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/*
* $Id: fdhand.c,v 1.3 2003/12/02 08:24:06 keithp Exp $
*
* Copyright © 2003 Keith Packard
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that
* copyright notice and this permission notice appear in supporting
* documentation, and that the name of Keith Packard not be used in
* advertising or publicity pertaining to distribution of the software without
* specific, written prior permission. Keith Packard makes no
* representations about the suitability of this software for any purpose. It
* is provided "as is" without express or implied warranty.
*
* KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
* EVENT SHALL KEITH PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
#include "fdhand.h"
#include <sys/time.h>
#include <time.h>
#include <math.h>
#define PI_6 (M_PI/6.0)
static void
draw_hour (cairo_t *cr, double width, double length)
{
double r = width / 2;
cairo_move_to (cr, length, -r);
cairo_arc (cr, length, 0, r, -M_PI_2, M_PI_2);
cairo_line_to (cr, width * M_SQRT2, r);
cairo_arc (cr, 0, 0, r*2, PI_6, - PI_6);
cairo_close_path (cr);
}
static void
draw_minute (cairo_t *cr, double width, double length)
{
double r = width / 2;
cairo_move_to (cr, length, -r);
cairo_arc (cr, length, 0, r, -M_PI_2, M_PI_2);
cairo_line_to (cr, 0, r);
cairo_line_to (cr, 0, -r);
cairo_close_path (cr);
}
static void
draw_second (cairo_t *cr, double width, double length)
{
double r = width / 2;
double thick = width;
double back = length / 3;
double back_thin = length / 10;
cairo_move_to (cr, length, -r);
cairo_arc (cr, length, 0, r, -M_PI_2, M_PI_2);
cairo_line_to (cr, -back_thin, r);
cairo_line_to (cr, -back_thin, thick);
cairo_line_to (cr, -back, thick);
cairo_line_to (cr, -back, -thick);
cairo_line_to (cr, -back_thin, -thick);
cairo_line_to (cr, -back_thin, -r);
cairo_close_path (cr);
}
static void
draw_hand (cairo_t *cr, double angle, double width, double length, double alt,
void (*draw) (cairo_t *cr, double width, double length))
{
/* Disabled shadow
cairo_save (cr);
{
cairo_translate (cr, alt/2, alt);
cairo_rotate (cr, angle);
(*draw) (cr, width, length);
cairo_set_rgb_color (cr, 0, 0, 0);
cairo_set_alpha (cr, 0.3);
cairo_fill (cr);
}
cairo_restore (cr);
*/
cairo_save (cr);
{
cairo_rotate (cr, angle);
(*draw) (cr, width, length);
cairo_set_source_rgb (cr, 0, 0, 0);
cairo_fill (cr);
}
cairo_restore (cr);
}
static void
draw_time (cairo_t *cr, double width, double height, struct timeval *tv, int seconds)
{
double hour_angle, minute_angle, second_angle;
struct tm tm_ret;
struct tm *tm;
tm = localtime_r (&tv->tv_sec, &tm_ret);
second_angle = (tm->tm_sec + tv->tv_usec / 1000000.0) * 6.0;
minute_angle = tm->tm_min * 6.0 + second_angle / 60.0;
hour_angle = tm->tm_hour * 30.0 + minute_angle / 12.0;
cairo_save (cr);
{
cairo_scale (cr, width, height);
cairo_translate (cr, 0.5, 0.5);
draw_hand (cr, hour_angle * M_PI / 180.0 - M_PI_2,
0.03, 0.25, 0.010, draw_hour);
draw_hand (cr, minute_angle * M_PI / 180.0 - M_PI_2,
0.015, 0.39, 0.020, draw_minute);
if (seconds)
draw_hand (cr, second_angle * M_PI / 180.0 - M_PI_2,
0.0075, 0.32, 0.026, draw_second);
}
cairo_restore (cr);
}
void
fdhand_draw_now (cairo_t *cr, double width, double height, int seconds)
{
struct timeval tv;
gettimeofday (&tv, NULL);
draw_time (cr, width, height, &tv, seconds);
}
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