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Diffstat (limited to 'src/main/scala/sims/collision/Circle.scala')
| -rw-r--r-- | src/main/scala/sims/collision/Circle.scala | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/src/main/scala/sims/collision/Circle.scala b/src/main/scala/sims/collision/Circle.scala new file mode 100644 index 0000000..f40da14 --- /dev/null +++ b/src/main/scala/sims/collision/Circle.scala @@ -0,0 +1,41 @@ +/* _____ _ __ ________ ___ *\ +** / ___/(_) |/ / ___/ |__ \ Simple Mechanics Simulator 2 ** +** \__ \/ / /|_/ /\__ \ __/ / copyright (c) 2011 Jakob Odersky ** +** ___/ / / / / /___/ / / __/ ** +** /____/_/_/ /_//____/ /____/ ** +\* */ + +package sims.collision + +import sims.math.Vector2D + +/** Properties implemented by a collidable circle. + * Note: this class does not define any physical properties, see sims.dynamics.Circle for that. + * @see sims.dynamics.Circle */ +trait Circle extends Collidable { + + /** Position of this circle. */ + def position: Vector2D + + /** Radius of this circle. */ + def radius: Double + + /** Returns this circle's axis aligned bounding box. + * @see collision.AABB */ + override def aabb = new AABB(Vector2D(position.x - radius, position.y - radius), Vector2D(position.x + radius, position.y + radius)) + + /** Checks if the point `point` is contained in this circle. */ + override def contains(point: Vector2D) = (point - position).length <= radius + + /** Returns the projection of this polygon onto the line given by the directional vector `axis`. */ + override def project(axis: Vector2D) = { + val dir = axis.unit + new Projection( + axis, + (position - dir * radius) dot dir, + (position + dir * radius) dot dir + ) + } + + override def support(direction: Vector2D) = position + direction.unit * radius +}
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