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Showing content from https://docs.oracle.com/en/java/javase/19/docs/api/java.desktop/java/awt/geom/Line2D.html below:

Line2D (Java SE 19 & JDK 19)

All Implemented Interfaces:

Shape, Cloneable

Direct Known Subclasses:

Line2D.Double, Line2D.Float

This

represents a line segment in

coordinate space.

This class is only the abstract superclass for all objects that store a 2D line segment. The actual storage representation of the coordinates is left to the subclass.

Since:

1.2

• Nested Class Summary

  Nested Classes

  static class 

  A line segment specified with double coordinates.

  static class 

  A line segment specified with float coordinates.

• Constructor Summary

  Constructors

  protected

  This is an abstract class that cannot be instantiated directly.

• Method Summary

  Creates a new object of the same class as this object.

  boolean

  Tests if a specified coordinate is inside the boundary of this Line2D.

  boolean

  contains(double x, double y, double w, double h)

  Tests if the interior of this Line2D entirely contains the specified set of rectangular coordinates.

  boolean

  Tests if a given Point2D is inside the boundary of this Line2D.

  boolean

  Tests if the interior of this Line2D entirely contains the specified Rectangle2D.

  Returns an integer

  Rectangle

  that completely encloses the

  Shape

  .

  Returns the start Point2D of this Line2D.

  Returns the end Point2D of this Line2D.

  Returns an iteration object that defines the boundary of this Line2D.

  Returns an iteration object that defines the boundary of this flattened Line2D.

  abstract double

  Returns the X coordinate of the start point in double precision.

  abstract double

  Returns the X coordinate of the end point in double precision.

  abstract double

  Returns the Y coordinate of the start point in double precision.

  abstract double

  Returns the Y coordinate of the end point in double precision.

  boolean

  intersects(double x, double y, double w, double h)

  Tests if the interior of the Shape intersects the interior of a specified rectangular area.

  boolean

  Tests if the interior of the Shape intersects the interior of a specified Rectangle2D.

  boolean

  Tests if the line segment from (x1,y1) to (x2,y2) intersects this line segment.

  boolean

  Tests if the specified line segment intersects this line segment.

  static boolean

  linesIntersect(double x1, double y1, double x2, double y2, double x3, double y3, double x4, double y4)

  Tests if the line segment from (x1,y1) to (x2,y2) intersects the line segment from (x3,y3) to (x4,y4).

  double

  Returns the distance from a point to this line.

  static double

  ptLineDist(double x1, double y1, double x2, double y2, double px, double py)

  Returns the distance from a point to a line.

  double

  Returns the distance from a Point2D to this line.

  double

  Returns the square of the distance from a point to this line.

  static double

  ptLineDistSq(double x1, double y1, double x2, double y2, double px, double py)

  Returns the square of the distance from a point to a line.

  double

  Returns the square of the distance from a specified Point2D to this line.

  double

  Returns the distance from a point to this line segment.

  static double

  ptSegDist(double x1, double y1, double x2, double y2, double px, double py)

  Returns the distance from a point to a line segment.

  double

  Returns the distance from a Point2D to this line segment.

  double

  Returns the square of the distance from a point to this line segment.

  static double

  ptSegDistSq(double x1, double y1, double x2, double y2, double px, double py)

  Returns the square of the distance from a point to a line segment.

  double

  Returns the square of the distance from a Point2D to this line segment.

  int

  Returns an indicator of where the specified point (px,py) lies with respect to this line segment.

  static int

  relativeCCW(double x1, double y1, double x2, double y2, double px, double py)

  Returns an indicator of where the specified point (px,py) lies with respect to the line segment from (x1,y1) to (x2,y2).

  int

  Returns an indicator of where the specified Point2D lies with respect to this line segment.

  abstract void

  setLine(double x1, double y1, double x2, double y2)

  Sets the location of the end points of this Line2D to the specified double coordinates.

  void

  Sets the location of the end points of this Line2D to the same as those end points of the specified Line2D.

  void

  Sets the location of the end points of this Line2D to the specified Point2D coordinates.

