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    <p>You should look into the QGraphicsView instead of what you are doing, it has this all built in already.</p> <p><a href="http://doc.qt.nokia.com/4.7-snapshot/qgraphicsview.html" rel="nofollow">http://doc.qt.nokia.com/4.7-snapshot/qgraphicsview.html</a></p> <p><a href="http://doc.qt.nokia.com/4.7-snapshot/qgraphicsscene.html" rel="nofollow">http://doc.qt.nokia.com/4.7-snapshot/qgraphicsscene.html</a></p> <pre><code>from PyQt4 import QtGui, QtCore class MyFrame(QtGui.QGraphicsView): def __init__( self, parent = None ): super(MyFrame, self).__init__(parent) self.setScene(QtGui.QGraphicsScene()) # add some items x = 0 y = 0 w = 45 h = 45 pen = QtGui.QPen(QtGui.QColor(QtCore.Qt.green)) brush = QtGui.QBrush(pen.color().darker(150)) item = self.scene().addEllipse(x, y, w, h, pen, brush) item.setFlag(QtGui.QGraphicsItem.ItemIsMovable) if ( __name__ == '__main__' ): app = QtGui.QApplication([]) f = MyFrame() f.show() app.exec_() </code></pre> <p><strong>Edit: Showing how to create a QPainterPath</strong></p> <pre><code>from PyQt4 import QtGui, QtCore class MyFrame(QtGui.QGraphicsView): def __init__( self, parent = None ): super(MyFrame, self).__init__(parent) scene = QtGui.QGraphicsScene() self.setScene(scene) # add some items x = 0 y = 0 w = 45 h = 45 pen = QtGui.QPen(QtGui.QColor(QtCore.Qt.green)) brush = QtGui.QBrush(pen.color().darker(150)) item = scene.addEllipse(x, y, w, h, pen, brush) item.setFlag(QtGui.QGraphicsItem.ItemIsMovable) # create an open path path = QtGui.QPainterPath() path.moveTo(-w, -h) path.lineTo(-w, h) path.lineTo(w, h) path.lineTo(w, -h) clr = QtGui.QColor('blue') clr.setAlpha(120) brush = QtGui.QBrush(clr) pen = QtGui.QPen(QtCore.Qt.NoPen) fill_item = scene.addRect(-w, y, w*2, h, pen, brush) path_item = scene.addPath(path) if ( __name__ == '__main__' ): app = QtGui.QApplication([]) f = MyFrame() f.show() app.exec_() </code></pre>
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    1. COThanks Eric for valuable reply, but this solves my partial problem. Actually I want to draw a Water Tank which I feel will be drawn using Polyline because I need three sides and not the top one. And the 'QGraphicsScene' object has no attribute 'addPolyline'. Secondly, I want to fill the tank depending upon my value. How can I fill the water tank (lets see with blue color)?
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    2. COYou can control the objects in your scene - they don't have to be the simple shape objects. I would start by looking at the QGraphicsPathItem that allows you to define any QPainterPath to be drawn, with support for filling. For more complex items than that, you can subclass any QGraphicsItem that gets you close and implement your own paintEvent method
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    3. COBtw the shortcut to add a path is QGraphicsScene.addPath
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