Analog Clock

/*

  * THIS PROGRAM DRAWS A REAL CLOCK WITH HOURS, MINUTES & SECONDS HANDS ROTATING AROUND TO  COUNT EXACT TIME (SYSTEM TIME)

  */

    

#include<stdio.h>

#include<conio.h>

#include<graphics.h>

#include<dos.h>

#include<stdlib.h>

#include<math.h>

void drawclk();

void showtime(int, int, int, int, int, int);

void main(){

  int   driver = DETECT,mode,hh,mm,ss;

  int xcenter,ycenter;

  double xs,ys,xm,ym,xh,yh;

  double xs_old,ys_old,xm_old,ym_old,xh_old,yh_old;

  struct time t;

 

  initgraph(&driver,&mode,"c:\\tc\\bgi");

            gettime(&t);

            hh=t.ti_hour;

            mm=t.ti_min;

            ss=t.ti_sec;

            if(hh>12)

                        hh=hh-12;

  cleardevice();

 

  //Other end point of second hand

  xs=(90*cos(M_PI_2-ss*M_PI/30));

  ys=(90*sin(M_PI_2-ss*M_PI/30));

  //Other end point of minute hand

  xm=(70*cos(M_PI_2-mm*M_PI/30));

  ym=(70*sin(M_PI_2-mm*M_PI/30));

  //Other end point of hour hand

  xh=(40*cos(M_PI_2-hh*M_PI/6));

  yh=(40*sin(M_PI_2-hh*M_PI/6));

  //Transformation matrix of second hand's end point

  double Ts[2][2]={1,sin(-M_PI/30),-sin(-M_PI/30),1-sin((M_PI/30)*(M_PI/30))};

  //Transformation matrix of minute hand's end point

  double Tm[2][2]={1,sin(-M_PI/30/60),-sin(-M_PI/30/60),1-sin((M_PI/30/60)*(M_PI/30/60))};

  //Transformation matrix of second hand's end point

  double Th[2][2]={1,sin(-M_PI/30/60/12),-sin(-M_PI/30/60/12),1-sin((M_PI/30/60/12)*(M_PI/30/60/12))};

  //Drawing the clock with initial time

      showtime(xs,ys,xm,ym,xh,yh);

  int c;

  for(;;)

  {

   cleardevice();

   xs_old = xs;    ys_old = ys;

  xm_old = xm; ym_old = ym;

  xh_old = xh;   yh_old = yh;

    //Transforming end point of second's hand

    xs=xs_old*Ts[0][0]+ys_old*Ts[1][0];

    ys=xs_old*Ts[0][1]+ys_old*Ts[1][1];

    //Transforming end point of minute's hand

    xm=xm_old*Tm[0][0]+ym_old*Tm[1][0];

    ym=xm_old*Tm[0][1]+ym_old*Tm[1][1];

    //Transforming end point of hour's hand

    xh=xh_old*Th[0][0]+yh_old*Th[1][0];

    yh=xh_old*Th[0][1]+yh_old*Th[1][1];

    //Drawing the clock again

    showtime(xs,ys,xm,ym,xh,yh);

           

            if(kbhit()){

    c = getch();

     if(c == 'q')               /* ‘q’ -> to quit */

            exit(1);

     }

  }

  closegraph();

}

void drawclk()

{

            int i,j,X,Y,R=150,r=3;

            float t;

            X=getmaxx()/2;

            Y=getmaxy()/2;

            setcolor(YELLOW);

            fillellipse(X,Y,R,R);

            setcolor(MAGENTA);

            outtextxy(X-10,Y-80,"TITAN");

            setcolor(RED);

            circle(X,Y,R);

            circle(X,Y,r);

            for(i=0;i<360;i+=30)

            {

                        t=3.14/180*i;

                        moveto(X+(R-5)*cos(t),Y-(R-5)*sin(t));

                        lineto(X+(R-15)*cos(t),Y-(R-15)*sin(t));

            }

            for(i=0;i<360;i+=6){

                        t=3.14/180*i;

                        putpixel(X+(R-10)*cos(t),Y-(R-10)*sin(t),RED);

            }

}

void showtime(int xs, int ys,int xm, int ym, int xh, int yh)

{

 int xcenter = getmaxx()/2;

 int ycenter = getmaxy()/2;

  drawclk();

  setlinestyle(SOLID_LINE,1,1);

  setcolor(CYAN);

  line(xcenter,ycenter,xcenter+(int)xs,ycenter-(int)ys);  // drawing second’s hand

  setlinestyle(SOLID_LINE,1,1);

  setcolor(GREEN);

  line(xcenter,ycenter,xcenter+(int)xm,ycenter-(int)ym);          // drawing minute’s hand

  setlinestyle(SOLID_LINE,1,1);

  setcolor(DARKGRAY);

  line(xcenter,ycenter,xcenter+(int)xh,ycenter-(int)yh);             // drawing hour’s hand

  delay(1000);

}