• Constructor Details
  • Line2D

    protected Line2D()

    This is an abstract class that cannot be instantiated directly. Type-specific implementation subclasses are available for instantiation and provide a number of formats for storing the information necessary to satisfy the various accessory methods below.

    Since:

    1.2

    See Also:

    • Line2D.Float
    • Line2D.Double

• Method Details
  • getX1

    public abstract double getX1()

    Returns the X coordinate of the start point in double precision.

    Returns:

    the X coordinate of the start point of this Line2D object.

    Since:

    1.2

  • getY1

    public abstract double getY1()

    Returns the Y coordinate of the start point in double precision.

    Returns:

    the Y coordinate of the start point of this Line2D object.

    Since:

    1.2

  • getP1

    Returns the start Point2D of this Line2D.

    Returns:

    the start Point2D of this Line2D.

    Since:

    1.2

  • getX2

    public abstract double getX2()

    Returns the X coordinate of the end point in double precision.

    Returns:

    the X coordinate of the end point of this Line2D object.

    Since:

    1.2

  • getY2

    public abstract double getY2()

    Returns the Y coordinate of the end point in double precision.

    Returns:

    the Y coordinate of the end point of this Line2D object.

    Since:

    1.2

  • getP2

    Returns the end Point2D of this Line2D.

    Returns:

    the end Point2D of this Line2D.

    Since:

    1.2

  • setLine

    public abstract void setLine(double x1, double y1, double x2, double y2)

    Sets the location of the end points of this Line2D to the specified double coordinates.

    Parameters:

    x1 - the X coordinate of the start point

    y1 - the Y coordinate of the start point

    x2 - the X coordinate of the end point

    y2 - the Y coordinate of the end point

    Since:

    1.2

  • setLine

    Sets the location of the end points of this Line2D to the specified Point2D coordinates.

    Parameters:

    p1 - the start Point2D of the line segment

    p2 - the end Point2D of the line segment

    Since:

    1.2

  • setLine

    Sets the location of the end points of this Line2D to the same as those end points of the specified Line2D.

    Parameters:

    l - the specified Line2D

    Since:

    1.2

  • relativeCCW

    public static int relativeCCW(double x1, double y1, double x2, double y2, double px, double py)

    Returns an indicator of where the specified point

    (px,py)

    lies with respect to the line segment from

    (x1,y1)

    to

    (x2,y2)

    . The return value can be either 1, -1, or 0 and indicates in which direction the specified line must pivot around its first end point,

    (x1,y1)

    , in order to point at the specified point

    (px,py)

    .

    A return value of 1 indicates that the line segment must turn in the direction that takes the positive X axis towards the negative Y axis. In the default coordinate system used by Java 2D, this direction is counterclockwise.

    A return value of -1 indicates that the line segment must turn in the direction that takes the positive X axis towards the positive Y axis. In the default coordinate system, this direction is clockwise.

    A return value of 0 indicates that the point lies exactly on the line segment. Note that an indicator value of 0 is rare and not useful for determining collinearity because of floating point rounding issues.

    If the point is colinear with the line segment, but not between the end points, then the value will be -1 if the point lies "beyond (x1,y1)" or 1 if the point lies "beyond (x2,y2)".

    Parameters:

    x1 - the X coordinate of the start point of the specified line segment

    y1 - the Y coordinate of the start point of the specified line segment

    x2 - the X coordinate of the end point of the specified line segment

    y2 - the Y coordinate of the end point of the specified line segment

    px - the X coordinate of the specified point to be compared with the specified line segment

    py - the Y coordinate of the specified point to be compared with the specified line segment

    Returns:

    an integer that indicates the position of the third specified coordinates with respect to the line segment formed by the first two specified coordinates.

