Get upper left and down right coordinates from zoomed image

john_hobbyist

After a lot of google searching and experiments I resulted in this concept:

class area:
    def __call__(self):
        x = 0, y = 0  # step 1
    
        def read_cursor(action):
            x = read_x
            y = read_y
            . . .
        def do_something(action):
            . . .

The problem that x,y are not being updated when I move mouse. How do I pass the new updated mouse coordinates from read_cursor() function to ones in # step 1??

SGaist

You should provide a minimal runnable script that shows what you want to do with that piece of code.

john_hobbyist

My code above is very simple. I need only to update x, y values (#step1), if someone can help me...

SGaist

Your code is incomplete and without context.
It does not allow to understand the logic you want to implement.

john_hobbyist

The idea is that I have a function embedded to another function. Generally speaking, how can I pass values from the inner function to the outer function?

jsulm

@john_hobbyist said in Get upper left and down right coordinates from zoomed image:

how can I pass values from the inner function to the outer function?

By returning them

def __call__(self):
    def read_cursor(action):
        x = read_x
        y = read_y
        return (x, y)

    x, y = read_cursor(action)

I still don't understand why you need nested functions...

john_hobbyist

@jsulm I need to get the returned values when I call the function like this:

frame.bind("<Button-1>", callback)

So, in the position of

def read_cursor

put the

def callback

function

Please look here: https://web.archive.org/web/20201111211515id_/https://effbot.org/tkinterbook/tkinter-events-and-bindings.htm

How can I achieve that? I use tkinter auxiliary to PyQt5

SGaist

Why are you needing to add tkinter to your Qt application ?

john_hobbyist

@SGaist I tried qrubberband in the past (https://stackoverflow.com/questions/13840289/how-to-use-qrubberband-with-qrect-class-in-pyqt and https://stackoverflow.com/questions/34220275/how-to-select-a-region-with-qrubberband-on-a-qlabel-like-in-ksnapshot) but it didn't work! Also I need to get coordinates of the corners of the selected area and tkinter is very easy on this...

john_hobbyist

This post is deleted!

john_hobbyist

Ok, never mind, I solved it 80%. Another point, in the previously mentioned code (https://github.com/Axel-Erfurt/OrthoViewLite/blob/main/OrthoViewLite.py) in which part does the "store image" button be related? I have put "prints" in the entire code, nowhere I see an action on prints, when I zoom in and store the current image...

john_hobbyist

Alternatively, how can I have access to the current image each time that it is depicted? so that when I zoom the image with zoom button to get the current zoomed image and not the initial one that I have loaded when I run the app... I am always referring to the above mentioned github code... Anyone???