}
}
/*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(!kbhit())/*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 == UPsnake.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)*/
}
/*游戏结束*/
void GameOver(void)
{
cleardevice();
PrScore();
setcolor(RED);
settextstyle(0, 0, 4);
outtextxy(200, 200, "GAME OVER");

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