C++ program to display a clock

/*
 C/C++ code to display a clock on the DOS prompt
 Sandipan Dey
 BCSE, JU, Kolkata
 2002
*/

#include <graphics.h>
#include <stdlib.h>
#include <stdio.h>
#include <conio.h>
#include <math.h>
#include <dos.h>
#define PI 3.14159

char* Roman(int r) {
    switch(r) {
        case 0:return "XII";break;
        case 1:return "I";break;
        case 2:return "II";break;
        case 3:return "III";break;
        case 4:return "IV";break;
        case 5:return "V";break;
        case 6:return "VI";break;
        case 7:return "VII";break;
        case 8:return "VIII";break;
        case 9:return "IX";break;
        case 10:return "X";break;
        case 11:return "XI";break;
    }
    return "\0";
}

class Clock {
    int Cx,Cy,Hx,Hy,Mx,My,Sx,Sy;
    struct time t;
    char S[40];
    public:
    Clock();
    Clock(int h,int m,int s);
    void Draw(int=0);
    void DrawCenter();
    void SetHourArm();
    void SetMinArm();
    void SetSecArm();
    void Name();
    void SetTime();
    void Digital();
    void Time();
};

Clock::Clock() {
    Cx=300;
    Cy=200;
    settextstyle(DEFAULT_FONT,HORIZ_DIR,0);
    Draw();
    DrawCenter();
    Time();
    setcolor(getmaxcolor());
}

Clock::Clock(int h,int m,int s) {
    t.ti_hour=h;
    t.ti_min=m;
    t.ti_sec=s;
}

void Clock::Draw(int t) {
    setcolor(12);
    for(int r=150;r<155;++r)
        circle(Cx,Cy,r);
    setcolor(14);
    circle(Cx,Cy,149);
    setcolor(1);
    for(r=165;r<170;++r)
        circle(Cx,Cy,r);
    setcolor(1);
    setcolor(getmaxcolor());
    circle(Cx,Cy,171);
    if(t==0) {
        char s[3];
        for(r=0;r<12;++r){
            (r==0)?sprintf(s,"%d",12):sprintf(s,"%d",r);
            outtextxy(Cx+140*sin(PI-PI*30*r/180),Cy+140*cos(PI-PI*30*r/180),s);
        }
    }
    else
        for(r=0;r<12;++r)
            outtextxy(Cx+140*sin(PI-PI*30*r/180),Cy+140*cos(PI-PI*30*r/180),Roman(r));
    setcolor(getmaxcolor());
}

void Clock::SetHourArm() {
    setcolor(7);
    Hx=Cx+90*sin(PI-PI*(30*(t.ti_hour%12)+(t.ti_min/2))/180);
    Hy=Cy+90*cos(PI-PI*(30*(t.ti_hour%12)+(t.ti_min/2))/180);
    line(Cx-2,Cy,Hx-2,Hy+3);
    line(Cx-1,Cy,Hx-1,Hy+1);
    line(Cx,Cy,Hx,Hy);
    line(Cx+1,Cy,Hx+1,Hy+1);
    line(Cx+2,Cy,Hx+2,Hy+3);
}

void Clock::SetMinArm() {
    setcolor(10);
    Mx=Cx+115*sin(PI-PI*(6*t.ti_min+(t.ti_sec/10))/180);
    My=Cy+115*cos(PI-PI*(6*t.ti_min+(t.ti_sec/10))/180);
    for(int i=-1;i<=1;++i)
    line(Cx+i,Cy,Mx+i,My);
}

void Clock::SetSecArm() {
    setcolor(9);
    Sx=Cx+125*sin(PI-PI*(6*t.ti_sec)/180);
    Sy=Cy+125*cos(PI-PI*(6*t.ti_sec)/180);
    for(int i=-1;i<=1;++i)
    line(Cx+i,Cy,Sx+i,Sy);
    sound(200);
    Name();
    delay(10);
    nosound();
}

void Clock::SetTime() {
    setcolor(0);
    for(int i=-2;i<=2;++i)
    line(Cx+i,Cy,Hx+i,Hy);
    for(i=-1;i<=2;++i)
    line(Cx+i,Cy,Mx+i,My);
    for(i=-1;i<=1;++i)
    line(Cx+i,Cy,Sx+i,Sy);
    outtextxy(225,425,S);
    //DrawCenter();
    setcolor(getmaxcolor());
    //t.ti_hour=h;
    //t.ti_min=m;
    //t.ti_sec=s;
    SetHourArm();
    SetMinArm();
    SetSecArm();
}

