8000 Merge arrow_simple_demo into arrow_guide. by anntzer · Pull Request #20386 · matplotlib/matplotlib · GitHub
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Merge arrow_simple_demo into arrow_guide. #20386

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Merged
merged 1 commit into from
Jun 10, 2021
Merged

Merge arrow_simple_demo into arrow_guide. #20386

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34 changes: 25 additions & 9 deletions examples/shapes_and_collections/arrow_guide.py
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Original file line number Diff line number Diff line change
Expand Up @@ -23,13 +23,16 @@
3. Entire patch fixed in data space

Below each use case is presented in turn.

.. redirect-from:: /gallery/text_labels_and_annotations/arrow_simple_demo
"""

import matplotlib.patches as mpatches
import matplotlib.pyplot as plt
x_tail = 0.1
y_tail = 0.1
y_tail = 0.5
x_head = 0.9
y_head = 0.9
y_head = 0.8
dx = x_head - x_tail
dy = y_head - y_tail

Expand All @@ -54,8 +57,7 @@
arrow = mpatches.FancyArrowPatch((x_tail, y_tail), (x_head, y_head),
mutation_scale=100)
axs[1].add_patch(arrow)
axs[1].set_xlim(0, 2)
axs[1].set_ylim(0, 2)
axs[1].set(xlim=(0, 2), ylim=(0, 2))

###############################################################################
# Head shape and anchor points fixed in display space
Expand All @@ -81,28 +83,42 @@
mutation_scale=100,
transform=axs[1].transAxes)
axs[1].add_patch(arrow)
axs[1].set_xlim(0, 2)
axs[1].set_ylim(0, 2)
axs[1].set(xlim=(0, 2), ylim=(0, 2))


###############################################################################
# Head shape and anchor points fixed in data space
# ------------------------------------------------
#
# In this case we use `.patches.Arrow`.
# In this case we use `.patches.Arrow`, or `.patches.FancyArrow` (the latter is
# in orange).
#
# Note that when the axis limits are changed, the arrow shape and location
# change.
#
# `.FancyArrow`'s API is relatively awkward, and requires in particular passing
# ``length_includes_head=True`` so that the arrow *tip* is ``(dx, dy)`` away
# from the arrow start. It is only included in this reference because it is
# the arrow class returned by `.Axes.arrow` (in green).

fig, axs = plt.subplots(nrows=2)

arrow = mpatches.Arrow(x_tail, y_tail, dx, dy)
axs[0].add_patch(arrow)
arrow = mpatches.FancyArrow(x_tail, y_tail - .4, dx, dy,
width=.1, length_includes_head=True, color="C1")
axs[0].add_patch(arrow)
axs[0].arrow(x_tail + 1, y_tail - .4, dx, dy,
width=.1, length_includes_head=True, color="C2")

arrow = mpatches.Arrow(x_tail, y_tail, dx, dy)
axs[1].add_patch(arrow)
axs[1].set_xlim(0, 2)
axs[1].set_ylim(0, 2)
arrow = mpatches.FancyArrow(x_tail, y_tail - .4, dx, dy,
width=.1, length_includes_head=True, color="C1")
axs[1].add_patch(arrow)
axs[1].arrow(x_tail + 1, y_tail - .4, dx, dy,
width=.1, length_includes_head=True, color="C2")
axs[1].set(xlim=(0, 2), ylim=(0, 2))
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Should it be ymax=2? Seems to be a lot of whitespace in the bottom Axes compared to the top one.

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That's intentional to be consistent with the other figures created by this example and to show the distortion that occurs when drawing arrows in data coords.


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

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11 changes: 0 additions & 11 deletions examples/text_labels_and_annotations/arrow_simple_demo.py
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