    Since:

    1.2

  • relativeCCW

    public int relativeCCW(double px, double py)

    Parameters:

    px - the X coordinate of the specified point to be compared with this Line2D

    py - the Y coordinate of the specified point to be compared with this Line2D

    Returns:

    an integer that indicates the position of the specified coordinates with respect to this Line2D

    Since:

    1.2

    See Also:

    • relativeCCW(double, double, double, double, double, double)

  • relativeCCW

    Parameters:

    p - the specified Point2D to be compared with this Line2D

    Returns:

    an integer that indicates the position of the specified Point2D with respect to this Line2D

    Since:

    1.2

    See Also:

    • relativeCCW(double, double, double, double, double, double)

  • linesIntersect

    public static boolean linesIntersect(double x1, double y1, double x2, double y2, double x3, double y3, double x4, double y4)

    Tests if the line segment from (x1,y1) to (x2,y2) intersects the line segment from (x3,y3) to (x4,y4).

    Parameters:

    x1 - the X coordinate of the start point of the first specified line segment

    y1 - the Y coordinate of the start point of the first specified line segment

    x2 - the X coordinate of the end point of the first specified line segment

    y2 - the Y coordinate of the end point of the first specified line segment

    x3 - the X coordinate of the start point of the second specified line segment

    y3 - the Y coordinate of the start point of the second specified line segment

    x4 - the X coordinate of the end point of the second specified line segment

    y4 - the Y coordinate of the end point of the second specified line segment

    Returns:

    true if the first specified line segment and the second specified line segment intersect each other; false otherwise.

    Since:

    1.2

  • intersectsLine

    public boolean intersectsLine(double x1, double y1, double x2, double y2)

    Tests if the line segment from (x1,y1) to (x2,y2) intersects this line segment.

    Parameters:

    x1 - the X coordinate of the start point of the specified line segment

    y1 - the Y coordinate of the start point of the specified line segment

    x2 - the X coordinate of the end point of the specified line segment

    y2 - the Y coordinate of the end point of the specified line segment

    Returns:

    true if this line segment and the specified line segment intersect each other; false otherwise.

    Since:

    1.2

  • intersectsLine public boolean intersectsLine(Line2D l)

    Tests if the specified line segment intersects this line segment.

    Parameters:

    l - the specified Line2D

    Returns:

    true if this line segment and the specified line segment intersect each other; false otherwise.

    Since:

    1.2

  • ptSegDistSq

    public static double ptSegDistSq(double x1, double y1, double x2, double y2, double px, double py)

    Returns the square of the distance from a point to a line segment. The distance measured is the distance between the specified point and the closest point between the specified end points. If the specified point intersects the line segment in between the end points, this method returns 0.0.

    Parameters:

    x1 - the X coordinate of the start point of the specified line segment

    y1 - the Y coordinate of the start point of the specified line segment

    x2 - the X coordinate of the end point of the specified line segment

    y2 - the Y coordinate of the end point of the specified line segment

    px - the X coordinate of the specified point being measured against the specified line segment

    py - the Y coordinate of the specified point being measured against the specified line segment

    Returns:

    a double value that is the square of the distance from the specified point to the specified line segment.

    Since:

    1.2

    See Also:

    • ptLineDistSq(double, double, double, double, double, double)

  • ptSegDist

    public static double ptSegDist(double x1, double y1, double x2, double y2, double px, double py)

    Returns the distance from a point to a line segment. The distance measured is the distance between the specified point and the closest point between the specified end points. If the specified point intersects the line segment in between the end points, this method returns 0.0.

    Parameters:

    x1 - the X coordinate of the start point of the specified line segment

    y1 - the Y coordinate of the start point of the specified line segment

    x2 - the X coordinate of the end point of the specified line segment

    y2 - the Y coordinate of the end point of the specified line segment

    px - the X coordinate of the specified point being measured against the specified line segment

    py - the Y coordinate of the specified point being measured against the specified line segment

    Returns:

    a double value that is the distance from the specified point to the specified line segment.

    Since:

    1.2

    See Also:

    • ptLineDist(double, double, double, double, double, double)

  • ptSegDistSq

    public double ptSegDistSq(double px, double py)

    Returns the square of the distance from a point to this line segment. The distance measured is the distance between the specified point and the closest point between the current line's end points. If the specified point intersects the line segment in between the end points, this method returns 0.0.

