Move examples from submodule to pyside-setup

Move PySide2 examples that are owned by the Qt Company
to a new examples directory.

Done-with: Venugopal Shivashankar <Venugopal.Shivashankar@qt.io>
Task-number: PYSIDE-363
Change-Id: I14099764d9eef2bc35e067086121427955862e3a
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>

2 files changed, 788 insertions, 0 deletions

diff --git a/examples/widgets/widgets/hellogl_openglwidget_legacy.py b/examples/widgets/widgets/hellogl_openglwidget_legacy.py
new file mode 100755
index 000000000..c2e918671
--- /dev/null
+++ b/examples/widgets/widgets/hellogl_openglwidget_legacy.py
@@ -0,0 +1,289 @@
+#!/usr/bin/env python
+
+############################################################################
+##
+## Copyright (C) 2017 The Qt Company Ltd.
+## Contact: http://www.qt.io/licensing/
+##
+## This file is part of the PySide examples of the Qt Toolkit.
+##
+## $QT_BEGIN_LICENSE:BSD$
+## You may use this file under the terms of the BSD license as follows:
+##
+## "Redistribution and use in source and binary forms, with or without
+## modification, are permitted provided that the following conditions are
+## met:
+##   * Redistributions of source code must retain the above copyright
+##     notice, this list of conditions and the following disclaimer.
+##   * Redistributions in binary form must reproduce the above copyright
+##     notice, this list of conditions and the following disclaimer in
+##     the documentation and/or other materials provided with the
+##     distribution.
+##   * Neither the name of The Qt Company Ltd nor the names of its
+##     contributors may be used to endorse or promote products derived
+##     from this software without specific prior written permission.
+##
+##
+## THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+## "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+## LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+## A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+## OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+## SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+## LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+## DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+## THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+## (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+## OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+##
+## $QT_END_LICENSE$
+##
+############################################################################
+
+"""PySide2 port of the opengl/legacy/hellogl example from Qt v5.x modified to use a QOpenGLWidget to demonstrate porting from QGLWidget to QOpenGLWidget"""
+
+import sys
+import math
+from PySide2 import QtCore, QtGui, QtWidgets
+
+try:
+    from OpenGL import GL
+except ImportError:
+    app = QtWidgets.QApplication(sys.argv)
+    messageBox = QtWidgets.QMessageBox(QtWidgets.QMessageBox.Critical, "OpenGL hellogl",
+                                       "PyOpenGL must be installed to run this example.",
+                                       QtWidgets.QMessageBox.Close)
+    messageBox.setDetailedText("Run:\npip install PyOpenGL PyOpenGL_accelerate")
+    messageBox.exec_()
+    sys.exit(1)
+
+
+class Window(QtWidgets.QWidget):
+    def __init__(self, parent=None):
+        QtWidgets.QWidget.__init__(self, parent)
+
+        self.glWidget = GLWidget()
+
+        self.xSlider = self.createSlider(QtCore.SIGNAL("xRotationChanged(int)"),
+                                         self.glWidget.setXRotation)
+        self.ySlider = self.createSlider(QtCore.SIGNAL("yRotationChanged(int)"),
+                                         self.glWidget.setYRotation)
+        self.zSlider = self.createSlider(QtCore.SIGNAL("zRotationChanged(int)"),
