snake算法贪食蛇游戏解释

贪食蛇游戏解释

*玩游戏具体过程*/ void GamePlay(void) { randomize();/*随机数发生器*/ 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]=100;snake.y[0]=100;/*蛇头*/ snake.x[1]=110;snake.y[1]=100; snake.node=2;/*节数*/ PrScore();/*输出得分*/ while(1)/*可以重复玩游戏,压ESC键结束*/ { while(!32313133353236313431303231363533e78988e69d8331333335303561kbhit())/*在没有按键的情况下,蛇自己移动身体*/ { if(food.yes==1)/*需要出现新食物*/ { food.x=rand()%400+60; food.y=rand()%350+60; 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*/ { setcolor(GREEN); rectangle(food.x,food.y,food.x+10,food.y-10); } 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*/ 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]) { GameOver();/*显示失败*/ snake.life=1; break; } } if(snake.x[0]<55||snake.x[0]>595||snake.y[0]<55|| snake.y[0]>455)/*蛇是否撞到墙壁*/ { GameOver();/*本次游戏结束*/ snake.life=1; /*蛇死*/ } if(snake.life==1)/*以上两种判断以后,如果蛇死就跳出内循环，重新开始*/ break; if(snake.x[0]==food.x&&snake.y[0]==food.y)/*吃到食物以后*/ { setcolor(0);/*把画面上的食物东西去掉*/ rectangle(food.x,food.y,food.x+10,food.y-10); 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; PrScore();/*输出新得分*/ } setcolor(4);/*画出蛇*/ for(i=0;i<snake.node;i++) rectangle(snake.x[i],snake.y[i],snake.x[i]+10, snake.y[i]-10); delay(gamespeed); setcolor(0);/*用黑色去除蛇的的最后一节*/ rectangle(snake.x[snake.node-1],snake.y[snake.node-1], snake.x[snake.node-1]+10,snake.y[snake.node-1]-10); } /*endwhile（！kbhit）*/ if(snake.life==1)/*如果蛇死就跳出循环*/ break; key=bioskey(0);/*接收按键*/ if(key==ESC)/*按ESC键退出*/ break; else 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; }/*endwhile(1)*/ } /*输出成绩*/ void PrScore(void) { char str[10]; setfillstyle(SOLID_FILL,YELLOW); bar(50,15,220,35); setcolor(6); settextstyle(0,0,2); sprintf(str,"score:%d",score); outtextxy(55,20,str); }