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"""
================
Polygon Selector
================
Shows how to create a polygon programmatically or interactively
"""
import matplotlib.pyplot as plt
from matplotlib.widgets import PolygonSelector
# %%
#
# To create the polygon programmatically
fig, ax = plt.subplots()
fig.show()
selector = PolygonSelector(ax, lambda *args: None)
# Add three vertices
selector.verts = [(0.1, 0.4), (0.5, 0.9), (0.3, 0.2)]
# %%
#
# To create the polygon interactively
fig2, ax2 = plt.subplots()
fig2.show()
selector2 = PolygonSelector(ax2, lambda *args: None)
print("Click on the figure to create a polygon.")
print("Press the 'esc' key to start a new polygon.")
print("Try holding the 'shift' key to move all of the vertices.")
print("Try holding the 'ctrl' key to move a single vertex.")
# %%
# .. tags::
#
# component: axes,
# styling: position,
# plot-type: line,
# level: intermediate,
# domain: cartography,
# domain: geometry,
# domain: statistics,
#
# .. admonition:: References
#
# The use of the following functions, methods, classes and modules is shown
# in this example:
#
# - `matplotlib.widgets.PolygonSelector`
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