+                                         self.glWidget.setZRotation)
+
+        mainLayout = QtWidgets.QHBoxLayout()
+        mainLayout.addWidget(self.glWidget)
+        mainLayout.addWidget(self.xSlider)
+        mainLayout.addWidget(self.ySlider)
+        mainLayout.addWidget(self.zSlider)
+        self.setLayout(mainLayout)
+
+        self.xSlider.setValue(170 * 16)
+        self.ySlider.setValue(160 * 16)
+        self.zSlider.setValue(90 * 16)
+
+        self.setWindowTitle(self.tr("QOpenGLWidget"))
+
+    def createSlider(self, changedSignal, setterSlot):
+        slider = QtWidgets.QSlider(QtCore.Qt.Vertical)
+
+        slider.setRange(0, 360 * 16)
+        slider.setSingleStep(16)
+        slider.setPageStep(15 * 16)
+        slider.setTickInterval(15 * 16)
+        slider.setTickPosition(QtWidgets.QSlider.TicksRight)
+
+        self.glWidget.connect(slider, QtCore.SIGNAL("valueChanged(int)"), setterSlot)
+        self.connect(self.glWidget, changedSignal, slider, QtCore.SLOT("setValue(int)"))
+
+        return slider
+
+
+class GLWidget(QtWidgets.QOpenGLWidget):
+    xRotationChanged = QtCore.Signal(int)
+    yRotationChanged = QtCore.Signal(int)
+    zRotationChanged = QtCore.Signal(int)
+
+    def __init__(self, parent=None):
+        QtWidgets.QOpenGLWidget.__init__(self, parent)
+
+        self.object = 0
+        self.xRot = 0
+        self.yRot = 0
+        self.zRot = 0
+
+        self.lastPos = QtCore.QPoint()
+
+        self.trolltechGreen = QtGui.QColor.fromCmykF(0.40, 0.0, 1.0, 0.0)
+        self.trolltechPurple = QtGui.QColor.fromCmykF(0.39, 0.39, 0.0, 0.0)
+
+    def xRotation(self):
+        return self.xRot
+
+    def yRotation(self):
+        return self.yRot
+
+    def zRotation(self):
+        return self.zRot
+
+    def minimumSizeHint(self):
+        return QtCore.QSize(50, 50)
+
+    def sizeHint(self):
+        return QtCore.QSize(400, 400)
+
+    def setXRotation(self, angle):
+        angle = self.normalizeAngle(angle)
+        if angle != self.xRot:
+            self.xRot = angle
+            self.emit(QtCore.SIGNAL("xRotationChanged(int)"), angle)
+            self.update()
+
+    def setYRotation(self, angle):
+        angle = self.normalizeAngle(angle)
+        if angle != self.yRot:
+            self.yRot = angle
+            self.emit(QtCore.SIGNAL("yRotationChanged(int)"), angle)
+            self.update()
+
+    def setZRotation(self, angle):
+        angle = self.normalizeAngle(angle)
+        if angle != self.zRot:
+            self.zRot = angle
+            self.emit(QtCore.SIGNAL("zRotationChanged(int)"), angle)
+            self.update()
+
+    def initializeGL(self):
+        darkTrolltechPurple = self.trolltechPurple.darker()
+        GL.glClearColor(darkTrolltechPurple.redF(), darkTrolltechPurple.greenF(), darkTrolltechPurple.blueF(), darkTrolltechPurple.alphaF())
+        self.object = self.makeObject()
+        GL.glShadeModel(GL.GL_FLAT)
+        GL.glEnable(GL.GL_DEPTH_TEST)
+        GL.glEnable(GL.GL_CULL_FACE)
+
+    def paintGL(self):
+        GL.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT)
+        GL.glLoadIdentity()
+        GL.glTranslated(0.0, 0.0, -10.0)
+        GL.glRotated(self.xRot / 16.0, 1.0, 0.0, 0.0)
+        GL.glRotated(self.yRot / 16.0, 0.0, 1.0, 0.0)
+        GL.glRotated(self.zRot / 16.0, 0.0, 0.0, 1.0)
+        GL.glCallList(self.object)
+
+    def resizeGL(self, width, height):
+        side = min(width, height)
+        GL.glViewport(int((width - side) / 2),int((height - side) / 2), side, side)
+
+        GL.glMatrixMode(GL.GL_PROJECTION)
+        GL.glLoadIdentity()
+        GL.glOrtho(-0.5, +0.5, -0.5, +0.5, 4.0, 15.0)
+        GL.glMatrixMode(GL.GL_MODELVIEW)
+
+    def mousePressEvent(self, event):
