Python 如何更新使用image.open（）打开的图像

我只是好奇，如果不用再次调用缩放功能，我将如何更新使用缩放功能打开的图像。另外，如果你知道任何更简单的方法来做我正在做的事情，这只是简单地试图使一个图像“缩放”与鼠标滚轮，那么我的耳朵是开放的lol。任何对代码的其他评论是感激的，谢谢

具体来说，这一部分就在这里：

pictureVar = StringVar()
pictureVar.set("a.png")

Zoom(root, path=pictureVar.get())

pictureVar.set("b.png")

然后在此处使用Image.open（）打开图片：

类缩放（帧）：
“使用鼠标滚轮进行简单缩放”
定义初始化（自身、大型机、路径）：
''初始化主框架''
帧。初始化（自，主=大型机）
#画布的垂直和水平滚动条
vbar=自动滚动条（self.master，orient='vertical'）
hbar=AutoScrollbar（self.master，orient='horizontal'）
vbar.grid（行=0，列=1，sticky='ns'）
grid（行=1，列=0，sticky='we'）
#开放图像
self.image=image.open（path）#请。你甚至没有提到你的代码转储的哪一部分是相关的…@Julien我很抱歉。。。我是新来的，我不常来这里，在编码方面也不是很有经验。如果有帮助，我会更新它。那么是什么阻止你创建一个
update\u image（self，path）
方法来实现这一点呢？
Zoom
不是一个函数，它是一个
类。调用类时，它会创建一个实例，并通过调用类“
\uuuu init\uuuu（）
方法对其进行初始化。实例值将成为第一个参数，通常称为
self
，它将自动传递给定义的
类的所有其他方法。如果将
图像
附加到
画布
，则您可以在以后根据需要使用
图像ID
更新
画布
。
class Zoom(Frame):
    ''' Simple zoom with mouse wheel '''
    def __init__(self, mainframe, path):
        ''' Initialize the main Frame '''
        Frame.__init__(self, master=mainframe)
        # Vertical and horizontal scrollbars for canvas
        vbar = AutoScrollbar(self.master, orient='vertical')
        hbar = AutoScrollbar(self.master, orient='horizontal')
        vbar.grid(row=0, column=1, sticky='ns')
        hbar.grid(row=1, column=0, sticky='we')
        # Open image
        self.image = Image.open(path)  #<------------------------!!!!!!!!!!!

import csv
import os
from tkinter import *
from PIL import ImageTk, Image

root = Tk()

class AutoScrollbar(Scrollbar):
    ''' A scrollbar that hides itself if it's not needed.
        Works only if you use the grid geometry manager '''
    def set(self, lo, hi):
        if float(lo) <= 0.0 and float(hi) >= 1.0:
            self.grid_remove()
        else:
            self.grid()
        Scrollbar.set(self, lo, hi)


class Zoom(Frame):
    ''' Simple zoom with mouse wheel '''
    def __init__(self, mainframe, path):
        ''' Initialize the main Frame '''
        Frame.__init__(self, master=mainframe)
        # Vertical and horizontal scrollbars for canvas
        vbar = AutoScrollbar(self.master, orient='vertical')
        hbar = AutoScrollbar(self.master, orient='horizontal')
        vbar.grid(row=0, column=1, sticky='ns')
        hbar.grid(row=1, column=0, sticky='we')
        # Open image
        self.image = Image.open(path)
        # Create canvas and put image on it
        self.canvas = Canvas(self.master, highlightthickness=0,
                                xscrollcommand=hbar.set, yscrollcommand=vbar.set)
        self.canvas.grid(row=0, column=0, sticky='nswe')
        vbar.configure(command=self.canvas.yview)  # bind scrollbars to the canvas
        hbar.configure(command=self.canvas.xview)
        # Make the canvas expandable
        self.master.rowconfigure(0, weight=1)
        self.master.columnconfigure(0, weight=1)
        # Bind events to the Canvas
        self.canvas.bind('<ButtonPress-1>', self.move_from)
        self.canvas.bind('<B1-Motion>',     self.move_to)
        self.canvas.bind('<MouseWheel>', self.wheel)
        self.imscale = 0.25
        self.imageid = None
        self.delta = 0.75
        # Text is used to set proper coordinates to the image. You can make it invisible.
        self.text = self.canvas.create_text(0, 0, anchor='nw', text='')
        self.show_image()
        self.canvas.configure(scrollregion=self.canvas.bbox('all'))

    def move_from(self, event):
        ''' Remember previous coordinates for scrolling with the mouse '''
        self.canvas.scan_mark(event.x, event.y)

    def move_to(self, event):
        ''' Drag (move) canvas to the new position '''
        self.canvas.scan_dragto(event.x, event.y, gain=1)

    def wheel(self, event):
        ''' Zoom with mouse wheel '''
        scale = 1.0
        # Respond to Linux (event.num) or Windows (event.delta) wheel event
        if event.num == 5 or event.delta == -120:
            scale        *= self.delta
            self.imscale *= self.delta
        if event.num == 5 or event.delta == 120:
            scale        /= self.delta
            self.imscale /= self.delta
        # Rescale all canvas objects
        x = self.canvas.canvasx(event.x)
        y = self.canvas.canvasy(event.y)
        self.canvas.scale('all', x, y, scale, scale)
        self.show_image()
        self.canvas.configure(scrollregion=self.canvas.bbox('all'))

    def show_image(self):
        ''' Show image on the Canvas '''
        if self.imageid:
            self.canvas.delete(self.imageid)
            self.imageid = None
            self.canvas.imagetk = None  # delete previous image from the canvas
        width, height = self.image.size
        new_size = int(self.imscale * width), int(self.imscale * height)
        imagetk = ImageTk.PhotoImage(self.image.resize(new_size))
        # Use self.text object to set proper coordinates
        self.imageid = self.canvas.create_image(self.canvas.coords(self.text),
                                                anchor='nw', image=imagetk)
        self.canvas.lower(self.imageid)  # set it into background
        self.canvas.imagetk = imagetk  # keep an extra reference to prevent garbage-collection


pictureVar = StringVar()
pictureVar.set("a.png")

Zoom(root, path=pictureVar.get())

pictureVar.set("b.png")

mainloop()