math.geom2d.line

Class LineSegment2D

java.lang.Object

math.geom2d.curve.AbstractContinuousCurve2D

math.geom2d.curve.AbstractSmoothCurve2D

math.geom2d.line.AbstractLine2D

math.geom2d.line.LineSegment2D

All Implemented Interfaces:

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

public class LineSegment2D
extends AbstractLine2D
implements Cloneable, CirculinearElement2D

Line segment, defined as the set of points located between the two end points.

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
LineSegment2D(double x1, double y1, double x2, double y2) Define a new Edge with two extremities.
LineSegment2D(Point2D point1, Point2D point2) Define a new Edge with two extremities.

Method Summary

Methods

Modifier and Type	Method and Description
GeneralPath	appendPath(GeneralPath path) Appends a line to the current path.
LineSegment2D	clone() Ensures public declaration of clone(), and ensures valid return type.
boolean	contains(double xp, double yp) Checks if the shape contains the planar point defined by (x,y).
static LineSegment2D	create(Point2D p1, Point2D p2) Static factory for creating a new line segment between two points.
boolean	equals(Object obj)
Box2D	getBoundingBox() Returns the bounding box of the shape.
double	getDistance(double x, double y) Get the distance of the point (x, y) to this edge.
static double	getEdgeAngle(LineSegment2D edge1, LineSegment2D edge2) Returns angle between two edges sharing one vertex.
Point2D	getFirstPoint() Return the first point of the edge.
GeneralPath	getGeneralPath() deprecated
Point2D	getLastPoint() Return the last point of the edge.
double	getLength() Returns the length of the line segment.
StraightLine2D	getMedian() Return the median of the edge, that is the locus of points located at equal distance of each vertex.
static StraightLine2D	getMedian(LineSegment2D edge)
Point2D	getOtherPoint(Point2D point) Return the opposite vertex of the edge.
LineSegment2D	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.
LineSegment2D	getReverseCurve() Returns the LineSegment which start from last point of this line segment, and which ends at the fist point of this last segment.
double	getSignedDistance(double x, double y) Get the signed distance of the StraightObject2d to the given point.
double	getT0() Returns the parameter of the first point of the edge, equals to 0.
double	getT1() Returns the parameter of the last point of the edge, equals to 1.
static boolean	intersects(LineSegment2D edge1, LineSegment2D edge2) Checks if two line segment intersect.
boolean	isBounded() Returns true
void	setLineSegment(double x1, double y1, double x2, double y2) Deprecated. lines will become immutable in a future release
void	setLineSegment(Point2D p1, Point2D p2) Deprecated. lines will become immutable in a future release
String	toString()
LineSegment2D	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, getHorizontalAngle, getIntersection, getIntersection, getIntersections, getLength, getOrigin, getParallel, getParametric, getPerpendicular, getPolarCoefficients, getPosition, getPosition, getPositionOnLine, getPositionOnLine, getProjectedPoint, getProjectedPoint, 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, wrapCurve

Methods inherited from class java.lang.Object

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

Methods inherited from interface math.geom2d.circulinear.CirculinearElement2D

clip, getSubCurve, transform

Methods inherited from interface math.geom2d.circulinear.CirculinearContinuousCurve2D

getSmoothPieces

Methods inherited from interface math.geom2d.circulinear.CirculinearCurve2D

getContinuousCurves, getLength, getPosition

Methods inherited from interface math.geom2d.circulinear.CirculinearShape2D

getBuffer

Methods inherited from interface math.geom2d.curve.ContinuousCurve2D

getAsPolyline, getLeftTangent, getRightTangent, isClosed

Methods inherited from interface math.geom2d.domain.OrientedCurve2D

getSignedDistance, getWindingAngle, isInside

Methods inherited from interface math.geom2d.curve.Curve2D

draw, getAsAWTShape, getIntersections, getPosition, getSingularPoints, isSingular, project

Methods inherited from interface math.geom2d.Shape2D

contains, getDistance, isEmpty

Methods inherited from interface math.geom2d.curve.SmoothCurve2D

getCurvature, getTangent

Constructor Detail

LineSegment2D

public LineSegment2D(Point2D point1,
             Point2D point2)

Define a new Edge with two extremities.

