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#include <graphics.h>
#include <stdlib.h>
#include <conio.h>
#include <time.h>
#include <stdio.h>
#include "snake.h"
int score = 0;
int gamespeed = 100; //蛇运行速度
static void Init(void); /*图形驱动*/
static void Close(void); /*图形结束*/
static void Game_interface(void); /*游戏界面*/
static void GameOver(void); /*结束游戏*/
static void GamePlay(void); /*游戏过程*/
static void PrScore(void); /*输出成绩*/
/*主函数*/
int main(void)
{
Init();
Game_interface();
GamePlay();
Close();
return 0;
}
/*图形驱动*/
static void Init(void)
{
int gd=9,gm=2;
initgraph(&gd,&gm," ");
cleardevice();
}
/* 开始画面，左上角坐标为（50，40），右下角坐标为（610，460）的围墙 */
static void Game_interface(void)
{
int i;
setcolor(LIGHTCYAN); /*setbkcolor(LIGHTGREEN);*/
setlinestyle(PS_SOLID,0,1); /*设置线型*/
for(i=50;i<=600;i+=10) /*画边框*/
{
rectangle(i,40,i+10,49); /*上边框*/
rectangle(i,451,i+10,460); /*下边框*/
}
for(i=40;i<=450;i+=10)
{
rectangle(50,i,59,i+10); /*左边框*/
rectangle(601,i,610,i+10); /*右边框*/
}
}
/* 游戏主函数 */
static void GamePlay(void)
{
int i;
srand(time(NULL)); /*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;
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( !kbhit() ) /*在没有按键的情况下,蛇自己移动*/
{
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;
}
/* 从蛇的第四节开始判断是否撞到自己 */
for(i=3;i<snake.node;i++)
{
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(BLACK); /*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(RED); /*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);
Sleep(gamespeed);
setcolor(BLACK); /*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=getch(); /*接收按键*/
if (key == ESC) break; /*按ESC键退出*/
switch(key)
{
case UP:
if(snake.direction != 4) /*判断是否往相反的方向移动*/
snake.direction = 3;
break;
case RIGHT:
if(snake.direction != 2)
snake.direction = 1;
break;
case LEFT:
if(snake.direction != 1)
snake.direction = 2;
break;
case DOWN:
if(snake.direction != 3)
snake.direction = 4;
break;
}
}/*endwhile(1)*/
}
/*游戏结束*/
static void GameOver(void)
{
cleardevice();
PrScore();
setcolor(RED);
setfont(56,0,"黑体");
outtextxy(200,200,"GAME OVER");
getch();
}
/*输出成绩*/
static void PrScore(void)
{
char str[10];
setfillstyle(YELLOW);
bar(50,15,220,35);
setcolor(BROWN);
setfont(16,0,"宋体");
sprintf(str,"score:%d",score);
outtextxy(55,16,str);
}
static void Close(void)
{
closegraph();
}
#ifndef SNAKE_H
#define SNAKE_H
#define LEFT 'a'
#define RIGHT 'd'
#define DOWN 's'
#define UP 'w'
#define ESC 27
#define N 200 /*蛇的最大长度*/
char key; /*控制按键*/
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;
#endif