pyqt 实现的俄罗斯方块

from PyQt5.QtWidgets import QMainWindow, QFrame, QDesktopWidget, QApplication
from PyQt5.QtCore import Qt, QBasicTimer, pyqtSignal
from PyQt5.QtGui import QPainter, QColor
import sys, random

class Tetris(QMainWindow):

    def __init__(self):
        super().__init__()

        self.initUI()

    def initUI(self):
        '''initiates application UI'''

        self.tboard = Board(self)
        self.setCentralWidget(self.tboard)

        self.statusbar = self.statusBar()
        self.tboard.msg2Statusbar[str].connect(self.statusbar.showMessage)

        self.tboard.start()

        self.resize(, )
        self.center()
        self.setWindowTitle('Tetris')
        self.show()

    def center(self):
        '''centers the window on the screen'''

        screen = QDesktopWidget().screenGeometry()
        size = self.geometry()
        self.move((screen.width()-size.width())/,
            (screen.height()-size.height())/)

class Board(QFrame):

    msg2Statusbar = pyqtSignal(str)

    BoardWidth =
    BoardHeight =
    Speed = 

    def __init__(self, parent):
        super().__init__(parent)

        self.initBoard()

    def initBoard(self):
        '''initiates board'''

        self.timer = QBasicTimer()
        self.isWaitingAfterLine = False

        self.curX =
        self.curY =
        self.numLinesRemoved =
        self.board = []

        self.setFocusPolicy(Qt.StrongFocus)
        self.isStarted = False
        self.isPaused = False
        self.clearBoard()

    def shapeAt(self, x, y):
        '''determines shape at the board position'''

        return self.board[(y * Board.BoardWidth) + x]

    def setShapeAt(self, x, y, shape):
        '''sets a shape at the board'''

        self.board[(y * Board.BoardWidth) + x] = shape

    def squareWidth(self):
        '''returns the width of one square'''

        return self.contentsRect().width() // Board.BoardWidth

    def squareHeight(self):
        '''returns the height of one square'''

        return self.contentsRect().height() // Board.BoardHeight

    def start(self):
        '''starts game'''

        if self.isPaused:
            return

        self.isStarted = True
        self.isWaitingAfterLine = False
        self.numLinesRemoved =
        self.clearBoard()

        self.msg2Statusbar.emit(str(self.numLinesRemoved))

        self.newPiece()
        self.timer.start(Board.Speed, self)

    def pause(self):
        '''pauses game'''

        if not self.isStarted:
            return

        self.isPaused = not self.isPaused

        if self.isPaused:
            self.timer.stop()
            self.msg2Statusbar.emit("paused")

        else:
            self.timer.start(Board.Speed, self)
            self.msg2Statusbar.emit(str(self.numLinesRemoved))

        self.update()

    def paintEvent(self, event):
        '''paints all shapes of the game'''

        painter = QPainter(self)
        rect = self.contentsRect()

        boardTop = rect.bottom() - Board.BoardHeight * self.squareHeight()

        for i in range(Board.BoardHeight):
            for j in range(Board.BoardWidth):
                shape = self.shapeAt(j, Board.BoardHeight - i - )

                if shape != Tetrominoe.NoShape:
                    self.drawSquare(painter,
                        rect.left() + j * self.squareWidth(),
                        boardTop + i * self.squareHeight(), shape)

        if self.curPiece.shape() != Tetrominoe.NoShape:

            for i in range():

                x = self.curX + self.curPiece.x(i)
                y = self.curY - self.curPiece.y(i)
                self.drawSquare(painter, rect.left() + x * self.squareWidth(),
                    boardTop + (Board.BoardHeight - y - ) * self.squareHeight(),
                    self.curPiece.shape())

    def keyPressEvent(self, event):
        '''processes key press events'''

        if not self.isStarted or self.curPiece.shape() == Tetrominoe.NoShape:
            super(Board, self).keyPressEvent(event)
            return

