Counters are used to control the rate of particle emission by an Emitter.

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	Interface	Description
	Counter	The Counter interface must be implemented by all counters.

	Class	Description
	Blast	The Blast counter causes the emitter to create a single burst of particles when it starts and then emit no further particles.
	KeyDownCounter	The KeyDownCounter Counter modifies another counter to only emit particles when a specific key is being pressed.
	PerformanceAdjusted	The PerformanceAdjusted counter causes the emitter to emit particles continuously at a steady rate.
	Pulse	The Pulse counter causes the emitter to emit groups of particles at a regular interval.
	Random	The Steady counter causes the emitter to emit particles continuously at a steady rate.
	SineCounter	The Sine counter causes the emitter to emit particles continuously at a rate that varies according to a sine wave.
	Steady	The Steady counter causes the emitter to emit particles continuously at a steady rate.
	TimePeriod	The TimePeriod counter causes the emitter to emit particles for a period of time and then stop.
	ZeroCounter	The Zero counter causes the emitter to emit no particles.