+        self.lastPos = QtCore.QPoint(event.pos())
+
+    def mouseMoveEvent(self, event):
+        dx = event.x() - self.lastPos.x()
+        dy = event.y() - self.lastPos.y()
+
+        if event.buttons() & QtCore.Qt.LeftButton:
+            self.setXRotation(self.xRot + 8 * dy)
+            self.setYRotation(self.yRot + 8 * dx)
+        elif event.buttons() & QtCore.Qt.RightButton:
+            self.setXRotation(self.xRot + 8 * dy)
+            self.setZRotation(self.zRot + 8 * dx)
+
+        self.lastPos = QtCore.QPoint(event.pos())
+
+    def makeObject(self):
+        genList = GL.glGenLists(1)
+        GL.glNewList(genList, GL.GL_COMPILE)
+
+        GL.glBegin(GL.GL_QUADS)
+
+        x1 = +0.06
+        y1 = -0.14
+        x2 = +0.14
+        y2 = -0.06
+        x3 = +0.08
+        y3 = +0.00
+        x4 = +0.30
+        y4 = +0.22
+
+        self.quad(x1, y1, x2, y2, y2, x2, y1, x1)
+        self.quad(x3, y3, x4, y4, y4, x4, y3, x3)
+
+        self.extrude(x1, y1, x2, y2)
+        self.extrude(x2, y2, y2, x2)
+        self.extrude(y2, x2, y1, x1)
+        self.extrude(y1, x1, x1, y1)
+        self.extrude(x3, y3, x4, y4)
+        self.extrude(x4, y4, y4, x4)
+        self.extrude(y4, x4, y3, x3)
+
+        Pi = 3.14159265358979323846
+        NumSectors = 200
+
+        for i in range(NumSectors):
+            angle1 = (i * 2 * Pi) / NumSectors
+            x5 = 0.30 * math.sin(angle1)
+            y5 = 0.30 * math.cos(angle1)
+            x6 = 0.20 * math.sin(angle1)
+            y6 = 0.20 * math.cos(angle1)
+
+            angle2 = ((i + 1) * 2 * Pi) / NumSectors
+            x7 = 0.20 * math.sin(angle2)
+            y7 = 0.20 * math.cos(angle2)
+            x8 = 0.30 * math.sin(angle2)
+            y8 = 0.30 * math.cos(angle2)
+
+            self.quad(x5, y5, x6, y6, x7, y7, x8, y8)
+
+            self.extrude(x6, y6, x7, y7)
+            self.extrude(x8, y8, x5, y5)
+
+        GL.glEnd()
+        GL.glEndList()
+
+        return genList
+
+    def quad(self, x1, y1, x2, y2, x3, y3, x4, y4):
+        GL.glColor(self.trolltechGreen.redF(), self.trolltechGreen.greenF(), self.trolltechGreen.blueF(), self.trolltechGreen.alphaF())
+
+        GL.glVertex3d(x1, y1, +0.05)
+        GL.glVertex3d(x2, y2, +0.05)
+        GL.glVertex3d(x3, y3, +0.05)
+        GL.glVertex3d(x4, y4, +0.05)
+
+        GL.glVertex3d(x4, y4, -0.05)
+        GL.glVertex3d(x3, y3, -0.05)
+        GL.glVertex3d(x2, y2, -0.05)
+        GL.glVertex3d(x1, y1, -0.05)
+
+    def extrude(self, x1, y1, x2, y2):
+        darkTrolltechGreen = self.trolltechGreen.darker(250 + int(100 * x1))
+        GL.glColor(darkTrolltechGreen.redF(), darkTrolltechGreen.greenF(), darkTrolltechGreen.blueF(), darkTrolltechGreen.alphaF())
+
+        GL.glVertex3d(x1, y1, -0.05)
+        GL.glVertex3d(x2, y2, -0.05)
+        GL.glVertex3d(x2, y2, +0.05)
+        GL.glVertex3d(x1, y1, +0.05)
+
+    def normalizeAngle(self, angle):
+        while angle < 0:
+            angle += 360 * 16
+        while angle > 360 * 16:
+            angle -= 360 * 16
+        return angle
+
+    def freeResources(self):
+        self.makeCurrent()
+        GL.glDeleteLists(self.object, 1)
+
+if __name__ == '__main__':
+    app = QtWidgets.QApplication(sys.argv)
+    window = Window()
+    window.show()
+    res = app.exec_()
+    window.glWidget.freeResources()
+    sys.exit(res)
diff --git a/examples/widgets/widgets/tetrix.py b/examples/widgets/widgets/tetrix.py
new file mode 100644
index 000000000..9045ac7af
--- /dev/null
+++ b/examples/widgets/widgets/tetrix.py
@@ -0,0 +1,499 @@
+#!/usr/bin/env python
+
+#############################################################################
+##
+## Copyright (C) 2013 Riverbank Computing Limited.
