I have a tool to capture screenshots but this tool only captures screenshots when you hold button-1 and move to the right side, when you hold button-1 and move it to the left side or up, it does not capture the screenshot, what is the reason and how can I fix it? I thought about it, but I think it's a mathematical problem, I'm waiting for your help.
import tkinter as tk
from PIL import Image, ImageTk, ImageGrab, ImageEnhance
root = tk.Tk()
root.resizable(0, 0)
def show_image(image):
win = tk.Toplevel()
win.image = ImageTk.PhotoImage(image)
tk.Label(win, image=win.image).pack()
win.grab_set()
win.wait_window(win)
def area_sel():
x1 = y1 = x2 = y2 = 0
roi_image = None
def on_mouse_down(event):
nonlocal x1, y1
x1, y1 = event.x, event.y
canvas.create_rectangle(x1, y1, x1, y1, outline='red', tag='roi')
def button_release(event):
print("ok")
win.destroy()
def on_mouse_move(event):
nonlocal roi_image, x2, y2
x2, y2 = event.x, event.y
canvas.delete('roi-image') # remove old overlay image
canvas.update()
roi_image = image.crop((x1, y1, x2, y2)) # get the image of selected region
canvas.image = ImageTk.PhotoImage(roi_image)
canvas.create_image(x1, y1, image=canvas.image, tag=('roi-image'), anchor='nw')
canvas.coords('roi', x1, y1, x2, y2)
# make sure the select rectangle is on top of the overlay image
canvas.lift('roi')
root.withdraw() # hide the root window
image = ImageGrab.grab() # grab the fullscreen as select region background
bgimage = ImageEnhance.Brightness(image).enhance(0.3) # darken the capture image
# create a fullscreen window to perform the select region action
win = tk.Toplevel()
win.attributes('-fullscreen', 1)
win.attributes('-topmost', 1)
canvas = tk.Canvas(win, highlightthickness=0)
canvas.pack(fill='both', expand=1)
tkimage = ImageTk.PhotoImage(bgimage)
canvas.create_image(0, 0, image=tkimage, anchor='nw', tag='images')
# bind the mouse events for selecting region
win.bind('<ButtonPress-1>', on_mouse_down)
win.bind('<ButtonRelease>', button_release)
win.bind('<B1-Motion>', on_mouse_move)
# use Esc key to abort the capture
win.bind('<Escape>', lambda e: win.destroy())
# make the capture window modal
win.focus_force()
win.grab_set()
win.wait_window(win)
root.deiconify() # restore root window
# show the capture image
if roi_image:
show_image(roi_image)
tk.Button(root, text='select area', width=30, command=area_sel).pack()
root.mainloop()
CodePudding user response:
You need to keep x1
<= x2
and y1 <= y2
when cropping image and creating the roi rectangle:
def normalize(x1, y1, x2, y2):
if x1 > x2:
x1, x2 = x2, x1
if y1 > y2:
y1, y2 = y2, y1
return x1, y1, x2, y2
def on_mouse_move(event):
nonlocal roi_image, x2, y2
x2, y2 = event.x, event.y
rect = normalize(x1, y1, x2, y2)
canvas.delete('roi-image') # remove old overlay image
roi_image = image.crop(rect) # get the image of selected region
canvas.image = ImageTk.PhotoImage(roi_image)
canvas.create_image(rect[:2], image=canvas.image, tag=('roi-image'), anchor='nw')
canvas.coords('roi', rect)
# make sure the select rectangle is on top of the overlay image
canvas.lift('roi')