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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._
/**
* Circle ist die Definition eines Kreises.
* @param radius Radius dieses Kreises
* @param density Dichte dieses Kreises
*/
case class Circle(radius: Double, // Radius
density: Double) extends Shape{ // Dichte
val volume = Math.Pi * radius * radius
val I = mass * radius * radius / 2
// AABB(Zentrum - Radius, Zentrum + Radius)
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)
//Ist der gegebene punkt im Radius dieses kreises?
def contains(point: Vector2D) = (point - pos).length <= radius
}
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