Matplotlib arrow (annotate) bug (#1402)

arrows.py

#!/usr/bin/env python2
# -*- coding: utf-8 -*-

import matplotlib.pyplot as plt

fig1 = plt.figure()

ax1 = fig1.add_subplot(221)
ax2 = fig1.add_subplot(222)
ax3 = fig1.add_subplot(223)
ax4 = fig1.add_subplot(224)
axes = [ax1, ax2, ax3, ax4]

r0 = [0.5, 0.0]
r1 = [0.5, 1.0]

ylims = [( 0.0,  1.0),
         (-0.5,  1.5),
         ( 0.5,  1.5),
         (-0.5,  0.5)]

for i in xrange(len(axes)):
    ax = axes[i]
    ann = ax.annotate('', xy     = (r1[0], r1[1]), xycoords='data',
                    xytext = (r0[0], r0[1]), textcoords='data',
                    arrowprops=dict(arrowstyle="-|>"),
                    annotation_clip=False)
    ann.arrow_patch.set_clip_box(ax.bbox)
    ax.set_xlim(( 0.0,  1.0))
    ax.set_ylim(ylims[i])
    ax.text(0.6, 0.5, str(ylims[i]), transform=ax.transAxes)

plt.show()

matplotlib_arrows_bug.png