Class Point2D



  • public class Point2D
    extends Object
    A 2D geometric point that usually represents the x, y coordinates. It can also represent a relative magnitude vector's x, y magnitudes.
    Since:
    JavaFX 2.0
    • Field Summary

      Fields 
      Modifier and Type Field Description
      static Point2D ZERO
      Point or vector with both coordinates set to 0.
    • Constructor Summary

      Constructors 
      Constructor Description
      Point2D​(double x, double y)
      Creates a new instance of Point2D.
    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      Point2D add​(double x, double y)
      Returns a point with the specified coordinates added to the coordinates of this point.
      Point2D add​(Point2D point)
      Returns a point with the coordinates of the specified point added to the coordinates of this point.
      double angle​(double x, double y)
      Computes the angle (in degrees) between the vector represented by this point and the specified vector.
      double angle​(Point2D point)
      Computes the angle (in degrees) between the vector represented by this point and the vector represented by the specified point.
      double angle​(Point2D p1, Point2D p2)
      Computes the angle (in degrees) between the three points with this point as a vertex.
      Point3D crossProduct​(double x, double y)
      Computes cross product of the vector represented by this instance and the specified vector.
      Point3D crossProduct​(Point2D vector)
      Computes cross product of the vector represented by this instance and the specified vector.
      double distance​(double x1, double y1)
      Computes the distance between this point and point (x1, y1).
      double distance​(Point2D point)
      Computes the distance between this point and the specified point.
      double dotProduct​(double x, double y)
      Computes dot (scalar) product of the vector represented by this instance and the specified vector.
      double dotProduct​(Point2D vector)
      Computes dot (scalar) product of the vector represented by this instance and the specified vector.
      boolean equals​(Object obj)
      Indicates whether some other object is "equal to" this one.
      double getX​()
      The x coordinate.
      double getY​()
      The y coordinate.
      int hashCode​()
      Returns a hash code value for the point.
      double magnitude​()
      Computes magnitude (length) of the relative magnitude vector represented by this instance.
      Point2D midpoint​(double x, double y)
      Returns a point which lies in the middle between this point and the specified coordinates.
      Point2D midpoint​(Point2D point)
      Returns a point which lies in the middle between this point and the specified point.
      Point2D multiply​(double factor)
      Returns a point with the coordinates of this point multiplied by the specified factor
      Point2D normalize​()
      Normalizes the relative magnitude vector represented by this instance.
      Point2D subtract​(double x, double y)
      Returns a point with the specified coordinates subtracted from the coordinates of this point.
      Point2D subtract​(Point2D point)
      Returns a point with the coordinates of the specified point subtracted from the coordinates of this point.
      String toString​()
      Returns a string representation of this Point2D.
    • Field Detail

      • ZERO

        public static final Point2D ZERO
        Point or vector with both coordinates set to 0.
    • Constructor Detail

      • Point2D

        public Point2D​(double x,
                       double y)
        Creates a new instance of Point2D.
        Parameters:
        x - the x coordinate of the point
        y - the y coordinate of the point
    • Method Detail

      • getX

        public final double getX​()
        The x coordinate.
        Returns:
        the x coordinate
      • getY

        public final double getY​()
        The y coordinate.
        Returns:
        the y coordinate
      • distance

        public double distance​(double x1,
                               double y1)
        Computes the distance between this point and point (x1, y1).
        Parameters:
        x1 - the x coordinate of other point
        y1 - the y coordinate of other point
        Returns:
        the distance between this point and point (x1, y1).
      • distance

        public double distance​(Point2D point)
        Computes the distance between this point and the specified point.
        Parameters:
        point - the other point
        Returns:
        the distance between this point and the specified point.
        Throws:
        NullPointerException - if the specified point is null
      • add

        public Point2D add​(double x,
                           double y)
        Returns a point with the specified coordinates added to the coordinates of this point.
        Parameters:
        x - the X coordinate addition
        y - the Y coordinate addition
        Returns:
        the point with added coordinates
        Since:
        JavaFX 8.0
      • add

        public Point2D add​(Point2D point)
        Returns a point with the coordinates of the specified point added to the coordinates of this point.
        Parameters:
        point - the point whose coordinates are to be added
        Returns:
        the point with added coordinates
        Throws:
        NullPointerException - if the specified point is null
        Since:
        JavaFX 8.0
      • subtract

        public Point2D subtract​(double x,
                                double y)
        Returns a point with the specified coordinates subtracted from the coordinates of this point.
        Parameters:
        x - the X coordinate subtraction
        y - the Y coordinate subtraction
        Returns:
        the point with subtracted coordinates
        Since:
        JavaFX 8.0
      • multiply

