Qt5 图形视图框架QGraphicsView

1、图形视图框架包含三大类：场景类（QGraphicsScene），视图类(QGraphicsView)，图元类(QGraphicsItem)；
2、对于有很多项的场景，使用轻量级的QGraphicsItem类作为数目众多的自定义项的基础最好，仅对数目较少的项使用QGraphicsObject
3、当一个项发生了变换（transformation），该项所有的子对象自动应用该变换，递归应用到最深层次的子孙对象，
变换有（拖动，移动。。。。。），通过调用QGraphicsItem：：setFlag（QGraphicsItem：：ItemIngnoreTransformation）可以使子项忽略父项的变换，通常使用的标志还有可移动，选中，获得焦点等
4、通过把项设置为QGraphicsItemGroup的子项，可以将他们分组，创建项的集合。
5、图形视图类使用三种坐标系统，但是实际应用中只是关心其中的两种。视图使用物理坐标系统，场景使用在构造函数中传入的QRectF定义的逻辑坐标系统。Qt自动进行场景坐标到视图坐标的映射，放置项时使用的是场景的坐标。项的中心是在（0,0）点的逻辑坐标系统，每个项的（0,0）点实际在该项场景中所在位置的中心（文本项除外，原点在项的左上角）。
6、图形项：QGraphicsItem因为有两个纯虚函数而不能实例化对象，这两个纯虚函数是boundingRect（）和paint（）
paint（）函数必须重新实现来绘制项，boundingRect（）函数在图形视图框架中为项提供一个边界矩形，用于冲突监测和保证项仅在QGraphicsView的视口（viewport）中可见时才重绘。如果要创建非矩形形状的自定义图形项，最好同时实现shape（）方法，这个方法返回一个精确描述项的轮廓的QpainterPath，对于准确检测冲突和鼠标点击非常有用。
7、如果要自定义一个形状，最简单的是使用标准的QGraphicsItem的子类之一，比如QGraphicsPathItem和QGraphicsPolygonItem，如果有定制行为，可以重新实现保护事件的处理函数，如keyPressEvent（）。如果只是想要自己绘制，可以从QGraphicsItem派生，重新实现boundingRect（）和paint（）和shape（）方法。

俄罗斯方块的实现

俄罗斯方块的逻辑

小方块的类型

效果图

代码的实现

onePiece.h

#ifndef ONEPIECE_H

#define ONEPIECE_H

/************

 *一块方块的绘制

 *

 *

 ***************/

#include <QGraphicsObject>

#include <QColor>

class onePiece : public QGraphicsObject

{

public:

    onePiece(const QColor &brushColor = Qt::red);

    //为项提供一个外围的边界矩形

    virtual QRectF boundingRect() const;

    //QGraphicsView调用，在本地坐标系统中绘制项

    virtual void paint(QPainter * painter, const QStyleOptionGraphicsItem * option, QWidget * widget = 0);

    //重新定义项的形状，默认调用boundingRect获取项的矩形形状轮廓

    virtual QPainterPath shape() const;

private:

    QColor m_brushColor;

};

#endif // ONEPIECE_H

onepiece.c

#include "onepiece.h"

#include <QPainter>

#include "enumHeader.h"

/****

 * 为了避免同一个方块组内小方块发生碰撞，

 * 小方块的大小实际为19.5*19.5，但是小方块加上笔刷的宽度后为20*20

 * 这样看起来是四个小方块连在一起的

 * **/

onePiece::onePiece(const QColor &brushColor)

    :m_brushColor(brushColor)

{

}

QRectF onePiece::boundingRect() const

{

    qreal penWidth = PEN_WIDTH;

    return QRectF(-(PIECE_DIAMETER - penWidth)/2, -(PIECE_DIAMETER - penWidth)/2,

                  PIECE_DIAMETER - penWidth, PIECE_DIAMETER - penWidth);

}

void onePiece::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)

{

    //背景贴图

    painter->drawPixmap(-PIECE_DIAMETER/2,-PIECE_DIAMETER/2,PIECE_DIAMETER,PIECE_DIAMETER,QPixmap(":/piece/Image/piece/box.png"));

    painter->setBrush(m_brushColor);

