QT贪食蛇小游戏源代码

/**************************************************************************** ** 贪吃蛇程序说明： ** ** 上下左右控制方向，esc重新开始，P键暂停游戏 ** ** 游戏5个关卡，gamespeed为游戏速度，吃10个方块进入下关，游戏暂停，按P键继续 ** ** QT3的代码，供大家交流！ ** ** --by snailshell mail：youngst@yeah.net ****************************************************************************/ #include <qapplication.h> #include <qpalette.h> #include "snake.h" #define N 100 #define LEFT 0x1012 #define RIGHT 0x1014 #define DOWN 0x1015 #define UP 0x1013 #define ESC 0x1000 #define PAUSE 0X50 struct Food { int x;/*食物的横坐标*/ int y;/*食物的纵坐标*/ int yes;/*判断是否要出现食物的变量*/ }food; /*食物的结构体*/ struct Snake { int x[N]; int y[N]; int node;/*蛇的节数*/ int direction;/*蛇移动方向*/ int life;/* 蛇的生命,0活着,1死亡*/ }snake; SnakeGame::SnakeGame(QWidget *parent,const char *name,WFlags f):QWidget(parent,name,f) { SnakeTime=new QTimer(this); QObject::connect(SnakeTime,SIGNAL(timeout()),this,SLOT(SnakeRun())); lcd =new QLCDNumber(5,this,""); lcd->setSegmentStyle( QLCDNumber::Flat ); lcd->setFrameStyle( QFrame::NoFrame | QFrame::Plain ); InitGame(); } void SnakeGame::paintEvent(QPaintEvent *event) { QPainter paint( this ); QRect v = paint.viewport(); paint.setViewport( v.left() , v.top() , width(), height()); lcd->setGeometry(width()-100,5,100,30); DrawGame(&paint); PlayGame(&paint); } void SnakeGame::InitGame() { pause=1;stage=1,score=0;gamespeed =400; key=0; setPaletteBackgroundColor(QColor(192,253,123)); SnakeTime->start(gamespeed,false); food.yes=1;/*1表示需要出现新食物,0表示已经存在食物*/ snake.life=0;/*活着*/ snake.direction=1;/*方向往右*/ snake.x[0]=50;snake.y[0]=100;/*蛇头*/ snake.x[1]=40;snake.y[1]=100; snake.node=2;/*节数*/ } void SnakeGame::SnakeRun() { update(); } void SnakeGame::GameScore() { lcd->display (score); } void SnakeGame::DrawGame(QPainter *painter) { painter->setPen( QPen(QColor( 41,75,35),1,Qt::SolidLine,Qt::RoundCap,Qt::RoundJoin)); for(i=0;i<=18;i+=2)/*画围墙*/ { painter->drawRect(i,i+40,width()-2*i,height()-2*i-40); } } void SnakeGame::PlayGame(QPainter *painter) { GameScore();/*输出得分*/ if(food.yes==1)/*需要出现新食物*/ { food.x=rand()%width()/2+20; food.y=rand()%height()/2+20+40; while(food.x%10!=0)/*食物随机出现后必须让食物能够在整格内,这样才可以让蛇吃到*/ food.x++; while(food.y%10!=0) food.y++; food.yes=0;/*画面上有食物了*/ } if(food.yes==0)/*画面上有食物了就要显示*/ {painter->setBrush( QColor(Qt::yellow )); painter->drawRoundRect(food.x,food.y,10,10,50,50); } if(snake.life==0&&pause==1)/*蛇移动*/ { QString str; str = QString( "GAME STAGE : %1" ) .arg( stage); painter->drawText(10,20,str); for(i=snake.node-1;i>0;i--)/*蛇的每个环节往前移动,也就是贪吃蛇的关键算法*/ { snake.x[i]=snake.x[i-1]; snake.y[i]=snake.y[i-1]; } /*1,2,3,4表示右,左,上,下四个方向,通过这个判断来移动蛇头*/ if(key==UP&&snake.direction!=4) /*判断是否往相反的方向移动*/ snake.direction=3; else if(key==RIGHT&&snake.direction!=2) snake.direction=1; else if(key==LEFT&&snake.direction!=1) snake.direction=2; else if(key==DOWN&&snake.direction!=3) snake.direction=4; switch(snake.direction) { case 1: snake.x[0]+=10;break; case 2: snake.x[0]-=10;break; case 3: snake.y[0]-=10;break; case 4: snake.y[0]+=10;break; } for(i=3;i<snake.node;i++)/*从蛇的第四节开始判断是否撞到自己了，因为蛇头为两节，第三节不可能拐过来*/ { if(snake.x[i]==snake.x[0]&&snake.y[i]==snake.y[0]) { snake.life=1; break; } } if(snake.x[0]<30||snake.x[0]>width()-40||snake.y[0]<70|| snake.y[0]>height()-40)/*蛇是否撞到墙壁*/ { snake.life=1; /*蛇死*/ } if(snake.x[0]==food.x&&snake.y[0]==food.y)/*吃到食物以后*/ { painter->setBrush( QColor( 192,253,123)); painter->drawRoundRect(food.x,food.y,10,10,50,50); /*把画面上的食物东西去掉*/ snake.x[snake.node]=-20;snake.y[snake.node]=-20; /*新的一节先放在看不见的位置,下次循环就取前一节的位置*/ snake.node++;/*蛇的身体长一节*/ food.yes=1;/*画面上需要出现新的食物*/ score+=10; GameScore();/*输出新得分*/ if(snake.node>10*stage+1&&stage<6) { stage+=1; gamespeed=gamespeed-100; pause=0; }/*关卡速度变快，游戏暂停*/ } } else { SnakeTime->stop(); if(pause==1)painter->drawText(10,20,"GAME OVER!"); else painter->drawText(10,20,"GAME PAUSE!"); }/*游戏结束、暂停*/ painter->setBrush( QColor( Qt::red)); painter->drawRoundRect(snake.x[0],snake.y[0],10, 10,50,50); painter->setBrush( QColor( Qt::blue)); for(i=1;i<snake.node;i++) painter->drawRoundRect(snake.x[i],snake.y[i],10, 10,50,50);/*画出蛇*/ painter->setPen( QPen(QColor( QColor(192,253,123)),1,Qt::SolidLine,Qt::RoundCap,Qt::RoundJoin)); painter->setBrush( QColor( 192,253,123)); painter->drawRoundRect(snake.x[snake.node-1],snake.y[snake.node-1], 10,10,50,50);/*去除蛇的的最后一节*/ } void SnakeGame::keyPressEvent(QKeyEvent *k) { key= k->key(); if(key==ESC){SnakeTime->stop();InitGame();} if(key==PAUSE) { if(SnakeTime->isActive()) {//SnakeTime->stop(); pause=0;} else { SnakeTime->start(gamespeed,false); pause=1; } } }