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/* _____ _ __ ________ ___ *\
** / ___/(_) |/ / ___/ |__ \ Simple Mechanics Simulator 2 **
** \__ \/ / /|_/ /\__ \ __/ / copyright (c) 2011 Jakob Odersky **
** ___/ / / / / /___/ / / __/ **
** /____/_/_/ /_//____/ /____/ **
\* */
package sims.collision
import sims.math._
/*
* y
* ^
* |
* | +-------+
* | | max|
* | | |
* | |min |
* | +-------+
* |
* 0-------------->x
*
*/
/** Axis Aligned Bounding Boxes (AABBs) are rectangles that frame a shape.
* Their X-axis and Y-axis orientation makes it easy to test two AABBs for overlap.
* @param minVertex Position vector of the bottom-left vertex
* @param maxVertex Position vector of the upper-right vertex */
case class AABB(val minVertex: Vector2D,
val maxVertex: Vector2D) {
/** Diagonal vector from `minVertex` to `maxVertex`. */
def diagonal = maxVertex - minVertex
/** Width of this AABB. */
def width = maxVertex.x - minVertex.x
/** Height of this AABB. */
def height = maxVertex.y - minVertex.y
/** Checks if the given point is located within this AABB. */
def contains(point: Vector2D): Boolean = minVertex.x <= point.x && point.x <= maxVertex.x && minVertex.y <= point.y && point.y <= maxVertex.y
/** Checks if the given AABB is located within this AABB. */
def contains(box: AABB): Boolean = contains(box.minVertex) && contains(box.maxVertex)
/** Checks this AABB with <code>box</code> for overlap.
* @param box AABB with which to check for overlap */
def overlaps(box: AABB): Boolean = {
val d1 = box.minVertex - maxVertex
val d2 = minVertex - box.maxVertex
!(d1.x > 0 || d1.y > 0 || d2.x > 0 || d2.y > 0)
}
}
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