    //将方块的边界的颜色进行透明化

    QColor penColor = m_brushColor;

    // 将颜色的透明度减小

    penColor.setAlpha(200);

    painter->setPen(penColor);

    //使用当前的笔刷和笔画矩形框

    painter->drawRect(-PIECE_DIAMETER/2, -PIECE_DIAMETER/2, PIECE_DIAMETER, PIECE_DIAMETER);

}

QPainterPath onePiece::shape() const

{

    QPainterPath path;

    //去除笔刷的宽度，这样同一个方块组的方块就不会被检测出碰撞的情况

    path.addRect(-(PIECE_DIAMETER-PEN_WIDTH)/2,-(PIECE_DIAMETER-PEN_WIDTH)/2,PIECE_DIAMETER-PEN_WIDTH,PIECE_DIAMETER-PEN_WIDTH);

    return path;

}

pieceBox.h

#ifndef PIECEBOX_H

#define PIECEBOX_H

/********

 * 方块组

 * 4*4

 *

 *

 * ******/

#include <QGraphicsItemGroup>

#include <QKeyEvent>

#include <QTimer>

#include "enumHeader.h"

#include <QTransform>

#include "onepiece.h"

#include <QGraphicsItem>

class pieceBox :public QObject,public QGraphicsItemGroup

{

    Q_OBJECT

public:

    pieceBox();

    //颜色表

    static QColor colorTable[7];

    //绘制方块组的边框矩形

    virtual QRectF boundingRect() const;

    //是否发生碰撞

    bool isCollding() const;

    //获取当前的方块类型

    BoxType getCurrentBoxType() const;

    //创建方块组

    void createBox(const QPointF &point = QPointF(0,0),

                   BoxType currentBoxType = RandomShape);

    //消除方块组

    void clearBoxGroup(const bool &isClear = false);

protected:

    virtual void keyPressEvent(QKeyEvent * event);

signals:

    void signal_needNewBox();

    void signal_gameOver();

public slots:

    void slot_moveOneStep();

    void slot_startTimer(int timeSec);

    void slot_stopTimer();

private:

    QTimer *m_Timer;

    BoxType m_currentBoxType;

    QTransform m_oldTransform;

    QList<onePiece *> m_pieceBoxList;   //存放新方块组的四个方块

};

#endif // PIECEBOX_H

pieceBox.c

#include "piecebox.h"

#include "enumHeader.h"

#include <QList>

#include <QDebug>

QColor pieceBox::colorTable[7] = {QColor(200,0,0,100),QColor(255,200,0,100),

                                 QColor(0,0,200,100),QColor(0,200,0,100),

                                 QColor(0,200,255,100),QColor(200,0,255,100),

                                 QColor(150,100,100,100)};

pieceBox::pieceBox()

{

    m_pieceBoxList.clear();

    //使得方块组支持键盘操作

    setFlags(QGraphicsItem::ItemIsFocusable);

    //保存矩阵的原状态，使得可以还原矩阵

    m_oldTransform = transform();

    m_Timer = new QTimer(this);

    connect(m_Timer,SIGNAL(timeout()),this,SLOT(slot_moveOneStep()));

    m_currentBoxType = RandomShape;

}

//绘制方块组的边框矩形

QRectF pieceBox::boundingRect() const

{

    qreal penWidth = PEN_WIDTH;

    return QRectF(-(PIECE_DIAMETER*2 - penWidth) / 2, -(PIECE_DIAMETER*2 - penWidth) / 2,

                  PIECE_DIAMETER*4-penWidth, PIECE_DIAMETER*4-penWidth);

}

bool pieceBox::isCollding() const

{

    //依次检测方块组中的每个方块的碰撞

    foreach (onePiece *piece, m_pieceBoxList) {

//        qDebug() << "colliding number:" << piece->collidingItems().count();

        //获取与该方块碰撞的方块的个数

        if(piece->collidingItems().count() > 1)

        {

            return true;

        }

    }

    return false;

}

BoxType pieceBox::getCurrentBoxType() const

{

    return m_currentBoxType;

