How to put an image in QGraphicsView's scrollbar area?

Question

Due to some restrictions image has to be in the class QMainWindow and scrollbars have to be the QGraphicsView class.

This means that I have to add image in QGraphicsView class through QMainWindow class. "exit.png" exists in the folder from where I run this code.

What is the proper way to add this picture?

import sys

from PyQt4 import QtGui
from PyQt4 import QtCore

class Window(QtGui.QGraphicsView):

  def __init__(self, parent=None):

        QtGui.QGraphicsView.__init__(self, parent)
        self.scene = QtGui.QGraphicsScene(self)
        self.scene.setBackgroundBrush(QtGui.QBrush(QtCore.Qt.darkGray, QtCore.Qt.SolidPattern))
        self.setScene(self.scene)

        self.setDragMode(QtGui.QGraphicsView.ScrollHandDrag)
        self.setTransformationAnchor(QtGui.QGraphicsView.AnchorUnderMouse)
        self.viewport().setCursor(QtCore.Qt.CrossCursor)
        self.setHorizontalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOn)
        self.setVerticalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOn)

        print "sdsads"


class CityscapesLabelTool(QtGui.QMainWindow):
    def __init__(self, parent=None):

        QtGui.QMainWindow.__init__(self, parent)
        centralwidget = Window()
        self.setCentralWidget(centralwidget) 

        centralwidget.scene.image = QtGui.QImage("exit.png")


app = QtGui.QApplication(sys.argv)
GUI = CityscapesLabelTool()
GUI.show()
sys.exit(app.exec_())

Answer 1

For this case the solution is to use a QGraphicsPixmapItem:

class CityscapesLabelTool(QtGui.QMainWindow):
    def __init__(self, parent=None):

        QtGui.QMainWindow.__init__(self, parent)
        centralwidget = Window()
        self.setCentralWidget(centralwidget) 

        centralwidget.scene.addPixmap(QtGui.QPixmap("exit.png"))
        # or
        # item = QtGui.QGraphicsPixmapItem(QtGui.QPixmap("exit.png"))
        # centralwidget.scene.addItem(item)