matplotlib:如何拿起班点击图? [英] matplotlib: How to pick up shift click on figure?

问题描述

我有一个matplotlib，并且已经创建了一个 button_press_event ，如下所示:

I have a matplotlib and I have created a button_press_event like this:

self.fig.canvas.mpl_connect('button_press_event', self.onClick)

def onClick(self, event)
    if event.button == 1:
        # draw some artists on left click

    elif event.button == 2:
        # draw a vertical line on the mouse x location on wheel click

    elif event.button == 3:
        # clear artists on right click

现在可以将滚轮点击处理程序修改为类似的内容

Now is it possible to modify the wheel click handler to something like this

    elif event.button == 2 or (event.button == 1 and event.key == "shift"):
        # draw a vertical line on the mouse x location 
        # on wheel click or on shift+left click 
        # (alternative way if there is no wheel for example)

似乎 button_press_event 不支持键，并且 key_press_event 不支持鼠标单击，但是我不确定.

It seems that button_press_event doesn't support keys and key_press_event doesn't support mouse button clicks, but I'm not sure.

有办法吗?

推荐答案

你还可以绑定一个按键按下和按键释放事件，并执行如下操作:

You can also bind a key press and key release events and do something like:

self.fig.canvas.mpl_connect('key_press_event', self.on_key_press)
self.fig.canvas.mpl_connect('key_release_event', self.on_key_release)

...

def on_key_press(self, event):
   if event.key == 'shift':
       self.shift_is_held = True

def on_key_release(self, event):
   if event.key == 'shift':
       self.shift_is_held = False

然后，如果 self.shift_is_held ，则可以签入 onClick 函数.

Then you can check in your onClick function if self.shift_is_held.

if event.button == 3:
    if self.shift_is_held:
        do_something()
    else:
        do_something_else()

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