import matplotlib.pyplot as plt
def on_key_press(event):
print(event.key)
fig, ax = plt.subplots()
fig.canvas.mpl_connect('key_press_event', on_key_press)
plt.show()
这段程序的功能是响应键盘按键，print按键的值
mpl_connect的参数：
参数
意义
‘button_press_event’
按下鼠标
‘button_release_event’
释放鼠标
‘draw_event’
界面重新绘制
‘key_press_event’
按下键盘
‘key_release_event’
释放键盘
‘motion_notify_event’
鼠标移动
‘pick_event’
鼠标点选绘图对象
‘resize_event’
‘scroll_event’
鼠标滚轴事件
‘figure_enter_event’
鼠标进入figure
‘figure_leave_event’
鼠标离开figure
‘axes_enter_event’
鼠标进入Axes
‘axes_leave_event’
鼠标离开Axes
‘close_event’
关闭图表
查询已经注册的响应函数
fig.canvas.callbacks.callbacks
- 1
程序示例：键盘控制颜色
import matplotlib.pyplot as plt
import numpy as np
def on_key_press(event):
if event.key in 'rgbcmyk':
line.set_color(event.key)
fig.canvas.draw_idle()#重新绘制整个图表，
fig, ax = plt.subplots()
x = np.linspace(0, 10, 1000)
y = np.sin(x)
line = ax.plot(x, y)[0]
fig.canvas.mpl_disconnect(fig.canvas.manager.key_press_handler_id)#取消默认快捷键的注册
fig.canvas.mpl_connect('key_press_event', on_key_press)
plt.show()
这里有两个点：
1. fig.canvas.draw_idle()重新绘制整个图表
2. fig.canvas.mpl_disconnect()取消已经注册的响应函数。这里是为了取消默认快捷键
程序示例
import matplotlib.pyplot as plt
fig, ax = plt.subplots()
text = ax.text(0.5, 0.5, 'event', ha='center', va='center', fontdict={'size': 20})
def call_back(event):
info = 'name:{}\n button:{}\n x,y:{},{}\n xdata,ydata:{}{}'.format(event.name, event.button,event.x, event.y,event.xdata, event.ydata)
text.set_text(info)
fig.canvas.draw_idle()
fig.canvas.mpl_connect('button_press_event', call_back)
fig.canvas.mpl_connect('button_release_event', call_back)
fig.canvas.mpl_connect('motion_notify_event', call_back)
plt.show()
功能不多解释，仔细读读代码