    Parameters:

    px - the X coordinate of the specified point being measured against this line segment

    py - the Y coordinate of the specified point being measured against this line segment

    Returns:

    a double value that is the square of the distance from the specified point to the current line segment.

    Since:

    1.2

    See Also:

    • ptLineDistSq(double, double)

  • ptSegDistSq public double ptSegDistSq(Point2D pt)

    Returns the square of the distance from a Point2D to this line segment. The distance measured is the distance between the specified point and the closest point between the current line's end points. If the specified point intersects the line segment in between the end points, this method returns 0.0.

    Parameters:

    pt - the specified Point2D being measured against this line segment.

    Returns:

    a double value that is the square of the distance from the specified Point2D to the current line segment.

    Since:

    1.2

    See Also:

    • ptLineDistSq(Point2D)

  • ptSegDist

    public double ptSegDist(double px, double py)

    Returns the distance from a point to this line segment. The distance measured is the distance between the specified point and the closest point between the current line's end points. If the specified point intersects the line segment in between the end points, this method returns 0.0.

    Parameters:

    px - the X coordinate of the specified point being measured against this line segment

    py - the Y coordinate of the specified point being measured against this line segment

    Returns:

    a double value that is the distance from the specified point to the current line segment.

    Since:

    1.2

    See Also:

    • ptLineDist(double, double)

  • ptSegDist public double ptSegDist(Point2D pt)

    Returns the distance from a Point2D to this line segment. The distance measured is the distance between the specified point and the closest point between the current line's end points. If the specified point intersects the line segment in between the end points, this method returns 0.0.

    Parameters:

    pt - the specified Point2D being measured against this line segment

    Returns:

    a double value that is the distance from the specified Point2D to the current line segment.

    Since:

    1.2

    See Also:

    • ptLineDist(Point2D)

  • ptLineDistSq

    public static double ptLineDistSq(double x1, double y1, double x2, double y2, double px, double py)

    Returns the square of the distance from a point to a line. The distance measured is the distance between the specified point and the closest point on the infinitely-extended line defined by the specified coordinates. If the specified point intersects the line, this method returns 0.0.

    Parameters:

    x1 - the X coordinate of the start point of the specified line

    y1 - the Y coordinate of the start point of the specified line

    x2 - the X coordinate of the end point of the specified line

    y2 - the Y coordinate of the end point of the specified line

    px - the X coordinate of the specified point being measured against the specified line

    py - the Y coordinate of the specified point being measured against the specified line

    Returns:

    a double value that is the square of the distance from the specified point to the specified line.

    Since:

    1.2

    See Also:

    • ptSegDistSq(double, double, double, double, double, double)

  • ptLineDist

    public static double ptLineDist(double x1, double y1, double x2, double y2, double px, double py)

    Returns the distance from a point to a line. The distance measured is the distance between the specified point and the closest point on the infinitely-extended line defined by the specified coordinates. If the specified point intersects the line, this method returns 0.0.

    Parameters:

    x1 - the X coordinate of the start point of the specified line

    y1 - the Y coordinate of the start point of the specified line

    x2 - the X coordinate of the end point of the specified line

    y2 - the Y coordinate of the end point of the specified line

    px - the X coordinate of the specified point being measured against the specified line

    py - the Y coordinate of the specified point being measured against the specified line

    Returns:

    a double value that is the distance from the specified point to the specified line.

    Since:

    1.2

    See Also:

    • ptSegDist(double, double, double, double, double, double)

  • ptLineDistSq

    public double ptLineDistSq(double px, double py)

    Returns the square of the distance from a point to this line. The distance measured is the distance between the specified point and the closest point on the infinitely-extended line defined by this Line2D. If the specified point intersects the line, this method returns 0.0.

    Parameters:

    px - the X coordinate of the specified point being measured against this line

    py - the Y coordinate of the specified point being measured against this line

    Returns:

    a double value that is the square of the distance from a specified point to the current line.

    Since:

    1.2

    See Also:

    • ptSegDistSq(double, double)

  • ptLineDistSq public double ptLineDistSq(Point2D pt)

    Returns the square of the distance from a specified Point2D to this line. The distance measured is the distance between the specified point and the closest point on the infinitely-extended line defined by this Line2D. If the specified point intersects the line, this method returns 0.0.

