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

## Class Plane

- java.lang.Object
- - org.apache.commons.math3.geometry.euclidean.threed.Plane

All Implemented Interfaces:
  Embedding<Euclidean3D,Euclidean2D>, Hyperplane<Euclidean3D>

    public class Plane
    extends Object
    implements Hyperplane<Euclidean3D>, Embedding<Euclidean3D,Euclidean2D>

The class represent planes in a three dimensional space.

Since:
  3.0
Version:
  $Id: Plane.java 1416643 2012-12-03 19:37:14Z tn $

### Field Summary

Fields
`private Vector3D` `origin` Origin of the plane frame.
`private double` `originOffset` Offset of the origin with respect to the plane.
`private Vector3D` `u` First vector of the plane frame (in plane).
`private Vector3D` `v` Second vector of the plane frame (in plane).
`private Vector3D` `w` Third vector of the plane frame (plane normal).

### Constructor Summary

Constructors
Constructor and Description
`Plane(Plane plane)` Copy constructor.
`Plane(Vector3D normal)` Build a plane normal to a given direction and containing the origin.
`Plane(Vector3D p, Vector3D normal)` Build a plane from a point and a normal.
`Plane(Vector3D p1, Vector3D p2, Vector3D p3)` Build a plane from three points.

### Method Summary

Methods
`boolean` `contains(Vector3D p)` Check if the instance contains a point.
`Plane` `copySelf()` Copy the instance.
`Vector3D` `getNormal()` Get the normalized normal vector.
`double` `getOffset(Plane plane)` Get the offset (oriented distance) of a parallel plane.
`double` `getOffset(Vector<Euclidean3D> point)` Get the offset (oriented distance) of a point.
`Vector3D` `getOrigin()` Get the origin point of the plane frame.
`Vector3D` `getPointAt(Vector2D inPlane, double offset)` Get one point from the 3D-space.
`Vector3D` `getU()` Get the plane first canonical vector.
`Vector3D` `getV()` Get the plane second canonical vector.
`Vector3D` `intersection(Line line)` Get the intersection of a line with the instance.
`Line` `intersection(Plane other)` Build the line shared by the instance and another plane.
`static Vector3D` `intersection(Plane plane1, Plane plane2, Plane plane3)` Get the intersection point of three planes.
`boolean` `isSimilarTo(Plane plane)` Check if the instance is similar to another plane.
`void` `reset(Plane original)` Reset the instance from another one.
`void` `reset(Vector3D p, Vector3D normal)` Reset the instance as if built from a point and a normal.
`void` `revertSelf()` Revert the plane.
`Plane` `rotate(Vector3D center, Rotation rotation)` Rotate the plane around the specified point.
`boolean` `sameOrientationAs(Hyperplane<Euclidean3D> other)` Check if the instance has the same orientation as another hyperplane.
`private void` `setFrame()` Reset the plane frame.
`private void` `setNormal(Vector3D normal)` Set the normal vactor.
`Vector3D` `toSpace(Vector<Euclidean2D> point)` Transform an in-plane point into a 3D space point.
`Vector2D` `toSubSpace(Vector<Euclidean3D> point)` Transform a 3D space point into an in-plane point.
`Plane` `translate(Vector3D translation)` Translate the plane by the specified amount.
`SubPlane` `wholeHyperplane()` Build a region covering the whole hyperplane.
`PolyhedronsSet` `wholeSpace()` Build a region covering the whole space.

### Methods inherited from class java.lang.Object

`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

### Field Detail

#### originOffset

    private double originOffset

Offset of the origin with respect to the plane.

#### origin

    private Vector3D origin

Origin of the plane frame.

#### u

    private Vector3D u

First vector of the plane frame (in plane).

#### v

    private Vector3D v

Second vector of the plane frame (in plane).

#### w

    private Vector3D w

Third vector of the plane frame (plane normal).

### Constructor Detail

#### Plane

    public Plane(Vector3D normal)
          throws MathArithmeticException

Build a plane normal to a given direction and containing the origin.

