Returns a bounds Rectangle calculated from the bounds of all currently
active Particles in this Emitter. If this Emitter has only just been
created and not yet rendered, then calling this method will return a Rectangle
with a max safe integer for dimensions. Use the advance parameter to
avoid this.
Typically it takes a few seconds for a flow Emitter to 'warm up'. You can
use the advance and delta parameters to force the Emitter to
'fast forward' in time to try and allow the bounds to be more accurate,
as it will calculate the bounds based on the particle bounds across all
timesteps, giving a better result.
You can also use the padding parameter to increase the size of the
bounds. Emitters with a lot of randomness in terms of direction or lifespan
can often return a bounds smaller than their possible maximum. By using
the padding (and advance if needed) you can help limit this.
| name | type | arguments | description |
|---|---|---|---|
| padding | number | <optional> |
The amount of padding, in pixels, to add to the bounds Rectangle. |
| advance | number | <optional> |
The number of ms to advance the Particle Emitter by. Defaults to 0, i.e. not used. |
| delta | number | <optional> |
The amount of delta to use for each step. Defaults to 1000 / 60. |
| output | Phaser.Geom.Rectangle | <optional> |
The Rectangle to store the results in. If not given a new one will be created. |
A Rectangle containing the calculated bounds of this Emitter.