= Space Boundaries =

== Concept ==
See ticket: [http://www.orxonox.net/ticket/358 Space Boundaries]

== Implementation ==
A new class that is derived from static entity will be written that 
checks for any other entities that are in danger of getting out of range
of the center of the map. It will be called SpaceBoundaries.

A map creator can then add the boundaries to a level via its XML file and 
specify the attributes necessary for it to work.

The SpaceBoundaries object will do its work in the tick function, using an 
Iterator of type MobileEntity. Via the interface of MobileEntity, we can then 
control the pawns away from the boundary or do damage to them.

Goals of the implementation:
 * Detection of pawns exiting the allowed range
 * Reaction to those pawns
 * Preliminary distance measurement: 2-norm
 * (Later: maybe max-norm or 1-norm)
 * Graphical representation of boundaries

== Attributes ==
These attributes can be set for a SpaceBoundaries static entity in the XML file:
 * position - absolute position of the space boundaries in the level (usually 0,0,0)
 * maxdistance - maximum distance pawns can move away from this point
 * warndistance - distance at which pawns receive some kind of warning that they're about to reach

== Actions taken when a pawn reaches the boundary ==
Several measures can be taken when something reaches the boundaries of the level:
 * Damage - the entity could take constant damage over time as long as it is outside the borders
 * Acceleration changes - some kind of invisible wall or acceleration away from the boundary
 * Visual impairment - darkness, fuzziness or something along those lines