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/*
* Simple Mechanics Simulator (SiMS)
* copyright (c) 2009 Jakob Odersky
* made available under the MIT License
*/
package sims.geometry
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!")
/**Checks this projection for overlap with another projection <code>other</code>.
* @throws IllegalArgumentExcepion if both projections axes aren't the same*/
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 <code>other</code>.
* @throws IllegalArgumentExcepion if both projections axes aren't the same*/
def overlap(other: Projection): Double = {
require(axis == other.axis, "Cannot compare two projections on different axes!")
(Math.max(lower, other.lower) - Math.min(upper, other.upper)).abs
}
}
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