Build an analog clock

Question

Write a program which displays the current system time as an analog clock, using ASCII graphics. The clock must show at least the hour and minute pointers, and must have enough resolution of at least 5 minutes.

The display can be as small and as ugly as you wish, but the shown time should be easily recognizable.

The program has to run continuously and update its status. If your system can clear the screen, use it, otherwise it's enough to repaint the clock when its state changes.

You get a -20% bonus on the character count if the clock has at least a 1 minute resolution.

Answer 1

Mathematica 213 - 42 = 171

The ticks and hour labels are placed on the unit circle. H and M revolve around the clock center showing the whole number of completed hours and minutes, respectively. S updates its position several times each second.

Two versions are shown: a version that plots text in the Cartesian plane, and another that displays text characters in a grid.

This version plots the characters into the Cartesian plane.

d = Dynamic; t = Table; x = Text;i_~u~k_ := {Sin[2 \[Pi] i/k], Cos[2 \[Pi] i/k]};
d[{f = Date[], Clock[{1, 1}, 1]}]
Graphics[d@{t[x[".", u[i, 60]], {i, 60}],t[x[i, u[i, 12]], {i, 12}],
x["H", .7 u[f[[4]], 12]],x["M", .8 u[f[[5]], 60]],x["S", .9 u[f[[6]], 60]]}]

The clock below shows the time 3:08:17.

Terminal or Grid Version: 430 316 chars (253 with bonus discount)

This version works much the same, but places the characters in a 61 x 61 cell grid rather than in the Cartesian plane. It could still be golfed a bit, but I merely wanted to show a (sloppier) terminal-like output in Mathematica.

d = Dynamic; i_~u~k_ := Round /@ (10 {Sin[2 \[Pi] (i + 3 k/4)/k], 
Cos[2 \[Pi] (i + 3 k/4)/k]}); d[{f = Date[], Clock[]}]
z = Round /@ (# u[f[[#2]], #3] + 11) -> #4 &;
t = Table[( u[i, 12] + 11) -> i, {i, 12}];
d@Grid[ReplacePart[ConstantArray["", {21, 21}],
Join[z @@@ {{.9, 5, 60, "M"}, {.8, 4, 12, "H"}},
DeleteCases[Table[( u[i, 60] + 11) -> "*", {i, 60}], x_ /; MemberQ[t[[All, 1]], x[[1]]]], t]]]

The clock below displays 11:06.

Answer 2

Python, 328 - 65 = 263

Prints a new clock every second, with the minute hand updating every minute.

import math,time
def p(t,r):c[int(25-r*math.cos(t))][int(25+r*math.sin(t))]='*'
while 1:
 time.sleep(1);c=[[' ']*50 for i in range(50)];t=time.localtime();h=t.tm_hour*6.283+t.tm_min/9.549
 for i in range(999):
    p(i/158.0,24);p(h,i*.02);p(h/12,i*.01)
    for q in range(12):p(q/1.91,24-i*.005)
 for y in range(50):print''.join(c[y])

The clocks it prints look like this (it's not as stretched in my terminal):

                  **************                  
               ****      *     ****               
             ***         *        ***             
           ***           *          ***           
          ** **          *         ** **          
         **   *                    *   **         
        **    **                  **    **        
       *       *                  *      **       
      **                                  **      
     **                                    **     
    **                                      **    
    *                                        *    
   ***                                      ***   
   * ***                                  *** *   
  **   **                                **   **  
  *                                            *  
  *                                            *  
 **                                            ** 
 *                                              * 
 *   *                                          * 
 *   ******                                     * 
 *        ******                                * 
 *             ******                           * 
 *                  *****                       * 
 *****                   *                  ******
 *                       **                     * 
 *                        **                    * 
 *                         *                    * 
 *                         **                   * 
 *                          **                  * 
 **                          **                ** 
  *                           *                *  
  *                           *                *  
  **   **                                **   **  
   * ***                                  *** *   
   ***                                      ***   
    *                                        *    
    **                                      **    
     **                                    **     
      **                                  **      
       *       *                  *       *       
        **    **                  **    **        
         **   *                    *   **         
          ** **          *         ** **          
           ***           *          ***           
             ***         *        ***             
               ****      *     ****               
                  **************                  
                         *                        

Answer 3

Javascript 370 - 74 = 296

http://jsfiddle.net/wBKQ6/7/

(function loop(){
    M=Math;p=M.PI/2;z=M.pow;q=M.sqrt;d=new Date();h=(d.getHours()%12/3*p+p)%(p*4);m=(d.getMinutes()/15*p+p)%(p*4);s=(d.getSeconds()/15*p+p)%(p*4);e=49;o='';

    for(r=0;r<99;r++){
        for(c=0;c<99;c++){           
            d=q(z(r-e,2)+z(c-e,2));
            a=(M.atan2(e-r,e-c)+p*4)%(p*4);
            E=(d<e*.8&&M.abs(m-a)*d<.5) || (d<e*.5&&M.abs(h-a)*d<.5) || (d<e*1&&M.abs(s-a)*d<.5);
            o+=d-e>0||d<1||E||(e-d<5&&a%p==0)?'●':'○';
            //■□●○
        }
        o+='\n';
    }
    O.innerText=o
    setTimeout(loop,1000);
})()

Golfed (370):

!function L(){p=M.PI/2;q=p*4;P=M.pow;d=new Date();s=(d.getSeconds(S=d.getMinutes(e=40))/15*p+p)%q;m=(S/15*p+p)%q;h=(d.getHours(A=M.abs)%12/3*p+S/180*p+p)%q;for(r=o='';r<81;r++,o+='\n')for(c=0;c<81;){d=M.sqrt(P(r-e,2)+P(c-e,2));a=(M.atan2(e-r,e-c++)+q)%q;o+='○●'[d-e>0|d<e*.8&A(m-a)*d<1|d<e/2&A(h-a)*d<1|d<e&A(s-a)*d<1|e-d<5&a%p==0]}O.innerText=o;setTimeout(L,9)}(M=Math)

Sample Output (much more condensed in demo):

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Answer 4

Python 2 - 207

import time as T
while 1:t=T.localtime();m=t.tm_min/5;l=[12]+range(1,12);l[m]='';l[t.tm_hour%12]='H';l[m]+='M';a='  %s\n';print(a+('%s'+a)*5+a)%tuple(str(l[x])for x in[0,11,1,10,2,9,3,8,4,7,5,6]);T.sleep(9)

It is very ugly, but readable. Prints every 9 sec (you can change to 1 sec if you prefer), updates every 5 min. I don't have much experience with code golfing in python so I expect it can be improved.

Example output:

  12
11  1
10  2
9  M
8  4
7  H
  6