+## Copyright (C) 2016 The Qt Company Ltd.
+## Contact: http://www.qt.io/licensing/
+##
+## This file is part of the PySide examples of the Qt Toolkit.
+##
+## $QT_BEGIN_LICENSE:BSD$
+## You may use this file under the terms of the BSD license as follows:
+##
+## "Redistribution and use in source and binary forms, with or without
+## modification, are permitted provided that the following conditions are
+## met:
+##   * Redistributions of source code must retain the above copyright
+##     notice, this list of conditions and the following disclaimer.
+##   * Redistributions in binary form must reproduce the above copyright
+##     notice, this list of conditions and the following disclaimer in
+##     the documentation and/or other materials provided with the
+##     distribution.
+##   * Neither the name of The Qt Company Ltd nor the names of its
+##     contributors may be used to endorse or promote products derived
+##     from this software without specific prior written permission.
+##
+##
+## THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+## "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+## LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+## A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+## OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+## SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+## LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+## DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+## THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+## (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+## OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+##
+## $QT_END_LICENSE$
+##
+#############################################################################
+
+"""PySide2 port of the widgets/widgets/tetrix example from Qt v5.x"""
+
+import random
+
+from PySide2 import QtCore, QtGui, QtWidgets
+
+
+NoShape, ZShape, SShape, LineShape, TShape, SquareShape, LShape, MirroredLShape = range(8)
+
+
+class TetrixWindow(QtWidgets.QWidget):
+    def __init__(self):
+        super(TetrixWindow, self).__init__()
+
+        self.board = TetrixBoard()
+
+        nextPieceLabel = QtWidgets.QLabel()
+        nextPieceLabel.setFrameStyle(QtWidgets.QFrame.Box | QtWidgets.QFrame.Raised)
+        nextPieceLabel.setAlignment(QtCore.Qt.AlignCenter)
+        self.board.setNextPieceLabel(nextPieceLabel)
+
+        scoreLcd = QtWidgets.QLCDNumber(5)
+        scoreLcd.setSegmentStyle(QtWidgets.QLCDNumber.Filled)
+        levelLcd = QtWidgets.QLCDNumber(2)
+        levelLcd.setSegmentStyle(QtWidgets.QLCDNumber.Filled)
+        linesLcd = QtWidgets.QLCDNumber(5)
+        linesLcd.setSegmentStyle(QtWidgets.QLCDNumber.Filled)
+
+        startButton = QtWidgets.QPushButton("&Start")
+        startButton.setFocusPolicy(QtCore.Qt.NoFocus)
+        quitButton = QtWidgets.QPushButton("&Quit")
+        quitButton.setFocusPolicy(QtCore.Qt.NoFocus)
+        pauseButton = QtWidgets.QPushButton("&Pause")
+        pauseButton.setFocusPolicy(QtCore.Qt.NoFocus)
+
+        startButton.clicked.connect(self.board.start)
+        pauseButton.clicked.connect(self.board.pause)
+        quitButton.clicked.connect(QtWidgets.qApp.quit)
+        self.board.scoreChanged.connect(scoreLcd.display)
+        self.board.levelChanged.connect(levelLcd.display)
+        self.board.linesRemovedChanged.connect(linesLcd.display)
