python 实现图片裁剪小工具

# -*- encoding=utf-8 -*-
import os
import tkinter as tk

from PIL import Image
from PIL import ImageTk

left_mouse_down_x = 0
left_mouse_down_y = 0
left_mouse_up_x = 0
left_mouse_up_y = 0
sole_rectangle = None


def left_mouse_down(event):
  # print("鼠标左键按下")
  global left_mouse_down_x, left_mouse_down_y
  left_mouse_down_x = event.x
  left_mouse_down_y = event.y


def left_mouse_up(event):
  # print("鼠标左键释放")
  global left_mouse_up_x, left_mouse_up_y
  left_mouse_up_x = event.x
  left_mouse_up_y = event.y
  corp_img(img_path, "img/one_corp.png", left_mouse_down_x, left_mouse_down_y,
       left_mouse_up_x, left_mouse_up_y)


def moving_mouse(event):
  # print("鼠标左键按下并移动")
  global sole_rectangle
  global left_mouse_down_x, left_mouse_down_y
  moving_mouse_x = event.x
  moving_mouse_y = event.y
  if sole_rectangle is not None:
    canvas.delete(sole_rectangle) # 删除前一个矩形
  sole_rectangle = canvas.create_rectangle(left_mouse_down_x, left_mouse_down_y, moving_mouse_x,
                       moving_mouse_y, outline="red")


def right_mouse_down(event):
  # print("鼠标右键按下")
  pass


def right_mouse_up(event):
  # print("鼠标右键释放")
  pass


def corp_img(source_path, save_path, x_begin, y_begin, x_end, y_end):
  if x_begin < x_end:
    min_x = x_begin
    max_x = x_end
  else:
    min_x = x_end
    max_x = x_begin
  if y_begin < y_end:
    min_y = y_begin
    max_y = y_end
  else:
    min_y = y_end
    max_y = y_begin
  save_path = os.path.abspath(save_path)
  if os.path.isfile(source_path):
    corp_image = Image.open(source_path)
    region = corp_image.crop((min_x, min_y, max_x, max_y))
    region.save(save_path)
    print("裁剪完成,保存于:{}".format(save_path))
  else:
    print("未找到文件:{}".format(source_path))


if __name__ == "__main__":
  pass
  win = tk.Tk()
  frame = tk.Frame()
  frame.pack()
  screenwidth = win.winfo_screenwidth()
  screenheight = win.winfo_screenheight()
  img_path = "img/one.png"
  # img_path = "img/bg.jpg"
  # img_path = "img/test.jpg"
  # img_path = "img/pic.gif"
  image = Image.open(img_path)
  image_x, image_y = image.size
  if image_x > screenwidth or image_y > screenheight:
    print("The picture size is too big,max should in:{}x{}, your:{}x{}".format(screenwidth,
                                          screenheight,
                                          image_x,
                                          image_y))
  img = ImageTk.PhotoImage(image)
  canvas = tk.Canvas(frame, width=image_x, height=image_y, bg="pink")
  i = canvas.create_image(0, 0, anchor="nw", image=img)
  canvas.pack()
  canvas.bind("<Button-1>", left_mouse_down) # 鼠标左键按下
  canvas.bind("<ButtonRelease-1>", left_mouse_up) # 鼠标左键释放
  canvas.bind("<Button-3>", right_mouse_down) # 鼠标右键按下
  canvas.bind("<ButtonRelease-3>", right_mouse_up) # 鼠标右键释放
  canvas.bind("<B1-Motion>", moving_mouse) # 鼠标左键按下并移动
  win.mainloop()