Question

假设我有一个带有3个图的图形画布... 2是用imshow绘制的相同尺寸的图像，另一个是其他类型的子图。我希望能够链接imshow图的x和y轴，这样当我放大一个（使用NavigationToolbar提供的缩放工具）时，另一个缩放到相同的坐标，当我在一个平移时，其他平底锅也是。

散点图和直方图等子图方法可以通过kwargs指定sharex和sharey的轴，但imshow没有这样的配置。

我开始通过子类化NavigationToolbar2WxAgg（如下所示）来解决这个问题......但这里有几个问题。 1）这将链接画布中所有绘图的轴，因为我所做的就是摆脱对a.in_axes（）的检查 2）这适用于平移，但缩放导致所有子图从同一个全局点放大，而不是从各自轴的相同点放大。

有人可以建议解决方法吗？

非常感谢！ - 亚当

from matplotlib.backends.backend_wxagg import NavigationToolbar2WxAgg
class MyNavToolbar(NavigationToolbar2WxAgg):
    def __init__(self, canvas, cpfig):
        NavigationToolbar2WxAgg.__init__(self, canvas)

    # overrided
    # As mentioned in the code below, the only difference here from overridden
    # method is that this one doesn't check a.in_axes(event) when deciding which
    # axes to start the pan in...
    def press_pan(self, event):
        'the press mouse button in pan/zoom mode callback'

        if event.button == 1:
            self._button_pressed=1
        elif  event.button == 3:
            self._button_pressed=3
        else:
            self._button_pressed=None
            return

        x, y = event.x, event.y

        # push the current view to define home if stack is empty
        if self._views.empty(): self.push_current()

        self._xypress=[]
        for i, a in enumerate(self.canvas.figure.get_axes()):
            # only difference from overridden method is that this one doesn't
            # check a.in_axes(event)
            if x is not None and y is not None and a.get_navigate():
                a.start_pan(x, y, event.button)
                self._xypress.append((a, i))
                self.canvas.mpl_disconnect(self._idDrag)
                self._idDrag=self.canvas.mpl_connect('motion_notify_event', self.drag_pan)

    # overrided
    def press_zoom(self, event):
        'the press mouse button in zoom to rect mode callback'
        if event.button == 1:
            self._button_pressed=1
        elif  event.button == 3:
            self._button_pressed=3
        else:
            self._button_pressed=None
            return

        x, y = event.x, event.y

        # push the current view to define home if stack is empty
        if self._views.empty(): self.push_current()

        self._xypress=[]
        for i, a in enumerate(self.canvas.figure.get_axes()):
            # only difference from overridden method is that this one doesn't
            # check a.in_axes(event) 
            if x is not None and y is not None and a.get_navigate() and a.can_zoom():
                self._xypress.append(( x, y, a, i, a.viewLim.frozen(), a.transData.frozen()))

        self.press(event)

Answer 1

我没有意识到sharex可以传递给add_subplot ...

f = plt.figure()
ax1 = f.add_subplot(211)
ax2 = f.add_subplot(212, sharex=ax1, sharey=ax1)
ax1.imshow(np.random.randn(10,10), interpolation='nearest')
ax2.imshow(np.random.randn(10,10), interpolation='nearest')
f.canvas.draw()

但是，如果您尝试执行以下操作来设置轴对象以显示图像。

ax1.axis('image')

你会得到：

ValueError: adjustable must be "datalim" for shared axes

matplotlib的家伙告诉我，我可以使用

ax1.set_adjustable("box-forced")
ax2.set_adjustable("box-forced")

相反，但它不适用于我使用matplotlib版本0.98.5.3 ...我认为它将使用更新的版本。我收到回复时会更新。

如何链接imshow图的轴进行缩放和平移？

1 个答案: