Matching 2 .tiff images pixel-by-pixel

mrjj

The code you showed higher up to drive the rubber band.
Or the docs @SGaist points to. they explain in detail what is needed.

def mousePressEvent(self, event):   ///// this set the start location of the band
    self.origin = event.pos()
    self.rubberband.setGeometry(
        QtCore.QRect(self.origin, QtCore.QSize()))
    self.rubberband.show()
    QtGui.QWidget.mousePressEvent(self, event)

def mouseMoveEvent(self, event): // this makes the band follow the mouse to adjust the size
    if self.rubberband.isVisible():
        self.rubberband.setGeometry(
            QtCore.QRect(self.origin, event.pos()).normalized())
    QtGui.QWidget.mouseMoveEvent(self, event)

def mouseReleaseEvent(self, event): // this is the end of the operation and you use the rectange defined by the band
    if self.rubberband.isVisible():
        self.rubberband.hide()
   rect = self.rubberband.geometry()

 ... then use rect for whatever you need

john_hobbyist

@mrjj: Thanks for your help! I am searching all morning. Here https://doc.qt.io/qtforpython/PySide6/QtWidgets/QRubberBand.html#more I don't see something about what to put inside the "event". The only I can understand is to use this inside events: https://doc.qt.io/qtforpython-5/PySide2/QtGui/QMouseEvent.html

mrjj

@john_hobbyist

Im not sure what you refer too ?

def mouseReleaseEvent(self, event): <<< this event ? the paramter ?

To use the rubberband, we use 3 functions as shown.

john_hobbyist

@mrjj
Yes, I try this:

self.mousePressEvent(event)

and the code requires to put something instead of "event". This is the error:

File "code.py", line 310, in __init__
  self.mousePressEvent(event)
NameError: name 'event' is not defined

SGaist

Where are you calling these methods from ?

john_hobbyist

@SGaist : Inside this method:

def __init__(self, parent=None):
   . . . 
   (code)
   . . . 
   self.mousePressEvent(event)
   self.mouseMoveEvent(event)
   self.mouseReleaseEvent(event)

. . . 

(other methods + code per method)

. . . 

def mousePressEvent(self, event):
   (code)

def mouseMoveEvent(self, event):
   (code)

def mouseReleaseEvent(self,event):
   (code)

which the first method of the class. Any idea?

SGaist

That's not how it works. These methods are automatically called when appropriate.

john_hobbyist

@SGaist : So I remove these lines?

self.mousePressEvent(event)
self.mouseMoveEvent(event)
self.mouseReleaseEvent(event)

What should I change?

SGaist

Implement the methods like shown in the QRubberBand class documentation.

john_hobbyist

@SGaist: Ok, I followed this: https://doc.qt.io/qtforpython/PySide6/QtWidgets/QRubberBand.html#qrubberband I put them into the Class. And that's it?

SGaist

That's the base yes.

john_hobbyist

@SGaist: It seems to get response, although I do not see the red rectangle... But the mouse events seem to recognize when I press or when I release the mouse. But I need to install rubberband because I get this error:

File "code.py", line 174, in mouseMoveEvent
  rubberBand.setGeometry(QRect(origin, event.pos()).normalized())
NameError: name 'rubberBand' is not defined

I am trying to fix it though! THANX!!!

jsulm

@john_hobbyist said in Matching 2 .tiff images pixel-by-pixel:

NameError: name 'rubberBand' is not defined

So, did you define rubberBand?

john_hobbyist

@jsulm: I try this solution from here: https://stackoverflow.com/questions/59899103/python-3-6-how-to-install-rubberband I haven't found a working solution but I am trying, because it has many! Any other idea?

jsulm

@john_hobbyist You did not answer the question...
The error you get says that rubberBand was not defined. It has nothing to do with installing anything.

john_hobbyist

@jsulm: I added this:

import rubberband

but again does not work! What should I do?

jsulm

@john_hobbyist Please read more carefully! Nobody is talking about "rubberband"!
The question was about: "NameError: name 'rubberBand' is not defined"
rubberband != rubberBand
So, one more time I repeat the question: was rubberBand defined anywhere?

SGaist

There are some errors in the python document snippet that will be fixed.

Here's an example:

import sys

from PySide2.QtCore import QRect
from PySide2.QtCore import QSize
from PySide2.QtWidgets import QWidget
from PySide2.QtWidgets import QRubberBand
from PySide2.QtWidgets import QApplication

class Widget(QWidget):
    def __init__(self, parent=None):
        super().__init__(parent)

        self.rubberBand = None
        self.origin = None

    def mousePressEvent(self, event):
        self.origin = event.pos()
        if not self.rubberBand:
            self.rubberBand = QRubberBand(QRubberBand.Rectangle, self)
        self.rubberBand.setGeometry(QRect(self.origin, QSize()))
        self.rubberBand.show()

    def mouseMoveEvent(self, event):
        self.rubberBand.setGeometry(QRect(self.origin, event.pos()).normalized())

    def mouseReleaseEvent(self, event):
        self.rubberBand.hide()
        # determine selection, for example using QRect.intersects()
        # and QRect.contains().

if __name__ == "__main__":
    app = QApplication(sys.argv)
    widget = Widget()
    widget.show()
    sys.exit(app.exec_())

On a side note, it looks like you are a beginner with Python, I would recommend getting the basics first before going further.

john_hobbyist

@jsulm : No

@SGaist: Thanks, I am looking at it...

john_hobbyist

@SGaist: I installed PySide2 and your code runs perfectly! Many thanks!

I combined your above code with my code and tried to run it, but I get this error:

File "code.py", line 30, in <module>
  from PySide2.QtCore import QRect
ImportError: /lib/x86_64-linux-gnu/libQt5Core.so.5: version `Qt_5.15' not found (required by /home/john/.local/lib/python3.8/site-packages/PySide2/QtCore.abi3.so)

After google search I found and followed the suggestions from this tutorial: https://stackoverflow.com/questions/63903441/python3-importerror-lib-x86-64-linux-gnu-libqt5core-so-5-version-qt-5-15-n which does not help because it is related to PyQt5 and not PySide2.

I have to note at this point that in my code I use both PyQt5 and PySide2 packages. Could the above error be a result of conflict between the packages?

I also study this: https://forum.qt.io/topic/89263/qt5-pyqt5-and-opencv-problem-with-import