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Tkinter: draw a rectangle with the mouse

Please help me solve this problem.

I want to allow the user to draw a random rectangle around a specific area of ​​interest to the image with the mouse (by right-clicking or left-clicking until it releases it).

I deal with large images (images are larger than the resolution of my screen, for example one ), so the user needs to scroll to see the image in full.

Here is the code that I tried just to display a large image, but I have no idea how to allow the user to draw a rectangle over the object (say, the person in the picture) with the mouse:

from Tkinter import *
import Image,ImageTk

root=Tk()
canv=Canvas(root,relief=SUNKEN)

sbarv=Scrollbar(root,orient=VERTICAL)
sbarh=Scrollbar(root,orien=HORIZONTAL)

sbarv.config(command=canv.yview)
sbarh.config(command=canv.xview)

canv.config(yscrollcommand=sbarv.set)
canv.config(xscrollcommand=sbarh.set)

canv.grid(row=0,column=0,sticky=N+S+E+W)
sbarv.grid(row=0,column=1,sticky=N+S)

sbarh.grid(row=1,column=0,sticky=E+W)


im=Image.open("image.jpg")
width,height=im.size
canv.config(scrollregion=(0,0,width,height))
im2=ImageTk.PhotoImage(im)
imgtag=canv.create_image(0,0,anchor="nw",image=im2)

root.mainloop()

EDIT 1:

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import PIL.Image
import Image
import ImageTk
from Tkinter import *    


class ExampleApp(Frame):
    def __init__(self,master):
        Frame.__init__(self,master=None)
        self.x = self.y = 0
        self.canvas = Canvas(master,  cursor="cross")

        self.sbarv=Scrollbar(self,orient=VERTICAL)
        self.sbarh=Scrollbar(self,orient=HORIZONTAL)
        self.sbarv.config(command=self.canvas.yview)
        self.sbarh.config(command=self.canvas.xview)

        self.canvas.config(yscrollcommand=self.sbarv.set)
        self.canvas.config(xscrollcommand=self.sbarh.set)

        self.canvas.grid(row=0,column=0,sticky=N+S+E+W)
        self.sbarv.grid(row=0,column=1,stick=N+S)
        self.sbarh.grid(row=1,column=0,sticky=E+W)

        self.canvas.bind("<ButtonPress-1>", self.on_button_press)
        self.canvas.bind("<B1-Motion>", self.on_move_press)
        self.canvas.bind("<ButtonRelease-1>", self.on_button_release)

        self.rect = None

        self.start_x = None
        self.start_y = None


        self.im = PIL.Image.open("logo.png")
        self.wazil,self.lard=self.im.size
        self.canvas.config(scrollregion=(0,0,self.wazil,self.lard))
        self.tk_im = ImageTk.PhotoImage(self.im)
        self.canvas.create_image(0,0,anchor="nw",image=self.tk_im)   


    def on_button_press(self, event):
        # save mouse drag start position
        self.start_x = event.x
        self.start_y = event.y

        # create rectangle if not yet exist
        #if not self.rect:
        self.rect = self.canvas.create_rectangle(self.x, self.y, 1, 1, fill="")

    def on_move_press(self, event):
        curX, curY = (event.x, event.y)

        # expand rectangle as you drag the mouse
        self.canvas.coords(self.rect, self.start_x, self.start_y, curX, curY)    


    def on_button_release(self, event):
        pass    

if __name__ == "__main__":
    root=Tk()
    app = ExampleApp(root)
    root.mainloop()
+1
1

, grid (self.sbarv=Scrollbar(self, ...)), . Canvas , (self.canvas = Canvas(master, ...)).

, , Canvas self,

app = ExampleApp(root)
app.pack()

event.x event.y ,

self.start_x = self.canvas.canvasx(event.x)
self.start_y = self.canvas.canvasy(event.y)


curX = self.canvas.canvasx(event.x)
curY = self.canvas.canvasy(event.y)

, , , ? , , . - :

w, h = self.canvas.winfo_width(), self.canvas.winfo_height()
if event.x > 0.9*w:
    self.canvas.xview_scroll(1, 'units') 
elif event.x < 0.1*w:
    self.canvas.xview_scroll(-1, 'units')
if event.y > 0.9*h:
    self.canvas.yview_scroll(1, 'units') 
elif event.y < 0.1*h:
    self.canvas.yview_scroll(-1, 'units')

, , , :

import PIL.Image
import Image
import ImageTk
from Tkinter import *    


class ExampleApp(Frame):
    def __init__(self,master):
        Frame.__init__(self,master=None)
        self.x = self.y = 0
        self.canvas = Canvas(self,  cursor="cross")

        self.sbarv=Scrollbar(self,orient=VERTICAL)
        self.sbarh=Scrollbar(self,orient=HORIZONTAL)
        self.sbarv.config(command=self.canvas.yview)
        self.sbarh.config(command=self.canvas.xview)

        self.canvas.config(yscrollcommand=self.sbarv.set)
        self.canvas.config(xscrollcommand=self.sbarh.set)

        self.canvas.grid(row=0,column=0,sticky=N+S+E+W)
        self.sbarv.grid(row=0,column=1,stick=N+S)
        self.sbarh.grid(row=1,column=0,sticky=E+W)

        self.canvas.bind("<ButtonPress-1>", self.on_button_press)
        self.canvas.bind("<B1-Motion>", self.on_move_press)
        self.canvas.bind("<ButtonRelease-1>", self.on_button_release)

        self.rect = None

        self.start_x = None
        self.start_y = None

        self.im = PIL.Image.open("logo.png")
        self.wazil,self.lard=self.im.size
        self.canvas.config(scrollregion=(0,0,self.wazil,self.lard))
        self.tk_im = ImageTk.PhotoImage(self.im)
        self.canvas.create_image(0,0,anchor="nw",image=self.tk_im)   


    def on_button_press(self, event):
        # save mouse drag start position
        self.start_x = self.canvas.canvasx(event.x)
        self.start_y = self.canvas.canvasy(event.y)

        # create rectangle if not yet exist
        if not self.rect:
            self.rect = self.canvas.create_rectangle(self.x, self.y, 1, 1, outline='red')

    def on_move_press(self, event):
        curX = self.canvas.canvasx(event.x)
        curY = self.canvas.canvasy(event.y)

        w, h = self.canvas.winfo_width(), self.canvas.winfo_height()
        if event.x > 0.9*w:
            self.canvas.xview_scroll(1, 'units') 
        elif event.x < 0.1*w:
            self.canvas.xview_scroll(-1, 'units')
        if event.y > 0.9*h:
            self.canvas.yview_scroll(1, 'units') 
        elif event.y < 0.1*h:
            self.canvas.yview_scroll(-1, 'units')

        # expand rectangle as you drag the mouse
        self.canvas.coords(self.rect, self.start_x, self.start_y, curX, curY)    

    def on_button_release(self, event):
        pass    

if __name__ == "__main__":
    root=Tk()
    app = ExampleApp(root)
    app.pack()
    root.mainloop()
+4

Source: https://habr.com/ru/post/1543953/

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