The return value is of the form: Manually start the system running.
By default the system will run and pause on its own based on the level of energy in the particles.
Parameters can also be passed in an object literal. Particle System(600, 1000, .5, 55, .02, false) arbor.
For reference, the following calls are all equivalent: arbor. Particle System() Once a particle system has been created, the parameters can be tweaked by passing an object to the method: var sys = arbor.
You should only need to manually start after having previously called the All arguments are integers defining the number of pixels that should be left blank along each edge of the display area.