python-3.x - 使用鼠标在 python tkinter Canvas 上绘制并获取指向列表的点？

Question

我正在使用 tkinter 开发 Python 应用程序。我想做的是在 Canvas 坐标上绘制，这些点将被记录到一个列表中，以便我稍后进行计算。
如果不可能，您会推荐任何其他可以做到这一点的工具或 GUI 平台吗？

编辑:到目前为止，我所拥有的是一个可以从列表中获取点并在 Canvas 上绘制的应用程序。我也想要相反的工作方式。

from tkinter import *
from tkinter.filedialog import askopenfilename
from tkinter.messagebox import showerror
from tkinter import ttk
import tkinter
import threading

another_points = []

class Waveform(Frame):
   def __init__(self, master):
      ttk.Frame.__init__(self, master)
      self.master = master

      self.points = [10, 20, 30]
      self.create_widget()

   def create_widget(self):

      self.LoadFrame = ttk.LabelFrame(self.master, text = "Load")
      self.LoadFrame.pack(side = "left", padx = 10, pady = 10)
      self.PlotFrame()

      self.anotherFrame = ttk.LabelFrame(self.LoadFrame, text = "Browse")
      self.anotherFrame.pack(fill = "both", padx = 10, pady = 10)
      self.OpenFileButton = ttk.Button(self.anotherFrame, text = "Browse", command = self.load_file)
      self.OpenFileButton.grid(row = 0, column = 0)

   def load_file(self):
      fname = askopenfilename(filetypes = (("Text files", "*.txt"), ("All files", "*.*")))
      another_points[:] = []
      self.points[:] = []
      if fname:
         try:
            print (fname)
            with open(fname) as f:
               for line in f:
                  another_points.append(float(line.rstrip()))

            self.points = another_points

         except:
            print ("Error")
         return


   def PlotFrame(self):
      self.PlotFrame = ttk.LabelFrame(self.master, text = "X/Y Coordinates")
      self.PlotFrame.pack(side = LEFT, padx = 10, pady = 10)

      self.width = 400
      self.height = 350
      self.pressure = 75
      self.x_increment = 1
      self.x_factor = 0.04
      self.y_amplitude = 80


      def draw():
         self.GraphFrame.delete(self.sin_line)
         self.xy1 = []
         self.xy2 = self.points
         for x in range(len(self.xy2)):
            self.xy1.append(x + 25)
            self.xy1.append(self.height - self.xy2[x])

         self.sin_line = self.GraphFrame.create_line(self.xy1, fill = "yellow")

      self.UpdateButton = ttk.Button(self.PlotFrame, text = "Update", command = draw)
      self.UpdateButton.pack()

      self.GraphFrame = Canvas(self.PlotFrame, width = self.width, height = self.height, bg = "black")

      self.GraphFrame.pack()
      self.original = []

      self.mock = [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]
      for x in range(len(self.mock)):
         self.original.append((x + 5)*10)
         self.original.append((self.height - self.mock[x])/100)

      self.sin_line = self.GraphFrame.create_line(self.original, fill = "yellow")


if __name__ == "__main__":
    master = Tk()
    Waveform(master).pack(side = "top", fill ="both", expand = True)
    master.mainloop()

-谢谢

Answer 1

从...开始

import tkinter as tk
root = tk.Tk()
def mmove(event):
    print(event.x, event.y)
root.bind('<Motion>', mmove)
root.mainloop()

然后按照你的意愿进行详细说明。将运动绑定(bind)到 Canvas 、在 Canvas 上绘制点、将对附加到列表、绑定(bind)点击代替或附加、过滤点流等。