LineSegment2D

public LineSegment2D(double x1,
             double y1,
             double x2,
             double y2)

Define a new Edge with two extremities.

Method Detail

create

public static final LineSegment2D create(Point2D p1,
                   Point2D p2)

Static factory for creating a new line segment between two points.

Since:

0.8.1

getMedian

public static final StraightLine2D getMedian(LineSegment2D edge)

getEdgeAngle

public static final double getEdgeAngle(LineSegment2D edge1,
                  LineSegment2D edge2)

Returns angle between two edges sharing one vertex.

intersects

public static final boolean intersects(LineSegment2D edge1,
                 LineSegment2D edge2)

Checks if two line segment intersect. Uses the Point2D.ccw() method, which is based on Sedgewick algorithm.

Parameters:

edge1 - a line segment

edge2 - a line segment

Returns:

true if the 2 line segments intersect

getOtherPoint

public Point2D getOtherPoint(Point2D point)

Return the opposite vertex of the edge.

Parameters:

point - one of the vertices of the edge

Returns:

the other vertex, or null if point is nor a vertex of the edge

getMedian

public StraightLine2D getMedian()

Return the median of the edge, that is the locus of points located at equal distance of each vertex.

setLineSegment

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

Deprecated. lines will become immutable in a future release

setLineSegment

@Deprecated
public void setLineSegment(double x1,
                             double y1,
                             double x2,
                             double y2)

Deprecated. lines will become immutable in a future release

getLength

public double getLength()

Returns the length of the line segment.

Specified by:

getLength in interface CirculinearCurve2D

Overrides:

getLength in class AbstractLine2D

Returns:

the length of the curve

getParallel

public LineSegment2D 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

getSignedDistance

public double getSignedDistance(double x,
                       double y)

Description copied from class: AbstractLine2D

Get the signed distance of the StraightObject2d to the given point. The signed distance is positive if point lies 'to the right' of the line, when moving in the direction given by direction vector. This method is not designed to be used directly, because AbstractLine2D is an abstract class, but it can be used by subclasses to help computations.

Specified by:

getSignedDistance in interface OrientedCurve2D

Overrides:

getSignedDistance in class AbstractLine2D

Parameters:

x - x-coord of a point

y - y-coord of a point

Returns:

the signed distance of the point (x,y) to the curve

getFirstPoint

public Point2D getFirstPoint()

Return the first point of the edge.

Specified by:

getFirstPoint in interface Curve2D

Overrides:

getFirstPoint in class AbstractContinuousCurve2D

Returns:

the first point of the edge

getLastPoint

public Point2D getLastPoint()

Return the last point of the edge.

Specified by:

getLastPoint in interface Curve2D

Overrides:

getLastPoint in class AbstractContinuousCurve2D

Returns:

the last point of the edge

getT0

public double getT0()

Returns the parameter of the first point of the edge, equals to 0.

Specified by:

getT0 in interface Curve2D

getT1

public double getT1()

Returns the parameter of the last point of the edge, equals to 1.

Specified by:

getT1 in interface Curve2D

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

getReverseCurve

public LineSegment2D getReverseCurve()

Returns the LineSegment which start from last point of this line segment, and which ends at the fist point of this last segment.

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()

Returns true

Specified by:

isBounded in interface Shape2D

contains

public boolean contains(double xp,
               double yp)

Description copied from interface: Shape2D

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

Specified by:

contains in interface Shape2D

getDistance

public double getDistance(double x,
                 double y)

Get the distance of the point (x, y) to this edge.

Specified by:

getDistance in interface Shape2D

Overrides:

getDistance in class AbstractLine2D

Parameters:

x - x-coordinate of the point

y - y-coordinate of the point

Returns:

distance between this object and the point (x,y)

transform

public LineSegment2D 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

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.

appendPath

public GeneralPath appendPath(GeneralPath path)

Appends a line to the current path.

Specified by:

appendPath in interface ContinuousCurve2D

Parameters:

path - the path to modify

Returns:

the modified path

getGeneralPath

public GeneralPath getGeneralPath()

deprecated

toString

public String toString()

Overrides:

toString in class Object

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

clone

public LineSegment2D 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