[path-vector change-desription tag options]

[[:path :to :target] [[number unit]] :set opts]

[[:texture :col] [[3 :col-index]] :set]

[[:translation 0] [[20 :pixels] [1 :second]] :constant]

:animator-id    ; - this name can be used to control animation state via events
:intitial-state ; - :running or :stopped
:limit          ; - :constant animation will end here - will deprcate in future
:on-limit       ; - :signal or :reset
:limit-signal   ; - will send this signal when limit is hit

This namespace provides the core of the animation system.
 These can be added to game-objects with `prospero.game-objects/add-animators`.
Animations can be specified like this:
```
[path-vector change-desription tag options]
```
`path-vector` is simply a vector of keys pointing to where the value will
be changed.  The change-description is used to control the change value.
In the future, there will be a number of other ways to declare animations
and provide custom functions to specify the animation curve. Tag is a spare
parameter that is likely going to be removed.  Options are optional, but
can add extra behaviours to the animation.

A value can be changed or set immediately with a description in this format:
```
[[:path :to :target] [[number unit]] :set opts]
```
For example to set the column in a sprite animation:
```
[[:texture :col] [[3 :col-index]] :set]
```
A constant rate of change can be specified this way:
```
[[:translation 0] [[20 :pixels] [1 :second]] :constant]
```
Keys for options include:
```
:animator-id    ; - this name can be used to control animation state via events
:intitial-state ; - :running or :stopped
:limit          ; - :constant animation will end here - will deprcate in future
:on-limit       ; - :signal or :reset
:limit-signal   ; - will send this signal when limit is hit
```
NB: tag is mostly a free parameter right now, and might
be removed in a future release. 

This provides controls for the audio system.  It's
still pretty limited right now.

This is all internal routines for the collision detection system.

This namespace provides useful routines that differ across
host languages.

::pospero.constraints/keep-on-screen ; - can keep the player object on screen

Constraints provide a set of common state updating functions
that can be used to control object behaviour.
```
::pospero.constraints/keep-on-screen ; - can keep the player object on screen
```

Clojure game engine with plugable renderer options.
Check out the docs `prospero.game-objects` for a good place to start.

This has collected convenience functions for building up game objects.

Some useful math functions - more to come around 1.0.0

This namespace provides the extension points to connect
other game systems to *Prospero*.  More documentation will
follow on the 1.0.0 timeframe.

Llkely to be entirely replaced by the animation system,
or mostly moved into math.