>>> """
=================
Simple Annotate01
=================

"""
... 
... import matplotlib.pyplot as plt
... import matplotlib.patches as mpatches
... 
... 
... fig, axs = plt.subplots(2, 4)
... x1, y1 = 0.3, 0.3
... x2, y2 = 0.7, 0.7
... 
... ax = axs.flat[0]
... ax.plot([x1, x2], [y1, y2], "o")
... ax.annotate("",
...             xy=(x1, y1), xycoords='data',
...             xytext=(x2, y2), textcoords='data',
...             arrowprops=dict(arrowstyle="->"))
... ax.text(.05, .95, "A $->$ B",
...         transform=ax.transAxes, ha="left", va="top")
... 
... ax = axs.flat[2]
... ax.plot([x1, x2], [y1, y2], "o")
... ax.annotate("",
...             xy=(x1, y1), xycoords='data',
...             xytext=(x2, y2), textcoords='data',
...             arrowprops=dict(arrowstyle="->", connectionstyle="arc3,rad=0.3",
...                             shrinkB=5))
... ax.text(.05, .95, "shrinkB=5",
...         transform=ax.transAxes, ha="left", va="top")
... 
... ax = axs.flat[3]
... ax.plot([x1, x2], [y1, y2], "o")
... ax.annotate("",
...             xy=(x1, y1), xycoords='data',
...             xytext=(x2, y2), textcoords='data',
...             arrowprops=dict(arrowstyle="->", connectionstyle="arc3,rad=0.3"))
... ax.text(.05, .95, "connectionstyle=arc3",
...         transform=ax.transAxes, ha="left", va="top")
... 
... ax = axs.flat[4]
... ax.plot([x1, x2], [y1, y2], "o")
... el = mpatches.Ellipse((x1, y1), 0.3, 0.4, angle=30, alpha=0.5)
... ax.add_artist(el)
... ax.annotate("",
...             xy=(x1, y1), xycoords='data',
...             xytext=(x2, y2), textcoords='data',
...             arrowprops=dict(arrowstyle="->", connectionstyle="arc3,rad=0.2"))
... 
... ax = axs.flat[5]
... ax.plot([x1, x2], [y1, y2], "o")
... el = mpatches.Ellipse((x1, y1), 0.3, 0.4, angle=30, alpha=0.5)
... ax.add_artist(el)
... ax.annotate("",
...             xy=(x1, y1), xycoords='data',
...             xytext=(x2, y2), textcoords='data',
...             arrowprops=dict(arrowstyle="->", connectionstyle="arc3,rad=0.2",
...                             patchB=el))
... ax.text(.05, .95, "patchB",
...         transform=ax.transAxes, ha="left", va="top")
... 
... ax = axs.flat[6]
... ax.plot([x1], [y1], "o")
... ax.annotate("Test",
...             xy=(x1, y1), xycoords='data',
...             xytext=(x2, y2), textcoords='data',
...             ha="center", va="center",
...             bbox=dict(boxstyle="round", fc="w"),
...             arrowprops=dict(arrowstyle="->"))
... ax.text(.05, .95, "annotate",
...         transform=ax.transAxes, ha="left", va="top")
... 
... ax = axs.flat[7]
... ax.plot([x1], [y1], "o")
... ax.annotate("Test",
...             xy=(x1, y1), xycoords='data',
...             xytext=(x2, y2), textcoords='data',
...             ha="center", va="center",
...             bbox=dict(boxstyle="round", fc="w", ),
...             arrowprops=dict(arrowstyle="->", relpos=(0., 0.)))
... ax.text(.05, .95, "relpos=(0, 0)",
...         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()
...