+
+        layout = QtWidgets.QGridLayout()
+        layout.addWidget(self.createLabel("NEXT"), 0, 0)
+        layout.addWidget(nextPieceLabel, 1, 0)
+        layout.addWidget(self.createLabel("LEVEL"), 2, 0)
+        layout.addWidget(levelLcd, 3, 0)
+        layout.addWidget(startButton, 4, 0)
+        layout.addWidget(self.board, 0, 1, 6, 1)
+        layout.addWidget(self.createLabel("SCORE"), 0, 2)
+        layout.addWidget(scoreLcd, 1, 2)
+        layout.addWidget(self.createLabel("LINES REMOVED"), 2, 2)
+        layout.addWidget(linesLcd, 3, 2)
+        layout.addWidget(quitButton, 4, 2)
+        layout.addWidget(pauseButton, 5, 2)
+        self.setLayout(layout)
+
+        self.setWindowTitle("Tetrix")
+        self.resize(550, 370)
+
+    def createLabel(self, text):
+        lbl = QtWidgets.QLabel(text)
+        lbl.setAlignment(QtCore.Qt.AlignHCenter | QtCore.Qt.AlignBottom)
+        return lbl
+
+
+class TetrixBoard(QtWidgets.QFrame):
+    BoardWidth = 10
+    BoardHeight = 22
+
+    scoreChanged = QtCore.Signal(int)
+
+    levelChanged = QtCore.Signal(int)
+
+    linesRemovedChanged = QtCore.Signal(int)
+
+    def __init__(self, parent=None):
+        super(TetrixBoard, self).__init__(parent)
+
+        self.timer = QtCore.QBasicTimer()
+        self.nextPieceLabel = None
+        self.isWaitingAfterLine = False
+        self.curPiece = TetrixPiece()
+        self.nextPiece = TetrixPiece()
+        self.curX = 0
+        self.curY = 0
+        self.numLinesRemoved = 0
+        self.numPiecesDropped = 0
+        self.score = 0
+        self.level = 0
+        self.board = None
+
+        self.setFrameStyle(QtWidgets.QFrame.Panel | QtWidgets.QFrame.Sunken)
+        self.setFocusPolicy(QtCore.Qt.StrongFocus)
+        self.isStarted = False
+        self.isPaused = False
+        self.clearBoard()
+
+        self.nextPiece.setRandomShape()
+
+    def shapeAt(self, x, y):
+        return self.board[(y * TetrixBoard.BoardWidth) + x]
+
+    def setShapeAt(self, x, y, shape):
+        self.board[(y * TetrixBoard.BoardWidth) + x] = shape
+
+    def timeoutTime(self):
+        return 1000 / (1 + self.level)
+
+    def squareWidth(self):
+        return self.contentsRect().width() / TetrixBoard.BoardWidth
+
+    def squareHeight(self):
+        return self.contentsRect().height() / TetrixBoard.BoardHeight
+
+    def setNextPieceLabel(self, label):
+        self.nextPieceLabel = label
+
+    def sizeHint(self):
+        return QtCore.QSize(TetrixBoard.BoardWidth * 15 + self.frameWidth() * 2,
+                TetrixBoard.BoardHeight * 15 + self.frameWidth() * 2)
+
+    def minimumSizeHint(self):
+        return QtCore.QSize(TetrixBoard.BoardWidth * 5 + self.frameWidth() * 2,
+                TetrixBoard.BoardHeight * 5 + self.frameWidth() * 2)
+
+    def start(self):
+        if self.isPaused:
+            return
+
+        self.isStarted = True
+        self.isWaitingAfterLine = False
+        self.numLinesRemoved = 0
+        self.numPiecesDropped = 0
+        self.score = 0
+        self.level = 1
+        self.clearBoard()
+
+        self.linesRemovedChanged.emit(self.numLinesRemoved)
+        self.scoreChanged.emit(self.score)
+        self.levelChanged.emit(self.level)
+
+        self.newPiece()
+        self.timer.start(self.timeoutTime(), self)
+
+    def pause(self):
+        if not self.isStarted:
+            return
