轉自：http://bbs.chinaunix.net/viewthread.php?tid=1170202&extra=page%3D1%26amp%3Bfilter%3Ddigest  

1 /***snake.c***/
  2 #include <stdio.h>
  3 #include <malloc.h>
  4 #include <sys/time.h>
  5 #include <sys/types.h>
  6 #include <sys/select.h>
  7 #include <termio.h>
  8 #include <fcntl.h>
  9 
 10 #define SNAKE_INITX 5
 11 #define SNAKE_INITY 5
 12 #define SNAKE_SHAPE '*'
 13 #define SNAKE_INITLEN 8
 14 
 15 #define WIN_X1 1
 16 #define WIN_X2 80
 17 #define WIN_Y1 1
 18 #define WIN_Y2 24
 19 
 20 #define MAX_LEVEL 20
 21 #define MAX_INTER 200000
 22 #define MIN_INTER 0
 23 #define MAX_RICH 10
 24 #define DEVRATE 5
 25 #define OVER "Game Over!!!"
 26 
 27 struct stNode
 28 {
 29         int x;
 30         int y;
 31         char shape;
 32         struct stNode *next;
 33 };
 34 
 35 struct stFood
 36 {
 37         int x;
 38         int y;
 39 };
 40 
 41 struct stNode *gpstHead,*gpstTail;
 42 struct stFood gastFood[MAX_RICH];
 43 int giLevel=1;
 44 int giRich=1;
 45 int giScore=0;
 46 int giLen=0;
 47 
 48 void settty(int iFlag)
 49 {
 50         int fd;
 51         struct termio stTerm;
 52 
 53         if((fd = open(ttyname(1),O_RDWR))==-1)        return;
 54         if(iFlag == 1)
 55         {
 56                 ioctl(fd,TCGETA,&stTerm);
 57                 stTerm.c_lflag &= ~ICANON;
 58                 stTerm.c_lflag &= ~ECHO;
 59                 stTerm.c_cc[4] = 1;
 60                 stTerm.c_cc[5] = 0;
 61                 stTerm.c_iflag &= ~ISTRIP;
 62                 stTerm.c_cflag |= CS8;
 63                 stTerm.c_cflag &= ~PARENB;
 64                 ioctl(fd,TCSETA,&stTerm);
 65         }
 66         else
 67         {
 68                 ioctl(fd,TCGETA,&stTerm);
 69                 stTerm.c_lflag |= ICANON;
 70                 stTerm.c_lflag |= ECHO;
 71                 stTerm.c_cc[4] = 4;
 72                 stTerm.c_cc[5] = 5;
 73                 stTerm.c_iflag &= ~ISTRIP;
 74                 stTerm.c_cflag |= CS8;
 75                 stTerm.c_cflag &= ~PARENB;
 76                 ioctl(fd,TCSETA,&stTerm);
 77         }
 78         close(fd);
 79 }
 80 
 81 void vDrawOneNode(struct stNode *pstNode,int iFlag)
 82 {
 83         printf("\033[%dm\033[40;%dm\033[%d;%d;H%c",
 84                 iFlag,iFlag*3+30,pstNode->y,pstNode->x,pstNode->shape);
 85         fflush(stdout);
 86 }
 87 
 88 void vDrawOneFood(int x,int y)
 89 {
 90         printf("\033[1m\033[40;36m\033[%d;%d;H%c",y,x,'@');
 91         fflush(stdout);
 92 }
 93 
 94 int iGetDir(int iOriDir)
 95 {
 96         fd_set rset;
 97         struct        timeval        hTmo;
 98         int iRet,iFlag=0;
 99         char cCh;
100 
101         FD_ZERO(&rset);
102         FD_SET(0,&rset);
103         hTmo.tv_sec=0;
104         hTmo.tv_usec=MAX_INTER-(MAX_INTER-MIN_INTER)/MAX_LEVEL*giLevel;
105 
106         iRet=select(1,&rset,NULL,NULL,&hTmo);
107         if(iRet<=0)
108         {
109                 return(iOriDir);
110         }
111         for(;;)
112         {
113                 cCh=getchar();
114                 if(cCh != -1)
115                 {
116                         switch(cCh)
117                         {         
118                         case 27  :
119                         case 91  :
120                                 iFlag++;
121                                 break;
122                         case 65  ://UP
123                         case 66 ://DOWN
124                         case 67  ://RIGHT
125                         case 68 ://LEFT
126                         if(iFlag==2)
127                                 return((!((cCh-0x41)^iOriDir^1))^(cCh-0x41));
128                         default  :
129                                 return(iOriDir);
130                         }
131                 }
132         }
133 }
134 void vInitScreen()
135 {
136         settty(1);
137         printf("\033[?25l\033[2J");
138 }
139 
140 void vRestoreScreen()
141 {
142         printf("\033[24;1H\033[1m\033[40;34m\033[?25h");
143         settty(0);
144 }
145 
146 void vDrawScope()
147 {
148         int i,j;
149         
150         for(j=WIN_Y1;j<=WIN_Y2;j+=WIN_Y2-WIN_Y1)
151         {
152                 printf("\033[%d;%dH+",j,WIN_X1);
153                 for(i=WIN_X1+1;i<WIN_X2;i++)
154                         printf("-");
155                 printf("+");
156         }
157         for(i=WIN_Y1+1;i<WIN_Y2;i++)
158                 printf("\033[%d;%dH|%*c|\n",i,WIN_X1,WIN_X2-WIN_X1-1,' ');
159 }
160 
161 void vCreateSnake()
162 {
163         struct stNode *pstNew;
164         int i;
165 
166         gpstHead=(struct stNode*)malloc(sizeof(struct stNode));
167         gpstHead->x=SNAKE_INITX;        
168         gpstHead->y=SNAKE_INITY;
169         gpstHead->shape=SNAKE_SHAPE;
170         gpstHead->next=NULL;
171         vDrawOneNode(gpstHead,1);
172         gpstTail=gpstHead;
173         for(i=1;i<SNAKE_INITLEN;i++)
174         {
