8000 Backport PR #14062 on branch v3.1.x (Improve advanced quiver example) by meeseeksmachine · Pull Request #14067 · matplotlib/matplotlib · GitHub
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Backport PR #14062 on branch v3.1.x (Improve advanced quiver example) #14067

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Merged
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Apr 27, 2019
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Backport PR #14062 on branch v3.1.x (Improve advanced quiver example) #14067

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19 changes: 11 additions & 8 deletions examples/images_contours_and_fields/quiver_demo.py
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"""
========================================================
Demonstration of advanced quiver and quiverkey functions
========================================================
=======================================
Advanced quiver and quiverkey functions
=======================================

Demonstrates some more advanced options for `~.axes.Axes.quiver`. For a simple
example refer to :doc:`/gallery/images_contours_and_fields/quiver_simple_demo`.

Known problem: the plot autoscaling does not take into account the arrows, so
those on the boundaries are often out of the picture. This is *not* an easy
problem to solve in a perfectly general way. The workaround is to manually
expand the Axes objects.
Note: The plot autoscaling does not take into account the arrows, so
those on the boundaries may reach out of the picture. This is not an easy
problem to solve in a perfectly general way. The recommended workaround is to
manually set the Axes limits in such a case.
"""

import matplotlib.pyplot as plt
import numpy as np

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###############################################################################

# sphinx_gallery_thumbnail_number = 3

fig3, ax3 = plt.subplots()
ax3.set_title("pivot='tip'; scales with x view")
M = np.hypot(U, V)
Q = ax3.quiver(X, Y, U, V, M, units='x', pivot='tip', width=0.022,
scale=1 / 0.15)
qk = ax3.quiverkey(Q, 0.9, 0.9, 1, r'$1 \frac{m}{s}$', labelpos='E',
coordinates='figure')
ax3.scatter(X, Y, color='k', s=5)
ax3.scatter(X, Y, color='0.5', s=1)

plt.show()

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