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Adds a point that will attract every particle of the emitter at a given time in their life.

AddParticlesGravityForce( ID, starttime, endtime, x, y, f )

ID - The ID of the emitter to modify.
starttime - The time in a particle's life at which this force should start having an effect.
endtime - The time in a particle's life at which this force should stop having an effect.
x - The x coordinate of the gravity point.
y - The y coordinate of the gravity point.
f - The force with which the particule is pulled towards the point in unit per second.

And of course the sister command: ClearParticlesGravityForce(ID).

I didn't find a way to use the current particle system to achieve such a result. This could be done from scratch with the sprite commands but we would lose the performance boost from the optimised particle system. I think this command would fit well in the current system and I think we could make some nice visual effects with it.

nice idea.
http://code.google.com/p/agk/issues/list

i think its similar this command.
AddParticlesForce( ID, starttime, endtime, x, y )
the force * normalized vector to gravity point.

AddParticlesForce adds the same vector to every particle. AddParticlesGravityForce would apply a different vector to each particle (with the same force) depending on their position to the gravity point.

AddParticlesRepulsionForce( ID, starttime, endtime, x, y, f )

The opposite effect: place a point that repulses every particle outward.

ohh, you are right,sorry.