Commits on Jul 20, 2018

1. Extract emitter shape so it no longer depens on a View. …

   Now, the interface just specifies x, y, width and height. This allows
   for either
   a Android `View` object, or alternatively an arbitrary rectangle to be
   used for emission
   locations.
   
   It maintains backward compatibility with the current API by overloading
   each method which accepts a `View`. The new method accepts an `Emitter`,
   and the old method delegates to the new method, by passing in a `new
   ViewEmitter(view)` whenever the new method expects an `Emitter`.
   
   In the future, this could be further refactored to expose even more
   flexibility. For example, the entire calculation for initial particle
   locations into the new `Emitter` interface. That is to say, instead of
   it being hard coded to use `x`, `y`, `width`, `height` (and hence a
   rectangle emission area), we could instead have an interface which
   exposes a method `generateParticleLocation()`. Some emitters may choose
   to use a rect, others could use a circle. Others could do even more
   interesting things such as from a point, but randomly distributed around
   the point according to a Gaussian distribution.
   
   Another future refactoring would be to attach the `gravity` argument to
   the `Emitter` itself. That way the `ParticleSystem` itself doesn't need
   to care about whether to anchor particles to the top or bottom of a
   rectangle area. Instead you would configure this on the emitter object
   before passing it to the particle system.

   

   pserwylo committed Jul 20, 2018
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