+
+        self.isPaused = not self.isPaused
+        if self.isPaused:
+            self.timer.stop()
+        else:
+            self.timer.start(self.timeoutTime(), self)
+
+        self.update()
+
+    def paintEvent(self, event):
+        super(TetrixBoard, self).paintEvent(event)
+
+        painter = QtGui.QPainter(self)
+        rect = self.contentsRect()
+
+        if self.isPaused:
+            painter.drawText(rect, QtCore.Qt.AlignCenter, "Pause")
+            return
+
+        boardTop = rect.bottom() - TetrixBoard.BoardHeight * self.squareHeight()
+
+        for i in range(TetrixBoard.BoardHeight):
+            for j in range(TetrixBoard.BoardWidth):
+                shape = self.shapeAt(j, TetrixBoard.BoardHeight - i - 1)
+                if shape != NoShape:
+                    self.drawSquare(painter,
+                            rect.left() + j * self.squareWidth(),
+                            boardTop + i * self.squareHeight(), shape)
+
+        if self.curPiece.shape() != NoShape:
+            for i in range(4):
+                x = self.curX + self.curPiece.x(i)
+                y = self.curY - self.curPiece.y(i)
+                self.drawSquare(painter, rect.left() + x * self.squareWidth(),
+                        boardTop + (TetrixBoard.BoardHeight - y - 1) * self.squareHeight(),
+                        self.curPiece.shape())
+
+    def keyPressEvent(self, event):
+        if not self.isStarted or self.isPaused or self.curPiece.shape() == NoShape:
+            super(TetrixBoard, self).keyPressEvent(event)
+            return
+
+        key = event.key()
+        if key == QtCore.Qt.Key_Left:
+            self.tryMove(self.curPiece, self.curX - 1, self.curY)
+        elif key == QtCore.Qt.Key_Right:
+            self.tryMove(self.curPiece, self.curX + 1, self.curY)
+        elif key == QtCore.Qt.Key_Down:
+            self.tryMove(self.curPiece.rotatedRight(), self.curX, self.curY)
+        elif key == QtCore.Qt.Key_Up:
+            self.tryMove(self.curPiece.rotatedLeft(), self.curX, self.curY)
+        elif key == QtCore.Qt.Key_Space:
+            self.dropDown()
+        elif key == QtCore.Qt.Key_D:
+            self.oneLineDown()
+        else:
+            super(TetrixBoard, self).keyPressEvent(event)
+
+    def timerEvent(self, event):
+        if event.timerId() == self.timer.timerId():
+            if self.isWaitingAfterLine:
+                self.isWaitingAfterLine = False
+                self.newPiece()
+                self.timer.start(self.timeoutTime(), self)
+            else:
+                self.oneLineDown()
+        else:
+            super(TetrixBoard, self).timerEvent(event)
+
+    def clearBoard(self):
+        self.board = [NoShape for i in range(TetrixBoard.BoardHeight * TetrixBoard.BoardWidth)]
+
+    def dropDown(self):
+        dropHeight = 0
+        newY = self.curY
+        while newY > 0:
+            if not self.tryMove(self.curPiece, self.curX, newY - 1):
+                break
+            newY -= 1
+            dropHeight += 1
+
+        self.pieceDropped(dropHeight)
+
+    def oneLineDown(self):
+        if not self.tryMove(self.curPiece, self.curX, self.curY - 1):
+            self.pieceDropped(0)
+
+    def pieceDropped(self, dropHeight):
+        for i in range(4):
+            x = self.curX + self.curPiece.x(i)
+            y = self.curY - self.curPiece.y(i)
