C語言定時器的使用 計算質點運動的位移

用C語言編一個質點運動的程序，知道起始點坐標(x1,y1)和終止點坐標(x2,y2)，速度v和加速度a也知道，現在就想通過計算每隔一個時間t(假設10毫秒)質點的位移而得知質點所在的坐標(x,y)。

應該是要用定時器吧，但是我不會用，網上一查定時器都是單片機的定時器，但我不用單片器，只是單純的計算。。有沒有大神可以幫我編寫這一段程序，萬分感謝

------解決思路----------------------

你可以使用?alarm()??ualarm()??的信號機制。?在SIGALRM?信號捕捉函數中處理你的邏輯

------解決思路----------------------

為什么不用

BOOL?LineDDA(

int?nXStart,?????????????//?x-coordinate?of?line's?starting?point

int?nYStart,?????????????//?y-coordinate?of?line's?starting?point

int?nXEnd,???????????????//?x-coordinate?of?line's?ending?point

int?nYEnd,???????????????//?y-coordinate?of?line's?ending?point

LINEDDAPROC?lpLineFunc,??//?pointer?to?callback?function

LPARAM?lpData????????????//?pointer?to?application-defined?data

);

呢？

------解決思路----------------------

參考下面：#pragma?comment(lib,"user32")

#include?

#include?

#include?

#include?

char?datestr[16];

char?timestr[16];

char?mss[4];

void?log(char?*s)?{

struct?tm?*now;

struct?timeb?tb;

ftime(&tb);

now=localtime(&tb.time);

sprintf(datestr,"%04d-%02d-%02d",now->tm_year+1900,now->tm_mon+1,now->tm_mday);

sprintf(timestr,"%02d:%02d:%02d",now->tm_hour?????,now->tm_min??,now->tm_sec?);

sprintf(mss,"%03d",tb.millitm);

printf("%s?%s.%s?%s",datestr,timestr,mss,s);

}

VOID?CALLBACK?myTimerProc1(

HWND?hwnd,?//?handle?of?window?for?timer?messages

UINT?uMsg,?//?WM_TIMER?message

UINT?idEvent,?//?timer?identifier

DWORD?dwTime?//?current?system?time

)?{

log("In?myTimerProc1\n");

}

VOID?CALLBACK?myTimerProc2(

HWND?hwnd,?//?handle?of?window?for?timer?messages

UINT?uMsg,?//?WM_TIMER?message

UINT?idEvent,?//?timer?identifier

DWORD?dwTime?//?current?system?time

)?{

log("In?myTimerProc2\n");

}

int?main()?{

int?i;

MSG?msg;

SetTimer(NULL,0,1000,myTimerProc1);

SetTimer(NULL,0,2000,myTimerProc2);

for?(i=0;i<20;i++)?{

Sleep(500);

log("In?main\n");

if?(GetMessage(&msg,NULL,0,0))?{

TranslateMessage(&msg);

DispatchMessage(&msg);

}

}

return?0;

