重叠轴的平移/缩放事件

示例说明如何处理重叠轴的平移/缩放事件。

默认情况如下

• 具有可见补丁的轴捕获平移/缩放事件

• 具有不可见补丁的轴将平移/缩放事件转发到下面的轴

• 共享轴始终与其父轴一起触发（无论补丁可见性如何）

注意：此处的补丁可见性是指 ax.patch.get_visible() 的值。补丁的颜色和透明度对平移/缩放事件的处理没有影响！

ax.set_forward_navigation_events(val) 可用于覆盖默认行为

• True: 将导航事件转发到下面的轴。

• False: 仅在此轴上执行导航事件。

• "auto": 使用默认行为。

要完全禁用平移/缩放事件，请使用 ax.set_navigate(False)

import matplotlib.pyplot as plt

fig = plt.figure(figsize=(11, 6))
fig.suptitle("Showcase for pan/zoom events on overlapping axes.")

ax = fig.add_axes((.05, .05, .9, .9))
ax.patch.set_color(".75")
ax_twin = ax.twinx()

ax1 = fig.add_subplot(221)
ax1_twin = ax1.twinx()
ax1.text(.5, .5,
         "Visible patch\n\n"
         "Pan/zoom events are NOT\n"
         "forwarded to axes below",
         ha="center", va="center", transform=ax1.transAxes)

ax11 = fig.add_subplot(223, sharex=ax1, sharey=ax1)
ax11.set_forward_navigation_events(True)
ax11.text(.5, .5,
          "Visible patch\n\n"
          "Override capture behavior:\n\n"
          "ax.set_forward_navigation_events(True)",
          ha="center", va="center", transform=ax11.transAxes)

ax2 = fig.add_subplot(222)
ax2_twin = ax2.twinx()
ax2.patch.set_visible(False)
ax2.text(.5, .5,
         "Invisible patch\n\n"
         "Pan/zoom events are\n"
         "forwarded to axes below",
         ha="center", va="center", transform=ax2.transAxes)

ax22 = fig.add_subplot(224, sharex=ax2, sharey=ax2)
ax22.patch.set_visible(False)
ax22.set_forward_navigation_events(False)
ax22.text(.5, .5,
          "Invisible patch\n\n"
          "Override capture behavior:\n\n"
          "ax.set_forward_navigation_events(False)",
          ha="center", va="center", transform=ax22.transAxes)