blob: f40da14232db572070a26d85975d46130336ce9e (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
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
}
|
