math.geom2d.line

Class Ray2D

java.lang.Object

math.geom2d.curve.AbstractContinuousCurve2D

math.geom2d.curve.AbstractSmoothCurve2D

math.geom2d.line.AbstractLine2D

math.geom2d.line.Ray2D

All Implemented Interfaces:

Serializable, Cloneable, CirculinearContinuousCurve2D, CirculinearCurve2D, CirculinearElement2D, CirculinearShape2D, ContinuousCirculinearCurve2D, ContinuousCurve2D, Curve2D, SmoothCurve2D, ContinuousOrientedCurve2D, OrientedCurve2D, SmoothOrientedCurve2D, LinearShape2D, Shape2D

public class Ray2D
extends AbstractLine2D
implements Cloneable

Ray, or half-line, defined from an origin and a direction vector. It is composed of all points satisfying the parametric equation:

x(t) = x0+t*dx
y(t) = y0+t*dy

With t comprised between 0 and +INFINITY.

See Also:

Serialized Form

Field Summary

Fields inherited from class math.geom2d.line.AbstractLine2D

dx, dy, x0, y0

Fields inherited from interface math.geom2d.Shape2D

ACCURACY

Constructor Summary

Constructors

Constructor and Description
Ray2D() Empty constructor for Ray2D.
Ray2D(double x, double y, double angle) Creates a new Ray2D, originating from point (x, y)<\code>, and going in the direction specified by angle<\code> (in radians).
Ray2D(double x1, double y1, double dx, double dy) Creates a new Ray2D, originating from point (x1,y1)<\code>, and going in the direction defined by vector (dx, dy)<\code>.
Ray2D(LinearShape2D line) Define a new Ray, with same characteristics as given object.
Ray2D(Point2D point, double angle) Creates a new Ray2D, originating from point point<\code>, and going in the direction specified by angle<\code> (in radians).
Ray2D(Point2D point, double dx, double dy) Creates a new Ray2D, originating from point point<\code>, and going in the direction defined by vector (dx,dy)<\code>.
Ray2D(Point2D point1, Point2D point2) Creates a new Ray2D, originating from point1<\code>, and going in the direction of point2<\code>.
Ray2D(Point2D point, Vector2D vector) Creates a new Ray2D, originating from point point<\code>, and going in the direction specified by vector<\code>.

Method Summary

Methods

Modifier and Type	Method and Description
GeneralPath	appendPath(GeneralPath path) Throws an infiniteShapeException
Ray2D	clone() Ensures public declaration of clone(), and ensures valid return type.
boolean	contains(double x, double y) Checks if the shape contains the planar point defined by (x,y).
static Ray2D	create(Point2D origin, Point2D target) Static factory for creating a new ray, originating from origin<\code>, and going in the direction of target<\code>.
static Ray2D	create(Point2D origin, Vector2D direction) Static factory for creating a new ray.
boolean	equals(Object obj)
Box2D	getBoundingBox() Returns the bounding box of the shape.
Point2D	getFirstPoint() Get the first point of the curve.
GeneralPath	getGeneralPath() Throws an infiniteShapeException
Ray2D	getParallel(double d) Creates a new curve, formed by the points with parameterization: p(t) = c(t) + d*n(t)/|n(t)|, with p(t) being a point of the original curve, n(t) the normal of the curve, and |n| being the norm of n. In the case of a continuous curve formed by several smooth circulinear elements, the parallels of contiguous elements are joined by a circle arc.
Point2D	getPoint(double t) Gets the point from a parametric representation of the curve.
InvertedRay2D	getReverseCurve() Returns the curve with same trace on the plane with parametrization in reverse order.
double	getT0() Get value of parameter t for the first point of the curve.
double	getT1() Get value of parameter t for the last point of the curve.
boolean	isBounded() Always returns false, because a ray is not bounded.
void	setRay(double x0, double y0, double dx, double dy) Deprecated. lines will become immutable in a future release
void	setRay(Point2D p1, Point2D p2) Deprecated. lines will become immutable in a future release
void	setRay(Point2D point, Vector2D vect) Deprecated. lines will become immutable in a future release
String	toString()
Ray2D	transform(AffineTransform2D trans) Transforms the curve by an affine transform.