void Clock::Name() {
    settextstyle(DEFAULT_FONT,HORIZ_DIR,1);
    rectangle(515,375,630,465);
    outtextxy(520,380,"SANDIPAN DEY");
    outtextxy(520,390,"BCSE-IV");
    outtextxy(520,400,"Roll-99710");
    line(515,412,630,412);
    outtextxy(520,415,"Press Keys:");
    line(515,425,630,425);
    outtextxy(520,432,"C-Change Time");
    outtextxy(520,442,"R-Roman");
    outtextxy(520,452,"X-Exit");
}

void Clock::DrawCenter() {
    setcolor(8);
    putpixel(Cx,Cy,8);
    for(int r=0;r<5;++r)
    circle(Cx,Cy,r);
    setcolor(getmaxcolor());
}

void Clock::Digital() {
    char* AMPM=(char*)malloc(5);
    setcolor(12);
    rectangle(210,415,440,455);
    setcolor(13);
    rectangle(215,420,435,450);
    if(t.ti_hour>=12 && t.ti_hour<=23){
        if(t.ti_hour>12)t.ti_hour=t.ti_hour%12;AMPM="PM";
    }
    else {
        if(t.ti_hour==0)t.ti_hour=12;
        AMPM="AM";
    }
    sprintf(S,"%d: %d: %d %s",t.ti_hour,t.ti_min,t.ti_sec,AMPM);
    setcolor(14);
    settextstyle(DEFAULT_FONT,HORIZ_DIR,2);
    //outtextxy(100,10,"Press C to Change Time");
    outtextxy(225,425,S);
}

void Clock::Time() {
    gettime(&t);
    char c;
    int chk;
    do {
        while(!kbhit()) {
            chk=0;
            SetTime();
            //SetHourArm();
            //SetMinArm();
            //SetSecArm();
            DrawCenter();
            Digital();
            delay(980);
            t.ti_sec=t.ti_sec+1;
            if(t.ti_sec==60){t.ti_min=t.ti_min+1;t.ti_sec=0;chk=1;}
            if(t.ti_min==60){t.ti_hour=t.ti_hour+1;t.ti_min=0;chk=1;}
            if(!chk)delay(4);
        }
        c=getch();
        if(c=='c' || c=='C') {
            int h,m,s;
            outtextxy(500,300,"New Time (hh:mm:ss):" );
            outtextxy(500,320,"hh:");
            fflush(stdin);
            gotoxy(70,21);
            scanf("%d",&h);
            outtextxy(500,335,"mm:");
            gotoxy(70,22);
            scanf("%d",&m);
            outtextxy(500,350,"ss:");
            gotoxy(70,23);
            scanf("%d",&s);
            if((h>0 && h<=12) && (m>=0 && m<60) && (s>=0 && s<60)) {
                t.ti_hour=h;
                t.ti_min=m;
                t.ti_sec=s;
                cleardevice();
                settextstyle(DEFAULT_FONT,HORIZ_DIR,1);
                Draw();
            }
            else {
                outtextxy(500,370,"Error!");
                getch();
                setfillstyle(SOLID_FILL,0);
                bar(500,300,650,400);
            }
        }
        else if(c=='r' || c=='R') {
            setcolor(15);
            settextstyle(DEFAULT_FONT,HORIZ_DIR,1);
            cleardevice();
            Draw(1);
        }
        else if(c=='n' || c=='N') {
            setcolor(15);
            settextstyle(DEFAULT_FONT,HORIZ_DIR,1);
            cleardevice();
            Draw();
        }
        fflush(stdin);
    } while(c!='x' && c!='X');
    //{int h,m,s;cleardevice();outtextxy(100,100,"Enter New Time:");moveto(400,100);scanf("%d%d%d",&h,&m,&s);t.ti_hour=(unsigned char)h;t.ti_min=(unsigned char)m;t.ti_sec=(unsigned char)s;cleardevice();Clock(1);}
}

void main(void) {
   int gd=DETECT,gm;
   initgraph(&gd,&gm,"");
   Clock c;
   //getch();
   closegraph();
}