思想家Matplotlib畫布圖上的多個滑鼠選擇事件錯誤

我對這里很陌生，請與我裸露。使用“顯示多邊形按鈕”，我在思想家畫布中生成了 2 個 Matplotlib 圖，包括一個多邊形圖和一個散點圖。我想要一個 2 個單獨的滑鼠拾取事件來從多邊形（藍色）和散點（橙色）獲取坐標。它們（拾取事件）似乎可以正常作業，但是當我嘗試同時運行這兩個事件時出現錯誤，因為 Matplotlib 選擇器事件會干擾其他事件。
我感謝您的幫助。代碼如下：

import numpy as np
import pandas as pd
from pandastable import Table
from shapely.geometry import Polygon
import matplotlib
from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg
from matplotlib.figure import Figure
import matplotlib.pyplot as plt

import tkinter as tk
from tkinter import ttk as ttk





matplotlib.use('TkAgg')


root = tk.Tk()
root.geometry('700x400')
root.state('zoomed')

df2 = pd.DataFrame({
    'x': [0,100,100,-100,-100,0,],
    'y': [0,0,500,500,0,0,],
})

df= pd.DataFrame()

frame = tk.Frame(root)
frame.place(x=500, y=500)
pt = Table(frame, dataframe=df, width=150,height=400)
pt.show()

class App():
    def __init__(self, master):
        self.master = master
          
        self.points = []
        self.pointSelect = None
        self.dotSelect=None
             
        # Frame 
        self.frame =tk.Frame(master, width=400, height =950,highlightbackground="blue", highlightthickness=5)
        self.frame.place(x=10, y=40)
        

        # button 
        self.button = tk.Button(self.frame,text = "Show Polygon", command=self.plot_section, width =15, height =2 )
        self.button.place (x=30, y=150)     
  
          

        
    def plot_section(self):
        pt.model.df = df2 # writing into pd data frame 
        pt.redraw()
             
        poly_new=list(tuple(map(tuple,np.asarray(df2))))
        print(poly_new)
        polygon2 = Polygon(poly_new)
        self.x,self.y = polygon2.exterior.xy       
        fig.clear()
        ax=fig.add_subplot(111)
        self.x2=(0,50)
        self.y2=(110,110)
        ax.plot(self.x,self.y, color ='blue',picker=True, pickradius=5)
        ax.scatter(self.x2, self.y2, s=32, color ='orange',picker=True)
        canvas.draw_idle()
        
        print(pt.model.df)
               
        def onpick(event):
 
            thisline = event.artist
            xdata = thisline.get_xdata()
            ydata = thisline.get_ydata()
            ind = event.ind
            print(xdata[ind][0] )
            self.points=[]
            self.points.append([xdata[ind][0], ydata[ind][0]])
            print('this point click on polygon', self.points)
            

        def onpick2(event):
        #This function is called whenever a point on the Tkinter Canvas is Clicked
            index = event.ind
            xy = event.artist.get_offsets()
            print ('hi scatter',xy[index])


        self.pointSelect=fig.canvas.mpl_connect('pick_event', onpick)
        self.dotSelects=fig.canvas.mpl_connect('pick_event', onpick2)
        

fig = Figure(figsize=(8,6), dpi=100)
canvas = FigureCanvasTkAgg(fig, master=root)
canvas.draw()
canvas.get_tk_widget().pack(side=tk.RIGHT)

        
app = App(root)
root.mainloop()

錯誤訊息 1：（最近一次呼叫最后一次）：檔案“C:\Users\xxx\Anaconda3\envs\pls\lib\site-packages\matplotlib\cbook_ init _.py”，第 287 行，處理中 func(*args , **kwargs) 檔案“C:\Users\xxx\AppData\Local\Temp\ipykernel_39168\1909536620.py”，第 77 行，onpick xdata = thisline.get_xdata() AttributeError: 'PathCollection' 物件沒有屬性 'get_xdata '

錯誤訊息 2：（最近一次呼叫最后一次）：檔案“C:\Users\xxxxx\lib\site-packages\matplotlib\cbook_ init _.py”，第 287 行，正在處理 func(*args, **kwargs) 檔案“C:\Users\xxxx\AppData\Local\Temp\ipykernel_39168\1909536620.py”，第 89 行，onpick2 xy = event.artist.get_offsets() AttributeError: 'Line2D' 物件沒有屬性 'get_offsets'

uj5u.com熱心網友回復：

event不在乎你點擊了什么。當您單擊畫布上的物件時，它會運行這兩個功能。

并且不同的物件具有不同的功能，您應該檢查instance為event.artist單擊的物件運行正確的代碼。

def onpick(event):
    print('onpick', event.artist)
    
    if isinstance(event.artist, matplotlib.lines.Line2D):
        thisline = event.artist
        xdata = thisline.get_xdata()
        ydata = thisline.get_ydata()
        ind = event.ind
        print(xdata[ind][0])
        self.points = []
        self.points.append([xdata[ind][0], ydata[ind][0]])
        print('this point click on polygon', self.points)

def onpick2(event):
    print('onpick2', event.artist)

    if isinstance(event.artist, matplotlib.collections.PathCollection):
        index = event.ind
        xy = event.artist.get_offsets()
        print ('hi scatter', xy[index])

您甚至可以將所有功能放在一個功能中。

def onpick(event):
    print('onpick', event.artist)
    
    if isinstance(event.artist, matplotlib.lines.Line2D):
        thisline = event.artist
        xdata = thisline.get_xdata()
        ydata = thisline.get_ydata()
        ind = event.ind
        print(xdata[ind][0])
        self.points = []
        self.points.append([xdata[ind][0], ydata[ind][0]])
        print('this point click on polygon', self.points)

    if isinstance(event.artist, matplotlib.collections.PathCollection):
        index = event.ind
        xy = event.artist.get_offsets()
        print ('hi scatter', xy[index])

標籤：Python matplotlib tkinter

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