org.apache.commons.math3.geometry.euclidean.threed

## Class Line

• All Implemented Interfaces:
Embedding<Euclidean3D,Euclidean1D>

public class Line
extends Object
implements Embedding<Euclidean3D,Euclidean1D>
The class represent lines in a three dimensional space.

Each oriented line is intrinsically associated with an abscissa which is a coordinate on the line. The point at abscissa 0 is the orthogonal projection of the origin on the line, another equivalent way to express this is to say that it is the point of the line which is closest to the origin. Abscissa increases in the line direction.

Since:
3.0
Version:
$Id: Line.java 1555176 2014-01-03 18:07:59Z luc$
• ### Constructor Detail

• #### Line

public Line(Vector3D p1,
Vector3D p2,
double tolerance)
throws MathIllegalArgumentException
Build a line from two points.
Parameters:
p1 - first point belonging to the line (this can be any point)
p2 - second point belonging to the line (this can be any point, different from p1)
tolerance - tolerance below which points are considered identical
Throws:
MathIllegalArgumentException - if the points are equal
Since:
3.3
• #### Line

public Line(Line line)
Copy constructor.

The created instance is completely independent from the original instance, it is a deep copy.

Parameters:
line - line to copy
• ### Method Detail

• #### getTolerance

public double getTolerance()
Get the tolerance below which points are considered identical.
Returns:
tolerance below which points are considered identical
Since:
3.3
• #### revert

public Line revert()
Get a line with reversed direction.
Returns:
a new instance, with reversed direction
• #### getDirection

public Vector3D getDirection()
Get the normalized direction vector.
Returns:
normalized direction vector
• #### getOrigin

public Vector3D getOrigin()
Get the line point closest to the origin.
Returns:
line point closest to the origin
• #### getAbscissa

public double getAbscissa(Vector3D point)
Get the abscissa of a point with respect to the line.

The abscissa is 0 if the projection of the point and the projection of the frame origin on the line are the same point.

Parameters:
point - point to check
Returns:
abscissa of the point
• #### pointAt

public Vector3D pointAt(double abscissa)
Get one point from the line.
Parameters:
abscissa - desired abscissa for the point
Returns:
one point belonging to the line, at specified abscissa
• #### toSubSpace

public Vector1D toSubSpace(Vector<Euclidean3D> vector)
Transform a space point into a sub-space point.
Parameters:
vector - n-dimension point of the space
Returns:
(n-1)-dimension point of the sub-space corresponding to the specified space point
• #### toSpace

public Vector3D toSpace(Vector<Euclidean1D> vector)
Transform a sub-space point into a space point.
Parameters:
vector - (n-1)-dimension point of the sub-space
Returns:
n-dimension point of the space corresponding to the specified sub-space point
• #### isSimilarTo

public boolean isSimilarTo(Line line)
Check if the instance is similar to another line.

Lines are considered similar if they contain the same points. This does not mean they are equal since they can have opposite directions.

Parameters:
line - line to which instance should be compared
Returns:
true if the lines are similar
• #### contains

public boolean contains(Vector3D p)
Check if the instance contains a point.
Parameters:
p - point to check
Returns:
true if p belongs to the line
• #### distance

public double distance(Vector3D p)
Compute the distance between the instance and a point.
Parameters:
p - to check
Returns:
distance between the instance and the point
• #### distance

public double distance(Line line)
Compute the shortest distance between the instance and another line.
Parameters:
line - line to check against the instance
Returns:
shortest distance between the instance and the line
• #### closestPoint

public Vector3D closestPoint(Line line)
Compute the point of the instance closest to another line.
Parameters:
line - line to check against the instance
Returns:
point of the instance closest to another line
• #### intersection

public Vector3D intersection(Line line)
Get the intersection point of the instance and another line.
Parameters:
line - other line
Returns:
intersection point of the instance and the other line or null if there are no intersection points
• #### wholeLine

public SubLine wholeLine()
Build a sub-line covering the whole line.
Returns:
a sub-line covering the whole line