【Pyqt4 实例13】飞舞的蝴蝶

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#-*- coding:utf8 -*-from PyQt4.QtCore import *from PyQt4.QtGui import *import mathQTextCodec.setCodecForTr(QTextCodec.codecForName("utf-8"))class Butterfly(QGraphicsItem):    def __init__(self):        super(Butterfly,self).__init__()        self.pix_up = QPixmap()        self.pix_down = QPixmap()        self.up = True        self.pix_up.load("image/butterfly.png")        self.pix_down.load("image/butterfly_down.png")        self.aa=QTimer()        self.aa.timeout.connect(self.slottimer)        self.aa.start(1000)         self.angle = 0                    def boundingRect(self):        adjust = 2        return QRectF(-self.pix_up.width()/2 - adjust,-self.pix_up.height()/2 - adjust,self.pix_up.width() + adjust * 2,self.pix_up.height() + adjust * 2)        def paint(self,painter,option,widget):                    if(self.up):                painter.drawPixmap(self.boundingRect().topLeft(),self.pix_up)                self.up = not self.up            else:                painter.drawPixmap(self.boundingRect().topLeft(),self.pix_down)                self.up = not self.up    def paintEvent(self,painter,QPaintEvent):                    if(self.up):                painter.drawPixmap(self.boundingRect().topLeft(),self.pix_up)                self.up = not self.up            else:                painter.drawPixmap(self.boundingRect().topLeft(),self.pix_down)                self.up = not self.up                def slottimer(self):               edgex = self.scene().sceneRect().right() + self.boundingRect().width()/2            edgetop = self.scene().sceneRect().top() + self.boundingRect().height()/2            edgebottom = self.scene().sceneRect().bottom() + self.boundingRect().height()/2                    if(self.pos().x() >= edgex):                self.setPos(self.scene().sceneRect().left(),self.pos().y())            if(self.pos().y() <= edgetop):                self.setPos(self.pos().x(),self.scene().sceneRect().bottom())            if(self.pos().y() >= edgebottom):                self.setPos(self.pos().x(),self.scene().sceneRect().top())                    self.angle += (qrand()%10)/20.0            self.dx = math.fabs(math.sin(self.angle * math.pi) * 10.0)            self.dy = (qrand()%20) - 10.0            self.setPos(self.mapToParent(self.dx,self.dy))class MainWidget(QWidget):    def __init__(self):        super(MainWidget,self).__init__()        self.scene = QGraphicsScene()        self.scene.setSceneRect(-200,-200,400,400)        self.butterfly = Butterfly()         self.butterfly.setPos(-100,0)        self.scene.addItem(self.butterfly)         self.view = QGraphicsView()        self.view.setScene(self.scene)        self.view.setMinimumSize(400,400)                self.mainlayout = QHBoxLayout()        self.mainlayout.addWidget(self.view)        self.setLayout(self.mainlayout)        self.setWindowTitle(self.tr("飞舞的蝴蝶"))    if __name__ == '__main__':    import sys    app = QApplication(sys.argv)    mainwindow = MainWidget()    mainwindow.show()    sys.exit(app.exec_())
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