Methods inherited from class math.geom2d.line.AbstractLine2D

clip, contains, getBuffer, getCartesianEquation, getContinuousCurves, getCurvature, getDistance, getDistance, getHorizontalAngle, getIntersection, getIntersection, getIntersections, getLength, getLength, getOrigin, getParallel, getParametric, getPerpendicular, getPolarCoefficients, getPosition, getPosition, getPositionOnLine, getPositionOnLine, getProjectedPoint, getProjectedPoint, getSignedDistance, getSignedDistance, getSignedPolarCoefficients, getSmoothPieces, getSubCurve, getSupportingLine, getSymmetric, getSymmetric, getTangent, getVector, getWindingAngle, isClosed, isColinear, isColinear, isEmpty, isInside, isParallel, isParallel, project, supportContains, transform

Methods inherited from class math.geom2d.curve.AbstractSmoothCurve2D

getLeftTangent, getRightTangent, getSingularPoints, isSingular

Methods inherited from class math.geom2d.curve.AbstractContinuousCurve2D

draw, getAsAWTShape, getAsPolyline, getLastPoint, wrapCurve

Methods inherited from class java.lang.Object

finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface math.geom2d.curve.ContinuousCurve2D

getAsPolyline, getLeftTangent, getRightTangent

Methods inherited from interface math.geom2d.curve.Curve2D

draw, getAsAWTShape, getLastPoint, getSingularPoints, isSingular

Constructor Detail

Ray2D

public Ray2D()

Empty constructor for Ray2D. Default is ray starting at origin, and having a slope of 1*dx and 0*dy.

Ray2D

public Ray2D(Point2D point1,
     Point2D point2)

Creates a new Ray2D, originating from point1<\code>, and going in the direction of point2<\code>.

Ray2D

public Ray2D(double x1,
     double y1,
     double dx,
     double dy)

Creates a new Ray2D, originating from point (x1,y1)<\code>, and going in the direction defined by vector (dx, dy)<\code>.

Ray2D

public Ray2D(Point2D point,
     double dx,
     double dy)

Creates a new Ray2D, originating from point point<\code>, and going in the direction defined by vector (dx,dy)<\code>.

Ray2D

public Ray2D(Point2D point,
     Vector2D vector)

Creates a new Ray2D, originating from point point<\code>, and going in the direction specified by vector<\code>.

Ray2D

public Ray2D(Point2D point,
     double angle)

Creates a new Ray2D, originating from point point<\code>, and going in the direction specified by angle<\code> (in radians).

Ray2D

public Ray2D(double x,
     double y,
     double angle)

Creates a new Ray2D, originating from point (x, y)<\code>, and going in the direction specified by angle<\code> (in radians).

Ray2D

public Ray2D(LinearShape2D line)

Define a new Ray, with same characteristics as given object.

Method Detail

create

public static final Ray2D create(Point2D origin,
           Vector2D direction)

Static factory for creating a new ray.

Since:

0.8.1

create

public static final Ray2D create(Point2D origin,
           Point2D target)

Static factory for creating a new ray, originating from origin<\code>, and going in the direction of target<\code>.

Since:

0.8.1

setRay

@Deprecated
public void setRay(double x0,
                     double y0,
                     double dx,
                     double dy)

Deprecated. lines will become immutable in a future release

setRay

@Deprecated
public void setRay(Point2D p1,
                     Point2D p2)

Deprecated. lines will become immutable in a future release

setRay

@Deprecated
public void setRay(Point2D point,
                     Vector2D vect)

Deprecated. lines will become immutable in a future release

getParallel

public Ray2D getParallel(double d)

Description copied from interface: CirculinearCurve2D

Creates a new curve, formed by the points with parameterization: p(t) = c(t) + d*n(t)/|n(t)|, with p(t) being a point of the original curve, n(t) the normal of the curve, and |n| being the norm of n.
In the case of a continuous curve formed by several smooth circulinear elements, the parallels of contiguous elements are joined by a circle arc.