    Parameters:

    pt - the specified Point2D being measured against this line

    Returns:

    a double value that is the square of the distance from a specified Point2D to the current line.

    Since:

    1.2

    See Also:

    • ptSegDistSq(Point2D)

  • ptLineDist

    public double ptLineDist(double px, double py)

    Returns the distance from a point to this line. The distance measured is the distance between the specified point and the closest point on the infinitely-extended line defined by this Line2D. If the specified point intersects the line, this method returns 0.0.

    Parameters:

    px - the X coordinate of the specified point being measured against this line

    py - the Y coordinate of the specified point being measured against this line

    Returns:

    a double value that is the distance from a specified point to the current line.

    Since:

    1.2

    See Also:

    • ptSegDist(double, double)

  • ptLineDist public double ptLineDist(Point2D pt)

    Returns the distance from a Point2D to this line. The distance measured is the distance between the specified point and the closest point on the infinitely-extended line defined by this Line2D. If the specified point intersects the line, this method returns 0.0.

    Parameters:

    pt - the specified Point2D being measured

    Returns:

    a double value that is the distance from a specified Point2D to the current line.

    Since:

    1.2

    See Also:

    • ptSegDist(Point2D)

  • contains

    public boolean contains(double x, double y)

    Tests if a specified coordinate is inside the boundary of this

    Line2D

    . This method is required to implement the

    Shape

    interface, but in the case of

    Line2D

    objects it always returns

    false

    since a line contains no area.

    Specified by:

    contains in interface Shape

    Parameters:

    x - the X coordinate of the specified point to be tested

    y - the Y coordinate of the specified point to be tested

    Returns:

    false because a Line2D contains no area.

    Since:

    1.2

  • contains

    Tests if a given

    Point2D

    is inside the boundary of this

    Line2D

    . This method is required to implement the

    Shape

    interface, but in the case of

    Line2D

    objects it always returns

    false

    since a line contains no area.

    Specified by:

    contains in interface Shape

    Parameters:

    p - the specified Point2D to be tested

    Returns:

    false because a Line2D contains no area.

    Since:

    1.2

  • intersects

    public boolean intersects(double x, double y, double w, double h)

    Tests if the interior of the

    Shape

    intersects the interior of a specified rectangular area. The rectangular area is considered to intersect the

    Shape

    if any point is contained in both the interior of the

    Shape

    and the specified rectangular area.

    The Shape.intersects() method allows a Shape implementation to conservatively return true when:

    • there is a high probability that the rectangular area and the Shape intersect, but
    • the calculations to accurately determine this intersection are prohibitively expensive.

    This means that for some

    Shapes

    this method might return

    true

    even though the rectangular area does not intersect the

    Shape

    . The

    Area

    class performs more accurate computations of geometric intersection than most

    Shape

    objects and therefore can be used if a more precise answer is required.

    Specified by:

    intersects in interface Shape

    Parameters:

    x - the X coordinate of the upper-left corner of the specified rectangular area

    y - the Y coordinate of the upper-left corner of the specified rectangular area

    w - the width of the specified rectangular area

    h - the height of the specified rectangular area

    Returns:

    true if the interior of the Shape and the interior of the rectangular area intersect, or are both highly likely to intersect and intersection calculations would be too expensive to perform; false otherwise.

    Since:

    1.2

    See Also:

    • Area

  • intersects

    Tests if the interior of the

    Shape

    intersects the interior of a specified

    Rectangle2D

    . The

    Shape.intersects()

    method allows a

    Shape

    implementation to conservatively return

    true

    when:

    • there is a high probability that the Rectangle2D and the Shape intersect, but
    • the calculations to accurately determine this intersection are prohibitively expensive.

    This means that for some

    Shapes

    this method might return

    true

    even though the

    Rectangle2D

    does not intersect the

    Shape

    . The

    Area

    class performs more accurate computations of geometric intersection than most

    Shape

    objects and therefore can be used if a more precise answer is required.

