看过贪吃蛇代码的大哥进来！

[jk295]

#define N 200
#include <graphics.h>
#include <stdlib.h>
#include <dos.h>
#define LEFT 0x4b00
#define RIGHT 0x4d00
#define DOWN 0x5000
#define UP 0x4800
#define ESC 0x011b
int i,key;
int score=0;
int gamespeed=50000;
struct Food
{
    int x;
    int y;
    int yes;
}food;
struct snake{
    int x[N];
    int y[N];
    int node;
    int direction;
    int life;
}snake;
void Init(void);
void Close(void);
void DrawK(void);
void GameOver(void);
void GamePlay(void);
void PrScore(void);

void main(void)
{
    Init();
    DrawK();
    GamePlay();
    Close();
}

void Init(void)
{
    int gd=DETECT,gm;
    initgraph(&gd,&gm,"D:\\tc20\\BGI");
    cleardevice();
}

void DrawK(void)
{
    setcolor(11);
    setlinestyle(SOLID_LINE,0,THICK_WIDTH);
    for(i=50;i<=600;i+=10)
    {
        rectangle(i,40,i+10,49);
        rectangle(i,451,i+10,460);
    }
    for(i=40;i<=450;i+=10)
    {
        rectangle(50,i,59,i+10);
        rectangle(601,i,610,i+10);
    }
}

void GamePlay(void)
{
    randomize();
    food.yes=1;
    snake.life=0;
    snake.direction=1;
    snake.x[0]=100;snake.y[0]=100;
    snake.x[1]=110;snake.y[1]=100;
    snake.node=2;
    PrScore();
    while(1)
    {
        while(!kbhit())
        {
            if(food.yes==1)
            {
                food.x=rand()%400+60;
                food.y=rand()%350+60;
                while(food.x%10!=0)
                    food.x++;           
                while(food.y%10!=0)
                    food.y++;
                food.yes=0;
            }
            if(food.yes==0)
            {
                setcolor(GREEN);
                rectangle(food.x,food.y,food.x+10,food.y-10);
            }
            for(i=snake.node-1;i>0;i--)
            {
                snake.x[i]=snake.x[i-1]; //这里的赋值有什么意义？
                snake.y[i]=snake.y[i-1]; //为什么这么赋值
            }
            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++)
            {
                if(snake.x[i]==snake.x[0]&&snake.y[i]==snake.y[0])
                {
                    GameOver();
                    snake.life=1;
                    break;
                }
            }
            if(snake.x[0]<55||snake.x[0]>595||snake.y[0]<55||snake.y[0]>455)
            {
                GameOver();
                snake.life=1;
            }
            if(snake.life==1)
                break;
            if(snake.x[0]==food.x&&snake.y[0]==food.y)
            {
                setcolor(0);
                rectangle(food.x,food.y,food.x+10,food.y-10);

                snake.x[snake.node]=-20;    //这里是
                snake.y[snake.node]=-20;    //什么意思？为什么要这么赋值？？？

                snake.node++;
                food.yes=1;
                score+=10;
                PrScore();
            }
            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(gamespeed);
            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); 
        }
        if(snake.life==1)
            break;
        key=bioskey(0);
        if(key==ESC)
            break;
        else if(key==UP&&snake.direction!=4)
            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;
    }
}

void GameOver(void)
{
    cleardevice();
    PrScore();
    setcolor(RED);
    settextstyle(0,0,4);
    outtextxy(200,200,"GAME OVER");
    getch();
}

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);
}

void Close(void)
{
getch();
closegraph();
}

 

 

[z569362161]

让我们近来有什么问题啊？

[z569362161]

就是看代码啊！你写的很好，格式很标准

[极夜之辉]

问题在注释里写着，谢谢大伙了！

[swl82560397pq]

snake.x[i]=snake.x[i-1]; //这里的赋值有什么意义？
snake.y[i]=snake.y[i-1]; //为什么这么赋值
这里是蛇的移动，刷新后下一节的位置就是前一节的位置，比如蛇的第二节的下一位置就是蛇的第一节的此时位置。

snake.x[snake.node]=-20; //这里是
snake.y[snake.node]=-20; //什么意思？为什么要这么赋值？？？
这里是先让蛇的最后一个节点在可视范围之类，本人觉得这2行没多大意义。

[ylwdi]

main()

[极夜之辉]

我已经看出来了，谢谢4楼的大哥

[mouweiqiao]

其实还是没大懂这两行，高手可否详细解说一下哈，初学者很是悲催啊~拜托了
snake.x[snake.node]=-20; //这里是
snake.y[snake.node]=-20; //什么意思？为什么要这么赋值？？？
这里是先让蛇的最后一个节点在可视范围之类


为什么要先让蛇的最后一节在可视范围内啊？我看到论坛中有些解释是“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 ”
表示对这个解释很不明白，高手们帮帮忙吧~