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# tetrixboard.cpp Example File
widgets/tetrix/tetrixboard.cpp

        #include <QtGui>

        #include "tetrixboard.h"

        TetrixBoard::TetrixBoard(QWidget *parent)
            : QFrame(parent)
        {
            setFrameStyle(QFrame::Panel | QFrame::Sunken);
            isStarted = false;
            isPaused = false;
            clearBoard();

            nextPiece.setRandomShape();
        }

        void TetrixBoard::setNextPieceLabel(QLabel *label)
        {
            nextPieceLabel = label;
        }

        QSize TetrixBoard::sizeHint() const
        {
            return QSize(BoardWidth * 15 + frameWidth() * 2,
                         BoardHeight * 15 + frameWidth() * 2);
        }

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

        void TetrixBoard::start()
        {
            if (isPaused)
                return;

            isStarted = true;
            isWaitingAfterLine = false;
            numLinesRemoved = 0;
            numPiecesDropped = 0;
            score = 0;
            level = 1;
            clearBoard();

            emit linesRemovedChanged(numLinesRemoved);
            emit scoreChanged(score);
            emit levelChanged(level);

            newPiece();
            timer.start(timeoutTime(), this);
        }

        void TetrixBoard::pause()
        {
            if (!isStarted)
                return;

            isPaused = !isPaused;
            if (isPaused) {
                timer.stop();
            } else {
                timer.start(timeoutTime(), this);
            }
            update();
        }

        void TetrixBoard::paintEvent(QPaintEvent *)
        {
            QPainter painter(this);
            QRect rect = contentsRect();

            drawFrame(&painter);

            if (isPaused) {
                painter.drawText(rect, Qt::AlignCenter, tr("Pause"));
                return;
            }

            int boardTop = rect.bottom() - BoardHeight*squareHeight();

            for (int i = 0; i < BoardHeight; ++i) {
                for (int j = 0; j < BoardWidth; ++j) {
                    TetrixShape shape = shapeAt(j, BoardHeight - i - 1);
                    if (shape != NoShape)
                        drawSquare(painter, rect.left() + j * squareWidth(),
                                   boardTop + i * squareHeight(), shape);
                }
            }

            if (curPiece.shape() != NoShape) {
                for (int i = 0; i < 4; ++i) {
                    int x = curX + curPiece.x(i);
                    int y = curY - curPiece.y(i);
                    drawSquare(painter, rect.left() + x * squareWidth(),
                               boardTop + (BoardHeight - y - 1) * squareHeight(),
                               curPiece.shape());
                }
            }
        }

        void TetrixBoard::keyPressEvent(QKeyEvent *event)
        {
            if (!isStarted || isPaused || curPiece.shape() == NoShape) {
                QWidget::keyPressEvent(event);
                return;
            }

            switch (event->key()) {
            case Qt::Key_Left:
                tryMove(curPiece, curX - 1, curY);
                break;
            case Qt::Key_Right:
                tryMove(curPiece, curX + 1, curY);
                break;
            case Qt::Key_Down:
                tryMove(curPiece.rotatedRight(), curX, curY);
                break;
            case Qt::Key_Up:
                tryMove(curPiece.rotatedLeft(), curX, curY);
                break;
            case Qt::Key_Space:
                dropDown();
                break;
            case Qt::Key_D:
                oneLineDown();
                break;
            default:
                QWidget::keyPressEvent(event);
            }
        }

        void TetrixBoard::timerEvent(QTimerEvent *event)
        {
            if (event->timerId() == timer.timerId()) {
                if (isWaitingAfterLine) {
                    isWaitingAfterLine = false;
                    newPiece();
                    timer.start(timeoutTime(), this);
                } else {
                    oneLineDown();
                }
            } else {
                QFrame::timerEvent(event);
            }
        }

        void TetrixBoard::clearBoard()
        {
            for (int i = 0; i < BoardHeight * BoardWidth; ++i)
                board[i] = NoShape;
        }

        void TetrixBoard::dropDown()
        {
            int dropHeight = 0;
            int newY = curY;
            while (newY > 0) {
                if (!tryMove(curPiece, curX, newY - 1))
                    break;
                --newY;
                ++dropHeight;
            }
            pieceDropped(dropHeight);
        }

        void TetrixBoard::oneLineDown()
        {
            if (!tryMove(curPiece, curX, curY - 1))
                pieceDropped(0);
        }

        void TetrixBoard::pieceDropped(int dropHeight)
        {
            for (int i = 0; i < 4; ++i) {
                int x = curX + curPiece.x(i);
                int y = curY - curPiece.y(i);
                shapeAt(x, y) = curPiece.shape();
            }

            ++numPiecesDropped;
            if (numPiecesDropped % 25 == 0) {
                ++level;
                timer.start(timeoutTime(), this);
                emit levelChanged(level);
            }

            score += dropHeight + 7;
            emit scoreChanged(score);
            removeFullLines();

            if (!isWaitingAfterLine)
                newPiece();
        }

        void TetrixBoard::removeFullLines()
        {
            int numFullLines = 0;

            for (int i = BoardHeight - 1; i >= 0; --i) {
                bool lineIsFull = true;

                for (int j = 0; j < BoardWidth; ++j) {
                    if (shapeAt(j, i) == NoShape) {
                        lineIsFull = false;
                        break;
                    }
                }

                if (lineIsFull) {
                    ++numFullLines;
                    for (int k = i; k < BoardHeight - 1; ++k) {
                        for (int j = 0; j < BoardWidth; ++j)
                            shapeAt(j, k) = shapeAt(j, k + 1);
                    }
                    for (int j = 0; j < BoardWidth; ++j)
                        shapeAt(j, BoardHeight - 1) = NoShape;
                }
            }

            if (numFullLines > 0) {
                numLinesRemoved += numFullLines;
                score += 10 * numFullLines;
                emit linesRemovedChanged(numLinesRemoved);
                emit scoreChanged(score);

                timer.start(500, this);
                isWaitingAfterLine = true;
                curPiece.setShape(NoShape);
                update();
            }
        }

        void TetrixBoard::newPiece()
        {
            curPiece = nextPiece;
            nextPiece.setRandomShape();
            showNextPiece();
            curX = BoardWidth / 2 + 1;
            curY = BoardHeight - 1 + curPiece.minY();

            if (!tryMove(curPiece, curX, curY)) {
                curPiece.setShape(NoShape);
                timer.stop();
                isStarted = false;
            }
        }

        void TetrixBoard::showNextPiece()
        {
            if (!nextPieceLabel)
                return;

            int dx = nextPiece.maxX() - nextPiece.minX() + 1;
            int dy = nextPiece.maxY() - nextPiece.minY() + 1;

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

            for (int i = 0; i < 4; ++i) {
                int x = nextPiece.x(i) - nextPiece.minX();
                int y = nextPiece.y(i) - nextPiece.minY();
                drawSquare(painter, x * squareWidth(), y * squareHeight(),
                           nextPiece.shape());
            }
            nextPieceLabel->setPixmap(pixmap);
        }

        bool TetrixBoard::tryMove(const TetrixPiece &newPiece, int newX, int newY)
        {
            for (int i = 0; i < 4; ++i) {
                int x = newX + newPiece.x(i);
                int y = newY - newPiece.y(i);
                if (x < 0 || x >= BoardWidth || y < 0 || y >= BoardHeight)
                    return false;
                if (shapeAt(x, y) != NoShape)
                    return false;
            }

            curPiece = newPiece;
            curX = newX;
            curY = newY;
            update();
            return true;
        }

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

            QColor color = colorTable[int(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);
        }