如何在画布上更新图像？

Question

这是我遇到麻烦的代码的本质：

camelot = Canvas(main, width = 400, height = 300)
camelot.grid(row = 0, column = 0, rowspan = 11, columnspan = 3)
MyImage = PhotoImage(file = "sample1.gif")
camelot.create_image(0, 0, anchor = NW, image = MyImage)

这是在开始的时候。稍后我想在另一个函数中做的是用"sample2.gif"替换"sample1.gif"，并且，可能稍后，依次用"sample3.gif"替换它。我卡住了，到目前为止，我一直在尝试的一切都没有奏效。

Answer 1

将图像添加到画布：

self.image_on_canvas = self.canvas.create_image(0, 0, image = ...)

更改图像：

self.canvas.itemconfig(self.image_on_canvas, image = ...)

---

完整示例：

from Tkinter import *

#----------------------------------------------------------------------

class MainWindow():

    #----------------

    def __init__(self, main):

        # canvas for image
        self.canvas = Canvas(main, width=60, height=60)
        self.canvas.grid(row=0, column=0)

        # images
        self.my_images = []
        self.my_images.append(PhotoImage(file = "ball1.gif"))
        self.my_images.append(PhotoImage(file = "ball2.gif"))
        self.my_images.append(PhotoImage(file = "ball3.gif"))
        self.my_image_number = 0

        # set first image on canvas
        self.image_on_canvas = self.canvas.create_image(0, 0, anchor = NW, image = self.my_images[self.my_image_number])

        # button to change image
        self.button = Button(main, text="Change", command=self.onButton)
        self.button.grid(row=1, column=0)

    #----------------

    def onButton(self):

        # next image
        self.my_image_number += 1

        # return to first image
        if self.my_image_number == len(self.my_images):
            self.my_image_number = 0

        # change image
        self.canvas.itemconfig(self.image_on_canvas, image = self.my_images[self.my_image_number])

#----------------------------------------------------------------------

root = Tk()
MainWindow(root)
root.mainloop()

示例中使用的图像：

ball1.gifball2.gifball3.gif

结果：

Answer 2

    MyImage = PhotoImage(file = "sample1.gif")
    labelorbuttontodisplayit.image = MyImage
    labelorbuttontodisplayit.configure(image=MyImage)

：p应该可以。我只想在标签或按钮上使用这些代码，从来没有将其用作画布，但我想您可以稍微修改一下这段代码。