        key = event.key()

        if key == Qt.Key_P:
            self.pause()
            return

        if self.isPaused:
            return

        elif key == Qt.Key_Left:
            self.tryMove(self.curPiece, self.curX - , self.curY)

        elif key == Qt.Key_Right:
            self.tryMove(self.curPiece, self.curX + , self.curY)

        elif key == Qt.Key_Down:
            self.tryMove(self.curPiece.rotateRight(), self.curX, self.curY)

        elif key == Qt.Key_Up:
            self.tryMove(self.curPiece.rotateLeft(), self.curX, self.curY)

        elif key == Qt.Key_Space:
            self.dropDown()

        elif key == Qt.Key_D:
            self.oneLineDown()

        else:
            super(Board, self).keyPressEvent(event)

    def timerEvent(self, event):
        '''handles timer event'''

        if event.timerId() == self.timer.timerId():

            if self.isWaitingAfterLine:
                self.isWaitingAfterLine = False
                self.newPiece()
            else:
                self.oneLineDown()

        else:
            super(Board, self).timerEvent(event)

    def clearBoard(self):
        '''clears shapes from the board'''

        for i in range(Board.BoardHeight * Board.BoardWidth):
            self.board.append(Tetrominoe.NoShape)

    def dropDown(self):
        '''drops down a shape'''

        newY = self.curY

        while newY > :

            if not self.tryMove(self.curPiece, self.curX, newY - ):
                break

            newY -= 

        self.pieceDropped()

    def oneLineDown(self):
        '''goes one line down with a shape'''

        if not self.tryMove(self.curPiece, self.curX, self.curY - ):
            self.pieceDropped()

    def pieceDropped(self):
        '''after dropping shape, remove full lines and create new shape'''

        for i in range():

            x = self.curX + self.curPiece.x(i)
            y = self.curY - self.curPiece.y(i)
            self.setShapeAt(x, y, self.curPiece.shape())

        self.removeFullLines()

        if not self.isWaitingAfterLine:
            self.newPiece()

    def removeFullLines(self):
        '''removes all full lines from the board'''

        numFullLines =
        rowsToRemove = []

        for i in range(Board.BoardHeight):

            n =
            for j in range(Board.BoardWidth):
                if not self.shapeAt(j, i) == Tetrominoe.NoShape:
                    n = n + 

            if n == :
                rowsToRemove.append(i)

        rowsToRemove.reverse()

        for m in rowsToRemove:

            for k in range(m, Board.BoardHeight):
                for l in range(Board.BoardWidth):
                        self.setShapeAt(l, k, self.shapeAt(l, k + ))

        numFullLines = numFullLines + len(rowsToRemove)

        if numFullLines > :

            self.numLinesRemoved = self.numLinesRemoved + numFullLines
            self.msg2Statusbar.emit(str(self.numLinesRemoved))

            self.isWaitingAfterLine = True
            self.curPiece.setShape(Tetrominoe.NoShape)
            self.update()

    def newPiece(self):
        '''creates a new shape'''

        self.curPiece = Shape()
        self.curPiece.setRandomShape()
        self.curX = Board.BoardWidth // 2 + 1
        self.curY = Board.BoardHeight -  + self.curPiece.minY()

        if not self.tryMove(self.curPiece, self.curX, self.curY):

            self.curPiece.setShape(Tetrominoe.NoShape)
            self.timer.stop()
            self.isStarted = False
            self.msg2Statusbar.emit("Game over")

    def tryMove(self, newPiece, newX, newY):
        '''tries to move a shape'''

        for i in range():

            x = newX + newPiece.x(i)
            y = newY - newPiece.y(i)

            if x <  or x >= Board.BoardWidth or y <  or y >= Board.BoardHeight:
                return False

            if self.shapeAt(x, y) != Tetrominoe.NoShape:
                return False

        self.curPiece = newPiece
        self.curX = newX
        self.curY = newY
        self.update()

