我在tkinter中创建了一个与Photoshop类似的裁剪工具。此代码具有应该在裁剪框内裁剪可移动图像的功能（2英寸x 2英寸，护照尺寸等）。问题是，代码经常在框外部裁剪部分图像。
例如，如果我有一个肖像并将脸部对准矩形，则代码会裁剪帽子，或者除了脸部以外的任何地方。
我尝试使用bbox，事件对象等，但测量结果错误。请帮我。感谢。
这是部分代码。对不起，如果它很长。
from tkinter import *
from tkinter import ttk
import tkinter as tk
from tkinter import messagebox
from tkinter.filedialog import askopenfilename, asksaveasfilename
from PIL import Image, ImageTk
class PictureEditor:
# Quits when called
@staticmethod
# Opens an image
def open_app(self, event=None):
self.canvas.delete(ALL)
# Opens a window to choose a file=
self.openfile = askopenfilename(initialdir = # "Filename here")
if self.openfile:
with open(self.openfile) as _file:
# if file is selected by user, I'm going to delete
# the contents inside the canvas widget
self.canvas.delete(1.0, END)
self.im = Image.open(self.openfile)
self.image = ImageTk.PhotoImage(self.im)
self.a1 = self.canvas.create_image(0, 0, anchor=NW,
image=self.image, tags="image")
self.image_dim = self.canvas.bbox(self.a1)
self.imx = self.image_dim[0]
self.imy = self.image_dim[1]
# updating text widget
window.update_idletasks()
def on_drag(self, event):
# record the item and its location
self._drag_data["item"] = self.canvas.find_closest(event.x, event.y)[0]
self._drag_data["x"] = event.x
self._drag_data["y"] = event.y
self.origx = event.x
self.origy = event.y
def on_release(self, event):
# when I release the mouse, this happens
# reset the drag information
self._drag_data["item"] = None
self._drag_data["x"] = 0
self._drag_data["y"] = 0
self.newx = event.x
self.newy = event.y
# Measures mouse movement from one point to another
self.movex = self.origx - self.newx
self.movey = self.origy - self.newy
def on_motion(self, event):
# handles the dragging of an object
# compute how much the mouse has moved
delta_x = event.x - self._drag_data["x"]
delta_y = event.y - self._drag_data["y"]
# move the object the appropriate amount
self.canvas.move(self._drag_data["item"], delta_x, delta_y)
# record the new position
self._drag_data["x"] = event.x
self._drag_data["y"] = event.y
def draw(self, event, x1=None, y1=None,x2=None,y2=None):
# deleting contents of border, if any.
try:
self.canvas.delete(self.border)
except:
pass
# if an item is selected
selection = self.combo.get()
if selection == 'No Crop':
x1, y1, x2, y2 = None, None, None, None
if selection == '2 in x 2 in':
x1, y1, x2, y2 = self.imx, self.imy, self.imx + 200, self.imy + 200
if selection == '1 in x 1 in':
x1, y1, x2, y2 = self.imx, self.imy, self.imx + 100, self.imy + 100
if selection == 'Passport Size':
x1, y1, x2, y2 = self.imx, self.imy, self.imx + 132.28, self.imy
+170.079
if x1 != None or y1 != None or x2 != None or y2 != None:
self.dimensions = {"x1":x1, "y1":y1, "x2":x2, "y2":y2}
width = 5
self.border = self.canvas.create_rectangle(x1+ width, y1 +
width, x2 + width, y2 + width, width=width, outline="#ffffff", fill ="",
tags = "rectangle")
else:
pass
def crop(self, event=None):
# cropping the image
try:
self.crop_image = self.im.crop((self.dimensions["x1"] +
self.movex,
self.dimensions["y1"] + self.movey,
self.dimensions["x2"] + self.movex,
self.dimensions["y2"] + self.movey))
except:
print("cropping failed")
return 1
self.newly_cropped = ImageTk.PhotoImage(self.crop_image)
try:
new_image = self.canvas.create_image(120, 120,
image=self.newly_cropped)
print("Image is cropped")
except:
print("Cropping failed")
def __init__(self,window):
frame1 = Frame(bg='red')
frame1.pack(side=TOP, fill=X)
frame2height = 600
frame2width = 600
frame2 = Frame(window, bd=2, relief=SUNKEN)
frame2.pack(side=LEFT, fill=X)
frame3 = Frame(bg='green')
frame3.pack(side=LEFT, fill=X)
# Button that open pictures
open = Button(frame1, text='Open Pic', padx=20, command =
self.open_app)
open.pack(pady=5, padx=5, side=LEFT)
# Creating a canvas widget
self.canvas = tk.Canvas(frame2, height=frame2height,
width=frame2width,
bg='gray')
self.xsb = Scrollbar(frame2, orient="horizontal",
command=self.canvas.xview)
self.ysb = Scrollbar(frame2, orient="vertical",
command=self.canvas.yview)
self.canvas.configure(yscrollcommand=self.ysb.set,
xscrollcommand=self.xsb.set)
self.canvas.configure(scrollregion=(0, 0, 1000, 1000))
# keeps track of data being dragged
self._drag_data = {"x": 0, "y": 0, "item": None}
# creating image and crop border
self.canvas.tag_bind("image","<ButtonPress-1>", self.on_drag)
self.canvas.tag_bind("image","<ButtonRelease-1>", self.on_release)
self.canvas.tag_bind("image","<B1-Motion>", self.on_motion)
# widget positions in frame2
self.xsb.pack(side=BOTTOM, fill=X)
self.canvas.pack(side=LEFT)
self.ysb.pack(side=LEFT, fill=Y)
self.combo = ttk.Combobox(frame1)
# Combobox selections
self.combo['values'] = ('No Crop', '2 in x 2 in', '1 in x 1 in',
'Passport Size')
self.combo.current(0)
self.combo.pack(pady=5, padx=5, side=LEFT)
self.combo.bind("<Button-1>", self.draw)
# Button that crops picture
self.crop = Button(frame1, text='Crop Pic', padx=20,
command=self.crop)
self.crop.pack(pady=5, padx=5, side=LEFT)
# this window has all the properties of tkinter.
# .Tk() declares this variable as the frame
window = tk.Tk()
# .title() will input whatever title you want for the app
window.title("ID Picture Generator")
# .geometry() sets the size in pixels of what the window will be
window.geometry("800x600")
app = PictureEditor(window)
# runs everything inside the window
window.mainloop()