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// greedsnake.cpp
#include <bios.h>
#include <conio.h>
#include <dos.h>
#include <graphics.h>
#include <stdlib.h>
#include <time.h>
#include "conf.h"
typedef struct node
{
int x,y;
struct node *next;
}Node;
typedef struct
{
Node *head,*tail;
int length;
}Snake;
typedef struct
{
int left,top,right,bottom;
}Frame;
typedef enum //四个方向
{
up,down,left,right
}Direction;
typedef enum
{
false,true
}bool;//*/
void InitGraphMode(); //初始化图形驱动
void CloseGraphMode();
void Foot(int,int);
void Head(int,int);
void CreateFrame(); //完成整个游戏框架的绘制
void CreateSnake(); //创建一条两个节点的蛇,蛇的每一节是队列中的一个节点
bool PlayGame(); //游戏的主体函数,
int Hit(int,int); //判断是否越界,或者撞到自身,两个参数分别是新的头接点的x,y坐标
bool GameOver(); //绘制游戏结束时弹出的对话框
void Enqueue(Node); //入队函数
Node Dequeue(); //出队函数
void ClearKeyBuf(); //清除键盘缓冲,此函数可以消除不停的按无效键的影响
Snake snake;
Frame frame;
void main()
{
InitGraphMode();
do
{
CreateFrame();
}while(PlayGame());
CloseGraphMode();
}
void InitGraphMode()
{
int gdriver=DETECT,gmode;
initgraph(&gdriver,&gmode,"../bgi/");
cleardevice();
}
void CloseGraphMode()
{
cleardevice();
closegraph();
}
void CreateFrame()
{
setbkcolor(CYAN);
//下面的四行代码用于计算主框架的左上角和右下角的坐标
frame.left=(getmaxx()+1-BlockWidth*RowOfFrame)/2;
frame.top=(getmaxy()+1-BlockHeight*ColumnOfFrame)/2;
frame.right=frame.left+BlockWidth*RowOfFrame;
frame.bottom=frame.top+BlockHeight*ColumnOfFrame;
Head(frame.left+100,frame.top-20);
setfillstyle(SOLID_FILL,LIGHTGRAY);
bar(frame.left,frame.top,frame.right,frame.bottom);
setlinestyle(SOLID_LINE,1,1);
setcolor(DARKGRAY);
line(frame.left,frame.top,frame.right,frame.top);
line(frame.left,frame.top,frame.left,frame.bottom);
setlinestyle(SOLID_LINE,1,1);
setcolor(WHITE);
line(frame.left,frame.bottom,frame.right,frame.bottom);
line(frame.right,frame.top,frame.right,frame.bottom);
setlinestyle(DOTTED_LINE,1,1);
setcolor(BLUE);
for(int row=1;row<RowOfFrame;row++)
line(frame.left+row*BlockWidth,frame.top,frame.left+row*BlockWidth,frame.bottom);
for(int column=1;column<ColumnOfFrame;column++)
line(frame.left,frame.top+column*BlockHeight,frame.right,frame.top+column*BlockHeight);
Foot(frame.left,frame.bottom+20);
}
void CreateSnake()
{
Node *node1=new Node;
Node *node2=new Node;
node1->x=frame.left+BlockWidth;
node1->y=frame.top;
node1->next=NULL;
snake.tail=node1;
node2->x=frame.left;
node2->y=frame.top;
node2->next=snake.tail;
snake.head=node2;
snake.length=2;
setfillstyle(SOLID_FILL,BLUE);
bar(snake.head->x+1,snake.head->y+1,snake.head->x+BlockWidth-1,snake.head->y+BlockHeight-1);
bar(snake.tail->x+1,snake.tail->y+1,snake.tail->x+BlockWidth-1,snake.tail->y+BlockHeight-1);
}
bool PlayGame()
{
int speed=300,key;
Direction CurrentDirection=right;
Node randomNode;
Node newNode,outNode;
bool neednode=true;
bool overlap=false;
int randx,randy;
CreateSnake();
while(true)
{
if(neednode==true)
{
randomize();
do
{
randx=frame.left+rand()%RowOfFrame*BlockWidth;
randy=frame.top+rand()%ColumnOfFrame*BlockHeight;
