# Connect Simple01ΒΆ

A ConnectionPatch can be used to draw a line (possibly with arrow head) between points defined in different coordinate systems and/or axes.

from matplotlib.patches import ConnectionPatch
import matplotlib.pyplot as plt

fig, (ax1, ax2) = plt.subplots(1, 2, figsize=(6, 3))

# Draw a simple arrow between two points in axes coordinates
# within a single axes.
xyA = (0.2, 0.2)
xyB = (0.8, 0.8)
coordsA = "data"
coordsB = "data"
con = ConnectionPatch(xyA, xyB, coordsA, coordsB,
arrowstyle="-|>", shrinkA=5, shrinkB=5,
mutation_scale=20, fc="w")
ax1.plot([xyA[0], xyB[0]], [xyA[1], xyB[1]], "o")

# Draw an arrow between the same point in data coordinates,
# but in different axes.
xy = (0.3, 0.2)
con = ConnectionPatch(
xyA=xy, coordsA=ax2.transData,
xyB=xy, coordsB=ax1.transData,
arrowstyle="->", shrinkB=5)

# Draw a line between the different points, defined in different coordinate
# systems.
con = ConnectionPatch(
# in axes coordinates
xyA=(0.6, 1.0), coordsA=ax2.transAxes,
# x in axes coordinates, y in data coordinates
xyB=(0.0, 0.2), coordsB=ax2.get_yaxis_transform(),
arrowstyle="-")

ax1.set_xlim(0, 1)
ax1.set_ylim(0, 1)
ax2.set_xlim(0, .5)
ax2.set_ylim(0, .5)

plt.show()


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