一、新建一个Qt项目
新建Qt Widgets Application,项目名称为HappySnake,基类选择QWidget,类名默认
二、添加要用到的头文件
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#include <QKeyEvent> #include <QRectF> #include <QPainter> #include <QPen> #include <QBrush> #include <QDebug> #include <QTimer> #include <QTime> |
三、写类声明信息
- 贪吃蛇的本体使用小方框来代替
- 使用QList类来保存贪吃蛇的本体
- 使用定时器来设定刷新的时间
- 使用随机函数生成奖励的节点
- 使用paintEvent来进行绘图
- keyPressEvent来监测按键的按下,控制贪吃蛇的移动
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class Widget : public QWidget { Q_OBJECT public : explicit Widget(QWidget *parent = 0); ~Widget(); protected : void paintEvent(QPaintEvent *); void keyPressEvent(QKeyEvent *); private : void addTopRectF(); void addDownRectF(); void addLeftRectF(); void addRightRectF(); void deleteLastRectF(); bool snakeStrike(); enum Move{Left,Right,Up,Down}; protected slots: void timeOut(); void rewardTimeOut(); private : Ui::Widget *ui; QList<QRectF> snake; //贪吃蛇本体 int snakeNodeWidth = 10; int snakeNodeHeight = 10; QTimer *timer; QTimer *rewardTimer; int time = 100; int moveFlage = Up; bool gameOver = false ; bool gameStart = false ; QList<QRectF> rewardNode; //奖励节点 }; |
四、对类函数的实现
构造函数
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Widget::Widget(QWidget *parent) : QWidget(parent), ui( new Ui::Widget) { ui->setupUi( this ); resize(480,500); //设置窗体背景色为黑色 setStyleSheet( "QWidget{background:black}" ); setWindowOpacity(0.8); //设置窗口的透明度 snake.append(QRectF(200,500,snakeNodeWidth,snakeNodeHeight)); addTopRectF(); addTopRectF(); //首先生成一个奖励节点 rewardNode.append(QRectF(100,100,snakeNodeWidth,snakeNodeWidth)); timer = new QTimer; connect(timer, SIGNAL(timeout()), this ,SLOT(timeOut())); //timer->start(time); rewardTimer = new QTimer; connect(rewardTimer,SIGNAL(timeout()), this ,SLOT(rewardTimeOut())); //rewardTimer->start(time*30); } Widget::~Widget() { delete ui; } |
界面刷新
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void Widget::timeOut() { int flage = 1; for ( int i=0; i<rewardNode.length(); i++){ if (rewardNode.at(i).contains(snake.at(0).topLeft()+QPointF(snakeNodeWidth/2,snakeNodeHeight/2))){ //if(snake.at(0).contains(rewardNode.at(i).x()+rewardNode.at(i).width()/2,rewardNode.at(i).y()+rewardNode.at(i).height()/2)){ if (rewardNode.at(i).width()>snakeNodeWidth){ //额外奖励 flage += 2; } flage++; //正常奖励 rewardNode.removeAt(i); break ; } } while (flage--){ switch (moveFlage) { case Up: addTopRectF(); break ; case Down: addDownRectF(); break ; case Right: addRightRectF(); break ; case Left: addLeftRectF(); break ; default : break ; } } deleteLastRectF(); update(); } |
随机奖励的生成
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//随机奖励 void Widget::rewardTimeOut() { qsrand(QTime(0,0,0).secsTo(QTime::currentTime())); if (rewardNode.length() > 5){ rewardNode.removeAt(qrand()%5); } rewardNode.append(QRectF(qrand()%( this ->width()/20)*20,qrand()%( this ->height()/20)*20,snakeNodeWidth,snakeNodeWidth)); if (qrand()%5 == 3){ rewardNode.append(QRectF(qrand()%( this ->width()/20)*20-5,qrand()%( this ->height()/20)*20-5,snakeNodeWidth*2,snakeNodeWidth*2)); } } |
移动
