terom@205: 
terom@205: #include "Timer.hh"
terom@205: 
terom@205: Timer::Timer (TimeMS interval) :
terom@282:     interval(interval), 
terom@282:     ticks(0), 
terom@282:     enabled(false),
terom@282:     last_tick(0)
terom@205: {
terom@205: 
terom@205: }
terom@205: 
terom@205: TickCount Timer::get_ticks (void) {
terom@205:     return ticks;
terom@205: }
terom@205: 
terom@205: void Timer::start (void) {
terom@205:     last_tick = CL_System::get_time();
terom@205: 
terom@205:     enabled = true;
terom@300:     single_shot = false;
terom@300: }
terom@300:         
terom@300: void Timer::fire_once (void) {
terom@300:     last_tick = CL_System::get_time();
terom@300: 
terom@300:     enabled = true;
terom@300:     single_shot = true;
terom@205: }
terom@205: 
terom@205: void Timer::keep_alive (void) {
terom@205:     // ignore if disabled
terom@205:     if (!enabled)
terom@205:         return;
terom@205: 
terom@205:     // get current time
terom@205:     TimeMS now = CL_System::get_time();
terom@205: 
terom@205:     // handle overflows
terom@205:     if (last_tick > now)
terom@205:         last_tick = now;
terom@205:     
terom@205:     // is the tick over?
terom@205:     if (last_tick + interval < now) {
terom@205:         // the length of this tick
terom@205:         TimeMS tick_length = now - last_tick;
terom@205:         
terom@205:         // trigger our signal
terom@205:         _sig_tick(tick_length);
terom@205:         
terom@205:         // update state
terom@205:         last_tick = now;
terom@205:         ticks += tick_length / interval;
terom@300: 
terom@300:         // if it was single-shot, disable
terom@300:         if (single_shot)
terom@300:             enabled = false;
terom@205:     }
terom@205: }
terom@205: