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python - 按下键盘键时，Tkinter 无法关闭图像

问题描述

这里的目标是在图像上使用 tkinter 绘制一个矩形，然后按空格键并关闭图像，但是按空格时我无法关闭窗口。

我这样做是为了进行心理学实验，最近我必须将这张图片保存在一个文件夹中，如果不是太多要求，如果你也能帮助我解决这个问题，我将非常感激......对不起

import tkinter as tk 
from tkinter import *
from PIL import Image, ImageTk
import sys


class ExampleApp(tk.Tk):
    def __init__(self):
        tk.Tk.__init__(self)
        self.x = self.y = 0
        self.canvas = tk.Canvas(self, width=512, height=720, cursor="cross")
        self.canvas.pack(side="top", fill="both", expand=True)
        self.canvas.bind("<ButtonPress-1>", self.on_button_press)
        self.canvas.bind("<B1-Motion>", self.on_move_press)
        self.canvas.bind("<ButtonRelease-1>", self.on_button_release)
        self.rect = None
        self.start_x = None
        self.start_y = None
        self._draw_image()

#   Space to destroy 
        self.canvas.bind("<space>", self.on_space_press)   

    def _draw_image(self):
         self.im = Image.open('./EFCTupright_04203d903.jpg')
         self.tk_im = ImageTk.PhotoImage(self.im)
         self.canvas.create_image(0,0,anchor="nw",image=self.tk_im)

#  Destroy image: 
    def on_space_press(self, event):
        app.destroy()

    def on_button_press(self, event):
        # save mouse drag start position
        self.start_x = event.x
        self.start_y = event.y

        # create rectangle if not yet exist
        #if not self.rect:
        self.rect = self.canvas.create_rectangle(self.x, self.y, 2, 2, fill="", outline="red")

    def on_move_press(self, event):
        curX, curY = (event.x, event.y)

        # expand rectangle as you drag the mouse
        self.canvas.coords(self.rect, self.start_x, self.start_y, curX, curY)


    def on_button_release(self, event):
        pass



if __name__ == "__main__":
    app = ExampleApp()
    app.mainloop()

提前致谢

标签： pythontkinter

解决方案

我编辑了你的代码。

代替

self.canvas.bind("<space>", self.on_space_press)

采用

self.bind("<space>", self.on_space_press)

我还在您的代码中添加了保存功能

def save_file(self):
    # This will draw a rectangle on the image
    self.draw.rectangle( self.rec_coords, outline=self.outline_color)

    # Name of the file and format you want to save as
    self.im.save("out_put.jpg","JPEG")

完整代码

import tkinter as tk 
from tkinter import *
from PIL import Image, ImageTk, ImageDraw
import sys

class ExampleApp(tk.Tk):
    def __init__(self):
        tk.Tk.__init__(self)
        self.x = self.y = 0
        self.canvas = tk.Canvas(self, width=512, height=720, cursor="cross", highlightthickness=0)
        self.canvas.pack(side="top", fill="both", expand=True)
        self.update()
        self.canvas.bind("<ButtonPress-1>", self.on_button_press)
        self.canvas.bind("<B1-Motion>", self.on_move_press)
        self.canvas.bind("<ButtonRelease-1>", self.on_button_release)
        self.rect = None
        self.start_x = None
        self.start_y = None
        self.outline_color = "red"
        self._draw_image()

        # Space to destroy 
        self.bind("<space>", self.on_space_press)   

    def _draw_image(self):
        self.im = Image.open('./EFCTupright_04203d903.jpg').resize((self.winfo_reqwidth(), self.winfo_reqheight()))
        self.tk_im = ImageTk.PhotoImage(self.im)
        self.draw = ImageDraw.Draw(self.im)
        self.canvas.create_image(0,0,anchor="nw",image=self.tk_im)

    # Destroy image: 
    def on_space_press(self, event):
        self.save_file()
        self.destroy()

    def on_button_press(self, event):
        # save mouse drag start position
        self.start_x = event.x
        self.start_y = event.y

        # create rectangle if not yet exist
        #if not self.rect:
        self.rect = self.canvas.create_rectangle(self.x, self.y, 0, 0, outline=self.outline_color, tag="rect")

    def on_move_press(self, event):
        curX, curY = (event.x, event.y)
        # expand rectangle as you drag the mouse
        self.canvas.coords(self.rect, self.start_x, self.start_y, curX, curY)

    def on_button_release(self, event):
        pass

    def save_file(self):
        # This will draw a rectangle on the image
        for rect in self.canvas.find_withtag("rect"):
            self.draw.rectangle( self.canvas.coords(rect), outline=self.outline_color)

        # Name of the file and format you want to save as
        self.im.save("out_put.jpg","JPEG")


if __name__ == "__main__":
    app = ExampleApp()
    app.mainloop()

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