pylab_examples example code: annotation_demo2.py

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import matplotlib.pyplot as plt
from matplotlib.patches import Ellipse
import numpy as np


fig = plt.figure(1, figsize=(8, 5))
ax = fig.add_subplot(111, autoscale_on=False, xlim=(-1, 5), ylim=(-4, 3))

t = np.arange(0.0, 5.0, 0.01)
s = np.cos(2*np.pi*t)
line, = ax.plot(t, s, lw=3)

ax.annotate('straight',
            xy=(0, 1), xycoords='data',
            xytext=(-50, 30), textcoords='offset points',
            arrowprops=dict(arrowstyle="->"))

ax.annotate('arc3,\nrad 0.2',
            xy=(0.5, -1), xycoords='data',
            xytext=(-80, -60), textcoords='offset points',
            arrowprops=dict(arrowstyle="->",
                            connectionstyle="arc3,rad=.2"))

ax.annotate('arc,\nangle 50',
            xy=(1., 1), xycoords='data',
            xytext=(-90, 50), textcoords='offset points',
            arrowprops=dict(arrowstyle="->",
                            connectionstyle="arc,angleA=0,armA=50,rad=10"))

ax.annotate('arc,\narms',
            xy=(1.5, -1), xycoords='data',
            xytext=(-80, -60), textcoords='offset points',
            arrowprops=dict(arrowstyle="->",
                            connectionstyle="arc,angleA=0,armA=40,angleB=-90,armB=30,rad=7"))

ax.annotate('angle,\nangle 90',
            xy=(2., 1), xycoords='data',
            xytext=(-70, 30), textcoords='offset points',
            arrowprops=dict(arrowstyle="->",
                            connectionstyle="angle,angleA=0,angleB=90,rad=10"))

ax.annotate('angle3,\nangle -90',
            xy=(2.5, -1), xycoords='data',
            xytext=(-80, -60), textcoords='offset points',
            arrowprops=dict(arrowstyle="->",
                            connectionstyle="angle3,angleA=0,angleB=-90"))

ax.annotate('angle,\nround',
            xy=(3., 1), xycoords='data',
            xytext=(-60, 30), textcoords='offset points',
            bbox=dict(boxstyle="round", fc="0.8"),
            arrowprops=dict(arrowstyle="->",
                            connectionstyle="angle,angleA=0,angleB=90,rad=10"))

ax.annotate('angle,\nround4',
            xy=(3.5, -1), xycoords='data',
            xytext=(-70, -80), textcoords='offset points',
            size=20,
            bbox=dict(boxstyle="round4,pad=.5", fc="0.8"),
            arrowprops=dict(arrowstyle="->",
                            connectionstyle="angle,angleA=0,angleB=-90,rad=10"))

ax.annotate('angle,\nshrink',
            xy=(4., 1), xycoords='data',
            xytext=(-60, 30), textcoords='offset points',
            bbox=dict(boxstyle="round", fc="0.8"),
            arrowprops=dict(arrowstyle="->",
                            shrinkA=0, shrinkB=10,
                            connectionstyle="angle,angleA=0,angleB=90,rad=10"))

# You can pass an empty string to get only annotation arrows rendered
ann = ax.annotate('', xy=(4., 1.), xycoords='data',
                  xytext=(4.5, -1), textcoords='data',
                  arrowprops=dict(arrowstyle="<->",
                                  connectionstyle="bar",
                                  ec="k",
                                  shrinkA=5, shrinkB=5))


fig = plt.figure(2)
fig.clf()
ax = fig.add_subplot(111, autoscale_on=False, xlim=(-1, 5), ylim=(-5, 3))

el = Ellipse((2, -1), 0.5, 0.5)
ax.add_patch(el)

ax.annotate('$->$',
            xy=(2., -1), xycoords='data',
            xytext=(-150, -140), textcoords='offset points',
            bbox=dict(boxstyle="round", fc="0.8"),
            arrowprops=dict(arrowstyle="->",
                            patchB=el,
                            connectionstyle="angle,angleA=90,angleB=0,rad=10"))

ax.annotate('arrow\nfancy',
            xy=(2., -1), xycoords='data',
            xytext=(-100, 60), textcoords='offset points',
            size=20,
            # bbox=dict(boxstyle="round", fc="0.8"),
            arrowprops=dict(arrowstyle="fancy",
                            fc="0.6", ec="none",
                            patchB=el,
                            connectionstyle="angle3,angleA=0,angleB=-90"))

ax.annotate('arrow\nsimple',
            xy=(2., -1), xycoords='data',
            xytext=(100, 60), textcoords='offset points',
            size=20,
            # bbox=dict(boxstyle="round", fc="0.8"),
            arrowprops=dict(arrowstyle="simple",
                            fc="0.6", ec="none",
                            patchB=el,
                            connectionstyle="arc3,rad=0.3"))

ax.annotate('wedge',
            xy=(2., -1), xycoords='data',
            xytext=(-100, -100), textcoords='offset points',
            size=20,
            # bbox=dict(boxstyle="round", fc="0.8"),
            arrowprops=dict(arrowstyle="wedge,tail_width=0.7",
                            fc="0.6", ec="none",
                            patchB=el,
                            connectionstyle="arc3,rad=-0.3"))

ann = ax.annotate('bubble,\ncontours',
                  xy=(2., -1), xycoords='data',
                  xytext=(0, -70), textcoords='offset points',
                  size=20,
                  bbox=dict(boxstyle="round",
                            fc=(1.0, 0.7, 0.7),
                            ec=(1., .5, .5)),
                  arrowprops=dict(arrowstyle="wedge,tail_width=1.",
                                  fc=(1.0, 0.7, 0.7), ec=(1., .5, .5),
                                  patchA=None,
                                  patchB=el,
                                  relpos=(0.2, 0.8),
                                  connectionstyle="arc3,rad=-0.1"))

ann = ax.annotate('bubble',
                  xy=(2., -1), xycoords='data',
                  xytext=(55, 0), textcoords='offset points',
                  size=20, va="center",
                  bbox=dict(boxstyle="round", fc=(1.0, 0.7, 0.7), ec="none"),
                  arrowprops=dict(arrowstyle="wedge,tail_width=1.",
                                  fc=(1.0, 0.7, 0.7), ec="none",
                                  patchA=None,
                                  patchB=el,
                                  relpos=(0.2, 0.5)))

plt.show()

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