# Dessiner une image en utilisant paintEvent
from PySide import QtGui,QtCore
import sys
     
class ZoneDessin(QtGui.QWidget) :
    def __init__(self,parent=None) :
        super().__init__(parent)
        self.pixmap=QtGui.QPixmap("balle.png")
        self.posx=100
        self.posy=100
        self.dirx,self.diry=2,-2
        self.timer=QtCore.QBasicTimer()
        self.timer.start(10,self)

    def timerEvent(self,e) :
        self.posx+=self.dirx
        self.posy+=self.diry
        self.repaint()
        if self.posx<15 or self.posx>self.width()-15 : 
            self.dirx=-self.dirx        
        if self.posy<15 or self.posy>self.height()-15 : 
            self.diry=-self.diry        

    def mousePressEvent(self,e) :
        if (self.posx-e.x())**2+(self.posy-e.y())**2<15**2 :
            if self.timer.isActive() : self.timer.stop()
            else : self.timer.start(10,self)
        
    def paintEvent(self,e) :
        p=QtGui.QPainter(self)
        p.drawPixmap(self.posx-16,self.posy-16,32,32,self.pixmap)

class Fenetre(QtGui.QMainWindow):
    def __init__(self,parent=None) :
        super().__init__(parent)
        self.resize(420,420)
        self.setWindowTitle("Balle")
        dessin=ZoneDessin(self)
        dessin.setGeometry(10,10,400,400)
 
app=QtGui.QApplication(sys.argv)
frame=Fenetre()
frame.show()
sys.exit(app.exec_())