50d Mon Sep 17 00:00:00 2001
From: Aschauer <johannes.aschauer@slf.ch>
Date: Mon, 14 Nov 2022 15:37:19 +0100
Subject: [PATCH 1/3] DOC: add spinning circle icon animation example

---
 examples/animation/spinning_circle.py | 49 +++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)
 create mode 100644 examples/animation/spinning_circle.py

diff --git a/examples/animation/spinning_circle.py b/examples/animation/spinning_circle.py
new file mode 100644
index 000000000000..aea0eafa8f97
--- /dev/null
+++ b/examples/animation/spinning_circle.py
@@ -0,0 +1,49 @@
+"""
+=========================
+Spinning circle animation
+=========================
+
+This example shows how to create an animated spinning circle loading icon.
+"""
+
+import numpy as np
+import matplotlib.pyplot as plt
+import matplotlib.animation as animation
+
+fig, ax = plt.subplots(subplot_kw={'projection': 'polar'})
+
+ax.axis('off')
+
+lines = ax.vlines(
+    np.radians(np.arange(0, 360, 30)),
+    0.5, 
+    1, 
+    lw=17,
+    colors=np.linspace(0.15, 0.85, 12, dtype=str),
+    capstyle='round',
+)
+
+ax.set_rmax(1.1)  # make round capstyle on outside visible
+
+def update(*args):
+    new_colors = np.roll(lines.get_colors(), shift=-1, axis=0)
+    lines.set_color(new_colors)
+    return lines
+
+
+ani = animation.FuncAnimation(
+    fig, 
+    update,
+    interval=100)
+
+plt.show()
+
+#############################################################################
+#
+# .. admonition:: References
+#
+#    The use of the following functions, methods, classes and modules is shown
+#    in this example:
+#
+#    - `matplotlib.axes.Axes.vlines` / `matplotlib.pyplot.vlines`
+#    - `matplotlib.animation.FuncAnimation`

From b947e14a56f4479d844594f4240ad99bc68c825f Mon Sep 17 00:00:00 2001
From: Johannes Aschauer <38501948+joAschauer@users.noreply.github.com>
Date: Mon, 14 Nov 2022 15:52:03 +0100
Subject: [PATCH 2/3] return sequence af artists in update function

Co-authored-by: Thomas A Caswell <tcaswell@gmail.com>
---
 examples/animation/spinning_circle.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/examples/animation/spinning_circle.py b/examples/animation/spinning_circle.py
index aea0eafa8f97..0f18a94f1265 100644
--- a/examples/animation/spinning_circle.py
+++ b/examples/animation/spinning_circle.py
@@ -28,7 +28,7 @@
 def update(*args):
     new_colors = np.roll(lines.get_colors(), shift=-1, axis=0)
     lines.set_color(new_colors)
-    return lines
+    return lines,
 
 
 ani = animation.FuncAnimation(

From 5f930d48b1b16de5a1950e81182d175d810eb54d Mon Sep 17 00:00:00 2001
From: Aschauer <johannes.aschauer@slf.ch>
Date: Mon, 14 Nov 2022 16:00:01 +0100
Subject: [PATCH 3/3] trim trailing whitespaces

---
 examples/animation/spinning_circle.py | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/examples/animation/spinning_circle.py b/examples/animation/spinning_circle.py
index 0f18a94f1265..bf8ff08a4477 100644
--- a/examples/animation/spinning_circle.py
+++ b/examples/animation/spinning_circle.py
@@ -16,8 +16,8 @@
 
 lines = ax.vlines(
     np.radians(np.arange(0, 360, 30)),
-    0.5, 
-    1, 
+    0.5,
+    1,
     lw=17,
     colors=np.linspace(0.15, 0.85, 12, dtype=str),
     capstyle='round',
@@ -32,7 +32,7 @@ def update(*args):
 
 
 ani = animation.FuncAnimation(
-    fig, 
+    fig,
     update,
     interval=100)