【C++贪吃蛇实例】用QT实现一个贪吃蛇小游戏

#include "mainui.h" #include "ui_mainui.h" mainUi::mainUi(QWidget *parent) : QWidget(parent) { // ui->setupUi(this); this->setWindowTitle("行走的小蜜蜂"); this->setWindowIcon(QIcon(":/photo/green.jpg")); resize(mapMax+10,mapMax+10); setStyleSheet("QWidget{background:white}"); //设置窗口颜色 setWindowFlags(Qt::FramelessWindowHint);//去掉标题栏 this->setAttribute(Qt::WA_TranslucentBackground);//设置背景透明 srand((unsigned)time(NULL));//把时间作为随机数种子 timer = new QTimer;//创建一个定时器对象 timer->start(100);//开启定时器100ms connect(timer,&QTimer::timeout,this,&mainUi::timefoult); snake_x<<100<<100<<100<<100;//定义坐标 snake_y<<100<<110<<120<<130; } mainUi::~mainUi() { delete ui; } /* 遍历整个列表：同X坐标判断，每次只移动一次 */ void mainUi::moveLeft()//移动 { int snakexbrfore[2]={0},snakeybrfore[2]={0},signale=0; if((snake_x[0]>snake_x[1]&&snake_y[0]==snake_y[1])||snake_x[0]<=mapMin){signale=1;} for(int i=0;i<snake_y.length()&&signale==0;i++) { if(i==0){ snakexbrfore[0]=snake_x[i];snakeybrfore[0]=snake_y[i]; snake_x[i]-=snake_boy; if(snake_x[i]==beanx&&snake_y[i]==beany){ snake_x.append(beanx);snake_y.append(beany); beanx=-mapMax;beany=-mapMax; } continue; } movedll(snakexbrfore,snakeybrfore,i); } } void mainUi::moveRight() { int snakexbrfore[2]={0},snakeybrfore[2]={0},signale=0; if((snake_x[0]<snake_x[1]&&snake_y[0]==snake_y[1])||snake_x[0]>=mapMax){signale=1;} for(int i=0;i<snake_y.length()&&signale==0;i++) { if(i==0){ snakexbrfore[0]=snake_x[i];snakeybrfore[0]=snake_y[i]; snake_x[i]+=snake_boy; if(snake_x[i]==beanx&&snake_y[i]==beany){ snake_x.append(beanx);snake_y.append(beany); beanx=-mapMax;beany=-mapMax; } continue; } movedll(snakexbrfore,snakeybrfore,i); } } //除了第一个，之后每次的坐标都和前一次坐标相等 void mainUi::moveUp()//要注意移动的时候的坐标 { int snakexbrfore[2]={0},snakeybrfore[2]={0},signale=0; if((snake_y[0]>snake_y[1]&&snake_x[0]==snake_x[1])||snake_y[0]<=mapMin){signale=1;}//判断蛇头的有没有出界线 for(int i=0;i<snake_y.length()&&signale==0;i++)//如果没有就吃豆子 { if(i==0&&snake_y[i]<=snake_y[i+1]){ snakexbrfore[0]=snake_x[i];snakeybrfore[0]=snake_y[i]; snake_y[i]-=snake_boy; if(snake_x[i]==beanx&&snake_y[i]==beany){ snake_x.append(beanx);snake_y.append(beany); beanx=-mapMax;beany=-mapMax; } continue; } movedll(snakexbrfore,snakeybrfore,i); } } void mainUi::moveDown() { int snakexbrfore[2]={0},snakeybrfore[2]={0},signale=0; if((snake_y[0]<snake_y[1]&&snake_x[0]==snake_x[1])||snake_y[0]>=mapMax){signale=1;} for(int i=0;i<snake_y.length()&&signale==0;i++) { if(i==0){ snakexbrfore[0]=snake_x[i];snakeybrfore[0]=snake_y[i]; snake_y[i]+=snake_boy; if(snake_x[i]==beanx&&snake_y[i]==beany){ snake_x.append(beanx);snake_y.append(beany); beanx=-mapMax;beany=-mapMax; } continue; } movedll(snakexbrfore,snakeybrfore,i); } } void mainUi::movedll(int *x,int *y,int i)//公共函数部分 { *(x+1)=snake_x[i];*(y+1)=snake_y[i]; snake_x[i]=*x;snake_y[i]=*y; *x=*(x+1);*y=*(y+1); } void mainUi::getaBean()//生成一个豆子,也就是随机生成一个整数坐标(位于500之内) { //用四舍五入法生成坐标 int x=40+(rand()%mapMax-40),y=rand()%mapMax;//X，Y的范围为40 ~ mapMax之间 if((x%10)!=0){x+=(10-(x%10));} if((y%10)!=0){y+=(10-(y%10));} beanx=x,beany=y; } void mainUi::timefoult() { current_time++; if(moveFlag == 'D') { moveDown(); } if(moveFlag == 'U') { moveUp(); } if(moveFlag == 'L') { moveLeft(); } if(moveFlag == 'R') { moveRight(); } update(); } void mainUi::keyPressEvent(QKeyEvent *event) //定义键盘事件 { switch(event->key()) { case Qt::Key_Up: // moveUp(); if(moveFlag!= 'D') { moveFlag ='U'; } break; case Qt::Key_Down: if(moveFlag !='U') { moveFlag ='D'; } break; case Qt::Key_Right: if(moveFlag != 'L') { moveFlag ='R'; } break; case Qt::Key_Left: if(moveFlag != 'R') { moveFlag='L'; } break; case Qt::Key_Space: getaBean(); break; case Qt::Key_Escape://退出游戏 this->close(); } update(); } void mainUi::paintEvent(QPaintEvent *event) //画家函数 { QPainter painter(this);//定义一张画布 QPen pen;//定义一张画笔 painter.setPen(pen);//将画笔设置到画布中去 pen.setWidth(snake_boy);//笔刷宽度设置为蛇的宽度 QBrush brs(Qt::black);//设置笔刷为黑色 QFont font("黑体",12,QFont::ExtraLight,false);//计数栏设置 painter.setFont(font);//画布插入字体 painter.drawText(20,20,QString("时间过去:")+QString("%1").arg((int)current_time/10)); painter.drawText(20,40,QString("控制:")+QString("移动：上下左右——出豆子：空格——退出：ESC")); brs.setColor(Qt::darkGray);//改变笔刷颜色 painter.setBrush(brs); //画出矩形,蛇 for(int i=0;i<snake_x.length();i++) { painter.setBrush(brs);//设置画笔笔刷 painter.drawEllipse(snake_x.at(i),snake_y.at(i),snake_boy,snake_boy);//画出蛇的身体 } //画豆子 if(beanx>0&&beany>0) { brs.setColor(Qt::darkMagenta);//设置豆子颜色 brs.setStyle(Qt::ConicalGradientPattern);//设置笔刷样式 painter.setBrush(brs); painter.drawRect(beanx,beany,snake_boy,snake_boy);//画出豆子的身体 } }