        return True

    def drawSquare(self, painter, x, y, shape):
        '''draws a square of a shape'''        

        colorTable = [0x000000, 0xCC6666, 0x66CC66, 0x6666CC,
                      0xCCCC66, 0xCC66CC, 0x66CCCC, 0xDAAA00]

        color = QColor(colorTable[shape])
        painter.fillRect(x + , y + , self.squareWidth() - ,
            self.squareHeight() - , color)

        painter.setPen(color.lighter())
        painter.drawLine(x, y + self.squareHeight() - , x, y)
        painter.drawLine(x, y, x + self.squareWidth() - , y)

        painter.setPen(color.darker())
        painter.drawLine(x + , y + self.squareHeight() - ,
            x + self.squareWidth() - , y + self.squareHeight() - )
        painter.drawLine(x + self.squareWidth() - ,
            y + self.squareHeight() - , x + self.squareWidth() - , y + )

class Tetrominoe(object):

    NoShape =
    ZShape =
    SShape =
    LineShape =
    TShape =
    SquareShape =
    LShape =
    MirroredLShape = 

class Shape(object):

    coordsTable = (
        ((, ),     (, ),     (, ),     (, )),
        ((, -),    (, ),     (-, ),    (-, )),
        ((, -),    (, ),     (, ),     (, )),
        ((, -),    (, ),     (, ),     (, )),
        ((-, ),    (, ),     (, ),     (, )),
        ((, ),     (, ),     (, ),     (, )),
        ((-, -),   (, -),    (, ),     (, )),
        ((, -),    (, -),    (, ),     (, ))
    )

    def __init__(self):

        self.coords = [[,] for i in range()]
        self.pieceShape = Tetrominoe.NoShape

        self.setShape(Tetrominoe.NoShape)

    def shape(self):
        '''returns shape'''

        return self.pieceShape

    def setShape(self, shape):
        '''sets a shape'''

        table = Shape.coordsTable[shape]

        for i in range():
            for j in range():
                self.coords[i][j] = table[i][j]

        self.pieceShape = shape

    def setRandomShape(self):
        '''chooses a random shape'''

        self.setShape(random.randint(, ))

    def x(self, index):
        '''returns x coordinate'''

        return self.coords[index][]

    def y(self, index):
        '''returns y coordinate'''

        return self.coords[index][]

    def setX(self, index, x):
        '''sets x coordinate'''

        self.coords[index][] = x

    def setY(self, index, y):
        '''sets y coordinate'''

        self.coords[index][] = y

    def minX(self):
        '''returns min x value'''

        m = self.coords[][]
        for i in range():
            m = min(m, self.coords[i][])

        return m

    def maxX(self):
        '''returns max x value'''

        m = self.coords[][]
        for i in range():
            m = max(m, self.coords[i][])

        return m

    def minY(self):
        '''returns min y value'''

        m = self.coords[][]
        for i in range():
            m = min(m, self.coords[i][])

        return m

    def maxY(self):
        '''returns max y value'''

        m = self.coords[][]
        for i in range():
            m = max(m, self.coords[i][])

        return m

    def rotateLeft(self):
        '''rotates shape to the left'''

        if self.pieceShape == Tetrominoe.SquareShape:
            return self

        result = Shape()
        result.pieceShape = self.pieceShape

        for i in range():

            result.setX(i, self.y(i))
            result.setY(i, -self.x(i))

        return result

    def rotateRight(self):
        '''rotates shape to the right'''

        if self.pieceShape == Tetrominoe.SquareShape:
            return self

        result = Shape()
        result.pieceShape = self.pieceShape

        for i in range():

            result.setX(i, -self.y(i))
            result.setY(i, self.x(i))

        return result

if __name__ == '__main__':

    app = QApplication([])
    tetris = Tetris()
    sys.exit(app.exec_())