+            self.setShapeAt(x, y, self.curPiece.shape())
+
+        self.numPiecesDropped += 1
+        if self.numPiecesDropped % 25 == 0:
+            self.level += 1
+            self.timer.start(self.timeoutTime(), self)
+            self.levelChanged.emit(self.level)
+
+        self.score += dropHeight + 7
+        self.scoreChanged.emit(self.score)
+        self.removeFullLines()
+
+        if not self.isWaitingAfterLine:
+            self.newPiece()
+
+    def removeFullLines(self):
+        numFullLines = 0
+
+        for i in range(TetrixBoard.BoardHeight - 1, -1, -1):
+            lineIsFull = True
+
+            for j in range(TetrixBoard.BoardWidth):
+                if self.shapeAt(j, i) == NoShape:
+                    lineIsFull = False
+                    break
+
+            if lineIsFull:
+                numFullLines += 1
+                for k in range(TetrixBoard.BoardHeight - 1):
+                    for j in range(TetrixBoard.BoardWidth):
+                        self.setShapeAt(j, k, self.shapeAt(j, k + 1))
+
+                for j in range(TetrixBoard.BoardWidth):
+                    self.setShapeAt(j, TetrixBoard.BoardHeight - 1, NoShape)
+
+        if numFullLines > 0:
+            self.numLinesRemoved += numFullLines
+            self.score += 10 * numFullLines
+            self.linesRemovedChanged.emit(self.numLinesRemoved)
+            self.scoreChanged.emit(self.score)
+
+            self.timer.start(500, self)
+            self.isWaitingAfterLine = True
+            self.curPiece.setShape(NoShape)
+            self.update()
+
+    def newPiece(self):
+        self.curPiece = self.nextPiece
+        self.nextPiece.setRandomShape()
+        self.showNextPiece()
+        self.curX = TetrixBoard.BoardWidth // 2 + 1
+        self.curY = TetrixBoard.BoardHeight - 1 + self.curPiece.minY()
+
+        if not self.tryMove(self.curPiece, self.curX, self.curY):
+            self.curPiece.setShape(NoShape)
+            self.timer.stop()
+            self.isStarted = False
+
+    def showNextPiece(self):
+        if self.nextPieceLabel is not None:
+            return
+
+        dx = self.nextPiece.maxX() - self.nextPiece.minX() + 1
+        dy = self.nextPiece.maxY() - self.nextPiece.minY() + 1
+
+        pixmap = QtGui.QPixmap(dx * self.squareWidth(), dy * self.squareHeight())
+        painter = QtGui.QPainter(pixmap)
+        painter.fillRect(pixmap.rect(), self.nextPieceLabel.palette().background())
+
+        for int in range(4):
+            x = self.nextPiece.x(i) - self.nextPiece.minX()
+            y = self.nextPiece.y(i) - self.nextPiece.minY()
+            self.drawSquare(painter, x * self.squareWidth(),
+                    y * self.squareHeight(), self.nextPiece.shape())
+
+        self.nextPieceLabel.setPixmap(pixmap)
+
+    def tryMove(self, newPiece, newX, newY):
+        for i in range(4):
+            x = newX + newPiece.x(i)
+            y = newY - newPiece.y(i)
+            if x < 0 or x >= TetrixBoard.BoardWidth or y < 0 or y >= TetrixBoard.BoardHeight:
+                return False
+            if self.shapeAt(x, y) != NoShape:
+                return False
+
+        self.curPiece = newPiece
+        self.curX = newX
+        self.curY = newY
+        self.update()
+        return True
+
+    def drawSquare(self, painter, x, y, shape):
+        colorTable = [0x000000, 0xCC6666, 0x66CC66, 0x6666CC,
