我有几个图表想要在按下按钮时显示。为此,我将plt.Figure
和FigureCanvasTkAgg
变量设为全局,并且每次按下按钮时只需擦除轴ax.clear()
。之后,我使用Figure.canvas.mpl_connect
以下方法添加了一个功能:当我按下图形区域时,第二个点用垂直线突出显示。当我打印一些简单的输出(在我的例子中,print('Vertical Line Constructed')
在select_trade_with_mouse
函数中)时,结果是为每个构建和删除的图形创建了事件:当我生成一个图形并按下图形(生成事件)时,然后print('Vertical Line Constructed')
只执行一次。如果我生成第二个图形并单击图形,则print('Vertical Line Constructed')
被执行两次。看起来旧图没有被破坏,点击图会为内存中的每个图生成一个事件,即使它没有显示。我试过plt.cla()
,plt.clf()
和plt.close()
,但它们都没有完全删除图形。
我的问题是,如何正确删除旧图表?所以点击图表只会产生一个事件?
我的代码:
import pandas as pd
import tkinter as tk
import matplotlib.pyplot as plt
import numpy as np
from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg
def select_trade_with_mouse(event, ax, graph, data):
global vertical_line_trading
print('Vertical Line Constructed')
if vertical_line_trading:
vertical_line_trading.remove()
del vertical_line_trading
vertical_line_trading = ax.axvline(data, color='b')
graph.draw()
def construct_graph(change_by = 0):
global data
global graph_index
print('Graph Constructed')
graph_index = graph_index + change_by
ax.clear()
#plt.close('all')
line = data[graph_index].plot(x='x', y='y', linestyle='-', ax=ax, linewidth=1, color='y')
click_id = figure.canvas.mpl_connect('button_press_event', lambda event: select_trade_with_mouse(event, ax, graph, data[graph_index].loc[1, 'x']))
graph.draw()
if __name__ == '__main__':
vertical_line_trading = None
graph_index = 0
## Some random data
data = []
for i in range(10):
data.append(pd.DataFrame({'x': [1+i, 2+i, 3+2*i], 'y': [1+2*i, 2+i, 3+i]}))
root = tk.Tk()
main_frame = tk.Frame(root, height=600, width=1200)
graph_frame = tk.Frame(main_frame, height=500, width=1200)
## Graph
figure = plt.Figure(figsize=(10,10), dpi=100)
ax = figure.add_subplot(111)
graph = FigureCanvasTkAgg(figure, graph_frame)
graph.get_tk_widget().pack(side=tk.LEFT)
## Buttons to switch between graphs
prev_graph_button = tk.Button(graph_frame, command = lambda: construct_graph(-1), height=10, width=10, text='Prev\nGraph')
next_graph_button = tk.Button(graph_frame, command = lambda: construct_graph(1), height=10, width=10, text='Next\nGraph')
prev_graph_button.pack(side=tk.LEFT)
next_graph_button.pack(side=tk.LEFT)
for frame in [main_frame, graph_frame]:
frame.pack(side=tk.BOTTOM, fill='both')
frame.pack_propagate(0)
root.mainloop()
您不必删除图形。您mpl_connect()
只需在开始时使用一次,而在清除图形时不能一次又一次地使用。
或者你必须保持click_id
在全局变量中并使用mpl_disconnect(click_id)
之前click_id = mpl_connect()
我click_id = None
在开始时创建全局变量,稍后如果不是,则construct_graph()
删除前一个。这种方式图只分配了一个功能click_id
None
import pandas as pd
import tkinter as tk
import matplotlib.pyplot as plt
import numpy as np
from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg
def select_trade_with_mouse(event, ax, graph, data):
global vertical_line_trading
print('Vertical Line Constructed')
if vertical_line_trading:
vertical_line_trading.remove()
del vertical_line_trading
vertical_line_trading = ax.axvline(data, color='b')
graph.draw()
def construct_graph(change_by = 0):
global data
global graph_index
global click_id
print('Graph Constructed')
graph_index = graph_index + change_by
ax.clear()
#plt.close('all')
line = data[graph_index].plot(x='x', y='y', linestyle='-', ax=ax, linewidth=1, color='y')
# if function exist then remove it
if click_id: # if click_id is not None:
figure.canvas.mpl_disconnect(click_id)
click_id = figure.canvas.mpl_connect('button_press_event', lambda event: select_trade_with_mouse(event, ax, graph, data[graph_index].loc[1, 'x']))
graph.draw()
if __name__ == '__main__':
click_id = None # create global varaible with default value at start
vertical_line_trading = None
graph_index = 0
## Some random data
data = []
for i in range(10):
data.append(pd.DataFrame({'x': [1+i, 2+i, 3+2*i], 'y': [1+2*i, 2+i, 3+i]}))
root = tk.Tk()
main_frame = tk.Frame(root, height=600, width=1200)
graph_frame = tk.Frame(main_frame, height=500, width=1200)
## Graph
figure = plt.Figure(figsize=(10,10), dpi=100)
ax = figure.add_subplot(111)
graph = FigureCanvasTkAgg(figure, graph_frame)
graph.get_tk_widget().pack(side=tk.LEFT)
## Buttons to switch between graphs
prev_graph_button = tk.Button(graph_frame, command = lambda: construct_graph(-1), height=10, width=10, text='Prev\nGraph')
next_graph_button = tk.Button(graph_frame, command = lambda: construct_graph(1), height=10, width=10, text='Next\nGraph')
prev_graph_button.pack(side=tk.LEFT)
next_graph_button.pack(side=tk.LEFT)
for frame in [main_frame, graph_frame]:
frame.pack(side=tk.BOTTOM, fill='both')
frame.pack_propagate(0)
root.mainloop()
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