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//向上移动 void Widget::addTopRectF() { if (snake.at(0).y()-snakeNodeHeight < 0){ snake.insert(0,QRectF(QPointF(snake.at(0).x(), this ->height()-snakeNodeHeight), QPointF(snake.at(0).x()+snakeNodeWidth, this ->height()))); } else { snake.insert(0,QRectF(snake.at(0).topLeft()+QPointF(0,-snakeNodeHeight),snake.at(0).topRight())); } } //向下移动 void Widget::addDownRectF() { if (snake.at(0).y()+snakeNodeHeight*2 > this ->height()){ snake.insert(0,QRectF(QPointF(snake.at(0).x(),snakeNodeHeight), QPointF(snake.at(0).x()+snakeNodeWidth,0))); } else { snake.insert(0,QRectF(snake.at(0).bottomLeft(),snake.at(0).bottomRight()+QPointF(0,snakeNodeHeight))); } } //向左移动 void Widget::addLeftRectF() { if (snake.at(0).x()-snakeNodeWidth < 0){ snake.insert(0,QRectF(QPointF( this ->width()-snakeNodeWidth,snake.at(0).y()), QPointF( this ->width(),snake.at(0).y()+snakeNodeHeight))); } else { snake.insert(0,QRectF(snake.at(0).topLeft()+QPointF(-snakeNodeWidth,0),snake.at(0).bottomLeft())); } } //向右移动 void Widget::addRightRectF() { if (snake.at(0).x()+snakeNodeWidth*2 > this ->width()){ snake.insert(0,QRectF(QPointF(0,snake.at(0).y()), QPointF(snakeNodeWidth,snake.at(0).y()+snakeNodeHeight))); } else { snake.insert(0,QRectF(snake.at(0).topRight(),snake.at(0).bottomRight()+QPointF(snakeNodeWidth,0))); } } //删除结尾数据 void Widget::deleteLastRectF() { snake.removeLast(); } |
绘图
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//绘图 void Widget::paintEvent(QPaintEvent *event) { QPainter painter( this ); QPen pen; QBrush brush; QFont font( "方正舒体" ,12,QFont::ExtraLight, false ); //反锯齿 painter.setRenderHint(QPainter::Antialiasing); pen.setColor(Qt::black); brush.setColor(Qt::green); brush.setStyle(Qt::SolidPattern); painter.setPen(pen); painter.setBrush(brush); for ( int i=0; i<snake.length(); i++){ painter.drawRect(snake.at(i)); } brush.setColor(Qt::red); painter.setBrush(brush); for ( int i=0; i<rewardNode.length(); i++){ painter.drawEllipse(rewardNode.at(i)); } pen.setColor(Qt::white); painter.setPen(pen); painter.setFont(font); painter.drawText(20,20,QString( "当前得分:" )+QString( "%1" ).arg(snake.length())); if (snakeStrike()){ QFont font( "方正舒体" ,30,QFont::ExtraLight, false ); painter.setFont(font); painter.drawText(( this ->width()-300)/2,( this ->height()-30)/2,QString( "GAME OVER!" )); timer->stop(); rewardTimer->stop(); gameOver = true ; } QWidget::paintEvent(event); } |
按键事件
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void Widget::keyPressEvent(QKeyEvent *event) { switch (event->key()){ case Qt::Key_Up: if (moveFlage != Down){ moveFlage = Up; } break ; case Qt::Key_Down: if (moveFlage != Up){ moveFlage = Down; } break ; case Qt::Key_Right: if (moveFlage != Left){ moveFlage = Right; } break ; case Qt::Key_Left: if (moveFlage != Right){ moveFlage = Left; } break ; case Qt::Key_Enter: case Qt::Key_Return: if (gameOver){ snake.clear(); rewardNode.clear(); moveFlage = Up; snake.append(QRectF(200,500,snakeNodeWidth,snakeNodeHeight)); addTopRectF(); addTopRectF(); //首先生成一个奖励节点 rewardNode.append(QRectF(100,100,snakeNodeWidth,snakeNodeWidth)); timer->start( time ); rewardTimer->start( time *30); gameOver = false ; } break ; case Qt::Key_Space: if (gameStart && !gameOver){ timer->start( time ); rewardTimer->start( time *30); gameStart = false ; } else if (!gameStart && !gameOver){ timer->stop(); rewardTimer->stop(); gameStart = true ; } break ; default : break ; } } |
判断蛇身是否相撞
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//判断蛇头是否和蛇身相撞 bool Widget::snakeStrike() { for ( int i=0; i<snake.length(); i++){ for ( int j=i+1; j<snake.length(); j++){ if (snake.at(i) == snake.at(j)){ return true ; } } } return false ; } |
五、结束
实现的效果:
总结:
只是简单的使用了paintevent进行绘图,基本都是简单的对Qt的一些常用类的使用,对面向对象的编程应用的不是很好,更偏向于面向过程,所以完全可以改成C语言在Linux下实现,思路都是相同的。
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原文链接:https://blog.csdn.net/sinan1995/article/details/81671311