#coding=utf-8
'''
Created on 2012-4-6

@author: 大孟
'''
import sys
from PyQt4 import  QtGui, QtCore 
from PyQt4.QtCore import Qt
from PyQt4.QtCore import QPoint
from PyQt4.QtCore import QTimer
from PyQt4.QtCore import QTime
from PyQt4.QtGui import QPainter
from PyQt4.QtGui import QColor
from PyQt4.QtGui import QPolygon
from PyQt4.QtCore import SIGNAL as signal
class Clock(QtGui.QWidget):
    '''
    classdocs
    '''

def __init__(self):
    '''
    Constructor
    '''

    super(Clock, self).__init__() 

    self.hourColor=QColor(127, 0, 127);
    self.minuteColor=QColor(0, 127, 127, 191)
    self.secondColor=QColor(127, 127,0,120)
    self.initUI()
    self.timer = QTimer()
    self.timer.timeout.connect(self.update)
    self.timer.start(30)
    self.show()

def handChange(self):   

    self.side = min(self.width(), self.height())
    self.hand=(max(self.side/200,4), max(self.side/100,8), max(self.side/40,30))
    self.hourHand=QPolygon([QPoint(self.hand[0],self.hand[1]),QPoint(-self.hand[0],self.hand[1]),QPoint(0,-self.hand[2])])
    self.minuteHand=QPolygon([QPoint(self.hand[0],self.hand[1]),QPoint(-self.hand[0],self.hand[1]),QPoint(0,-self.hand[2]*2)])
    self.secondHand=QPolygon([QPoint(self.hand[0],self.hand[1]),QPoint(-self.hand[0],self.hand[1]),QPoint(0,-self.hand[2]*3)])

def set_transparency(self, enabled):
    if enabled:
        self.setAutoFillBackground(False)
    else:
        self.setAttribute(Qt.WA_NoSystemBackground, False)
    #下面這種方式好像不行

pal=QtGui.QPalette()
pal.setColor(QtGui.QPalette.Background, QColor(127, 127,10,120))
self.setPalette(pal)

    self.setAttribute(Qt.WA_TranslucentBackground, enabled)
    self.repaint()

def initUI(self):     

    self.setGeometry(300, 300, 300, 200)
    self.setWindowTitle('Clock')
    self.handChange()
    self.rightButton=False
    # 下面兩個配合實現窗體透明和置頂
    sizeGrip=QtGui.QSizeGrip(self)
    self.setWindowFlags(Qt.FramelessWindowHint|Qt.WindowStaysOnTopHint|Qt.SubWindow )
    #self.setMouseTracking(True);
    self.trans=True

    self.set_transparency(True)

    quitAction = QtGui.QAction(QtGui.QIcon('quit.png'), '&Quit', self)
    self.connect(quitAction,signal("triggered()"),QtGui.qApp.quit)
    backAction = QtGui.QAction( '&Back', self)
    self.connect(backAction,signal("triggered()"),self.backClicked)
    self.popMenu= QtGui.QMenu()
    self.popMenu.addAction(quitAction)
    self.popMenu.addAction(backAction)


def resizeEvent(self, e): 
    self.handChange()

def backClicked(self):
    if self.trans == True :
        self.trans = False 
        self.set_transparency(False)
    else:
        self.trans = True
        self.set_transparency(True)

def mouseReleaseEvent(self,e):
    if self.rightButton == True:
        self.rightButton=False
        self.popMenu.popup(e.globalPos())

def mouseMoveEvent(self, e):
    if e.buttons() & Qt.LeftButton:
        self.move(e.globalPos()-self.dragPos)
        e.accept()
def mousePressEvent(self, e):

    if e.button() == Qt.LeftButton:
        self.dragPos=e.globalPos()-self.frameGeometry().topLeft()
        e.accept()
    if e.button() == Qt.RightButton and self.rightButton == False:
        self.rightButton=True

def paintEvent(self, e):
    time = QTime.currentTime()
    qp = QPainter()

    qp.begin(self)
    #qp.setRenderHint(QPainter.Antialiasing)  # 開啟這個抗鋸齒,會很占cpu的!
    qp.translate(self.width() / 2, self.height() / 2)
    qp.scale(self.side / 200.0, self.side / 200.0)

    qp.setPen(QtCore.Qt.NoPen)
    qp.setBrush(self.hourColor)
    qp.save()
    qp.rotate(30.0 * ((time.hour() + time.minute()/ 60.0)))
    qp.drawConvexPolygon(self.hourHand)
    qp.restore()

    qp.setPen(self.hourColor)
    for i in range(12):
        qp.drawLine(88, 0, 96, 0)
        qp.rotate(30.0)

    qp.setPen(QtCore.Qt.NoPen)
    qp.setBrush(self.minuteColor)
    qp.save()

    qp.rotate(6.0 * ((time.minute() + (time.second()+time.msec()/1000.0) / 60.0)))
    qp.drawConvexPolygon(self.minuteHand)
    qp.restore()


    qp.setPen(self.minuteColor)
    for i in range(60):
        if (i % 5) is not 0:
            qp.drawLine(92, 0, 96, 0)
        qp.rotate(6.0)

    qp.setPen(QtCore.Qt.NoPen)
    qp.setBrush(self.secondColor)
    qp.save()
    qp.rotate(6.0*(time.second()+time.msec()/1000.0))
    qp.drawConvexPolygon(self.secondHand)
    qp.restore()
    qp.end()

if name == 'main':
    app = QtGui.QApplication(sys.argv)
    clock = Clock()
    sys.exit(app.exec_())</pre>