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/* _____ _ __ ________ ___ *\
** / ___/(_) |/ / ___/ |__ \ Simple Mechanics Simulator 2 **
** \__ \/ / /|_/ /\__ \ __/ / copyright (c) 2011 Jakob Odersky **
** ___/ / / / / /___/ / / __/ **
** /____/_/_/ /_//____/ /____/ **
\* */
package sims.collision
import sims.math._
/**Projection on an axis.
* <p>
* Projections are commonly used in SiMS for collision detection.
* @param axis directional vector of the axis of the projection
* @param lower lower value of the projection
* @param upper upper value of the projection*/
case class Projection(axis: Vector2D,
lower: Double,
upper: Double) {
require(axis != Vector2D.Null, "A projection's axis cannot be given by a null vector!")
require(lower <= upper, "Invalid bounds. Lower must be less than or equal to upper.")
/**Checks this projection for overlap with another projection.
* @throws IllegalArgumentExcepion if both projections have different axes*/
def overlaps(other: Projection): Boolean = {
require(axis == other.axis, "Cannot compare two projections on different axes!")
!((other.lower - this.upper) > 0 || (this.lower - other.upper) > 0)
}
/**Returns the overlap between this projection and another projection.
* @throws IllegalArgumentExcepion if both projections have different axes*/
def overlap(other: Projection): Double = {
require(axis == other.axis, "Cannot compare two projections on different axes!")
math.min(upper, other.upper) - math.max(lower, other.lower)
}
}
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