QT 简单编写贪吃蛇思路分析

大体思路 用画矩形的方式循环绘制网格 通过红色小正方形表示蛇头 黑色表示蛇身 绿色表示食物 通过二维数组表示对应的蛇头蛇身对应的xy坐标 蛇的移动主要是吃食后的移动 即为蛇头向前移动一格后蛇头坐标变了原蛇头的坐标为第一节身体的坐标 原第一节身体坐标为现在第二节的坐标即所有坐标向前移动一格 部分代码展示 主要游戏相关文件 进行选择文件代码 对应效果图 pc版 安卓手机版

 
 

 

大体思路

用画矩形的方式，循环绘制网格。

    //画游戏盘
    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));
      }
    }

通过红色小正方形表示蛇头， 黑色表示蛇身， 绿色表示食物

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

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

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

通过二维数组表示对应的蛇头，蛇身对应的x,y坐标

int snake[100][2]; //保存蛇每个结点坐标

这里定义的蛇总长方格不超过100， 当然可以增加， 2表示x 和y ,snake[0][0] 表示蛇头x坐标， snake[0][1]表示蛇头y坐标。 相应的蛇身用snake[k][0] 表示x, snake[k][1]为y , k在1到99之间。

蛇的移动，主要是吃食后的移动。 即为蛇头向前移动一格后，蛇头坐标变了，原蛇头的坐标为第一节身体的坐标， 原第一节身体坐标为现在第二节的坐标，即所有坐标向前移动一格

部分代码展示

主要游戏相关文件

由于用的mark写的所以有“#”的地方作了一下处理。
.h文件

"ifndef WIDGET_H
"define WIDGET_H

"include 

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]; //保存蛇每个结点坐标
    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)
{
//画游戏盘
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));
}
}

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

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

//画蛇身
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()
{
//如果蛇头的X坐标等于食物的X坐标，并且蛇头的Y坐标等于食物的Y坐标 表示吃到食物，否则表示没有吃到。
if(snake[0][0] == foodPosition[0] && snake[0][1] == foodPosition[1]){
++ m_foodCount;
upgrade();
flashScore();
creatFood(); //产生一个新的食物
}

//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;

//防止产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()
{
//画蛇头
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(“贪吃蛇”);
setWindowIcon(QIcon(“:/images/ico.png”));
}

void Widget::snakeHeadRun()
{
//蛇根据方向游动
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()
{
//蛇根据方向游动
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();
}

进行选择文件代码

.h

"ifndef MENUEWIDGET_H
"define MENUEWIDGET_H

"include 

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("贪吃蛇");
    setWindowIcon(QIcon(":/images/ico.png"));
}

对应效果图

pc版

1.操作界面效果图
这里写图片描述
2.运行时效果图
这里写图片描述
3.撞到边界效果图
这里写图片描述

安卓手机版

1.手机版操作界面
这里写图片描述

2.手机版游戏界面
这里写图片描述

这里写图片描述
3.手机版边界处理
这里写图片描述

 
 

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