Qt 4.8: tetrixboard.cpp Example File (script/qstetrix/tetrixboard.cpp)

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# tetrixboard.cpp Example File

script/qstetrix/tetrixboard.cpp

     /****************************************************************************
     **
     ** Copyright (C) 2015 The Qt Company Ltd.
     ** Contact: http://www.qt.io/licensing/
     **
     ** This file is part of the 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.
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     **
     ** 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
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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)
     {
         nextPieceLbl = qobject_cast<QLabel*>(label);
     }

     QLabel *TetrixBoard::nextPieceLabel() const
     {
         return nextPieceLbl;
     }

     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();
     }