for(Node *p=snake.head;p!=NULL;p=p->next)//hit itself
if(randx==p->x&&randy==p->y)
{overlap=true;break;}
}
while(overlap==true);
randomNode.x=randx;
randomNode.y=randy;
randomNode.next=NULL;
setfillstyle(SOLID_FILL,RED);
bar(randomNode.x+1,randomNode.y+1,randomNode.x+BlockWidth-1,randomNode.y+BlockHeight-1);
neednode=false;
}
if((key=bioskey(1))!=0)
{
switch(key)
{
case ESC: return false;
case UP:
if(CurrentDirection!=down)
CurrentDirection=up;
ClearKeyBuf();
break;
case DOWN:
if(CurrentDirection!=up)
CurrentDirection=down;
ClearKeyBuf();
break;
case LEFT:
if(CurrentDirection!=right)
CurrentDirection=left;
ClearKeyBuf();
break;
case RIGHT:
if(CurrentDirection!=left)
CurrentDirection=right;
ClearKeyBuf();
break;
case PAGEUP:speed=speed-100;
if(speed<100)
speed=100;
ClearKeyBuf();
break;
case PAGEDOWN:speed=speed+100;
if(speed>500)
speed=500;
ClearKeyBuf();
break;
default :break;
}
}
int headx=snake.tail->x;
int heady=snake.tail->y;
switch(CurrentDirection)
{
case up: heady-=BlockHeight;break;
case down: heady+=BlockHeight;break;
case left: headx-=BlockWidth;break;
case right: headx+=BlockWidth;break;
}
if(Hit(headx,heady)) //whether the snake hit the wall or itself
return GameOver();
else
{ //eat
if(headx==randomNode.x&&heady==randomNode.y)
{
Enqueue(randomNode);
setfillstyle(SOLID_FILL,BLUE);
bar(randomNode.x+1,randomNode.y+1,randomNode.x-1+BlockWidth,randomNode.y-1+BlockHeight);
neednode=true;
}
else //no eat
{
newNode.x=headx;
newNode.y=heady;
newNode.next=NULL;
Enqueue(newNode);
outNode=Dequeue();
setfillstyle(SOLID_FILL,LIGHTGRAY);
bar(outNode.x+1,outNode.y+1,outNode.x+BlockWidth-1,outNode.y+BlockHeight-1);
setfillstyle(SOLID_FILL,BLUE);
bar(newNode.x+1,newNode.y+1,newNode.x-1+BlockWidth,newNode.y-1+BlockHeight);
}
}
delay(speed);
}
}
void ClearKeyBuf()
{
do
bioskey(0);
while(bioskey(1));
}
void Foot(int x,int y)
{
setcolor(BLUE);
outtextxy(x,y,"writer:[T]RealXL E-MAIL:realgeneral@hotmail.com");
}
void Head(int x,int y)
{
setcolor(RED);
outtextxy(x,y,"GREEDY SNAKE");
}
void Enqueue(Node inNode)
{
Node *p=new Node;
p->x=inNode.x;
p->y=inNode.y;
p->next=inNode.next;
snake.tail->next=p;
snake.tail=p;
snake.length++;
}
Node Dequeue()
{
Node *p=snake.head;
Node outNode=*p;
snake.head=p->next;
snake.length--;
delete p;
return outNode;
}
int Hit(int x,int y)
{
if(x<frame.left||x>=frame.right||y<frame.top||y>=frame.bottom)//hit the wall
return 1;
Node *p=snake.head->next;
for(int i=snake.length-1;i>3;i--,p=p->next)//hit itself
if(x==p->x&&y==p->y)
return 1;
return 0;
}
bool GameOver()
{
int x=getmaxx()/2-50;
int y=getmaxy()/2-20;
setfillstyle(SOLID_FILL,DARKGRAY);
bar(x+3,y+3,x+103,y+43);
setfillstyle(SOLID_FILL,MAGENTA);
bar(x,y,x+100,y+40);
setlinestyle(0,3,1);
setcolor(RED);
rectangle(x,y,x+100,y+40);
outtextxy(x+20,y+10,"GAGE OVER!");
char c;
while(true) //按q或Q表示退出程序,按r或R表示重新开始游戏
{
c=getch();
if(c=='q'||c=='Q')
return false;
else if(c=='r'||c=='R')
return true;
}
}
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