Parameters:
  `normal` - normal direction to the plane
Throws:
  `MathArithmeticException` - if the normal norm is too small

#### Plane

    public Plane(Vector3D p,
         Vector3D normal)
          throws MathArithmeticException

Build a plane from a point and a normal.

Parameters:
  `p` - point belonging to the plane
  `normal` - normal direction to the plane
Throws:
  `MathArithmeticException` - if the normal norm is too small

#### Plane

    public Plane(Vector3D p1,
         Vector3D p2,
         Vector3D p3)
          throws MathArithmeticException

Build a plane from three points.

The plane is oriented in the direction of `(p2-p1) ^ (p3-p1)`

Parameters:
  `p1` - first point belonging to the plane
  `p2` - second point belonging to the plane
  `p3` - third point belonging to the plane
Throws:
  `MathArithmeticException` - if the points do not constitute a plane

#### Plane

    public Plane(Plane plane)

Copy constructor.

The instance created is completely independant of the original one. A deep copy is used, none of the underlying object are shared.

Parameters:
  `plane` - plane to copy

### Method Detail

#### copySelf

    public Plane 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).

Specified by:
  `copySelf` in interface `Hyperplane<Euclidean3D>`
Returns:
  a new hyperplane, copy of the instance

#### reset

    public void reset(Vector3D p,
             Vector3D normal)
               throws MathArithmeticException

Reset the instance as if built from a point and a normal.

Parameters:
  `p` - point belonging to the plane
  `normal` - normal direction to the plane
Throws:
  `MathArithmeticException` - if the normal norm is too small

#### reset

    public void reset(Plane original)

Reset the instance from another one.

The updated instance is completely independant of the original one. A deep reset is used none of the underlying object is shared.

Parameters:
  `original` - plane to reset from

#### setNormal

    private void setNormal(Vector3D normal)
                    throws MathArithmeticException

Set the normal vactor.

Parameters:
  `normal` - normal direction to the plane (will be copied)
Throws:
  `MathArithmeticException` - if the normal norm is too small

#### setFrame

    private void setFrame()

Reset the plane frame.

#### getOrigin

    public Vector3D getOrigin()

Get the origin point of the plane frame.

The point returned is the orthogonal projection of the 3D-space origin in the plane.

Returns:
  the origin point of the plane frame (point closest to the 3D-space origin)

#### getNormal

    public Vector3D getNormal()

Get the normalized normal vector.

The frame defined by (`getU`, `getV`, `getNormal`) is a rigth-handed orthonormalized frame).

Returns:
  normalized normal vector
See Also:
  `getU()`, `getV()`

#### getU

    public Vector3D getU()

Get the plane first canonical vector.

The frame defined by (`getU`, `getV`, `getNormal`) is a rigth-handed orthonormalized frame).

Returns:
  normalized first canonical vector
See Also:
  `getV()`, `getNormal()`

#### getV

    public Vector3D getV()

Get the plane second canonical vector.

The frame defined by (`getU`, `getV`, `getNormal`) is a rigth-handed orthonormalized frame).

Returns:
  normalized second canonical vector
See Also:
  `getU()`, `getNormal()`

#### revertSelf

    public void revertSelf()

Revert the plane.

Replace the instance by a similar plane with opposite orientation.

The new plane frame is chosen in such a way that a 3D point that had `(x, y)` in-plane coordinates and `z` offset with respect to the plane and is unaffected by the change will have `(y, x)` in-plane coordinates and `-z` offset with respect to the new plane. This means that the `u` and `v` vectors returned by the `getU()` and `getV()` methods are exchanged, and the `w` vector returned by the `getNormal()` method is reversed.

#### toSubSpace

    public Vector2D toSubSpace(Vector<Euclidean3D> point)

Transform a 3D space point into an in-plane point.

