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

if 1:
    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('arrowstyle', xy=(0, 1), xycoords='data',
                xytext=(-50, 30), textcoords='offset points',
                arrowprops=dict(arrowstyle="->")
                )

    ax.annotate('arc3', xy=(0.5, -1), xycoords='data',
                xytext=(-30, -30), textcoords='offset points',
                arrowprops=dict(arrowstyle="->",
                                connectionstyle="arc3,rad=.2")
                )

    ax.annotate('arc', xy=(1., 1), xycoords='data',
                xytext=(-40, 30), textcoords='offset points',
                arrowprops=dict(arrowstyle="->",
                                connectionstyle="arc,angleA=0,armA=30,rad=10"),
                )

    ax.annotate('arc', xy=(1.5, -1), xycoords='data',
                xytext=(-40, -30), textcoords='offset points',
                arrowprops=dict(arrowstyle="->",
                                connectionstyle="arc,angleA=0,armA=20,angleB=-90,armB=15,rad=7"),
                )

    ax.annotate('angle', xy=(2., 1), xycoords='data',
                xytext=(-50, 30), textcoords='offset points',
                arrowprops=dict(arrowstyle="->",
                                connectionstyle="angle,angleA=0,angleB=90,rad=10"),
                )

    ax.annotate('angle3', xy=(2.5, -1), xycoords='data',
                xytext=(-50, -30), textcoords='offset points',
                arrowprops=dict(arrowstyle="->",
                                connectionstyle="angle3,angleA=0,angleB=-90"),
                )

    ax.annotate('angle', xy=(3., 1), xycoords='data',
                xytext=(-50, 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', xy=(3.5, -1), xycoords='data',
                xytext=(-70, -60), 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', xy=(4., 1), xycoords='data',
                xytext=(-50, 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"),
                )

    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,
                                      )
                      )


if 1:
    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('fancy', 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('simple', 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('wedge', xy=(2., -1), xycoords='data',
                      xytext=(0, -45), 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('wedge', xy=(2., -1), xycoords='data',
                      xytext=(35, 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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