}

//2012-07-26?17:29:06.375?In?main

//2012-07-26?17:29:06.875?In?myTimerProc1

//2012-07-26?17:29:07.375?In?main

//2012-07-26?17:29:07.875?In?myTimerProc2

//2012-07-26?17:29:08.375?In?main

//2012-07-26?17:29:08.375?In?myTimerProc1

//2012-07-26?17:29:08.875?In?main

//2012-07-26?17:29:08.875?In?myTimerProc1

//2012-07-26?17:29:09.375?In?main

//2012-07-26?17:29:09.890?In?myTimerProc2

//2012-07-26?17:29:10.390?In?main

//2012-07-26?17:29:10.390?In?myTimerProc1

//2012-07-26?17:29:10.890?In?main

//2012-07-26?17:29:10.890?In?myTimerProc1

//2012-07-26?17:29:11.390?In?main

//2012-07-26?17:29:11.890?In?myTimerProc2

//2012-07-26?17:29:12.390?In?main

//2012-07-26?17:29:12.390?In?myTimerProc1

//2012-07-26?17:29:12.890?In?main

//2012-07-26?17:29:12.890?In?myTimerProc1

//2012-07-26?17:29:13.390?In?main

//2012-07-26?17:29:13.890?In?myTimerProc2

//2012-07-26?17:29:14.390?In?main

//2012-07-26?17:29:14.390?In?myTimerProc1

//2012-07-26?17:29:14.890?In?main

//2012-07-26?17:29:14.890?In?myTimerProc1

//2012-07-26?17:29:15.390?In?main

//2012-07-26?17:29:15.890?In?myTimerProc2

//2012-07-26?17:29:16.390?In?main

//2012-07-26?17:29:16.390?In?myTimerProc1

//2012-07-26?17:29:16.890?In?main

//2012-07-26?17:29:16.890?In?myTimerProc1

//2012-07-26?17:29:17.390?In?main

//2012-07-26?17:29:17.890?In?myTimerProc2

//2012-07-26?17:29:18.390?In?main

//2012-07-26?17:29:18.390?In?myTimerProc1

//2012-07-26?17:29:18.890?In?main

//2012-07-26?17:29:18.890?In?myTimerProc1

//2012-07-26?17:29:19.390?In?main

//2012-07-26?17:29:19.890?In?myTimerProc2

和下面：#include?

#include?

#include?

#ifdef?WIN32

#include?

#include?

#include?

#define??MYVOID?????????????void

#else

#include?

#include?

#include?

#define??CRITICAL_SECTION???pthread_mutex_t

#define??_vsnprintf?????????vsnprintf

#define??MYVOID?????????????void?*

#endif

//Log{

#define?MAXLOGSIZE?20000000

#define?ARRSIZE(x)?(sizeof(x)/sizeof(x[0]))

#include?

#include?

#include?

char?logfilename1[]="MyLog1.log";

char?logfilename2[]="MyLog2.log";

char?logstr[16000];

char?datestr[16];

char?timestr[16];

char?mss[4];

CRITICAL_SECTION?cs_log;

FILE?*flog;

#ifdef?WIN32

void?Lock(CRITICAL_SECTION?*l)?{

EnterCriticalSection(l);

}

void?Unlock(CRITICAL_SECTION?*l)?{

LeaveCriticalSection(l);

}

void?sleep_ms(int?ms)?{

Sleep(ms);

}

#else

void?Lock(CRITICAL_SECTION?*l)?{

pthread_mutex_lock(l);

}

void?Unlock(CRITICAL_SECTION?*l)?{

pthread_mutex_unlock(l);

}

void?sleep_ms(int?ms)?{

usleep(ms*1000);

}

#endif

void?LogV(const?char?*pszFmt,va_list?argp)?{

struct?tm?*now;

struct?timeb?tb;

if?(NULL==pszFmt

------解決思路----------------------

0==pszFmt[0])?return;

if?(-1==_vsnprintf(logstr,ARRSIZE(logstr),pszFmt,argp))?logstr[ARRSIZE(logstr)-1]=0;

ftime(&tb);

now=localtime(&tb.time);

sprintf(datestr,"%04d-%02d-%02d",now->tm_year+1900,now->tm_mon+1,now->tm_mday);

sprintf(timestr,"%02d:%02d:%02d",now->tm_hour?????,now->tm_min??,now->tm_sec?);

sprintf(mss,"%03d",tb.millitm);

printf("%s?%s.%s?%s",datestr,timestr,mss,logstr);

flog=fopen(logfilename1,"a");

if?(NULL!=flog)?{

fprintf(flog,"%s?%s.%s?%s",datestr,timestr,mss,logstr);

if?(ftell(flog)>MAXLOGSIZE)?{

fclose(flog);

if?(rename(logfilename1,logfilename2))?{

remove(logfilename2);

rename(logfilename1,logfilename2);

}

flog=fopen(logfilename1,"a");

if?(NULL==flog)?return;

}

fclose(flog);

}

}

void?Log(const?char?*pszFmt,...)?{

va_list?argp;

Lock(&cs_log);

va_start(argp,pszFmt);

LogV(pszFmt,argp);

va_end(argp);

Unlock(&cs_log);

}

//Log}

int?No_Loop=0;

MYVOID?testThread(void?*pcn)?{

int?n,i;

n=(int)pcn;

i=0;

while?(1)?{

sleep_ms(1000);

Log("in?testThread?%d:i==%ds\n",n,++i);

if?(i>=5)?No_Loop=1;

