Graphics View - Simple Animation

 1 # simple code by Krystian Samp - krychu (samp[dot]krystian[monkey]gmail.com), November 2006
 2 
 3 import sys
 4 from PyQt4 import QtGui, QtCore
 5 
 6 class MyView(QtGui.QGraphicsView):
 7  def __init__(self):
 8  QtGui.QGraphicsView.__init__(self)
 9 
 10  self.scene = QtGui.QGraphicsScene(self)
 11  self.item = QtGui.QGraphicsEllipseItem(-20, -10, 40, 20)
 12  self.scene.addItem(self.item)
 13  self.setScene(self.scene)
 14 
 15  # Remember to hold the references to QTimeLine and QGraphicsItemAnimation instances.
 16  # They are not kept anywhere, even if you invoke QTimeLine.start().
 17  self.tl = QtCore.QTimeLine(1000)
 18  self.tl.setFrameRange(0, 100)
 19  self.a = QtGui.QGraphicsItemAnimation()
 20  self.a.setItem(self.item)
 21  self.a.setTimeLine(self.tl)
 22 
 23  # Each method determining an animation state (e.g. setPosAt, setRotationAt etc.)
 24  # takes as a first argument a step which is a value between 0 (the beginning of the
 25  # animation) and 1 (the end of the animation)
 26  self.a.setPosAt(0, QtCore.QPointF(0, -10))
 27  self.a.setRotationAt(1, 360)
 28 
 29  self.tl.start()
 30 
 31 if __name__ == '__main__':
 32  app = QtGui.QApplication(sys.argv)
 33  view = MyView()
 34  view.show()
 35  sys.exit(app.exec_())