175                 pstNew=(struct stNode*)malloc(sizeof(struct stNode));
176                 pstNew->x=gpstHead->x+1;        
177                 pstNew->y=gpstHead->y;
178                 pstNew->shape=SNAKE_SHAPE;
179                 pstNew->next=NULL;
180                 vDrawOneNode(pstNew,1);
181                 gpstHead->next=pstNew;
182                 gpstHead=pstNew;
183         }
184         return;
185 }
186 
187 void vKillSnake()
188 {
189         struct stNode *pstNode;
190 
191         for(pstNode=gpstTail;gpstTail!=NULL;)
192         {
193                 gpstTail=pstNode->next;
194                 free(pstNode);
195                 pstNode=gpstTail;
196         }
197 }
198 
199 void vGenFood(int iIdx)
200 {
201         struct stNode *pstNode;
202         int i,iFound=0;
203         
204         for(;!iFound;)
205         {
206                 iFound=1;
207                 gastFood[iIdx].x=rand()%(WIN_X2-WIN_X1-1)+WIN_X1+1;
208                 gastFood[iIdx].y=rand()%(WIN_Y2-WIN_Y1-1)+WIN_Y1+1;
209                 for(i=0;i<giRich;i++)
210                 {
211                         if(i!=iIdx && gastFood[iIdx].x==gastFood[i].x &&
212                                 gastFood[iIdx].y==gastFood[i].y)
213                         {
214                                 iFound=0;
215                                 break;
216                         }
217                 }
218                 if(!iFound) continue;
219                 for(pstNode=gpstTail;pstNode!=NULL;pstNode=pstNode->next)
220                 {
221                         if(gastFood[iIdx].x==pstNode->x &&
222                                 gastFood[iIdx].y==pstNode->y)
223                         {
224                                 iFound=0;
225                                 break;
226                         }
227                 }
228                 if(!iFound) continue;
229         }
230         vDrawOneFood(gastFood[iIdx].x,gastFood[iIdx].y);
231 }
232 
233 void vInitFood()
234 {
235         int i;
236         
237         srand(getpid());
238         for(i=0;i<giRich;i++)        vGenFood(i);
239 }
240         
241 int iIsValid(int x,int y)
242 {
243         struct stNode *pstNode;
244 
245         if(x<=WIN_X1 || x>=WIN_X2 || y<=WIN_Y1 || y>=WIN_Y2)
246                 return(0);
247         pstNode=gpstTail;
248         for(;pstNode!=NULL;)
249         {
250                 if(x==pstNode->x && y==pstNode->y)
251                         return(0);
252                 pstNode=pstNode->next;
253         }
254         return(1);
255 }
256 
257 int iEat(int x,int y)
258 {
259         int i,j;
260         
261         for(i=0;i<giRich;i++)
262         {
263                 if(x==gastFood[i].x && y==gastFood[i].y)
264                 {
265                         vGenFood(i);
266                         giScore+=giLevel*10;
267                         giLen++;
268                         if(giLevel<MAX_LEVEL)
269                                 if(giLen%DEVRATE==0)
270                                         giLevel++;
271                         return(1);
272                 }
273         }
274         return(0);
275 }
276 main()
277 {
278         int iDir=2,iNextX,iNextY;
279         struct stNode *pstNew;
280         char sPrompt[80];
281         
282         vInitScreen();
283         vDrawScope();
284         vCreateSnake();
285         vInitFood();
286         for(;;)
287         {
288                 iDir=iGetDir(iDir);
289                 iNextX=gpstHead->x+(iDir>>1)*(5-(iDir<<1));
290                 iNextY=gpstHead->y-(!(iDir>>1))*(1-(iDir<<1));
291                 if(!iIsValid(iNextX,iNextY))
292                 {
293                         printf("\033[%d;%dH\033[1m\033[40;34m%s\033[0m",
294                                 WIN_Y2-1,(WIN_X1+WIN_X2)/2-strlen(OVER)/2,OVER);
295                         break;
296                 }
297                 pstNew=(struct stNode*)malloc(sizeof(struct stNode));
298                 pstNew->x=iNextX;
299                 pstNew->y=iNextY;
300                 pstNew->shape=SNAKE_SHAPE;
301                 pstNew->next=NULL;
302                 gpstHead->next=pstNew;
303                 gpstHead=pstNew;
304                 vDrawOneNode(gpstHead,1);
305                 if(!iEat(iNextX,iNextY))
306                 {
307                         vDrawOneNode(gpstHead,1);
308                         vDrawOneNode(gpstTail,0);
309                         pstNew=gpstTail;
310                         gpstTail=pstNew->next;
311                         free(pstNew);
312                 }
313                 sprintf(sPrompt,"Score:%7d Level:%2d",giScore,giLevel);
314                 printf("\033[%d;%dH\033[1m\033[40;34m%s\033[0m",
315                         WIN_Y2,(WIN_X1+WIN_X2)/2-strlen(sPrompt)/2,sPrompt);
316         }
317         vKillSnake();
318         vRestoreScreen();
319 }