    Specified by:

    intersects in interface Shape

    Parameters:

    r - the specified Rectangle2D

    Returns:

    true if the interior of the Shape and the interior of the specified Rectangle2D intersect, or are both highly likely to intersect and intersection calculations would be too expensive to perform; false otherwise.

    Since:

    1.2

    See Also:

    • Shape.intersects(double, double, double, double)

  • contains

    public boolean contains(double x, double y, double w, double h)

    Tests if the interior of this Line2D entirely contains the specified set of rectangular coordinates. This method is required to implement the Shape interface, but in the case of Line2D objects it always returns false since a line contains no area.

    Specified by:

    contains in interface Shape

    Parameters:

    x - the X coordinate of the upper-left corner of the specified rectangular area

    y - the Y coordinate of the upper-left corner of the specified rectangular area

    w - the width of the specified rectangular area

    h - the height of the specified rectangular area

    Returns:

    false because a Line2D contains no area.

    Since:

    1.2

    See Also:

    • Area
    • Shape.intersects(double, double, double, double)

  • contains

    Tests if the interior of this Line2D entirely contains the specified Rectangle2D. This method is required to implement the Shape interface, but in the case of Line2D objects it always returns false since a line contains no area.

    Specified by:

    contains in interface Shape

    Parameters:

    r - the specified Rectangle2D to be tested

    Returns:

    false because a Line2D contains no area.

    Since:

    1.2

    See Also:

    • Shape.contains(double, double, double, double)

  • getBounds

    Returns an integer

    Rectangle

    that completely encloses the

    Shape

    . Note that there is no guarantee that the returned

    Rectangle

    is the smallest bounding box that encloses the

    Shape

    , only that the

    Shape

    lies entirely within the indicated

    Rectangle

    . The returned

    Rectangle

    might also fail to completely enclose the

    Shape

    if the

    Shape

    overflows the limited range of the integer data type. The

    getBounds2D

    method generally returns a tighter bounding box due to its greater flexibility in representation.

    Note that the definition of insideness can lead to situations where points on the defining outline of the shape may not be considered contained in the returned bounds object, but only in cases where those points are also not considered contained in the original shape.

    If a point is inside the shape according to the contains(point) method, then it must be inside the returned Rectangle bounds object according to the contains(point) method of the bounds. Specifically:

    shape.contains(x,y) requires bounds.contains(x,y)

    If a point is not inside the shape, then it might still be contained in the bounds object:

    bounds.contains(x,y) does not imply shape.contains(x,y)

    Specified by:

    getBounds in interface Shape

    Returns:

    an integer Rectangle that completely encloses the Shape.

    Since:

    1.2

    See Also:

    • Shape.getBounds2D()

  • getPathIterator

    Returns an iteration object that defines the boundary of this Line2D. The iterator for this class is not multi-threaded safe, which means that this Line2D class does not guarantee that modifications to the geometry of this Line2D object do not affect any iterations of that geometry that are already in process.

    Specified by:

    getPathIterator in interface Shape

    Parameters:

    at - the specified AffineTransform

    Returns:

    a PathIterator that defines the boundary of this Line2D.

    Since:

    1.2

  • getPathIterator

    Returns an iteration object that defines the boundary of this flattened Line2D. The iterator for this class is not multi-threaded safe, which means that this Line2D class does not guarantee that modifications to the geometry of this Line2D object do not affect any iterations of that geometry that are already in process.

    Specified by:

    getPathIterator in interface Shape

    Parameters:

    at - the specified AffineTransform

    flatness - the maximum amount that the control points for a given curve can vary from colinear before a subdivided curve is replaced by a straight line connecting the end points. Since a Line2D object is always flat, this parameter is ignored.

    Returns:

    a PathIterator that defines the boundary of the flattened Line2D

    Since:

    1.2

  • clone

    Creates a new object of the same class as this object.

    Overrides:

    clone in class Object

    Returns:

    a clone of this instance.

    Throws:

    OutOfMemoryError - if there is not enough memory.

    Since:

    1.2

    See Also:

    • Cloneable

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