}

void pieceBox::createBox(const QPointF &point, BoxType currentBoxType)

{

    int boxType = currentBoxType;

    if(boxType == RandomShape)

    {

        boxType = qrand() % 7;

    }

    //设置该方块组的颜色

    QColor boxColor = colorTable[boxType];

    //准备四个小方块

    //恢复方块组的变换矩阵，因为之前的方块组的变换会导致变换矩阵的位置发生变换,

    //防止新的方块组因为旧的方块组变换异常

    setTransform(m_oldTransform);

    setRotation(0);

    resetTransform();

    m_pieceBoxList.clear();

    for(int i = 0;i < 4;i++)

    {

        onePiece *piece = new onePiece(boxColor);

        m_pieceBoxList.append(piece);

        //将小方块添加到方块组中

        addToGroup(piece);

    }

    //设置方块组的形状

    switch (boxType) {

    case IShape:

        m_currentBoxType = IShape;

        m_pieceBoxList.at(0)->setPos(-30,-10);

        m_pieceBoxList.at(1)->setPos(-10,-10);

        m_pieceBoxList.at(2)->setPos(10,-10);

        m_pieceBoxList.at(3)->setPos(30,-10);

        break;

    case JShape:

        m_currentBoxType = JShape;

        m_pieceBoxList.at(0)->setPos(10,-10);

        m_pieceBoxList.at(1)->setPos(10,10);

        m_pieceBoxList.at(2)->setPos(10,30);

        m_pieceBoxList.at(3)->setPos(-10,30);

        break;

    case LShape:

        m_currentBoxType = LShape;

        m_pieceBoxList.at(0)->setPos(-10,-10);

        m_pieceBoxList.at(1)->setPos(-10,10);

        m_pieceBoxList.at(2)->setPos(10,30);

        m_pieceBoxList.at(3)->setPos(-10,30);

        break;

    case OShape:

        m_currentBoxType = OShape;

         m_pieceBoxList.at(0)->setPos(-10,-10);

         m_pieceBoxList.at(1)->setPos(10,-10);

         m_pieceBoxList.at(2)->setPos(-10,10);

         m_pieceBoxList.at(3)->setPos(10,10);

        break;

    case SShape:

        m_currentBoxType = SShape;

         m_pieceBoxList.at(0)->setPos(30,-10);

         m_pieceBoxList.at(1)->setPos(10,-10);

         m_pieceBoxList.at(2)->setPos(10,10);

         m_pieceBoxList.at(3)->setPos(-10,10);

        break;

    case TShape:

        m_currentBoxType = TShape;

         m_pieceBoxList.at(0)->setPos(-10,-10);

         m_pieceBoxList.at(1)->setPos(10,-10);

         m_pieceBoxList.at(2)->setPos(30,-10);

         m_pieceBoxList.at(3)->setPos(10,10);

        break;

    case Zshape:

        m_currentBoxType = Zshape;

         m_pieceBoxList.at(0)->setPos(-10,-10);

         m_pieceBoxList.at(1)->setPos(10,-10);

         m_pieceBoxList.at(2)->setPos(10,10);

         m_pieceBoxList.at(3)->setPos(30,10);

        break;

    default:

        break;

    }

    //设置方块组的位置

    setPos(point);

    //检测是否发生碰撞,发生碰撞，游戏结束

    if(isCollding())

    {

        slot_stopTimer();

        emit signal_gameOver();

    }

}

//删除方块组中的小方块到情景中

void pieceBox::clearBoxGroup(const bool &isClear)

{

    QList<QGraphicsItem *> itemList = childItems();

    foreach (QGraphicsItem *piece, itemList) {

        removeFromGroup(piece);

//        qDebug() << "clear box group" << isClear;

        if(isClear)

        {

            //销毁小方块

           ((onePiece *)piece)->deleteLater();

        }

    }

    m_pieceBoxList.clear();

}

void pieceBox::keyPressEvent(QKeyEvent *event)

{

    switch (event->key()) {

    case Qt::Key_Down:

        moveBy(0,20);

        //检测是否碰撞

        if(isCollding())

