一个简单易懂的时钟程序

/***********简单的时钟程序，界面不是很美观，您可以根据自己的爱好加以修改，如给表盘加上刻度，将指针改为其它外形等*/

#include<graphics.h>

#include<math.h>

#include<dos.h>

#define PI 3.1415926

#define x0 320 /*定义钟表中心坐标*/

#define y0 240

void DrawClock(int x,int y,int color) /*画表盘*/

{ int r=150; /*表盘的半径*/

float th;

setcolor(color);

circle(x,y,r);

circle(x,y,2);

}

void DrawHand(int x,int y,float th,int l,int color)

{

int x1,y1;

x1=x+l*sin(th);

y1=y-l*cos(th);

setcolor(color);

line(x,y,x1,y1);

}

void main()

{int gdriver=DETECT,gmode;

strUCt time curtime;

float th_hour,th_min,th_sec;

initgraph(&gdriver,&gmode,"");

setbkcolor(0);

while(! kbhit())

{

DrawClock(x0,y0,14);

gettime(&curtime); /*得到当前系统时间*/

gotoxy(35,20); /*定位输出位置*/

if((float)curtime.ti_hour<=12) /*午前的处理*/

{printf("AM ");

if((float)curtime.ti_hour<10) printf("0"); /*十点之前在小时数前加零*/

printf("%.0f:",(float)curtime.ti_hour);

}

else /*午后的处理*/

{printf("PM ");

if((float)curtime.ti_hour-12<10) printf("0");

printf("%.0f:",(float)curtime.ti_hour-12);

}

if((float)curtime.ti_min<10) printf("0");

printf("%.0f:",(float)curtime.ti_min);

if((float)curtime.ti_sec<10) printf("0");

printf("%.0f",(float)curtime.ti_sec);

/*以下三行计算表针转动角度，以竖直向上为起点，顺时针为正*/

th_sec=(float)curtime.ti_sec*0.1047197551; /*2π/60=0.1047197551*/

th_min=(float)curtime.ti_min*0.1047197551+th_sec/60.0;

th_hour=(float)curtime.ti_hour*0.523598775+th_min/12.0; /* 2π/12=0.5235987755 */

DrawHand(x0,y0,th_hour,70,2); /*画时针*/

DrawHand(x0,y0,th_min,110,3); /*分针*/

DrawHand(x0,y0,th_sec,140,12); /*秒针*/

sleep(1); /*延时一秒后刷新*/

cleardevice();

}

closegraph();

}

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