Specified by:

getParallel in interface CirculinearContinuousCurve2D

Specified by:

getParallel in interface CirculinearCurve2D

Specified by:

getParallel in interface CirculinearElement2D

Specified by:

getParallel in interface ContinuousCirculinearCurve2D

Parameters:

d - the distance between the original curve and he parallel curve.

Returns:

the parallel curve

appendPath

public GeneralPath appendPath(GeneralPath path)

Throws an infiniteShapeException

Specified by:

appendPath in interface ContinuousCurve2D

Parameters:

path - a path to modify

Returns:

the modified path

getGeneralPath

public GeneralPath getGeneralPath()

Throws an infiniteShapeException

getFirstPoint

public Point2D getFirstPoint()

Description copied from interface: Curve2D

Get the first point of the curve. It must returns the same result as getPoint(getT0()).

Specified by:

getFirstPoint in interface Curve2D

Overrides:

getFirstPoint in class AbstractContinuousCurve2D

Returns:

the first point of the curve

getPoint

public Point2D getPoint(double t)

Description copied from interface: Curve2D

Gets the point from a parametric representation of the curve. If the parameter lies outside the definition range, the parameter corresponding to the closest bound is used instead. This method can be used to draw an approximated outline of a curve, by selecting multiple values for t and drawing lines between them.

Specified by:

getPoint in interface Curve2D

getT0

public double getT0()

Description copied from interface: Curve2D

Get value of parameter t for the first point of the curve. It can be -Infinity, in this case the piece of curve is not bounded.

Specified by:

getT0 in interface Curve2D

getT1

public double getT1()

Description copied from interface: Curve2D

Get value of parameter t for the last point of the curve. It can be +Infinity, in this case the piece of curve is not bounded.

Specified by:

getT1 in interface Curve2D

getReverseCurve

public InvertedRay2D getReverseCurve()

Description copied from interface: Curve2D

Returns the curve with same trace on the plane with parametrization in reverse order.

Specified by:

getReverseCurve in interface CirculinearContinuousCurve2D

Specified by:

getReverseCurve in interface CirculinearCurve2D

Specified by:

getReverseCurve in interface CirculinearElement2D

Specified by:

getReverseCurve in interface ContinuousCirculinearCurve2D

Specified by:

getReverseCurve in interface ContinuousCurve2D

Specified by:

getReverseCurve in interface Curve2D

Specified by:

getReverseCurve in interface SmoothCurve2D

Specified by:

getReverseCurve in interface ContinuousOrientedCurve2D

Specified by:

getReverseCurve in interface OrientedCurve2D

Specified by:

getReverseCurve in interface SmoothOrientedCurve2D

isBounded

public boolean isBounded()

Always returns false, because a ray is not bounded.

Specified by:

isBounded in interface Shape2D

contains

public boolean contains(double x,
               double y)

Description copied from interface: Shape2D

Checks if the shape contains the planar point defined by (x,y).

Specified by:

contains in interface Shape2D

getBoundingBox

public Box2D getBoundingBox()

Description copied from interface: Shape2D

Returns the bounding box of the shape.

Specified by:

getBoundingBox in interface Shape2D

Returns:

the bounding box of the shape.

transform

public Ray2D transform(AffineTransform2D trans)

Description copied from interface: Curve2D

Transforms the curve by an affine transform. The result is an instance of Curve2D.

Specified by:

transform in interface ContinuousCurve2D

Specified by:

transform in interface Curve2D

Specified by:

transform in interface SmoothCurve2D

Specified by:

transform in interface ContinuousOrientedCurve2D

Specified by:

transform in interface OrientedCurve2D

Specified by:

transform in interface SmoothOrientedCurve2D

Specified by:

transform in interface LinearShape2D

Specified by:

transform in interface Shape2D

Specified by:

transform in class AbstractLine2D

Parameters:

trans - an affine transform

Returns:

the transformed shape

toString

public String toString()

Overrides:

toString in class Object

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

clone

public Ray2D clone()

Description copied from class: AbstractLine2D

Ensures public declaration of clone(), and ensures valid return type.

Specified by:

clone in interface Curve2D

Specified by:

clone in class AbstractLine2D

Returns:

the cloned curve