Merge two pieces of code

john_hobbyist

@mrjj If I post my code, will that help?

mrjj

@john_hobbyist
Hi
It might as then we are sure its the current code that you have right now.
Also others might spot what the issue can be.

I think its might be Local / Global coordinate issues but I cannot understand how
the Rubberband can react to MouseEvents from the Canvas widget since its
clearly outside.

John Owen

This post is deleted!

john_hobbyist

This is the code where I figure out the problem (source: https://stackoverflow.com/questions/34220275/how-to-select-a-region-with-qrubberband-on-a-qlabel-like-in-ksnapshot)

    def mousePressEvent(self, event):
        print("56")
        '''
            Mouse is pressed. If selection is visible either set dragging mode (if close to border) or hide selection.
            If selection is not visible make it visible and start at this point.
        '''

        if event.button() == QtCore.Qt.LeftButton:
            print("57")

            position = QtCore.QPoint(event.pos())
            print("58")
            if self.selection.isVisible():
                print("59")
                # visible selection
                if (self.upper_left - position).manhattanLength() < 20:
                    print("60")
                    # close to upper left corner, drag it
                    self.mode = "drag_upper_left"
                    print("61")
                elif (self.lower_right - position).manhattanLength() < 20:
                    print("62")
                    # close to lower right corner, drag it
                    self.mode = "drag_lower_right"
                    print("63")
                else:
                    print("64")
                    # clicked somewhere else, hide selection
                    self.selection.hide()
                    print("65")
            else:
                # no visible selection, start new selection
                print("66")
                self.upper_left = position
                print("67")
                self.lower_right = position
                print("68")
                self.mode = "drag_lower_right"
                print("69")
                self.selection.show()
                print("70")

    def mouseMoveEvent(self, event):
        print("71")
        '''
            Mouse moved. If selection is visible, drag it according to drag mode.
        '''
        if self.selection.isVisible():
            print("72")
            # visible selection
            if self.mode == "drag_lower_right":
                print("73")
                self.lower_right = QtCore.QPoint(event.pos())
                #self.lower_right = QtCore.QPoint(0, 0)
                print("74")
            elif self.mode == "drag_upper_left":
                print("75")
                
                self.upper_left = QtCore.QPoint(event.pos())
                #self.upper_left = QtCore.QPoint(10, 10)
                print("76")
            # update geometry
            self.selection.setGeometry(QtCore.QRect(self.upper_left, self.lower_right).normalized())
            # self.selection.setGeometry(QtCore.QRect(100, 100).normalized())
            print("76A")
            print( QtCore.QRect(self.upper_left, self.lower_right).normalized() )
            print("77")

So the things have like this:
I run the code, the GUI starts and I move the mouse inside the image canvas, I continuously get the number:

When I press the mouse button (and do nothing else, not move the mouse), I get:

After I pressed the mouse button and I move the mouse, I continuously get:

PyQt5.QtCore.QRect(93, 84, 841, 149)  <--- the numbers inside QRect change
77
71
72
73
74
76A

Do you see something strange here?

SGaist

What exactly is your issue ?

If you find the rectangle strange why not print the points used to create it ?

john_hobbyist

@SGaist I am not talking about the printing the values of the rectangle here, but the fact that when I try to use qrubberband...Please look my previous messages, and the images that I have posted in order to help you help me... To sum up the qrubberband rectangle is not shown/visible inside the canvas but is limited on the upper left corner...Thank you for your time..

SGaist

Where is this code implemented exactly ?

john_hobbyist

This post is deleted!

SGaist

@john_hobbyist said in Merge two pieces of code:

Do you see the problem?

Bluntly speaking, your MyMplCanvas __init__ implementation is a mess. You are calling the init method of QLabel, do some stuff, then call the base class init implementation through super, set the parent independently, then you manage to use a method called imshow which is also a method from OpenCV's highgui module.

You really should start by cleaning this up.

Do things step by step.

First question is: taking the rubber band part out of the equation for now, why do you need all these modifications on the MplCanvas class ? Are you sure you are using it correctly ?

john_hobbyist

This post is deleted!