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tetrixboard.cpp Example File
script/qstetrix/tetrixboard.cpp

 /****************************************************************************
 **
 ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
 ** All rights reserved.
 ** Contact: Nokia Corporation (qt-info@nokia.com)
 **
 ** This file is part of the examples of the Qt Toolkit.
 **
 ** $QT_BEGIN_LICENSE:LGPL$
 ** Commercial Usage
 ** Licensees holding valid Qt Commercial licenses may use this file in
 ** accordance with the Qt Commercial License Agreement provided with the
 ** Software or, alternatively, in accordance with the terms contained in
 ** a written agreement between you and Nokia.
 **
 ** GNU Lesser General Public License Usage
 ** Alternatively, this file may be used under the terms of the GNU Lesser
 ** General Public License version 2.1 as published by the Free Software
 ** Foundation and appearing in the file LICENSE.LGPL included in the
 ** packaging of this file.  Please review the following information to
 ** ensure the GNU Lesser General Public License version 2.1 requirements
 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
 **
 ** In addition, as a special exception, Nokia gives you certain additional
 ** rights.  These rights are described in the Nokia Qt LGPL Exception
 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
 **
 ** GNU General Public License Usage
 ** Alternatively, this file may be used under the terms of the GNU
 ** General Public License version 3.0 as published by the Free Software
 ** Foundation and appearing in the file LICENSE.GPL included in the
 ** packaging of this file.  Please review the following information to
 ** ensure the GNU General Public License version 3.0 requirements will be
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 ****************************************************************************/

 #include "tetrixboard.h"

 #include <QtGui>

 Q_DECLARE_METATYPE(QPainter*)

 TetrixBoard::TetrixBoard(QWidget *parent)
     : QFrame(parent)
 {
     timer = new QTimer(this);
     qMetaTypeId<QPainter*>();
 }

 void TetrixBoard::setNextPieceLabel(QWidget *label)
 {
     nextPieceLabel = qobject_cast<QLabel*>(label);
 }

 QObject *TetrixBoard::getTimer()
 {
     return timer;
 }

 QSize TetrixBoard::minimumSizeHint() const
 {
     return QSize(BoardWidth * 5 + frameWidth() * 2,
                  BoardHeight * 5 + frameWidth() * 2);
 }

 void TetrixBoard::paintEvent(QPaintEvent *event)
 {
     QFrame::paintEvent(event);
     QPainter painter(this);
     painter.drawImage(0, 0, image);
 }

 void TetrixBoard::keyPressEvent(QKeyEvent *event)
 {
     emit keyPressed(event->key());
 }

 void TetrixBoard::showNextPiece(int width, int height)
 {
     if (!nextPieceLabel)
         return;

     QPixmap pixmap(width * squareWidth(), height * squareHeight());
     QPainter painter(&pixmap);
     painter.fillRect(pixmap.rect(), nextPieceLabel->palette().background());

     emit paintNextPieceRequested(&painter);

     nextPieceLabel->setPixmap(pixmap);
 }

 void TetrixBoard::drawPauseScreen(QPainter *painter)
 {
     painter->drawText(contentsRect(), Qt::AlignCenter, tr("Pause"));
 }

 void TetrixBoard::drawSquare(QPainter *painter, int x, int y, int shape)
 {
     static const QRgb colorTable[8] = {
         0x000000, 0xCC6666, 0x66CC66, 0x6666CC,
         0xCCCC66, 0xCC66CC, 0x66CCCC, 0xDAAA00
     };

     x = x*squareWidth();
     y = y*squareHeight();

     QColor color = colorTable[shape];
     painter->fillRect(x + 1, y + 1, squareWidth() - 2, squareHeight() - 2,
                       color);

     painter->setPen(color.light());
     painter->drawLine(x, y + squareHeight() - 1, x, y);
     painter->drawLine(x, y, x + squareWidth() - 1, y);

     painter->setPen(color.dark());
     painter->drawLine(x + 1, y + squareHeight() - 1,
                       x + squareWidth() - 1, y + squareHeight() - 1);
     painter->drawLine(x + squareWidth() - 1, y + squareHeight() - 1,
                       x + squareWidth() - 1, y + 1);
 }

 void TetrixBoard::update()
 {
     QRect rect = contentsRect();
     if (image.size() != rect.size())
         image = QImage(rect.size(), QImage::Format_ARGB32_Premultiplied);
     image.fill(qRgba(0,0,0,0));
     QPainter painter;
     painter.begin(&image);
     int boardTop = rect.bottom() - BoardHeight*squareHeight();
     painter.translate(rect.left(), boardTop);
     emit paintRequested(&painter);
     QFrame::update();
 }

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