        {

           moveBy(0,-20);

           clearBoxGroup();

           //需要新的方块

           emit signal_needNewBox();

        }

        break;

    case Qt::Key_Left:

        moveBy(-20,0);

        if(isCollding())

        {

            moveBy(20,0);

        }

        break;

    case Qt::Key_Right:

        moveBy(20,0);

        if(isCollding())

        {

            moveBy(-20,0);

        }

        break;

    case Qt::Key_Up:

        setRotation(rotation()+90);

        if(isCollding())

        {

            setRotation(rotation()-90);

        }

        break;

    case Qt::Key_Space: //快速下落

        moveBy(0,20);

        while (!isCollding()) {

            moveBy(0,20);

        }

        moveBy(0,-20);

        clearBoxGroup();

        //需要新的方块

        emit signal_needNewBox();

        break;

    default:

        break;

    }

}

void pieceBox::slot_moveOneStep()

{

    moveBy(0,20);

//    qDebug() << "move one step";

    if(isCollding())

    {

        moveBy(0,-20);

        // 将小方块从方块组中移除到场景中

        clearBoxGroup();

        //需要新的方块

        emit signal_needNewBox();

    }

}

void pieceBox::slot_startTimer(int timeSec)

{

    m_Timer->start(timeSec);

}

void pieceBox::slot_stopTimer()

{

    m_Timer->stop();

}

**界面类**panel.h

#ifndef PANEL_H

#define PANEL_H

#include <QWidget>

#include <QPalette>

#include <QPixmap>

#include <QGraphicsScene>

#include <QGraphicsView>

#include "piecebox.h"

#include "onepiece.h"

#include <QGraphicsLineItem>

#include <QMediaPlayer>

namespace Ui {

class Panel;

}

class Panel : public QWidget

{

    Q_OBJECT

public:

    explicit Panel(QWidget *parent = 0);

    ~Panel();

    void setbackground(const int &Lv);

    void initControlWidget();

    void initGraphicsViewWidget();

    /**游戏控制项***/

    void startGame();

    void pauseGame();

    void restartGame();

    void stopGame();

    void updateScore(const int fullRows = 0);

private slots:

    void on_pbt_startGame_clicked();

    void on_pbt_pauseGame_clicked();

    void on_pbt_restart_clicked();

    void on_pbt_stopGame_clicked();

    void slot_clearFullRows();

    void slot_gameOver();

    void slot_moveBox();

private:

    Ui::Panel *ui;

    QPalette m_Palette;

    QPixmap m_pixmap;

    int m_currentLv;

    int m_currentLVSpeed;

    bool m_isPauseGame;

    bool m_isGameOver;

    QGraphicsScene *m_scene;

    //四条边界线

    QGraphicsLineItem *m_topLine;

    QGraphicsLineItem *m_leftLine;

    QGraphicsLineItem *m_buttomLine;

    QGraphicsLineItem *m_rightLine;

    pieceBox *m_currentBox;

    pieceBox *m_nextBox;

    QList<int> m_rowList;

    QMediaPlayer *m_mediaPlayer;

};

#endif // PANEL_H

panel.c

#include "panel.h"

#include "ui_panel.h"

#include "enumHeader.h"

#include <QDebug>

#include <QGraphicsBlurEffect>

#include <QPropertyAnimation>

#include <QMessageBox>

#include <QMediaContent>

Panel::Panel(QWidget *parent) :

    QWidget(parent),

    ui(new Ui::Panel)

{

    ui->setupUi(this);

    m_isPauseGame = false;

    m_isGameOver = false;

    m_mediaPlayer = new QMediaPlayer;

    m_mediaPlayer->setMedia(QUrl::fromLocalFile(QString("clearRow.mp3")));

    m_mediaPlayer->setVolume(100);

    //设置背景

    setbackground(LV0);

    initControlWidget();

    initGraphicsViewWidget();

}

Panel::~Panel()

{

    delete ui;

}

void Panel::setbackground(const int &Lv)

