QT 簡單編寫貪吃蛇

大體思路

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用畫矩形的方式，循環繪製網格。

    //畫遊戲盤
    QPainter painter(this);
    for(int x = 0; x < COL; ++x) {
      for(int y = 0; y < ROW; ++y) {
          painter.drawRect(QRect(x*RectWidth, y*RectHeight, RectHeight, RectHeight));
      }
    }

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通過紅色小正方形表示蛇頭， 黑色表示蛇身， 綠色表示食物

    //畫食物
    painter.fillRect(QRect(foodPosition[0]*RectWidth, foodPosition[1]*RectHeight, RectHeight, RectHeight), Qt::green);

    //畫蛇頭
    painter.fillRect(QRect(snake[0][0]*RectWidth, snake[0][1]*RectHeight, RectHeight, RectHeight), Qt::red);

    //畫蛇身
    for(int snakeBoy = 1; snakeBoy <= m_foodCount; ++snakeBoy) {
        painter.fillRect(QRect(snake[snakeBoy][0]*RectWidth, snake[snakeBoy][1]*RectHeight, RectHeight, RectHeight), Qt::black);
    }

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通過二維數組表示對應的蛇頭，蛇身對應的x,y座標

int snake[100][2]; //保存蛇每個結點座標

這裏定義的蛇總長方格不超過100， 當然可以增加， 2表示x 和y ,snake[0][0] 表示蛇頭x座標， snake[0][1]表示蛇頭y座標。 相應的蛇身用snake[k][0] 表示x, snake[k][1]爲y , k在1到99之間。

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蛇的移動，主要是吃食後的移動。

即爲蛇頭向前移動一格後，蛇頭座標變了，原蛇頭的座標爲第一節身體的座標， 原第一節身體座標爲現在第二節的座標，即所有座標向前移動一格

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部分代碼展示

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主要遊戲相關文件

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由於用的mark寫的所以有“#”的地方作了一下處理。
.h文件

"ifndef WIDGET_H
"define WIDGET_H

"include <QWidget>

namespace Ui {
class Widget;
}

class Widget : public QWidget
{
    Q_OBJECT

public:
    explicit Widget(QWidget *parent = 0);
    ~Widget();

protected:
    virtual void paintEvent(QPaintEvent* event);
    virtual void resizeEvent(QResizeEvent* event);


private:
    bool checkEatFood();
    void creatFood();
    bool dealGuoJie();
    void drawSnakeHead();
    void flashScore();
    void gameOver();
    void init();
    void initData();
    void initAndiroStyle();
    void initBackground();
    void initConnect();
    void initWindows();
    void snakeHeadRun();
    void snakeRun();
    void upgrade();

private slots:
    void slotTimeOut();

    void on_upButton_clicked();

    void on_leftButton_clicked();

    void on_downButton_clicked();

    void on_rightButton_clicked();

    void on_returnButton_clicked();

private:
    Ui::Widget *ui;
    QTimer *m_timer;
    int snake[100][2]; //保存蛇每個結點座標
    int *snakeBody[100][2];
    int m_direction;
    int foodPosition[2];
    int m_foodCount;
    int m_currentGrade;
    int m_upgradeScore;
    int m_currentSpeed;
};

#endif // WIDGET_H

.cpp 文件

include "widget.h"
include "ui_widget.h"
include "QKeyEvent>
include "QPainter>
include "QTimer>
include "QDebug>
include "QMessageBox>
include "QEvent>
include "QMenu>
include "QContextMenuEvent>
include "QApplication>
include "QScreen>
include "QDesktopWidget>

ifndef COL
define COL 30
endif

ifndef ROW
define ROW 22
endif

ifndef RectWidth
define RectWidth 45
endif

ifndef RectHeight
define RectHeight 45
endif

define UP 0
define DOWN 1
define LEFT 2
define RIGHT 3

Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget),
    m_timer(new QTimer(this)),
    m_direction(0),
    m_foodCount(0),
    m_currentGrade(1),
    m_upgradeScore(100),
    m_currentSpeed(500)
{
    ui->setupUi(this);
    init();
}

Widget::~Widget()
{
    delete ui;
}

void Widget::paintEvent(QPaintEvent* event)
{
    //畫遊戲盤
    QPainter painter(this);
    for(int x = 0; x < COL; ++x) {
      for(int y = 0; y < ROW; ++y) {
          painter.drawRect(QRect(x*RectWidth, y*RectHeight, RectHeight, RectHeight));
      }
    }

    //畫食物
    painter.fillRect(QRect(foodPosition[0]*RectWidth, foodPosition[1]*RectHeight, RectHeight, RectHeight), Qt::green);

