Python tkinter 实现另存为图片

要在Python tkinter中实现另存为图片功能，可以使用Python Imaging Library（PIL）。

首先，导入必要的库：

from tkinter import *
from tkinter import filedialog
from PIL import Image, ImageDraw

然后，创建一个画布并绘制一些形状：

# 创建画布
canvas_width = 400
canvas_height = 400
canvas = Canvas(root, width=canvas_width, height=canvas_height, bg='white')
canvas.pack()

# 绘制一个圆形和一个矩形
canvas.create_oval(50, 50, 150, 150, fill='red')
canvas.create_rectangle(200, 200, 300, 300, fill='blue')

接下来，定义一个函数来保存画布中的内容为图片：

def save_canvas():
    # 获取画布截图
    x = root.winfo_rootx() + canvas.winfo_x()
    y = root.winfo_rooty() + canvas.winfo_y()
    x1 = x + canvas.winfo_width()
    y1 = y + canvas.winfo_height()
    image = ImageGrab.grab((x, y, x1, y1))

    # 弹出文件对话框，选择保存位置和文件名
    file_path = filedialog.asksaveasfilename(defaultextension='.png')
    if file_path:
        image.save(file_path)

最后，创建一个按钮来触发保存函数：

# 创建按钮
save_btn = Button(root, text='Save as Image', command=save_canvas)
save_btn.pack()

完整代码如下：

from tkinter import *
from tkinter import filedialog
from PIL import Image, ImageDraw, ImageGrab

root = Tk()
root.title('Save Canvas as Image')
root.geometry('400x450')

# 创建画布
canvas_width = 400
canvas_height = 400
canvas = Canvas(root, width=canvas_width, height=canvas_height, bg='white')
canvas.pack()

# 绘制一个圆形和一个矩形
canvas.create_oval(50, 50, 150, 150, fill='red')
canvas.create_rectangle(200, 200, 300, 300, fill='blue')

def save_canvas():
    # 获取画布截图
    x = root.winfo_rootx() + canvas.winfo_x()
    y = root.winfo_rooty() + canvas.winfo_y()
    x1 = x + canvas.winfo_width()
    y1 = y + canvas.winfo_height()
    image = ImageGrab.grab((x, y, x1, y1))

    # 弹出文件对话框，选择保存位置和文件名
    file_path = filedialog.asksaveasfilename(defaultextension='.png')
    if file_path:
        image.save(file_path)

# 创建按钮
save_btn = Button(root, text='Save as Image', command=save_canvas)
save_btn.pack()

root.mainloop()