org.apache.commons.math3.geometry.partitioning

Interface Hyperplane<S extends Space>

• Type Parameters:
S - Type of the space.
All Known Implementing Classes:
Circle, LimitAngle, Line, OrientedPoint, Plane

public interface Hyperplane<S extends Space>
This interface represents an hyperplane of a space.

The most prominent place where hyperplane appears in space partitioning is as cutters. Each partitioning node in a BSP tree has a cut sub-hyperplane which is either an hyperplane or a part of an hyperplane. In an n-dimensions euclidean space, an hyperplane is an (n-1)-dimensions hyperplane (for example a traditional plane in the 3D euclidean space). They can be more exotic objects in specific fields, for example a circle on the surface of the unit sphere.

Note that this interface is not intended to be implemented by Apache Commons Math users, it is only intended to be implemented within the library itself. New methods may be added even for minor versions, which breaks compatibility for external implementations.

Since:
3.0
• Method Summary

Methods
Modifier and Type Method and Description
Hyperplane<S> copySelf()
Copy the instance.
double getOffset(Point<S> point)
Get the offset (oriented distance) of a point.
double getTolerance()
Get the tolerance below which points are considered to belong to the hyperplane.
Point<S> project(Point<S> point)
Project a point to the hyperplane.
boolean sameOrientationAs(Hyperplane<S> other)
Check if the instance has the same orientation as another hyperplane.
SubHyperplane<S> wholeHyperplane()
Build a sub-hyperplane covering the whole hyperplane.
Region<S> wholeSpace()
Build a region covering the whole space.
• Method Detail

• copySelf

Hyperplane<S> copySelf()
Copy the instance.

The instance created is completely independant of the original one. A deep copy is used, none of the underlying objects are shared (except for immutable objects).

Returns:
a new hyperplane, copy of the instance
• getOffset

double getOffset(Point<S> point)
Get the offset (oriented distance) of a point.

The offset is 0 if the point is on the underlying hyperplane, it is positive if the point is on one particular side of the hyperplane, and it is negative if the point is on the other side, according to the hyperplane natural orientation.

Parameters:
point - point to check
Returns:
offset of the point
• project

Point<S> project(Point<S> point)
Project a point to the hyperplane.
Parameters:
point - point to project
Returns:
projected point
Since:
3.3
• getTolerance

double getTolerance()
Get the tolerance below which points are considered to belong to the hyperplane.
Returns:
tolerance below which points are considered to belong to the hyperplane
Since:
3.3
• sameOrientationAs

boolean sameOrientationAs(Hyperplane<S> other)
Check if the instance has the same orientation as another hyperplane.

This method is expected to be called on parallel hyperplanes. The method should not re-check for parallelism, only for orientation, typically by testing something like the sign of the dot-products of normals.

Parameters:
other - other hyperplane to check against the instance
Returns:
true if the instance and the other hyperplane have the same orientation
• wholeHyperplane

SubHyperplane<S> wholeHyperplane()
Build a sub-hyperplane covering the whole hyperplane.
Returns:
a sub-hyperplane covering the whole hyperplane
• wholeSpace

Region<S> wholeSpace()
Build a region covering the whole space.
Returns:
a region containing the instance