Coordinates of an image PyQt

Question

I'm making an application for which I need to extract the coordinates of the image on mouse click. The images have a resolution of 1920x1080 and the resolution of my laptop screen is 1366x768.

I'm facing two problems here. 1) The images shows up in a cropped manner on my laptop. 2) Whenever I click the mouse button it gives me the coordinate of my laptop screen not of the image.

I strictly don't have to resize the image and secondly, in my final project the image would not occupy the entire screen, it will be occupying only a portion of the screen. I'm looking for a way to show the entire image as well getting the coordinates with respect to the image.

from PyQt4 import QtGui, QtCore
import sys


class Window(QtGui.QLabel):
    def __init__(self, parent=None):
        super(Window, self).__init__(parent)

        self.setPixmap(QtGui.QPixmap('image.jpg'))
        self.mousePressEvent = self.getPos

    def getPos(self , event):
        x = event.pos().x()
        y = event.pos().y()
        self.point = (x, y)
        print(self.point)


if __name__ == "__main__":
    app = QtGui.QApplication([])
    w = Window()
    w.showMaximized()
    sys.exit(app.exec_())

Here is an image which will give you an idea about my final project.

Answer 1

Instead of using QLabel you should use QGraphicsView as it has the advantage of easy scaling and easy handling of coordinates

from PyQt5 import QtCore, QtGui, QtWidgets


class GraphicsView(QtWidgets.QGraphicsView):
    def __init__(self, parent=None):
        super().__init__(parent)
        scene = QtWidgets.QGraphicsScene(self)
        self.setScene(scene)

        self._pixmap_item = QtWidgets.QGraphicsPixmapItem()
        scene.addItem(self.pixmap_item)

    @property
    def pixmap_item(self):
        return self._pixmap_item

    def setPixmap(self, pixmap):
        self.pixmap_item.setPixmap(pixmap)

    def resizeEvent(self, event):
        self.fitInView(self.pixmap_item, QtCore.Qt.KeepAspectRatio)
        super().resizeEvent(event)

    def mousePressEvent(self, event):
        if self.pixmap_item is self.itemAt(event.pos()):
            sp = self.mapToScene(event.pos())
            lp = self.pixmap_item.mapFromScene(sp).toPoint()
            print(lp)


if __name__ == "__main__":
    import sys

    app = QtWidgets.QApplication(sys.argv)
    w = GraphicsView()
    w.setPixmap(QtGui.QPixmap("image.jpg"))
    w.showMaximized()
    sys.exit(app.exec_())