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1#!/usr/bin/env python
2#
3# $Id$
4#
5# From tclock.c, Copyright Howard Jones <ha.jones@ic.ac.uk>, September 1994.
6
7from math import *
8import curses, time
9
10ASPECT = 2.2
11
12def sign(_x):
13    if _x < 0: return -1
14    return 1
15
16def A2XY(angle, radius):
17    return (int(round(ASPECT * radius * sin(angle))),
18            int(round(radius * cos(angle))))
19
20def plot(x, y, col):
21    stdscr.addch(y, x, col)
22
23# draw a diagonal line using Bresenham's algorithm
24def dline(pair, from_x, from_y, x2, y2, ch):
25    if curses.has_colors():
26        stdscr.attrset(curses.color_pair(pair))
27
28    dx = x2 - from_x
29    dy = y2 - from_y
30
31    ax = abs(dx * 2)
32    ay = abs(dy * 2)
33
34    sx = sign(dx)
35    sy = sign(dy)
36
37    x = from_x
38    y = from_y
39
40    if ax > ay:
41        d = ay - ax // 2
42
43        while True:
44            plot(x, y, ch)
45            if x == x2:
46                return
47
48            if d >= 0:
49                y += sy
50                d -= ax
51            x += sx
52            d += ay
53    else:
54        d = ax - ay // 2
55
56        while True:
57            plot(x, y, ch)
58            if y == y2:
59                return
60
61            if d >= 0:
62                x += sx
63                d -= ay
64            y += sy
65            d += ax
66
67def main(win):
68    global stdscr
69    stdscr = win
70
71    lastbeep = -1
72    my_bg = curses.COLOR_BLACK
73
74    stdscr.nodelay(1)
75    stdscr.timeout(0)
76#    curses.curs_set(0)
77    if curses.has_colors():
78        curses.init_pair(1, curses.COLOR_RED, my_bg)
79        curses.init_pair(2, curses.COLOR_MAGENTA, my_bg)
80        curses.init_pair(3, curses.COLOR_GREEN, my_bg)
81
82    cx = (curses.COLS - 1) // 2
83    cy = curses.LINES // 2
84    ch = min( cy-1, int(cx // ASPECT) - 1)
85    mradius = (3 * ch) // 4
86    hradius = ch // 2
87    sradius = 5 * ch // 6
88
89    for i in range(0, 12):
90        sangle = (i + 1) * 2.0 * pi / 12.0
91        sdx, sdy = A2XY(sangle, sradius)
92
93        stdscr.addstr(cy - sdy, cx + sdx, "%d" % (i + 1))
94
95    stdscr.addstr(0, 0,
96                  "ASCII Clock by Howard Jones <ha.jones@ic.ac.uk>, 1994")
97
98    sradius = max(sradius-4, 8)
99
100    while True:
101        curses.napms(1000)
102
103        tim = time.time()
104        t = time.localtime(tim)
105
106        hours = t[3] + t[4] / 60.0
107        if hours > 12.0:
108            hours -= 12.0
109
110        mangle = t[4] * 2 * pi / 60.0
111        mdx, mdy = A2XY(mangle, mradius)
112
113        hangle = hours * 2 * pi / 12.0
114        hdx, hdy = A2XY(hangle, hradius)
115
116        sangle = t[5] * 2 * pi / 60.0
117        sdx, sdy = A2XY(sangle, sradius)
118
119        dline(3, cx, cy, cx + mdx, cy - mdy, ord('#'))
120
121        stdscr.attrset(curses.A_REVERSE)
122        dline(2, cx, cy, cx + hdx, cy - hdy, ord('.'))
123        stdscr.attroff(curses.A_REVERSE)
124
125        if curses.has_colors():
126            stdscr.attrset(curses.color_pair(1))
127
128        plot(cx + sdx, cy - sdy, ord('O'))
129
130        if curses.has_colors():
131            stdscr.attrset(curses.color_pair(0))
132
133        stdscr.addstr(curses.LINES - 2, 0, time.ctime(tim))
134        stdscr.refresh()
135        if (t[5] % 5) == 0 and t[5] != lastbeep:
136            lastbeep = t[5]
137            curses.beep()
138
139        ch = stdscr.getch()
140        if ch == ord('q'):
141            return 0
142
143        plot(cx + sdx, cy - sdy, ord(' '))
144        dline(0, cx, cy, cx + hdx, cy - hdy, ord(' '))
145        dline(0, cx, cy, cx + mdx, cy - mdy, ord(' '))
146
147curses.wrapper(main)
148