#include <graphics.h>
#include <stdlib.h>
#include <dos.h>
/*定义控制命令*/
#define LEFT 0x4b00
#define RIGHT 0x4d00
#define DOWN 0x5000
#define UP 0x4800
#define ESC 0x011b
/*定义蛇的最大节数*/
#define NODE 200
int i,key;
int score=0;/*得分*/
/*定义游戏速度*/
int SPEED=100;
/*定义食物的结构体*/
struct Food
{
int x;/*食物的横坐标*/
int y;/*食物的纵坐标*/
int need;/*判断是否要出现食物的变量*/
};
/*定义蛇的结构体*/
struct Snake
{
int x[NODE];
int y[NODE];
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*/
};
struct Food food;
struct Snake snake;
/*开始画面，左上角坐标为（50，40），右下角坐标为（600，450）的围墙*/
void DrawFence(void)
{
setcolor(WHITE);
/*画围墙的上边*/
line(50,40,600,40);
line(50,42,600,42);
/*画围墙的下边*/
line(50,450,600,450);
line(50,452,600,452);
/*画围墙的左边*/
line(50,40,50,450);
line(52,40,52,450);
/*画围墙的右边*/
line(600,40,600,450);
line(602,40,602,450);
}
/*输出成绩*/
void PrintScore()
{
char string[10];
setfillstyle(SOLID_FILL,YELLOW);
bar(50,15,220,35);
setcolor(RED);
settextstyle(0,0,2);
sprintf(string,"score:%d",score);
outtextxy(55,20,string);
}
/*游戏结束*/
void GameOver()
{
cleardevice();
PrintScore();
setcolor(RED);
settextstyle(0,0,4);
outtextxy(200,200,"GAME OVER");
getch();
}
/*画蛇函数*/
void DrawSnake()
{
setcolor(4);
for(i=0;i<snake.node;i++)
rectangle(snake.x[i],snake.y[i],snake.x[i]+10,snake.y[i]-10);
delay(SPEED);
setcolor(0);
rectangle(snake.x[snake.node-1],snake.y[snake.node-1],
snake.x[snake.node-1]+10,snake.y[snake.node-1]-10);
}
/*玩游戏具体过程*/
void PlayGame()
{
randomize();/*随机数发生器*/
food.need=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*/
/*方向往右*/
snake.direction=1;
/*蛇头*/
snake.x[0]=100;
snake.y[0]=100;
snake.x[1]=110;
snake.y[1]=100;
snake.node=2;/*节数*/
PrintScore();/*输出得分*/
while(1)/*可以重复玩游戏,压ESC键结束*/
{
while(!kbhit())/*在没有按键的情况下,蛇自己移动身体*/
{
if(food.need==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.need=0;/*画面上有食物了*/
}
if(food.need==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.need=1;/*画面上需要出现新的食物*/
score+=10;
PrintScore();/*输出新得分*/
}
DrawSnake();
}
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;
}
}
/*主函数*/
void main(void)
{
int gd=DETECT,gm;
initgraph(&gd,&gm,"e:\\tc");
cleardevice();
/*绘制边框*/
DrawFence();
/*玩游戏具体过程*/
PlayGame();
getch();
closegraph();
}
