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#include <gtk/gtk.h>
struct glitchyclock
{
GtkWidget *da;
PangoFontDescription *fontdesc;
int nglitch;
time_t glitch_base;
};
const int glitch_times[] = {
7, 15,
23, 58,
-1, -1
};
static time_t get_monotonic_seconds()
{
struct timespec tp;
clock_gettime(CLOCK_MONOTONIC, &tp);
return tp.tv_sec;
}
static void do_glitch(struct glitchyclock *gc)
{
if ( glitch_times[2*(gc->nglitch+1)] == -1 ) return;
gc->nglitch++;
gc->glitch_base = get_monotonic_seconds();
}
static gboolean draw_sig(GtkWidget *widget, cairo_t *cr, struct glitchyclock *gc)
{
int w, h;
int lw, lh;
double sf;
PangoLayout *layout;
const double screen_w_frac = 0.4;
int glitch_hours, glitch_minutes;
char timestr[64];
int seconds;
w = gtk_widget_get_allocated_width(widget);
h = gtk_widget_get_allocated_height(widget);
/* Overall background */
cairo_set_source_rgb(cr, 0.0, 0.0, 0.0);
cairo_paint(cr);
layout = pango_layout_new(gtk_widget_get_pango_context(widget));
pango_layout_set_alignment(layout, PANGO_ALIGN_CENTER);
pango_layout_set_font_description(layout, gc->fontdesc);
glitch_hours = glitch_times[gc->nglitch*2];
glitch_minutes = glitch_times[gc->nglitch*2+1];
seconds = get_monotonic_seconds() - gc->glitch_base;
if ( seconds < 4 ) {
strcpy(timestr, "rK:S8");
} else {
int hours, minutes;
hours = (seconds/3600 + glitch_hours) % 24;
minutes = (seconds/60 + glitch_minutes) % 60;
snprintf(timestr, 63, "%02i:%02i", hours, minutes);
}
pango_layout_set_text(layout, timestr, -1);
pango_cairo_update_layout(cr, layout);
pango_layout_get_size(layout, &lw, &lh);
sf = (double)PANGO_SCALE*screen_w_frac*w/lw;
cairo_scale(cr, sf, sf);
pango_cairo_update_layout(cr, layout);
pango_layout_get_size(layout, &lw, &lh);
lw /= PANGO_SCALE; lh /= PANGO_SCALE;
w /= sf; h /= sf;
cairo_translate(cr, (w-lw)/2.0, h-lh);
pango_cairo_update_layout(cr, layout);
cairo_set_source_rgb(cr, 1.0, 0.0, 0.0);
pango_cairo_show_layout(cr, layout);
return FALSE;
}
static gboolean redraw_cb(gpointer data)
{
gint w, h;
struct glitchyclock *gc = data;
w = gtk_widget_get_allocated_width(GTK_WIDGET(gc->da));
h = gtk_widget_get_allocated_height(GTK_WIDGET(gc->da));
gtk_widget_queue_draw_area(GTK_WIDGET(gc->da), 0, 0, w, h);
return G_SOURCE_CONTINUE;
}
static gboolean key_press_sig(GtkWidget *da, GdkEventKey *event, struct glitchyclock *gc)
{
if ( event->keyval == GDK_KEY_KP_Enter ) {
do_glitch(gc);
redraw_cb(gc);
return TRUE;
}
return FALSE;
}
static gint realise_sig(GtkWidget *da, struct glitchyclock *gc)
{
GdkWindow *win = gtk_widget_get_window(da);
/* Keyboard and input method stuff */
gdk_window_set_accept_focus(win, TRUE);
g_signal_connect(G_OBJECT(da), "key-press-event", G_CALLBACK(key_press_sig), gc);
gc->fontdesc = pango_font_description_from_string("DSEG7 Modern Bold 16");
return FALSE;
}
int main(int argc, char *argv[])
{
struct glitchyclock gc;
GtkWidget *mainwindow;
gc.nglitch = 0;
gc.glitch_base = get_monotonic_seconds();
gtk_init(&argc, &argv);
mainwindow = gtk_window_new(GTK_WINDOW_TOPLEVEL);
gtk_window_fullscreen(GTK_WINDOW(mainwindow));
g_signal_connect_swapped(G_OBJECT(mainwindow), "destroy", gtk_main_quit, NULL);
gc.da = gtk_drawing_area_new();
gtk_container_add(GTK_CONTAINER(mainwindow), GTK_WIDGET(gc.da));
gtk_widget_set_can_focus(GTK_WIDGET(gc.da), TRUE);
gtk_widget_add_events(gc.da, GDK_KEY_PRESS_MASK | GDK_KEY_RELEASE_MASK);
g_signal_connect(G_OBJECT(gc.da), "draw", G_CALLBACK(draw_sig), &gc);
g_signal_connect(G_OBJECT(gc.da), "realize", G_CALLBACK(realise_sig), &gc);
gtk_widget_grab_focus(GTK_WIDGET(gc.da));
gtk_widget_show_all(mainwindow);
g_timeout_add(1000, redraw_cb, &gc);
gtk_main();
return 0;
}
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