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2010-05-25T14:21:06Z

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==Tetrix game==

<source lang="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
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
** $QT_END_LICENSE$
**
****************************************************************************/

#ifndef TETRIXPIECE_H
#define TETRIXPIECE_H
enum TetrixShape { NoShape, ZShape, SShape, LineShape, TShape, SquareShape,
LShape, MirroredLShape };

class TetrixPiece
{
public:
TetrixPiece() { setShape(NoShape); }
void setRandomShape();
void setShape(TetrixShape shape);
TetrixShape shape() const { return pieceShape; }
int x(int index) const { return coords[index][0]; }
int y(int index) const { return coords[index][1]; }
int minX() const;
int maxX() const;
int minY() const;
int maxY() const;
TetrixPiece rotatedLeft() const;
TetrixPiece rotatedRight() const;
private:
void setX(int index, int x) { coords[index][0] = x; }
void setY(int index, int y) { coords[index][1] = y; }
TetrixShape pieceShape;
int coords[4][2];
};

#endif

#include <QtCore>
#include <stdlib.h>
#include "tetrixpiece.h"

void TetrixPiece::setRandomShape()
{
setShape(TetrixShape(qrand() % 7 + 1));
}

void TetrixPiece::setShape(TetrixShape shape)
{
static const int coordsTable[8][4][2] = {
{ { 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 } }
};
for (int i = 0; i < 4 ; i++) {
for (int j = 0; j < 2; ++j)
coords[i][j] = coordsTable[shape][i][j];
}
pieceShape = shape;

}

int TetrixPiece::minX() const
{
int min = coords[0][0];
for (int i = 1; i < 4; ++i)
min = qMin(min, coords[i][0]);
return min;
}
int TetrixPiece::maxX() const

{
int max = coords[0][0];
for (int i = 1; i < 4; ++i)
max = qMax(max, coords[i][0]);
return max;
}

int TetrixPiece::minY() const
{
int min = coords[0][1];
for (int i = 1; i < 4; ++i)
min = qMin(min, coords[i][1]);
return min;
}
int TetrixPiece::maxY() const

{
int max = coords[0][1];
for (int i = 1; i < 4; ++i)
max = qMax(max, coords[i][1]);
return max;
}

TetrixPiece TetrixPiece::rotatedLeft() const
{
if (pieceShape == SquareShape)
return *this;
TetrixPiece result;
result.pieceShape = pieceShape;
for (int i = 0; i < 4; ++i) {
result.setX(i, y(i));
result.setY(i, -x(i));
}
return result;
}

TetrixPiece TetrixPiece::rotatedRight() const
{
if (pieceShape == SquareShape)
return *this;
TetrixPiece result;
result.pieceShape = pieceShape;
for (int i = 0; i < 4; ++i) {
result.setX(i, -y(i));
result.setY(i, x(i));
}
return result;
}

#ifndef TETRIXBOARD_H
#define TETRIXBOARD_H
#include <QBasicTimer>
#include <QFrame>
#include <QPointer>
#include "tetrixpiece.h"
QT_BEGIN_NAMESPACE
class QLabel;
QT_END_NAMESPACE

class TetrixBoard : public QFrame
{
Q_OBJECT
public:
TetrixBoard(QWidget *parent = 0);
void setNextPieceLabel(QLabel *label);
QSize sizeHint() const;
QSize minimumSizeHint() const;
public slots:
void start();
void pause();
signals:
void scoreChanged(int score);
void levelChanged(int level);
void linesRemovedChanged(int numLines);
protected:
void paintEvent(QPaintEvent *event);
void keyPressEvent(QKeyEvent *event);
void timerEvent(QTimerEvent *event);

private:
enum { BoardWidth = 10, BoardHeight = 22 };
TetrixShape &shapeAt(int x, int y) { return board[(y * BoardWidth) + x]; }
int timeoutTime() { return 1000 / (1 + level); }
int squareWidth() { return contentsRect().width() / BoardWidth; }
int squareHeight() { return contentsRect().height() / BoardHeight; }
void clearBoard();
void dropDown();
void oneLineDown();
void pieceDropped(int dropHeight);
void removeFullLines();
void newPiece();
void showNextPiece();
bool tryMove(const TetrixPiece &newPiece, int newX, int newY);
void drawSquare(QPainter &painter, int x, int y, TetrixShape shape);
QBasicTimer timer;
QPointer<QLabel> nextPieceLabel;
bool isStarted;
bool isPaused;
bool isWaitingAfterLine;
TetrixPiece curPiece;
TetrixPiece nextPiece;
int curX;
int curY;
int numLinesRemoved;
int numPiecesDropped;
int score;
int level;
TetrixShape board[BoardWidth * BoardHeight];
};

