+Scalar Timer::nextFire_ = std::numeric_limits<Scalar>::max();
+std::map<unsigned,Timer&> Timer::timers_;
+
+
+unsigned Timer::getNewID()
+{
+ static unsigned id = 1;
+ return id++;
+}
+
+
+void Timer::init(const Function& function, Scalar seconds, Mode mode)
+{
+ invalidate();
+
+ mode_ = mode;
+
+ if (mode_ != INVALID)
+ {
+ function_ = function;
+
+ if (mode == ABSOLUTEE)
+ {
+ absolute_ = seconds;
+ }
+ else
+ {
+ absolute_ = seconds - getTicks();
+ interval_ = seconds;
+ }
+
+ id_ = getNewID();
+ timers_.insert(std::pair<unsigned,Timer&>(id_, *this));
+
+ if (absolute_ < nextFire_) nextFire_ = absolute_;
+ }
+}
+
+
+bool Timer::isValid() const
+{
+ return mode_ != INVALID;
+}
+
+void Timer::invalidate()
+{
+ if (mode_ != INVALID)
+ {
+ timers_.erase(id_);
+ mode_ = INVALID;
+
+ if (isEqual(absolute_, nextFire_)) nextFire_ = findNextFire();
+ }
+}
+
+
+void Timer::fire()
+{
+ Scalar t = getTicks();
+
+ if (function_) function_(*this, t);
+
+ if (isRepeating())
+ {
+ Scalar absolute = absolute_;
+
+ if (isEqual(absolute_, t, 1.0)) absolute_ += interval_;
+ else absolute_ = interval_ + t;
+
+ if (isEqual(absolute, nextFire_)) nextFire_ = findNextFire();
+ }
+ else
+ {
+ invalidate();
+ }
+}
+
+
+Scalar Timer::findNextFire()
+{
+ std::map<unsigned,Timer&>::iterator it;
+ Scalar nextFire = std::numeric_limits<Scalar>::max();
+
+ for (it = timers_.begin(); it != timers_.end(); ++it)
+ {
+ Scalar absolute = (*it).second.absolute_;
+ if (absolute < nextFire) nextFire = absolute;
+ }
+
+ return nextFire;
+}
+
+
+Scalar Timer::getSecondsRemaining() const
+{
+ return absolute_ - getTicks();
+}
+
+bool Timer::isExpired() const
+{
+ return getSecondsRemaining() < 0.0;
+}
+
+bool Timer::isRepeating() const
+{
+ return mode_ == REPEAT;
+}
+
+
+void Timer::fireIfExpired(Scalar t)
+{
+ std::map<unsigned,Timer&>::iterator it;
+
+ if (nextFire_ > t) return;
+
+ for (it = timers_.begin(); it != timers_.end(); ++it)
+ {
+ Timer& timer = (*it).second;
+ if (timer.isExpired()) timer.fire();
+ }
+}
+
+