    //畫蛇頭
    painter.fillRect(QRect(snake[0][0]*RectWidth, snake[0][1]*RectHeight, RectHeight, RectHeight), Qt::red);

    //畫蛇身
    for(int snakeBoy = 1; snakeBoy <= m_foodCount; ++snakeBoy) {
        painter.fillRect(QRect(snake[snakeBoy][0]*RectWidth, snake[snakeBoy][1]*RectHeight, RectHeight, RectHeight), Qt::black);
    }

}

void Widget::resizeEvent(QResizeEvent* event)
{
    initBackground();
    QSize size = qApp->desktop( )->screenGeometry( ).size( );
    resize(size);
}

bool Widget::checkEatFood()
{
    //如果蛇頭的X座標等於食物的X座標，並且蛇頭的Y座標等於食物的Y座標 表示吃到食物，否則表示沒有吃到。
    if(snake[0][0] == foodPosition[0] && snake[0][1] == foodPosition[1]){
        ++ m_foodCount;
        upgrade();
        flashScore();
        creatFood(); //產生一個新的食物
    }

    //蛇的身子添加
    for(int snId = m_foodCount; snId > 0; --snId){
       snake[snId][0] = snake[snId - 1][0];
       snake[snId][1] = snake[snId - 1][1];
    }

    snakeHeadRun();
}

void Widget::creatFood()
{
    foodPosition[0] = qrand() % COL;
    foodPosition[1] = qrand() % ROW;

    //防止產生的食物在蛇的身上
    for(int bodyId = 0; bodyId <= m_foodCount; ++ bodyId) {
        if(foodPosition[0] == snake[bodyId][0] && foodPosition[1] == snake[bodyId][1]) {
            foodPosition[0] = qrand() % COL - 1;
            foodPosition[1] = qrand() % ROW - 1;
        }
    }
}

bool Widget::dealGuoJie()
{
    if(snake[0][0] > (COL - 1) || snake[0][0] < 0 || snake[0][1] > (ROW - 1) || snake[0][1] < 0) {
        gameOver();
        return true;
    }

    for(int i = 1; i <= m_foodCount; ++i) {
        if(snake[0][0] == snake[i][0] && snake[0][1] == snake[i][1]) {
            gameOver();
            return true;
        }
    }

    return false;
}

void Widget::drawSnakeHead()
{
    //畫蛇頭
    snake[0][0] = qrand() % COL;
    snake[0][1] = qrand() % ROW;

    //方向
    m_direction = qrand() % 4;
}

void Widget::flashScore()
{
    ui->levelEdit->setText(QString::number(m_currentGrade));
    ui->scoreEdit->setText(QString::number(m_foodCount*10));
}

void Widget::gameOver()
{
    m_timer->stop();
    QMessageBox::information(this, QString::fromUtf8("Waring"), QString::fromUtf8("Game Over"));
    ui->levelEdit->setText(QLatin1String("1"));
    ui->scoreEdit->setText(QLatin1String("0"));
}

void Widget::init()
{
    initAndiroStyle();
    drawSnakeHead();
    creatFood();
    initBackground();
    initConnect();
    initWindows();
}

void Widget::initAndiroStyle()
{
    QScreen *screen = qApp->primaryScreen();
    QFont f = qApp->font();
    int pixelSize = (f.pointSize() * screen->logicalDotsPerInch()) / (72*1.5);

    QFont andiroFont;
    andiroFont.setPixelSize(pixelSize);

    ui->upButton->setFont(andiroFont);
    ui->leftButton->setFont(andiroFont);
    ui->downButton->setFont(andiroFont);
    ui->rightButton->setFont(andiroFont);

    ui->label->setFont(andiroFont);
    ui->label_2->setFont(andiroFont);

    ui->scoreEdit->setFont(andiroFont);
    ui->levelEdit->setFont(andiroFont);
}

void Widget::initBackground()
{
    setAutoFillBackground(true);
    QPalette palette;
    palette.setBrush(QPalette::Background, QBrush(QPixmap(":/images/background.png").scaled(this->size())));
    setPalette(palette);

    ui->returnButton->setIcon(QIcon(":/images/return_normal.png"));
    ui->returnButton->setIconSize(QSize(100, 60));
    ui->returnButton->setFlat(true);
}

void Widget::initConnect()
{
    connect(m_timer, SIGNAL(timeout()), this, SLOT(slotTimeOut()));
    m_timer->start(m_currentSpeed);
}