{

    setAutoFillBackground(true);

    switch (Lv) {

    case LV0:

        m_currentLv = LV0;

        m_currentLVSpeed = LV0_SPEED;

        ui->label_gameLevel->setText("俄罗斯方块");

        m_pixmap.load(":/background/Image/background/background.png");

        break;

    case LV1:

        m_currentLv = LV1;

        m_currentLVSpeed = LV1_SPEED;

        ui->label_gameLevel->setText("第一关");

        m_pixmap.load(":/background/Image/background/background01.png");

        break;

    case LV2:

        m_currentLv = LV2;

        m_currentLVSpeed = LV2_SPEED;

        ui->label_gameLevel->setText("第二关");

        m_pixmap.load(":/background/Image/background/background02.png");

        break;

    case LV3:

        m_currentLv = LV3;

        m_currentLVSpeed = LV3_SPEED;

        ui->label_gameLevel->setText("第三关");

        m_pixmap.load(":/background/Image/background/background03.png");

        break;

    case LV4:

        m_currentLv = LV4;

        m_currentLVSpeed = LV4_SPEED;

        ui->label_gameLevel->setText("第四关");

        m_pixmap.load(":/background/Image/background/background04.png");

        break;

    case LV5:

        m_currentLv = LV5;

        m_currentLVSpeed = LV5_SPEED;

        ui->label_gameLevel->setText("第五关");

        m_pixmap.load(":/background/Image/background/background05.png");

        break;

    default:

        break;

    }

    m_Palette.setBrush(QPalette::Window, QBrush(m_pixmap.scaled(size(), Qt::IgnoreAspectRatio, Qt::SmoothTransformation)));

    setPalette(m_Palette);

}

void Panel::initControlWidget()

{

    switch (m_currentLv) {

    case LV0:

        ui->pbt_startGame->setEnabled(true);

        ui->pbt_pauseGame->setEnabled(false);

        ui->pbt_restart->setEnabled(false);

        ui->pbt_stopGame->setEnabled(false);

        break;

    case LV1:

    case LV2:

    case LV3:

    case LV4:

    case LV5:

        ui->pbt_startGame->setEnabled(false);

        ui->pbt_pauseGame->setEnabled(true);

        ui->pbt_restart->setEnabled(true);

        ui->pbt_stopGame->setEnabled(true);

        break;

    default:

        break;

    }

}

void Panel::initGraphicsViewWidget()

{

    //使用抗锯齿渲染

    ui->GraphicsView->setRenderHint(QPainter::Antialiasing);

    //设置缓冲背景，加速渲染

    ui->GraphicsView->setCacheMode(QGraphicsView::CacheBackground);

    m_scene = new QGraphicsScene(this);

    m_scene->setSceneRect(30,30,310,410);

    ui->GraphicsView->setScene(m_scene);

    //方块可移动的四条线

    //向外扩展3像素，这样可以使方块组到达边界的时候再移动就会发生碰撞

    m_topLine = m_scene->addLine(32,32,238,32);

    m_leftLine = m_scene->addLine(32,32,32,438);

    m_buttomLine = m_scene->addLine(32,438,238,438);

    m_rightLine = m_scene->addLine(238,32,238,438);

    m_topLine->setPen(QPen(QColor(255,255,255)));

    m_leftLine->setPen(QPen(QColor(255,255,255)));

    m_buttomLine->setPen(QPen(QColor(255,255,255)));

    m_rightLine->setPen(QPen(QColor(255,255,255)));

    m_currentBox = new pieceBox;

    m_nextBox = new pieceBox;

    connect(m_currentBox,SIGNAL(signal_needNewBox()),this,SLOT(slot_clearFullRows()));

    connect(m_currentBox,SIGNAL(signal_gameOver()),this,SLOT(slot_gameOver()));

    m_scene->addItem(m_currentBox);

    m_scene->addItem(m_nextBox);

}

void Panel::startGame()

{

    m_currentBox->createBox(QPointF(135,55));

    m_nextBox->createBox(QPointF(290,55));

    //将键盘焦点给当前的方块组

    m_currentBox->setFocus();

    m_currentBox->slot_startTimer(m_currentLVSpeed);