+                      0xCCCC66, 0xCC66CC, 0x66CCCC, 0xDAAA00]
+
+        color = QtGui.QColor(colorTable[shape])
+        painter.fillRect(x + 1, y + 1, self.squareWidth() - 2,
+                self.squareHeight() - 2, color)
+
+        painter.setPen(color.lighter())
+        painter.drawLine(x, y + self.squareHeight() - 1, x, y)
+        painter.drawLine(x, y, x + self.squareWidth() - 1, y)
+
+        painter.setPen(color.darker())
+        painter.drawLine(x + 1, y + self.squareHeight() - 1,
+                x + self.squareWidth() - 1, y + self.squareHeight() - 1)
+        painter.drawLine(x + self.squareWidth() - 1,
+                y + self.squareHeight() - 1, x + self.squareWidth() - 1, y + 1)
+
+
+class TetrixPiece(object):
+    coordsTable = (
+        ((0, 0),     (0, 0),     (0, 0),     (0, 0)),
+        ((0, -1),    (0, 0),     (-1, 0),    (-1, 1)),
+        ((0, -1),    (0, 0),     (1, 0),     (1, 1)),
+        ((0, -1),    (0, 0),     (0, 1),     (0, 2)),
+        ((-1, 0),    (0, 0),     (1, 0),     (0, 1)),
+        ((0, 0),     (1, 0),     (0, 1),     (1, 1)),
+        ((-1, -1),   (0, -1),    (0, 0),     (0, 1)),
+        ((1, -1),    (0, -1),    (0, 0),     (0, 1))
+    )
+
+    def __init__(self):
+        self.coords = [[0,0] for _ in range(4)]
+        self.pieceShape = NoShape
+
+        self.setShape(NoShape)
+
+    def shape(self):
+        return self.pieceShape
+
+    def setShape(self, shape):
+        table = TetrixPiece.coordsTable[shape]
+        for i in range(4):
+            for j in range(2):
+                self.coords[i][j] = table[i][j]
+
+        self.pieceShape = shape
+
+    def setRandomShape(self):
+        self.setShape(random.randint(1, 7))
+
+    def x(self, index):
+        return self.coords[index][0]
+
+    def y(self, index):
+        return self.coords[index][1]
+
+    def setX(self, index, x):
+        self.coords[index][0] = x
+
+    def setY(self, index, y):
+        self.coords[index][1] = y
+
+    def minX(self):
+        m = self.coords[0][0]
+        for i in range(4):
+            m = min(m, self.coords[i][0])
+
+        return m
+
+    def maxX(self):
+        m = self.coords[0][0]
+        for i in range(4):
+            m = max(m, self.coords[i][0])
+
+        return m
+
+    def minY(self):
+        m = self.coords[0][1]
+        for i in range(4):
+            m = min(m, self.coords[i][1])
+
+        return m
+
+    def maxY(self):
+        m = self.coords[0][1]
+        for i in range(4):
+            m = max(m, self.coords[i][1])
+
+        return m
+
+    def rotatedLeft(self):
+        if self.pieceShape == SquareShape:
+            return self
+
+        result = TetrixPiece()
+        result.pieceShape = self.pieceShape
+        for i in range(4):
+            result.setX(i, self.y(i))
+            result.setY(i, -self.x(i))
+
+        return result
+
+    def rotatedRight(self):
+        if self.pieceShape == SquareShape:
+            return self
+
+        result = TetrixPiece()
+        result.pieceShape = self.pieceShape
+        for i in range(4):
+            result.setX(i, -self.y(i))
+            result.setY(i, self.x(i))
+
+        return result
+
+
+if __name__ == '__main__':
+
+    import sys
+
+    app = QtWidgets.QApplication(sys.argv)
+    window = TetrixWindow()
+    window.show()
+    random.seed(None)
+    sys.exit(app.exec_())