void Widget::initData()
{
    ui->levelEdit->setText(QLatin1String("1"));
    ui->scoreEdit->setText(QLatin1String("0"));

    m_direction = 0;
    m_foodCount = 0;
    m_currentGrade = 1;
    m_upgradeScore = 100;
    m_currentSpeed = 500;
}

void Widget::initWindows()
{
    setWindowTitle("貪吃蛇");
    setWindowIcon(QIcon(":/images/ico.png"));
}

void Widget::snakeHeadRun()
{
    //蛇根據方向遊動
    switch(m_direction){
    case UP:
        -- snake[0][1];
        break;

    case DOWN:
        ++ snake[0][1];
        break;

    case LEFT:
        -- snake[0][0];
        break;

    case RIGHT:
        ++ snake[0][0];
        break;

    default:
        break;
    }
}

void Widget::snakeRun()
{
    //蛇根據方向遊動
    if(dealGuoJie())
        return;
    checkEatFood();
    update();
}

void Widget::upgrade()
{
    qDebug() << "the ui->scoreEdit->text().toInt() is:" << ui->scoreEdit->text().toInt()
                << "m_upgradeScore * m_currentGrade" << m_upgradeScore * m_currentGrade << m_upgradeScore << m_currentGrade;
    if(ui->scoreEdit->text().toInt() >=  m_upgradeScore * m_currentGrade) {
        m_upgradeScore *= 2;
        ++ m_currentGrade;
        if(m_currentSpeed > 50){
            m_currentSpeed -= 10;
        }
        m_timer->stop();
        QMessageBox::information(this, QString::fromUtf8("Waring"), QString::fromUtf8("Upgrade success"));
        m_timer->start(m_currentSpeed);
    }
}

void Widget::slotTimeOut()
{
   snakeRun();
}

void Widget::on_upButton_clicked()
{
    m_direction = UP;
}

void Widget::on_leftButton_clicked()
{
    m_direction = LEFT;
}

void Widget::on_downButton_clicked()
{
    m_direction = DOWN;
}

void Widget::on_rightButton_clicked()
{
    m_direction = RIGHT;
}

void Widget::on_returnButton_clicked()
{
    initData();
    close();
}

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進行選擇文件代碼

.h

"ifndef MENUEWIDGET_H
"define MENUEWIDGET_H

"include <QWidget>

namespace Ui {
class MenueWidget;
}

class MenueWidget : public QWidget
{
    Q_OBJECT

public:
    explicit MenueWidget(QWidget *parent = 0);
    ~MenueWidget();

protected:
    virtual void paintEvent(QPaintEvent* event);

private slots:
    void on_startButton_clicked();

    void on_leaveButton_clicked();

private:
    void init();
    void initBackground();
    void initWindows();

private:
    Ui::MenueWidget *ui;
};

#endif // MENUEWIDGET_H

.cpp

#include "menuewidget.h"
#include "ui_menuewidget.h"
#include "widget.h"

MenueWidget::MenueWidget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::MenueWidget)
{
    ui->setupUi(this);
    init();
}

MenueWidget::~MenueWidget()
{
    delete ui;
}

void MenueWidget::paintEvent(QPaintEvent* event)
{
    initBackground();
}

void MenueWidget::on_startButton_clicked()
{
    Widget *myWidget = new Widget(this);
   // myWidget->setWindowFlags(Qt::WindowMinMaxButtonsHint&Qt::WindowCloseButtonHint);
   // myWidget->showFullScreen();
    myWidget->show();
}

void MenueWidget::on_leaveButton_clicked()
{
    exit(0);
}

void MenueWidget::init()
{
    initBackground();
    initWindows();
}

void MenueWidget::initBackground()
{
    setAutoFillBackground(true);
    QPalette palette;
    palette.setBrush(QPalette::Background, QBrush(QPixmap(":/images/main_home_background.png").scaled(this->size())));
    setPalette(palette);

    ui->startButton->setIcon(QIcon(":/images/start_normal.png"));
    ui->startButton->setIconSize(QSize(240, 240));
    ui->startButton->setFlat(true);

    ui->leaveButton->setIcon(QIcon(":/images/quit_normal.png"));
    ui->leaveButton->setIconSize(QSize(270, 270));
    ui->leaveButton->setFlat(true);

}

void MenueWidget::initWindows()
{
    setWindowTitle("貪吃蛇");
    setWindowIcon(QIcon(":/images/ico.png"));
}

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對應效果圖

pc版

1.操作界面效果圖

2.運行時效果圖

3.撞到邊界效果圖

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安卓手機版

1.手機版操作界面

2.手機版遊戲界面

3.手機版邊界處理