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/*
* Simple Mechanics Simulator (SiMS)
* copyright (c) 2009 Jakob Odersky
* made available under the MIT License
*/
package sims.dynamics
import sims.geometry._
import sims.collision._
/**
* A circle.
* @param radius radius of this circle
* @param density density of this circle
*/
case class Circle(radius: Double, density: Double) extends Shape{
val volume = Math.Pi * radius * radius
val I = mass * radius * radius / 2
def AABB = new AABB(pos - Vector2D(radius,radius),
pos + Vector2D(radius,radius))
def project(axis: Vector2D) = if (axis.x != 0) Projection(axis,
(pos.project(axis).x / axis.x) - radius,
(pos.project(axis).x / axis.x) + radius)
else Projection(axis,
(pos.project(axis).y / axis.y) - radius,
(pos.project(axis).y / axis.y) + radius)
def contains(point: Vector2D) = (point - pos).length <= radius
}
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