}

void Panel::updateScore(const int fullRows)

{

    int score = ui->LCDNum_Score->value() + fullRows*ROWSCORE;

    ui->LCDNum_Score->display(score);

    if(score < 1000)         //第一关

    {

    }else if(score < 2000)  //第二关

    {

        setbackground(LV2);

        initControlWidget();

        m_currentBox->slot_stopTimer();

        m_currentBox->slot_startTimer(m_currentLVSpeed);

    }else if(score < 4000)  //第三关

    {

        setbackground(LV3);

        initControlWidget();

        m_currentBox->slot_stopTimer();

        m_currentBox->slot_startTimer(m_currentLVSpeed);

    }else if(score < 8000) //第四关

    {

        setbackground(LV4);

        initControlWidget();

        m_currentBox->slot_stopTimer();

        m_currentBox->slot_startTimer(m_currentLVSpeed);

    }else if(score < 16000)  //第五关

    {

        setbackground(LV5);

        initControlWidget();

        m_currentBox->slot_stopTimer();

        m_currentBox->slot_startTimer(m_currentLVSpeed);

    }else   //从第一关重新开始

    {

        setbackground(LV1);

        initControlWidget();

        m_currentBox->slot_stopTimer();

        m_currentBox->slot_startTimer(m_currentLVSpeed);

    }

}

/**

 *  开始游戏

 * @brief Panel::on_pbt_startGame_clicked

 */

void Panel::on_pbt_startGame_clicked()

{

    m_isGameOver = false;

    if(m_isPauseGame)

    {

        ui->pbt_startGame->setEnabled(false);

        m_isPauseGame = false;

        m_currentBox->slot_startTimer(m_currentLVSpeed);

        return;

    }

    //默认等级为LV1

    setbackground(LV1);

    initControlWidget();

    startGame();

}

/**

 *  暂停游戏

 * @brief Panel::on_pbt_pauseGame_clicked

 */

void Panel::on_pbt_pauseGame_clicked()

{

    if(m_isPauseGame)

    {

        return;

    }

    m_isPauseGame = true;

    m_currentBox->slot_stopTimer();

    ui->pbt_startGame->setEnabled(true);

    QMessageBox::information(this,"提示","暂停游戏！",QMessageBox::Yes);

}

/**

 * 重新开始游戏

 * @brief Panel::on_pbt_restart_clicked

 */

void Panel::on_pbt_restart_clicked()

{

    m_currentBox->slot_stopTimer();

    m_currentBox->clearBoxGroup();

    m_nextBox->clearBoxGroup(true);

    //先将当前的小正方形组移出游戏框，防止下面的清除item将该方块组清除了

    m_currentBox->setPos(290,55);

    ui->LCDNum_Score->display(0);

    //清空视图中所有的小方块

    foreach (QGraphicsItem *item, m_scene->items(34, 34, 204, 404, Qt::ContainsItemShape,Qt::AscendingOrder)) {

        // 先从场景中移除小方块，因为使用deleteLater()是在返回主事件循环后才销毁

        // 小方块的，为了在出现新的方块组时不发生碰撞，所以需要先从场景中移除小方块

        m_scene->removeItem(item);

        onePiece *piece = (onePiece*) item;

        piece->deleteLater();

    }

    m_isPauseGame = false;

    on_pbt_startGame_clicked();

}

/**

 *  停止游戏

 * @brief Panel::on_pbt_stopGame_clicked

 */

void Panel::on_pbt_stopGame_clicked()

{

    m_currentBox->slot_stopTimer();

    slot_gameOver();

}

/**清除满行的小方块

 * @brief Panel::slot_clearFullRows

 */

void Panel::slot_clearFullRows()

{

    m_rowList.clear();

    //获取比一行方格多行的所有小方块,不包含最高的一行

    for(int i = 414;i > 35; i-=20)

    {

        //返回可视区域(202*22)内所有的完全可视的item

        QList<QGraphicsItem *> itemList = m_scene->items(34,i,204,22,Qt::ContainsItemShape,Qt::AscendingOrder);

//        qDebug() << "可是区域内的item数：" << itemList.count();