#endif

#include <QtGui>
#include "tetrixboard.h"

TetrixBoard::TetrixBoard(QWidget *parent)
: QFrame(parent)
{
setFrameStyle(QFrame::Panel | QFrame::Sunken);
setFocusPolicy(Qt::StrongFocus);
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 *event)
{
QFrame::paintEvent(event);
QPainter painter(this);
QRect rect = contentsRect();

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) {
QFrame::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:
QFrame::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);
}

#ifndef TETRIXWINDOW_H
#define TETRIXWINDOW_H
#include <QFrame>
#include <QWidget>
QT_BEGIN_NAMESPACE
class QLCDNumber;
class QLabel;
class QPushButton;
QT_END_NAMESPACE
class TetrixBoard;

class TetrixWindow : public QWidget
{
Q_OBJECT
public:
TetrixWindow();
private:
QLabel *createLabel(const QString &text);
TetrixBoard *board;
QLabel *nextPieceLabel;
QLCDNumber *scoreLcd;
QLCDNumber *levelLcd;
QLCDNumber *linesLcd;
QPushButton *startButton;
QPushButton *quitButton;
QPushButton *pauseButton;
};

#endif

#include <QtGui>
#include "tetrixboard.h"
#include "tetrixwindow.h"

TetrixWindow::TetrixWindow()
{
board = new TetrixBoard;

nextPieceLabel = new QLabel;
nextPieceLabel->setFrameStyle(QFrame::Box | QFrame::Raised);
nextPieceLabel->setAlignment(Qt::AlignCenter);
board->setNextPieceLabel(nextPieceLabel);

scoreLcd = new QLCDNumber(5);
scoreLcd->setSegmentStyle(QLCDNumber::Filled);
levelLcd = new QLCDNumber(2);
levelLcd->setSegmentStyle(QLCDNumber::Filled);
linesLcd = new QLCDNumber(5);
linesLcd->setSegmentStyle(QLCDNumber::Filled);

startButton = new QPushButton(tr("&Start"));
startButton->setFocusPolicy(Qt::NoFocus);
quitButton = new QPushButton(tr("&Quit"));
quitButton->setFocusPolicy(Qt::NoFocus);
pauseButton = new QPushButton(tr("&Pause"));

pauseButton->setFocusPolicy(Qt::NoFocus);

connect(startButton, SIGNAL(clicked()), board, SLOT(start()));

connect(quitButton , SIGNAL(clicked()), qApp, SLOT(quit()));
connect(pauseButton, SIGNAL(clicked()), board, SLOT(pause()));
connect(board, SIGNAL(scoreChanged(int)), scoreLcd, SLOT(display(int)));
connect(board, SIGNAL(levelChanged(int)), levelLcd, SLOT(display(int)));
connect(board, SIGNAL(linesRemovedChanged(int)),
linesLcd, SLOT(display(int)));

QGridLayout *layout = new QGridLayout;
layout->addWidget(createLabel(tr("NEXT")), 0, 0);
layout->addWidget(nextPieceLabel, 1, 0);
layout->addWidget(createLabel(tr("LEVEL")), 2, 0);
layout->addWidget(levelLcd, 3, 0);
layout->addWidget(startButton, 4, 0);
layout->addWidget(board, 0, 1, 6, 1);
layout->addWidget(createLabel(tr("SCORE")), 0, 2);
layout->addWidget(scoreLcd, 1, 2);
layout->addWidget(createLabel(tr("LINES REMOVED")), 2, 2);
layout->addWidget(linesLcd, 3, 2);
layout->addWidget(quitButton, 4, 2);
layout->addWidget(pauseButton, 5, 2);
setLayout(layout);
setWindowTitle(tr("Tetrix"));
resize(550, 370);
}

QLabel *TetrixWindow::createLabel(const QString &text)
{
QLabel *lbl = new QLabel(text);
lbl->setAlignment(Qt::AlignHCenter | Qt::AlignBottom);
return lbl;
}

#include <QtGui>
#include <stdlib.h>
#include "tetrixwindow.h"
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
TetrixWindow window;
window.show();
qsrand(QTime(0,0,0).secsTo(QTime::currentTime()));
return app.exec();
}

</source>

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