Python Matplotlib/tkinter:图例上的事件拾取
我在修改这段代码时遇到了问题,因此可以通过单击图例在tkinter中选择一行。我想从这个角度修改代码 这是我到目前为止提出的代码。它只是在tkinter中绘制线条Python Matplotlib/tkinter:图例上的事件拾取,python,matplotlib,tkinter,Python,Matplotlib,Tkinter,我在修改这段代码时遇到了问题,因此可以通过单击图例在tkinter中选择一行。我想从这个角度修改代码 这是我到目前为止提出的代码。它只是在tkinter中绘制线条 import tkinter as tk from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg from matplotlib.figure import Figure class Main: def __init__(self, master):
import tkinter as tk
from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg
from matplotlib.figure import Figure
class Main:
def __init__(self, master):
self.master = master
master.title("A simple GUI")
plotFrame = tk.Frame(master)
plotFrame.pack()
f = Figure(figsize=(5,4),dpi=100)
self.ax = f.add_subplot(111)
self.canvas = FigureCanvasTkAgg(f,master=plotFrame)
self.canvas.show()
self.canvas.get_tk_widget().pack()
line1, = self.ax.plot(t, y1, lw=2, color='red', label='1 HZ')
line2, = self.ax.plot(t, y2, lw=2, color='blue', label='2 HZ')
leg = self.ax.legend(loc='upper left', fancybox=True, shadow=True)
leg.get_frame().set_alpha(0.4)
def onpick(event):
# on the pick event, find the orig line corresponding to the
# legend proxy line, and toggle the visibility
legline = event.artist
origline = lined[legline]
vis = not origline.get_visible()
origline.set_visible(vis)
# Change the alpha on the line in the legend so we can see what lines
# have been toggled
if vis:
legline.set_alpha(1.0)
else:
legline.set_alpha(0.2)
fig.canvas.draw()
fig.canvas.mpl_connect('pick_event', onpick)
plt.show()
root = tk.Tk()
my_gui = Main(root)
root.mainloop()
为了编写应用程序,您需要更好地使用面向对象的结构。特别是:
1-将代码保存在类的方法中:
# In your example, the following lines are outside any method
fig.canvas.mpl_connect('pick_event', onpick)
plt.show()
2-使用自变量存储要以不同方法访问的对象:
# Add self as the first argument in onpick()
def onpick(self, event):
(...)
# Now you can access self.canvas defined in __init__()
self.canvas.draw()
请参见以下代码的工作版本:
import tkinter as tk
from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg
from matplotlib.figure import Figure
import numpy as np
t = np.arange(0.0, 0.2, 0.1)
y1 = 2*np.sin(2*np.pi*t)
y2 = 4*np.sin(2*np.pi*2*t)
class Main:
def __init__(self, master):
self.master = master
master.title("A simple GUI")
plotFrame = tk.Frame(master)
plotFrame.pack()
f = Figure(figsize=(5,4),dpi=100)
self.ax = f.add_subplot(111)
self.canvas = FigureCanvasTkAgg(f, master=plotFrame)
self.canvas.show()
self.canvas.get_tk_widget().pack()
self.canvas.mpl_connect('pick_event', self.onpick)
line1, = self.ax.plot(t, y1, lw=2, color='red', label='1 HZ')
line2, = self.ax.plot(t, y2, lw=2, color='blue', label='2 HZ')
leg = self.ax.legend(loc='upper left', fancybox=True, shadow=True)
leg.get_frame().set_alpha(0.4)
# we will set up a dict mapping legend line to orig line, and enable
# picking on the legend line
lines = [line1, line2]
self.lined = dict()
for legline, origline in zip(leg.get_lines(), lines):
legline.set_picker(5) # 5 pts tolerance
self.lined[legline] = origline
def onpick(self, event):
# on the pick event, find the orig line corresponding to the
# legend proxy line, and toggle the visibility
legline = event.artist
origline = self.lined[legline]
vis = not origline.get_visible()
origline.set_visible(vis)
# Change the alpha on the line in the legend so we can see what lines
# have been toggled
if vis:
legline.set_alpha(1.0)
else:
legline.set_alpha(0.2)
self.canvas.draw()
root = tk.Tk()
my_gui = Main(root)
root.mainloop()
我不明白这个问题。在您链接到的示例中,在pick上有一个函数,并且注册了一个“pick”事件。由于代码中完全没有这些部分,因此它当然不会显示所需的效果。你需要包括它们,如果你有问题,显示重现这个问题的代码。我已经编辑了代码,以显示我会做什么。如果代码是从python运行的,那么可以打开和关闭代码行。如果我运行此命令,则无法在tkinter窗口中打开或关闭这些行。请注意缩进。还有5个以上的未定义变量。在问题中发布代码后,请验证是否可以复制并运行该代码,以重现您所询问的不希望出现的行为。感谢Josselin的帮助!非常感谢你的建议