Specified by:
  `toSubSpace` in interface `Embedding<Euclidean3D,Euclidean2D>`
Parameters:
  `point` - point of the space (must be a `Vector3D` instance)
Returns:
  in-plane point (really a `Vector2D` instance)
See Also:
  `toSpace(org.apache.commons.math3.geometry.Vector<org.apache.commons.math3.geometry.euclidean.twod.Euclidean2D>)`

#### toSpace

    public Vector3D toSpace(Vector<Euclidean2D> point)

Transform an in-plane point into a 3D space point.

Specified by:
  `toSpace` in interface `Embedding<Euclidean3D,Euclidean2D>`
Parameters:
  `point` - in-plane point (must be a `Vector2D` instance)
Returns:
  3D space point (really a `Vector3D` instance)
See Also:
  `toSubSpace(org.apache.commons.math3.geometry.Vector<org.apache.commons.math3.geometry.euclidean.threed.Euclidean3D>)`

#### getPointAt

    public Vector3D getPointAt(Vector2D inPlane,
                      double offset)

Get one point from the 3D-space.

Parameters:
  `inPlane` - desired in-plane coordinates for the point in the plane
  `offset` - desired offset for the point
Returns:
  one point in the 3D-space, with given coordinates and offset relative to the plane

#### isSimilarTo

    public boolean isSimilarTo(Plane plane)

Check if the instance is similar to another plane.

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

Parameters:
  `plane` - plane to which the instance is compared
Returns:
  true if the planes are similar

#### rotate

    public Plane rotate(Vector3D center,
               Rotation rotation)

Rotate the plane around the specified point.

The instance is not modified, a new instance is created.

Parameters:
  `center` - rotation center
  `rotation` - vectorial rotation operator
Returns:
  a new plane

#### translate

    public Plane translate(Vector3D translation)

Translate the plane by the specified amount.

The instance is not modified, a new instance is created.

Parameters:
  `translation` - translation to apply
Returns:
  a new plane

#### intersection

    public Vector3D intersection(Line line)

Get the intersection of a line with the instance.

Parameters:
  `line` - line intersecting the instance
Returns:
  intersection point between between the line and the instance (null if the line is parallel to the instance)

#### intersection

    public Line intersection(Plane other)

Build the line shared by the instance and another plane.

Parameters:
  `other` - other plane
Returns:
  line at the intersection of the instance and the other plane (really a `Line` instance)

#### intersection

    public static Vector3D intersection(Plane plane1,
                        Plane plane2,
                        Plane plane3)

Get the intersection point of three planes.

Parameters:
  `plane1` - first plane1
  `plane2` - second plane2
  `plane3` - third plane2
Returns:
  intersection point of three planes, null if some planes are parallel

#### wholeHyperplane

    public SubPlane wholeHyperplane()

Build a region covering the whole hyperplane.

Specified by:
  `wholeHyperplane` in interface `Hyperplane<Euclidean3D>`
Returns:
  a region covering the whole hyperplane

#### wholeSpace

    public PolyhedronsSet wholeSpace()

Build a region covering the whole space.

Specified by:
  `wholeSpace` in interface `Hyperplane<Euclidean3D>`
Returns:
  a region containing the instance (really a `PolyhedronsSet` instance)

#### 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 plane

#### getOffset

    public double getOffset(Plane plane)

Get the offset (oriented distance) of a parallel plane.

This method should be called only for parallel planes otherwise the result is not meaningful.

The offset is 0 if both planes are the same, it is positive if the plane is on the plus side of the instance and negative if it is on the minus side, according to its natural orientation.

Parameters:
  `plane` - plane to check
Returns:
  offset of the plane

#### getOffset

    public double getOffset(Vector<Euclidean3D> 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.

Specified by:
  `getOffset` in interface `Hyperplane<Euclidean3D>`
Parameters:
  `point` - point to check
Returns:
  offset of the point

#### sameOrientationAs

    public boolean sameOrientationAs(Hyperplane<Euclidean3D> other)

Check if the instance has the same orientation as another hyperplane.

Specified by:
  `sameOrientationAs` in interface `Hyperplane<Euclidean3D>`
Parameters:
  `other` - other hyperplane to check against the instance
Returns:
  true if the instance and the other hyperplane have the same orientation