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DOC: animation faster #24918

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merged 3 commits into from
Jan 11, 2023
Merged

DOC: animation faster #24918

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29fef40
DOC: animation faster
jklymak Jan 9, 2023
36df3ab
DOC: change artists, add annotation
jklymak Jan 10, 2023
c14227b
DOC: update doc string for update
jklymak Jan 10, 2023
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37 changes: 21 additions & 16 deletions tutorials/introductory/animation_tutorial.py
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Original file line number Diff line number Diff line change
Expand Up @@ -87,32 +87,37 @@
#
# Covering the set methods for all types of artists is beyond the scope of this
# tutorial but can be found in their respective documentations. An example of
# such update methods in use for `.Axes.scatter` is as follows.

# such update methods in use for `.Axes.scatter` and `.Axes.plot` is as follows.

fig, ax = plt.subplots()
t = np.linspace(-np.pi, np.pi, 400)
a, b = 3, 2
delta = np.pi / 2
t = np.linspace(0, 3, 40)
g = -9.81
v0 = 12
z = g * t**2 / 2 + v0 * t

v02 = 5
z2 = g * t**2 / 2 + v02 * t

scat = ax.scatter(np.sin(a * t[0] + delta), np.sin(b * t[0]), c="b", s=2)
ax.set_xlim(-1.5, 1.5)
ax.set_ylim(-1.5, 1.5)
scat = ax.scatter(t[0], z[0], c="b", s=5, label=f'v0 = {v0} m/s')
line2 = ax.plot(t[0], z2[0], label=f'v0 = {v02} m/s')[0]
ax.set(xlim=[0, 3], ylim=[-4, 10], xlabel='Time [s]', ylabel='Z [m]')
ax.legend()


def update(frame):
# .set_offsets replaces the offset data for the entire collection with
# the new values. Therefore, to also carry forward the previously
# calculated information, we use the data from the first to the current
# frame to set the new offsets.
Comment on lines -104 to -107
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I feel like an explanation about why we take the entire data for the new frame should be there since this is a tutorial. Maybe reword it a little but not remove it completely?

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I changed it a bit. Note I also added comments for the steps where the data was added, which basically says what you are saying in the old text, so I think it's relatively clear? If not, happy to take suggestions.

x = np.sin(a * t[:frame] + delta)
y = np.sin(b * t[:frame])
# for each frame, update the data stored on each artist.
x = t[:frame]
y = z[:frame]
# update the scatter plot:
data = np.stack([x, y]).T
scat.set_offsets(data)
return (scat,)
# update the line plot:
line2.set_xdata(t[:frame])
line2.set_ydata(z2[:frame])
return (scat, line2)


ani = animation.FuncAnimation(fig=fig, func=update, frames=400, interval=30)
ani = animation.FuncAnimation(fig=fig, func=update, frames=40, interval=30)
plt.show()


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