>>> """
================
Annotate Explain
================

"""
... 
... import matplotlib.pyplot as plt
... import matplotlib.patches as mpatches
... 
... 
... fig, axs = plt.subplots(2, 2)
... x1, y1 = 0.3, 0.3
... x2, y2 = 0.7, 0.7
... 
... ax = axs.flat[0]
... ax.plot([x1, x2], [y1, y2], ".")
... el = mpatches.Ellipse((x1, y1), 0.3, 0.4, angle=30, alpha=0.2)
... ax.add_artist(el)
... ax.annotate("",
...             xy=(x1, y1), xycoords='data',
...             xytext=(x2, y2), textcoords='data',
...             arrowprops=dict(arrowstyle="-",
...                             color="0.5",
...                             patchB=None,
...                             shrinkB=0,
...                             connectionstyle="arc3,rad=0.3",
...                             ),
...             )
... ax.text(.05, .95, "connect", transform=ax.transAxes, ha="left", va="top")
... 
... ax = axs.flat[1]
... ax.plot([x1, x2], [y1, y2], ".")
... el = mpatches.Ellipse((x1, y1), 0.3, 0.4, angle=30, alpha=0.2)
... ax.add_artist(el)
... ax.annotate("",
...             xy=(x1, y1), xycoords='data',
...             xytext=(x2, y2), textcoords='data',
...             arrowprops=dict(arrowstyle="-",
...                             color="0.5",
...                             patchB=el,
...                             shrinkB=0,
...                             connectionstyle="arc3,rad=0.3",
...                             ),
...             )
... ax.text(.05, .95, "clip", transform=ax.transAxes, ha="left", va="top")
... 
... ax = axs.flat[2]
... ax.plot([x1, x2], [y1, y2], ".")
... el = mpatches.Ellipse((x1, y1), 0.3, 0.4, angle=30, alpha=0.2)
... ax.add_artist(el)
... ax.annotate("",
...             xy=(x1, y1), xycoords='data',
...             xytext=(x2, y2), textcoords='data',
...             arrowprops=dict(arrowstyle="-",
...                             color="0.5",
...                             patchB=el,
...                             shrinkB=5,
...                             connectionstyle="arc3,rad=0.3",
...                             ),
...             )
... ax.text(.05, .95, "shrink", transform=ax.transAxes, ha="left", va="top")
... 
... ax = axs.flat[3]
... ax.plot([x1, x2], [y1, y2], ".")
... el = mpatches.Ellipse((x1, y1), 0.3, 0.4, angle=30, alpha=0.2)
... ax.add_artist(el)
... ax.annotate("",
...             xy=(x1, y1), xycoords='data',
...             xytext=(x2, y2), textcoords='data',
...             arrowprops=dict(arrowstyle="fancy",
...                             color="0.5",
...                             patchB=el,
...                             shrinkB=5,
...                             connectionstyle="arc3,rad=0.3",
...                             ),
...             )
... ax.text(.05, .95, "mutate", transform=ax.transAxes, ha="left", va="top")
... 
... for ax in axs.flat:
...     ax.set(xlim=(0, 1), ylim=(0, 1), xticks=[], yticks=[], aspect=1)
... 
... plt.show()
...