Python Tkinter旋转图像动画

Question

我有一个使用PIL创建并添加到TKinter画布的PhotoImage。图像显示正常。然而，我无法正确使用PIL的旋转函数。以下是我的代码：

 #This works fine
 image = Image.open('img.png')
 canvas_image = ImageTk.PhotoImage(rotated_image)
 canvas_object = canvas.create_image(30+10*int(steps),250, image=canvas_image)
 canvas.pack()

 #this does not work
 canvas.delete(canvas_object)
 rotated_image = image.rotate(1)
 canvas_image = ImageTk.PhotoImage(rotated_image)
 canvas_object = canvas.create_image(30+10*int(steps),250, image=canvas_image)
 canvas.update()

然而，在这种情况下，图像并没有显示出来。我想能够动画旋转图像，但是我甚至无法让旋转起作用！非常感谢任何建议。

编辑：更正，旋转在添加到屏幕后将无法起作用。

- Mason

Answer 1

下面是一个使用Python3旋转图像的示例:

import tkinter as tk
from PIL import ImageTk
from PIL import Image

class SimpleApp(object):
    def __init__(self, master, filename, **kwargs):
        self.master = master
        self.filename = filename
        self.canvas = tk.Canvas(master, width=500, height=500)
        self.canvas.pack()

        self.update = self.draw().__next__
        master.after(100, self.update)

    def draw(self):
        image = Image.open(self.filename)
        angle = 0
        while True:
            tkimage = ImageTk.PhotoImage(image.rotate(angle))
            canvas_obj = self.canvas.create_image(
                250, 250, image=tkimage)
            self.master.after_idle(self.update)
            yield
            self.canvas.delete(canvas_obj)
            angle += 10
            angle %= 360

root = tk.Tk()
app = SimpleApp(root, '/path/to/image.png')
root.mainloop()

如果需要 Python2 版本，请参阅修订历史记录。

- unutbu

Answer 2

以下是unutbu在Python 3中的答案:

import time
import tkinter
from PIL import Image, ImageTk

class SimpleApp(object):
    def __init__(self, master, filename, **kwargs):
        self.master = master
        self.filename = filename
        self.canvas = tkinter.Canvas(master, width=500, height=500)
        self.canvas.pack()

        self.process_next_frame = self.draw().__next__  # Using "next(self.draw())" doesn't work
        master.after(1, self.process_next_frame)

    def draw(self):
        image = Image.open(self.filename)
        angle = 0
        print(self.process_next_frame)
        while True:
            tkimage = ImageTk.PhotoImage(image.rotate(angle))
            canvas_obj = self.canvas.create_image(250, 250, image=tkimage)
            self.master.after_idle(self.process_next_frame)
            yield
            self.canvas.delete(canvas_obj)
            angle += 1
            angle %= 360
            time.sleep(0.002)

root = tkinter.Tk()
app = SimpleApp(root, 'images.png')
root.mainloop()

我花了一些时间才让它正常运作，所以我想分享一下。

- James