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program tclock;
{$MODE OBJFPC}
uses
libc, ncurses, sysutils;
const
ASPECT = 2.2;
_2PI = 2.0 * PI;
function sign(_x: Integer): Integer;
begin
if _x < 0 then
sign := -1
else
sign := 1
end;
function A2X(angle,radius: Double): Integer; inline;
begin
A2X := round(ASPECT * radius * sin(angle))
end;
function A2Y(angle,radius: Double): Integer; inline;
begin
A2Y := round(radius * cos(angle))
end;
type
PRchar = ^TRchar;
TRchar = record
ry,rx: Smallint;
rch: chtype;
end;
procedure restore( rest: PRchar );
var
i: Longint = 0;
begin
while rest[i].rch <> 0 do
begin
with rest[i] do
mvaddch(ry, rx, rch);
Inc(i);
end;
freemem(rest)
end;
(* Draw a diagonal(arbitrary) line using Bresenham's alogrithm. *)
procedure dline(from_y, from_x, end_y, end_x: Smallint; ch: chtype; var rest: PRchar);
var
dx, dy: Smallint;
ax, ay: Smallint;
sx, sy: Smallint;
x, y, d, i: Smallint;
begin
dx := end_x - from_x;
dy := end_y - from_y;
ax := abs(dx * 2);
ay := abs(dy * 2);
sx := sign(dx);
sy := sign(dy);
x := from_x;
y := from_y;
i := 0;
if (ax > ay) then
begin
getmem(rest, sizeof(TRchar)*(abs(dx)+3));
d := ay - (ax DIV 2);
while true do
begin
move(y, x);
with rest[i] do
begin
rch := inch;
ry := y;
rx := x;
Inc(i)
end;
addch(ch);
if (x = end_x) then
begin
rest[i].rch := 0;
exit;
end;
if (d >= 0) then
begin
y += sy;
d -= ax;
end;
x += sx;
d += ay;
end
end
else
begin
getmem(rest, sizeof(TRchar)*(abs(dy)+3));
d := ax - (ay DIV 2);
while true do
begin
move(y, x);
with rest[i] do
begin
rch := inch;
ry := y;
rx := x;
Inc(i)
end;
addch(ch);
if (y = end_y) then
begin
rest[i].rch := 0;
exit;
end;
if (d >= 0) then
begin
x += sx;
d -= ay;
end;
y += sy;
d += ax;
end
end
end;
var
cx, cy: Integer;
cr, sradius, mradius, hradius: Double;
procedure clockinit;
const
title1 = 'Free pascal';
title2 = 'ncurses clock';
title3 = 'Press F10 or q to exit';
var
i: Integer;
vstr, tstr: AnsiString;
angle: Double;
begin
cx := (COLS - 1) DIV 2;
cy := LINES DIV 2;
if (cx / ASPECT < cy) then
cr := cx / ASPECT
else
cr := cy;
sradius := (8 * cr) / 9;
mradius := (3 * cr) / 4;
hradius := cr / 2;
for i := 1 to 24 do
begin
angle := i * _2PI / 24.0;
if (i MOD 2) = 0 then
begin
Str (i DIV 2, tstr);
attron(A_BOLD OR COLOR_PAIR(5));
mvaddstr(cy - A2Y(angle, sradius), cx + A2X(angle, sradius), @tstr[1]);
attroff(A_BOLD OR COLOR_PAIR(5));
end
else
begin
attron(COLOR_PAIR(1));
mvaddch(cy - A2Y(angle, sradius), cx + A2X(angle, sradius), chtype('.'));
attroff(COLOR_PAIR(1));
end
end;
vstr := curses_version;
attron(A_DIM OR COLOR_PAIR(2));
mvhline(cy , cx - round(sradius * ASPECT) + 1, ACS_HLINE, round(sradius * ASPECT) * 2 - 1);
mvvline(cy - round(sradius) + 1, cx , ACS_VLINE, round(sradius) * 2 - 1);
attroff(A_DIM OR COLOR_PAIR(1));
attron(COLOR_PAIR(3));
mvaddstr(cy - 5, cx - Length(title1) DIV 2, title1);
mvaddstr(cy - 4, cx - Length(title2) DIV 2, title2);
mvaddstr(cy - 3, cx - Length(vstr) DIV 2, PChar(vstr));
attroff(COLOR_PAIR(3));
attron(A_UNDERLINE);
mvaddstr(cy + 2, cx - Length(title3) DIV 2, title3);
attroff(A_UNDERLINE);
end;
var
angle: Double;
ch: chtype;
Hour, Min, Sec, Msec: Word;
Hrest, Mrest, Srest: PRchar;
timestr: AnsiString;
my_bg: NC_FPC_COLOR = COLOR_BLACK;
begin
setlocale(LC_ALL, '');
try
initscr();
noecho();
cbreak();
halfdelay(10);
keypad(stdscr, TRUE);
curs_set(0);
if (has_colors()) then
begin
start_color();
if (use_default_colors() = OK) then
my_bg := -1;
init_pair(1, COLOR_YELLOW, my_bg);
init_pair(2, COLOR_RED, my_bg);
init_pair(3, COLOR_GREEN, my_bg);
init_pair(4, COLOR_CYAN, my_bg);
init_pair(5, COLOR_YELLOW, COLOR_BLACK) ;
end;
clockinit;
repeat
if (ch = KEY_RESIZE) then
begin
flash();
erase();
wrefresh(curscr);
clockinit;
end;
decodeTime(Time, Hour, Min, Sec, Msec);
Hour := Hour MOD 12;
timestr := DateTimeToStr(Now);
mvaddstr(cy + round(sradius) - 4, cx - Length(timestr) DIV 2, PChar(timestr));
angle := Hour * _2PI / 12;
dline(cy, cx, cy - A2Y(angle, hradius), cx + A2X(angle, hradius), chtype('*'),Hrest);
angle := Min * _2PI / 60;
dline(cy, cx, cy - A2Y(angle, mradius), cx + A2X(angle, mradius), chtype('*'),Mrest);
angle := Sec * _2PI / 60;
dline(cy, cx, cy - A2Y(angle, sradius), cx + A2X(angle, sradius), chtype('.'),Srest);
wsyncup(stdscr);
refresh;
ch := getch();
restore(Srest);
restore(Mrest);
restore(Hrest);
until (ch = chtype('q')) OR (ch = KEY_F(10));
finally
curs_set(1);
endwin();
end;
end.
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