實現：tkinter 畫布上顯示圖片，按下滑鼠左鍵並且移動，實現截圖

程式碼如下

# -*- 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('滑鼠左鍵按下')
  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('滑鼠左鍵釋放')
  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('滑鼠左鍵按下並移動')
  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) # 刪除前一個矩形
  sole_rectangle = canvas.create_rectangle(left_mouse_down_x,moving_mouse_x,moving_mouse_y,outline='red')


def right_mouse_down(event):
  # print('滑鼠右鍵按下')
  pass


def right_mouse_up(event):
  # print('滑鼠右鍵釋放')
  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,保存於:{}'.format(save_path))
  else:
    print('未找到檔案:{}'.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,anchor='nw',image=img)
  canvas.pack()
  canvas.bind('<Button-1>',left_mouse_down) # 滑鼠左鍵按下
  canvas.bind('<ButtonRelease-1>',left_mouse_up) # 滑鼠左鍵釋放
  canvas.bind('<Button-3>',right_mouse_down) # 滑鼠右鍵按下
  canvas.bind('<ButtonRelease-3>',right_mouse_up) # 滑鼠右鍵釋放
  canvas.bind('<B1-Motion>',moving_mouse) # 滑鼠左鍵按下並移動
  win.mainloop()

原圖one.png

執行

one_corp.png

原始碼（https://github.com/rainbow-tan/rainbow/tree/master/%E8%A3%81%E5%89%AA%E5%9B%BE%E7%89%87）

以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支援我們。