pyqt qgraphicsView: Get coordinate from image

[mshemuni]

Hi everyone.
There is a qgraphicsView and I made zooming enable with scroll ball. Now I want get coordinates when I click on it. However on zooming coordinates should change and I want it to return coordinates from image. Is it possible? Here my code:

def display(self, FilePath, displayDevice):
	if os.path.isfile(FilePath):
		scene = QtGui.QGraphicsScene()
		scene.addPixmap(QtGui.QPixmap(FilePath))
		displayDevice.setScene(scene)

def display(self, FilePath, displayDevice):
	if os.path.isfile(FilePath):
		scene = QtGui.QGraphicsScene()
		scene.addPixmap(QtGui.QPixmap(FilePath))
		displayDevice.setScene(scene)

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def zoom(self, display, val):
	display.scale(val, val)

def zoom(self, display, val):
	display.scale(val, val)

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[lanz]

You can take click coordinates on the view, and then use display.mapToScene to get scene coordinates, I think it should be aware of scaling/rotating etc.

[mshemuni]

Have you any example?
I'm a newbie.

[lanz]

Well, I'll try, but since I'm not very familiar with pyqt, expect it to be somewhat flaky
You'll need to overload mouse event handler, so you'll need custom graphics view

class CustomGraphicsView(QGraphicsView):
   def mousePressEvent(self, mouse_evt):
       point = self.mapToScene (mouse_evt.pos)

class CustomGraphicsView(QGraphicsView):
   def mousePressEvent(self, mouse_evt):
       point = self.mapToScene (mouse_evt.pos)

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And in point you'll get point in scene coords. Of course you should declare your view as CustomGraphicsView.