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clock.c
175 lines (131 loc) · 3.47 KB
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clock.c
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#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#include <gtk/gtk.h>
#include <cairo.h>
#include "clock.h"
#include "clock_date.h"
/* global declarations */
int main(int argc, char *argv[])
{
GtkWidget *window;
rclk *clock;
gtk_init(&argc, &argv);
window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
gtk_window_set_title(GTK_WINDOW(window), "RClock");
g_signal_connect(G_OBJECT(window), "destroy",
G_CALLBACK(clock_destroy), NULL);
gtk_window_set_default_size(GTK_WINDOW(window), 300, 300);
gtk_widget_set_app_paintable(window, TRUE);
gtk_widget_show_all(window);
/* create the clock */
clock = clock_init(window);
g_timeout_add_seconds(1, &clock_tick, clock);
g_signal_connect(G_OBJECT(window), "expose-event",
G_CALLBACK(clock_expose), clock);
gtk_main();
clock_free(clock);
return EXIT_SUCCESS;
}
rclk* clock_init(GtkWidget *widget)
{
int width, height, i;
double millis = ((double) time(NULL)) * 1000;
int32_t year = 0;
int32_t day_of_year = 0;
int32_t day_of_month = 0;
int32_t month = 0;
int32_t hours = 0;
int32_t minutes = 0;
int32_t seconds = 0;
rclk *clock;
/* alloc memory */
clock = malloc(sizeof(rclk));
clock_date_compute(millis, &month,
&day_of_month, &day_of_year, &year);
clock_time_compute(millis, &seconds, &minutes, &hours);
double angles[5] = {
(2 * M_PI / 60) * seconds,
(2 * M_PI / 60) * minutes,
(2 * M_PI / 24) * hours,
(2 * M_PI / 31) * day_of_month,
(2 * M_PI / 12) * month};
double d_angles[5] = {
(2 * M_PI / 60),
(2 * M_PI / 3600),
(2 * M_PI / 86400),
(2 * M_PI / 2678400),
(2 * M_PI / 32140800)};
clock->cr = gdk_cairo_create(widget->window);
clock->widget = widget;
clock->started = (int32_t) time(NULL);
gtk_window_get_size(GTK_WINDOW(widget), &width, &height);
/* create the various rings */
for(i = 0; i < 5; ++i) {
clock->rings[i].radius = 50 + (20 * i);
clock->rings[i].angle = angles[i];
clock->rings[i].d_angle = d_angles[i];
}
return clock;
}
void clock_free(rclk *clock) {
free(clock);
}
static void clock_destroy(
GtkWidget *widget,
GdkEvent *event,
gpointer data)
{
gtk_main_quit();
}
static gboolean clock_expose(
GtkWidget *widget,
GdkEvent *event,
gpointer data)
{
clock_render((rclk *) data);
return FALSE;
}
static gboolean clock_tick(gpointer data)
{
int width, height;
rclk *clock;
clock = (rclk *) data;
gtk_window_get_size(GTK_WINDOW(clock->widget), &width, &height);
GdkRectangle rect;
rect.x = 0;
rect.y = 0;
rect.width = width;
rect.height = height;
gdk_window_invalidate_rect(clock->widget->window, &rect, FALSE);
return TRUE;
}
void clock_render(rclk *clock)
{
cairo_t *cr;
int width, height, i;
double offset, angle1, angle2;
double elapsed = (double) (((int32_t) time(NULL)) - clock->started);
gtk_window_get_size(GTK_WINDOW(clock->widget), &width, &height);
clock->cr = gdk_cairo_create(clock->widget->window);
cr = clock->cr;
offset = M_PI / -2.0;
for(i = 0; i < 5; ++i) {
angle2 = fmod(clock->rings[i].angle +
(clock->rings[i].d_angle * elapsed), 2 * M_PI) + offset;
angle1 = angle2 + offset;
cairo_set_source_rgb(cr, 1, 1, 1);
cairo_new_sub_path(cr);
cairo_set_line_width(cr, 4.0);
cairo_arc(cr, width/2, height/2, clock->rings[i].radius, 0,
2 * M_PI);
cairo_stroke(cr);
cairo_set_source_rgba(cr, 0.3, 0.3, 0.3, 0.4);
cairo_new_sub_path(cr);
cairo_set_line_width(cr, 2.0);
cairo_arc(cr, width/2, height/2, clock->rings[i].radius,
offset, angle2);
cairo_stroke(cr);
}
cairo_destroy(clock->cr);
}