}

}

int?main(int?argc,char?*?argv[])?{

int?i;

#ifdef?WIN32

InitializeCriticalSection(&cs_log);

#else

pthread_mutex_init(&cs_log,NULL);

pthread_t?threads[1];

int?threadsN;

int?rc;

#endif

Log("=========BEGIN==================\n");

#ifdef?WIN32

_beginthread((void(__cdecl?*)(void?*))testThread,0,(void?*)1);

#else

threadsN=0;

rc=pthread_create(&(threads[threadsN++]),NULL,testThread,(void?*)1);if?(rc)?Log("%d=pthread_create?%d?error!\n",rc,threadsN-1);

#endif

i=0;

while?(1)?{

sleep_ms(100);

Log("in?main:i==%d\n",++i);

if?(No_Loop==1)?break;//

}

Log("=========END====================\n");

#ifdef?WIN32

DeleteCriticalSection(&cs_log);

#else

pthread_mutex_destroy(&cs_log);

#endif

return?0;

}

//2012-06-14?16:27:21.500?=========BEGIN==================

//2012-06-14?16:27:21.609?in?main:i==1

//2012-06-14?16:27:21.718?in?main:i==2

//2012-06-14?16:27:21.828?in?main:i==3

//2012-06-14?16:27:21.937?in?main:i==4

//2012-06-14?16:27:22.046?in?main:i==5

//2012-06-14?16:27:22.156?in?main:i==6

//2012-06-14?16:27:22.265?in?main:i==7

//2012-06-14?16:27:22.375?in?main:i==8

//2012-06-14?16:27:22.484?in?main:i==9

//2012-06-14?16:27:22.500?in?testThread?1:i==1s

//2012-06-14?16:27:22.593?in?main:i==10

//2012-06-14?16:27:22.703?in?main:i==11

//2012-06-14?16:27:22.812?in?main:i==12

//2012-06-14?16:27:22.921?in?main:i==13

//2012-06-14?16:27:23.031?in?main:i==14

//2012-06-14?16:27:23.140?in?main:i==15

//2012-06-14?16:27:23.250?in?main:i==16

//2012-06-14?16:27:23.359?in?main:i==17

//2012-06-14?16:27:23.468?in?main:i==18

//2012-06-14?16:27:23.500?in?testThread?1:i==2s

//2012-06-14?16:27:23.578?in?main:i==19

//2012-06-14?16:27:23.687?in?main:i==20

//2012-06-14?16:27:23.796?in?main:i==21

//2012-06-14?16:27:23.906?in?main:i==22

//2012-06-14?16:27:24.015?in?main:i==23

//2012-06-14?16:27:24.125?in?main:i==24

//2012-06-14?16:27:24.234?in?main:i==25

//2012-06-14?16:27:24.343?in?main:i==26

//2012-06-14?16:27:24.453?in?main:i==27

//2012-06-14?16:27:24.500?in?testThread?1:i==3s

//2012-06-14?16:27:24.562?in?main:i==28

//2012-06-14?16:27:24.671?in?main:i==29

//2012-06-14?16:27:24.781?in?main:i==30

//2012-06-14?16:27:24.890?in?main:i==31

//2012-06-14?16:27:25.000?in?main:i==32

//2012-06-14?16:27:25.109?in?main:i==33

//2012-06-14?16:27:25.218?in?main:i==34

//2012-06-14?16:27:25.328?in?main:i==35

//2012-06-14?16:27:25.437?in?main:i==36

//2012-06-14?16:27:25.500?in?testThread?1:i==4s

//2012-06-14?16:27:25.546?in?main:i==37

//2012-06-14?16:27:25.656?in?main:i==38

//2012-06-14?16:27:25.765?in?main:i==39

//2012-06-14?16:27:25.875?in?main:i==40

//2012-06-14?16:27:25.984?in?main:i==41

//2012-06-14?16:27:26.093?in?main:i==42

//2012-06-14?16:27:26.203?in?main:i==43

//2012-06-14?16:27:26.312?in?main:i==44

//2012-06-14?16:27:26.421?in?main:i==45

//2012-06-14?16:27:26.500?in?testThread?1:i==5s

//2012-06-14?16:27:26.531?in?main:i==46

//2012-06-14?16:27:26.531?=========END====================

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