/*
 * aclock - ascii clock for UNIX Console
 *
 * Copyright (c) 2002 Antoni Sawicki <as@tenoware.com>
 * Version 2.3 (unix-curses); Mountain View, July 2013
 *
 * Compilation: cc aclock-unix-curses.c -o aclock -lcurses -lm
 *
 */

#include <unistd.h>
#include <curses.h>
#include <math.h>
#include <time.h>

#ifndef M_PI
#define M_PI 3.14159265358979323846
#endif

#define FontWH_Ratio 2  

void draw_circle(int hand_max, int sYcen, int sXcen){
    int x,y,r;
    char c;

    for(r=0;r<60;r++){
        x=cos(r*M_PI/180*6)*hand_max*FontWH_Ratio+sXcen;
        y=sin(r*M_PI/180*6)*hand_max+sYcen;
        switch (r) {
            case 0:
            case 5:
            case 10:
            case 15:
            case 20:
            case 25:
            case 30:
            case 35:
            case 40:
            case 45:
            case 50:
            case 55:
                c='o';
                break;
            default:
                c='.';
                break;
        }
        mvaddch(y,x,c);
    }
}

void draw_hand(int minute, int hlenght, char c, int sXcen, int sYcen){
    int x,y,n;
    float r=(minute-15)*(M_PI/180)*6;

    for(n=1; n<hlenght; n++){
        x=cos(r)*n*FontWH_Ratio+sXcen;
        y=sin(r)*n+sYcen;
        mvaddch(y,x,c);
    }
}


int main(void){
    char INFO[]="Copyright (c) 1994-2013 Antoni Sawicki <as@tenoware.com>\n"
                "Version 2.3 (unix-curses); Mountain View, July 2013\n";
    char digital_time[15];
    int sXmax, sYmax, smax, hand_max, sXcen, sYcen;
    time_t t;
    struct tm *ltime;

    sXmax=sYmax=hand_max=sXcen=sYcen=0;
    initscr();

    while(1){
        time(&t);
        ltime=localtime(&t);
        sXmax = COLS;
        sYmax = LINES;

        if(sXmax/FontWH_Ratio<=sYmax)
            smax=sXmax/FontWH_Ratio;
        else
            smax=sYmax;

        hand_max = (smax/2)-1;

        sXcen = sXmax/2;
        sYcen = sYmax/2;

        erase();
        draw_circle(hand_max, sYcen, sXcen);

        draw_hand((ltime->tm_hour*5)+(ltime->tm_min/10), 2*hand_max/3, 'h', sXcen, sYcen);
        draw_hand(ltime->tm_min, hand_max-2, 'm', sXcen, sYcen);
        draw_hand(ltime->tm_sec, hand_max-1, '.', sXcen, sYcen);

        mvaddstr(sYcen-(3*hand_max/5), sXcen-5, ".:ACLOCK:.");
        mvprintw(sYcen+(3*hand_max/5), sXcen-5, "[%02d:%02d:%02d]", ltime->tm_hour, ltime->tm_min, ltime->tm_sec);

        refresh();
        sleep(1);
    }
    endwin();
    return 0;
}