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/* _____ _ __ ________ ___ *\
** / ___/(_) |/ / ___/ |__ \ Simple Mechanics Simulator 2 **
** \__ \/ / /|_/ /\__ \ __/ / copyright (c) 2011 Jakob Odersky **
** ___/ / / / / /___/ / / __/ **
** /____/_/_/ /_//____/ /____/ **
\* */
package sims.collision
/** Implements features of a collidable object to be evaluated lazily and only
* to be be recomputed when the collidable object moves. */
trait CachedCollidable extends Collidable {
/** Invalidates all features and forces their evaluation on next call.
* Should be called by clients when this object moves. */
def move() = {
_aabbValid = false
}
private var _aabb: AABB = null
private var _aabbValid = false
abstract override def aabb = {
if (! _aabbValid) {
_aabb = super.aabb
_aabbValid = true
}
_aabb
}
}
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