        //已满

        if(itemList.count() == 10)

        {

            //遍历列表删除小方块

            foreach (QGraphicsItem *item, itemList) {

                onePiece *piece = (onePiece *)item;

                //模糊效果，先放大再缩小

                QGraphicsBlurEffect *blurEffect = new QGraphicsBlurEffect;

                piece->setGraphicsEffect(blurEffect);

                QPropertyAnimation *animation = new QPropertyAnimation(piece,"scale");

                animation->setDuration(250);

                animation->setEasingCurve(QEasingCurve::OutBounce);

                animation->setStartValue(4);

                animation->setEndValue(0.25);

                animation->start(QAbstractAnimation::DeleteWhenStopped);

                connect(animation,SIGNAL(finished()),piece,SLOT(deleteLater()));

            }

            m_mediaPlayer->play();

            //记录满行的行地址

            m_rowList.append(i);

        }

    }

//    qDebug() << "满行的行数：" << m_rowList.size();

    //存在满行，删除后将上面的方块下移

    if(!m_rowList.isEmpty())

    {

        //等待所有的小正方形都销毁后再将上方的小正方形向下移动

       QTimer::singleShot(300,this,SLOT(slot_moveBox()));

    }else   //直接创建新的方块组

    {

        m_currentBox->createBox(QPointF(135,55), m_nextBox->getCurrentBoxType());

        // 清空并销毁提示方块组中的所有小方块

        m_nextBox->clearBoxGroup(true);

        if(!m_isGameOver)

        {

            m_nextBox->createBox(QPointF(290,55));

        }

    }

}

void Panel::slot_gameOver()

{

//    qDebug() << "game over";

    m_isGameOver = true;

    QMessageBox::information(this,"提示",QString("您的游戏得分为%1!").arg(ui->LCDNum_Score->value()),QMessageBox::Yes);

    ui->LCDNum_Score->display(0);

    m_currentBox->clearFocus();

    setbackground(LV0);

    initControlWidget();

    m_isPauseGame = false;

    //初始化界面

    m_currentBox->clearBoxGroup(true);

    m_nextBox->clearBoxGroup(true);

    //先将当前的小正方形组移出游戏框，防止下面的清除item将该方块组清除了

    m_currentBox->setPos(290,55);

    //清空视图中所有的小方块

    foreach (QGraphicsItem *item, m_scene->items(34, 34, 204, 404, Qt::ContainsItemShape,Qt::AscendingOrder)) {

        // 先从场景中移除小方块，因为使用deleteLater()是在返回主事件循环后才销毁

        // 小方块的，为了在出现新的方块组时不发生碰撞，所以需要先从场景中移除小方块

        m_scene->removeItem(item);

        onePiece *piece = (onePiece*) item;

        piece->deleteLater();

    }

}

/**清空满行的小方块后向下移动上面的小方块

 * @brief Panel::slot_moveBox

 */

void Panel::slot_moveBox()

{

    // 从位置最靠上的满行开始

    for (int i = m_rowList.count(); i > 0; i--)

    {

        foreach (QGraphicsItem *item, m_scene->items(34, 34, 206, m_rowList.at(i-1) - 32, Qt::ContainsItemShape,Qt::AscendingOrder)) {

            item->moveBy(0, 20);

        }

    }

    // 更新分数

    updateScore(m_rowList.count());

    // 将满行列表清空为0

    m_rowList.clear();

    // 等所有行下移以后再出现新的方块组

    m_currentBox->createBox(QPointF(135,55), m_nextBox->getCurrentBoxType());

    // 清空并销毁提示方块组中的所有小方块

    m_nextBox->clearBoxGroup(true);

    m_nextBox->createBox(QPointF(290,55));

}

源码下载
http://download.csdn.net/detail/sxpsxp12/9422207

http://blog.csdn.net/sxpsxp12/article/details/50607224

巴特西

Qt5图形视图框架的“俄罗斯方块”（使用了QGraphicsView）

Qt5 图形视图框架QGraphicsView

俄罗斯方块的实现

俄罗斯方块的逻辑

小方块的类型

效果图

代码的实现

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