python_俄罗斯方块

import sys  
import random  
from PyQt4 import QtCore, QtGui  
class Tetris(QtGui.QMainWindow):  
    def __init__(self):  
        QtGui.QMainWindow.__init__(self)  
        self.setGeometry(300, 300, 180, 380)  
        self.setWindowTitle('Tetris')  
        self.tetrisboard = Board(self)  
        self.setCentralWidget(self.tetrisboard)  
        self.statusbar = self.statusBar()  
        self.connect(self.tetrisboard, QtCore.SIGNAL("messageToStatusbar(QString)"),  
            self.statusbar, QtCore.SLOT("showMessage(QString)"))  
        self.tetrisboard.start()  
        self.center()  
    def center(self):  
        screen = QtGui.QDesktopWidget().screenGeometry()  
        size =  self.geometry()  
        self.move((screen.width()-size.width())/2,  
            (screen.height()-size.height())/2)  
class Board(QtGui.QFrame):  
    BoardWidth = 10  
    BoardHeight = 22  
    Speed = 300  
    def __init__(self, parent):  
        QtGui.QFrame.__init__(self, parent)  
        self.timer = QtCore.QBasicTimer()  
        self.isWaitingAfterLine = False  
        self.curPiece = Shape()  
        self.nextPiece = Shape()  
        self.curX = 0  
        self.curY = 0  
        self.numLinesRemoved = 0  
        self.board = []  
        self.setFocusPolicy(QtCore.Qt.StrongFocus)  
        self.isStarted = False  
        self.isPaused = False  
        self.clearBoard()  
        self.nextPiece.setRandomShape()