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clock: import from plan 9

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Fixes #250.
This commit is contained in:
Russ Cox 2020-01-13 16:53:30 -05:00
parent be263a722e
commit ac6456a0cc
2 changed files with 112 additions and 5 deletions
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13
man/man1/date.1
View file

@ -1,6 +1,6 @@
.TH DATE 1
.SH NAME
date \- date and time
date, clock \- date and time
.SH SYNOPSIS
.B date
[
@ -8,8 +8,8 @@ date \- date and time
] [
.I seconds
]
.\" .br
.\" .B clock
.br
.B clock
.SH DESCRIPTION
Print the date, in the format
.PP
@ -34,6 +34,9 @@ If the optional argument
.I seconds
is present, it is used as the time to convert rather than
the real time.
.PP
.I Clock
draws a simple analog clock in its window.
.\" .SH FILES
.\" .TF /adm/timezone/local
.\" .TP
@ -54,5 +57,5 @@ the real time.
.\" draws a simple analog clock in its window.
.SH SOURCE
.B \*9/src/cmd/date.c
.\" .br
.\" .B \*9/src/cmd/draw/clock.c
.br
.B \*9/src/cmd/draw/clock.c

104
src/cmd/draw/clock.c Normal file
View file

@ -0,0 +1,104 @@
#include <u.h>
#include <libc.h>
#include <draw.h>
#include <event.h>
Image *hrhand, *minhand;
Image *dots, *back;
Point
circlept(Point c, int r, int degrees)
{
double rad;
rad = (double) degrees * PI/180.0;
c.x += cos(rad)*r;
c.y -= sin(rad)*r;
return c;
}
void
redraw(Image *screen)
{
static int tm, ntm;
static Rectangle r;
static Point c;
static int rad;
int i;
int anghr, angmin;
static Tm tms;
static Tm ntms;
ntm = time(0);
if(ntm == tm && eqrect(screen->r, r))
return;
ntms = *localtime(ntm);
anghr = 90-(ntms.hour*5 + ntms.min/12)*6;
angmin = 90-ntms.min*6;
tm = ntm;
tms = ntms;
r = screen->r;
c = divpt(addpt(r.min, r.max), 2);
rad = Dx(r) < Dy(r) ? Dx(r) : Dy(r);
rad /= 2;
rad -= 8;
draw(screen, screen->r, back, nil, ZP);
for(i=0; i<12; i++)
fillellipse(screen, circlept(c, rad, i*(360/12)), 2, 2, dots, ZP);
line(screen, c, circlept(c, (rad*3)/4, angmin), 0, 0, 1, minhand, ZP);
line(screen, c, circlept(c, rad/2, anghr), 0, 0, 1, hrhand, ZP);
flushimage(display, 1);
}
void
eresized(int new)
{
if(new && getwindow(display, Refnone) < 0)
fprint(2,"can't reattach to window");
redraw(screen);
}
void
main(int argc, char **argv)
{
Event e;
Mouse m;
Menu menu;
char *mstr[] = {"exit", 0};
int key, timer;
int t;
USED(argc);
USED(argv);
if (initdraw(0, 0, "clock") < 0)
sysfatal("initdraw failed");
back = allocimagemix(display, DPalebluegreen, DWhite);
hrhand = allocimage(display, Rect(0,0,1,1), CMAP8, 1, DDarkblue);
minhand = allocimage(display, Rect(0,0,1,1), CMAP8, 1, DPaleblue);
dots = allocimage(display, Rect(0,0,1,1), CMAP8, 1, DBlue);
redraw(screen);
einit(Emouse);
t = (30*1000);
timer = etimer(0, t);
menu.item = mstr;
menu.lasthit = 0;
for(;;) {
key = event(&e);
if(key == Emouse) {
m = e.mouse;
if(m.buttons & 4) {
if(emenuhit(3, &m, &menu) == 0)
exits(0);
}
} else if(key == timer) {
redraw(screen);
}
}
}