        public Point2D multiply​(double factor)
        Returns a point with the coordinates of this point multiplied by the specified factor
        Parameters:
        factor - the factor multiplying the coordinates
        Returns:
        the point with multiplied coordinates
        Since:
        JavaFX 8.0
      • subtract

        public Point2D subtract​(Point2D point)
        Returns a point with the coordinates of the specified point subtracted from the coordinates of this point.
        Parameters:
        point - the point whose coordinates are to be subtracted
        Returns:
        the point with subtracted coordinates
        Throws:
        NullPointerException - if the specified point is null
        Since:
        JavaFX 8.0
      • normalize

        public Point2D normalize​()
        Normalizes the relative magnitude vector represented by this instance. Returns a vector with the same direction and magnitude equal to 1. If this is a zero vector, a zero vector is returned.
        Returns:
        the normalized vector represented by a Point2D instance
        Since:
        JavaFX 8.0
      • midpoint

        public Point2D midpoint​(double x,
                                double y)
        Returns a point which lies in the middle between this point and the specified coordinates.
        Parameters:
        x - the X coordinate of the second endpoint
        y - the Y coordinate of the second endpoint
        Returns:
        the point in the middle
        Since:
        JavaFX 8.0
      • midpoint

        public Point2D midpoint​(Point2D point)
        Returns a point which lies in the middle between this point and the specified point.
        Parameters:
        point - the other endpoint
        Returns:
        the point in the middle
        Throws:
        NullPointerException - if the specified point is null
        Since:
        JavaFX 8.0
      • angle

        public double angle​(double x,
                            double y)
        Computes the angle (in degrees) between the vector represented by this point and the specified vector.
        Parameters:
        x - the X magnitude of the other vector
        y - the Y magnitude of the other vector
        Returns:
        the angle between the two vectors measured in degrees
        Since:
        JavaFX 8.0
      • angle

        public double angle​(Point2D point)
        Computes the angle (in degrees) between the vector represented by this point and the vector represented by the specified point.
        Parameters:
        point - the other vector
        Returns:
        the angle between the two vectors measured in degrees, NaN if any of the two vectors is a zero vector
        Throws:
        NullPointerException - if the specified point is null
        Since:
        JavaFX 8.0
      • angle

        public double angle​(Point2D p1,
                            Point2D p2)
        Computes the angle (in degrees) between the three points with this point as a vertex.
        Parameters:
        p1 - one point
        p2 - other point
        Returns:
        angle between the vectors (this, p1) and (this, p2) measured in degrees, NaN if the three points are not different from one another
        Throws:
        NullPointerException - if p1 or p2 is null
        Since:
        JavaFX 8.0
      • magnitude

        public double magnitude​()
        Computes magnitude (length) of the relative magnitude vector represented by this instance.
        Returns:
        magnitude of the vector
        Since:
        JavaFX 8.0
      • dotProduct

        public double dotProduct​(double x,
                                 double y)
        Computes dot (scalar) product of the vector represented by this instance and the specified vector.
        Parameters:
        x - the X magnitude of the other vector
        y - the Y magnitude of the other vector
        Returns:
        the dot product of the two vectors
        Since:
        JavaFX 8.0
      • dotProduct

        public double dotProduct​(Point2D vector)
        Computes dot (scalar) product of the vector represented by this instance and the specified vector.
        Parameters:
        vector - the other vector
        Returns:
        the dot product of the two vectors
        Throws:
        NullPointerException - if the specified vector is null
        Since:
        JavaFX 8.0
      • crossProduct

        public Point3D crossProduct​(double x,
                                    double y)
        Computes cross product of the vector represented by this instance and the specified vector.
        Parameters:
        x - the X magnitude of the other vector
        y - the Y magnitude of the other vector
        Returns:
        the cross product of the two vectors
        Since:
        JavaFX 8.0
      • crossProduct

        public Point3D crossProduct​(Point2D vector)
        Computes cross product of the vector represented by this instance and the specified vector.
        Parameters:
        vector - the other vector
        Returns:
        the cross product of the two vectors
        Throws:
        NullPointerException - if the specified vector is null
        Since:
        JavaFX 8.0
      • equals

        public boolean equals​(Object obj)
        Indicates whether some other object is "equal to" this one.
        Overrides:
        equals in class Object
        Parameters:
        obj - the reference object with which to compare
        Returns:
        true if this point is the same as the obj argument; false otherwise
        See Also:
        Object.hashCode(), HashMap
      • toString

        public String toString​()
        Returns a string representation of this Point2D. This method is intended to be used only for informational purposes. The content and format of the returned string might vary between implementations. The returned string might be empty but cannot be null.
        Overrides:
        toString in class Object
        Returns:
        a string representation of the object.