diff options
Diffstat (limited to 'src/sims/geometry/Segment.scala')
| -rw-r--r-- | src/sims/geometry/Segment.scala | 28 |
1 files changed, 15 insertions, 13 deletions
diff --git a/src/sims/geometry/Segment.scala b/src/sims/geometry/Segment.scala index 8700979..4aaec21 100644 --- a/src/sims/geometry/Segment.scala +++ b/src/sims/geometry/Segment.scala @@ -6,37 +6,39 @@ package sims.geometry -/**Ein Segment wird durch seine beiden Extrempunkte gegeben. - * @param vertex1 Ortsvektor des 1. Extrempunkts - * @param vertex2 Ortsvektor des 2. Extrempunkts*/ +/**A segment is given by its vertices. + * @param vertex1 position vector of the first vertex + * @param vertex2 position vector of the second vertex + * @throws IllegalArgumentException if both vertices are equal + */ case class Segment(vertex1: Vector2D, vertex2: Vector2D){ require(vertex1 != vertex2, "A segment must have 2 distinct vertices!") - /**Laenge dieses Segments.*/ + /**Length of this segment.*/ val length = (vertex2 - vertex1).length - /**Vektor von EP1 zu EP2.*/ + /**Vector from <code>vertex1</code> to <code>vertex2</code>.*/ val d = vertex2 - vertex1 - /**Einheitsrichtungsvektor.*/ + /**Unit directional vector.*/ val d0 = d.unit - /**Normalenvektor. Richtung: 90 Grad rechts zu d.*/ + /**Right normal vector.*/ val n = d.rightNormal - /**Normaleneinheitsvektor. Richtung: 90 Grad rechts zu d.*/ + /**Right normal unit vector.*/ val n0 = n.unit - /**Kleinster Abstand zwischen diesem Segment und dem Punkt <code>p</code>.*/ + /**Smallest distance between this segment and the point <code>point</code>.*/ def distance(point: Vector2D): Double = { - val v = point - vertex1 //Vektor von EP1 zu point + val v = point - vertex1 //vector from vertex1 to point val projection = v project d val alpha = if (d.x != 0) d.x / projection.x else d.y / projection.y - if (alpha >= 0 && projection.length <= length) //Punkt ist naeher zu der Geraden zwischen EP1 und EP2 + if (alpha >= 0 && projection.length <= length) //point is closer to line between vertex1 and vertex2 (v project n0).length - else if (alpha < 0) //Punkt ist naeher zu EP1 + else if (alpha < 0) //point is closer to vertex1 (point - vertex1).length - else if (alpha > 0) //Punkt ist naeher zu EP2 + else if (alpha > 0) //point is closer to vertex2 (point - vertex2).length else throw new IllegalArgumentException("Error occured trying to compute distance between segment and point.") |