September 2016
Beginner to intermediate
1089 pages
23h 8m
English
Content preview from Android Game Programming: A Developer’s GuideBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Emitters
The other way to use particle systems is to configure them as emitters. This means that there is a ratio of particles per second that your system emits while it is active.
Calculating the right pool size is quite easy. It is just a formula based on the particle's time to live and the number of particles per second you want. For example, using 20 particles per second with 500 milliseconds time to live, you only need a pool of 10 particles, since they are returned to the pool as they die.
It is important to remember that a ParticleSystem working as an emitter needs to be added and removed from the GameEngine, since the onUpdate method is required to check for the spawning of more particles. The onUpdate method of the ParticleSystem looks ...
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