Get upper left and down right coordinates from zoomed image

SGaist

From memory, make your button checkable and use the On and Off state of QIcon to show your different images.

john_hobbyist

Ok, I searching it. The code that I want to execute when I "switch on" the button icon has methods defined inside. How can I handle this situation? I mean: I attached the "method2" obviously when the button is pressed (switch on):

button2 = QAction("area selection", self, triggered=self.method2)

but: can inside method2 define other methods?

def method2():
    def do_this():
    . . . 
    def do_that():
    . . .

jsulm

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

can inside method2 define other methods?

Why do you want to define functions inside a method?

john_hobbyist

@jsulm I wrote the code for area selection alone to see if it works, outside the main program, in a different file. But now I need to include it to the main PyQt5 code in order to make it run when I switch on the button. Do you have a better suggestion?

jsulm

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

I wrote the code for area selection alone to see if it works, outside the main program, in a different file. But now I need to include it to the main PyQt5 code in order to make it run when I switch on the button. Do you have a better suggestion?

This does not explain at all why you think you need to define functions inside a method. Why don't you define those functions as normal methods in the same class?

john_hobbyist

@jsulm I find it more easy to program it with methods.
So the idea is that I call a "method_1" when the button is pressed. This "method_1" calls an instance of the "class_1". "Class_1" includes the code for area selection. The problem is that when I run the pyqt5 code , only the "class_1" is executed!!!

jsulm

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

This "method_1" calls an instance of the "class_1"

How is this related to functions inside a method?!
If you want to call a method on a class then you need an instance of that class.

john_hobbyist

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john_hobbyist

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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...