Issue #599 resolved
ParticleSystem vertical/horizontal acceleration
I propose that
setGravity be renamed to
setVerticalAccelerationis abstract, like the other particle system names. (
setWindSpeed, you know what I mean? :D)
setVerticalAccelerationis more descriptive, and has an obvious meaning. It isn't necessarily completely obvious that "gravity" is synonymous with "vertical acceleration".
setGravitykind of assumes how it will be used.
I also propose that there be a
setHorizontalAcceleration method too to go with it.