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Diffstat (limited to 'src/main/scala/sims/collision/CachedCollidable.scala')
| -rw-r--r-- | src/main/scala/sims/collision/CachedCollidable.scala | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/src/main/scala/sims/collision/CachedCollidable.scala b/src/main/scala/sims/collision/CachedCollidable.scala new file mode 100644 index 0000000..d3522a4 --- /dev/null +++ b/src/main/scala/sims/collision/CachedCollidable.scala @@ -0,0 +1,30 @@ +/* _____ _ __ ________ ___ *\ +** / ___/(_) |/ / ___/ |__ \ 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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