Point2D (allbs-model 0.2.8 API)

java.lang.Object
- cn.allbs.model.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.

作者:

ChenQi

字段概要

字段
限定符和类型字段和说明

static Point2D ZERO
Point or vector with both coordinates set to 0.

字段
限定符和类型	字段和说明
`static Point2D`	`ZERO` Point or vector with both coordinates set to 0.

构造器概要

构造器
构造器和说明

Point2D(double x, double y)
Creates a new instance of Point2D.

构造器
构造器和说明
`Point2D(double x, double y)` Creates a new instance of `Point2D`.

方法概要

所有方法实例方法具体方法
限定符和类型	方法和说明
`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`.

从类继承的方法 java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait

- 字段详细资料
  - ZERO
```
public static final Point2D ZERO
```
    Point or vector with both coordinates set to 0.
- 构造器详细资料
  - Point2D
```
public Point2D(double x,
               double y)
```
    Creates a new instance of Point2D.
    
    参数:
    
    x - the x coordinate of the point
    
    y - the y coordinate of the point
- 方法详细资料
  - getX
```
public final double getX()
```
    The x coordinate.
    
    返回:
    
    the x coordinate
  - getY
```
public final double getY()
```
    The y coordinate.
    
    返回:
    
    the y coordinate
  - distance
```
public double distance(double x1,
                       double y1)
```
    Computes the distance between this point and point (x1, y1).
    
    参数:
    
    x1 - the x coordinate of other point
    
    y1 - the y coordinate of other point
    
    返回:
    
    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.
    
    参数:
    
    point - the other point
    
    返回:
    
    the distance between this point and the specified point.
    
    抛出:
    
    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.
    
    参数:
    
    x - the X coordinate addition
    
    y - the Y coordinate addition
    
    返回:
    
    the point with added coordinates
    
    从以下版本开始:
    
    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.
    
    参数:
    
    point - the point whose coordinates are to be added
    
    返回:
    
    the point with added coordinates
    
    抛出:
    
    NullPointerException - if the specified point is null
    
    从以下版本开始:
    
    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.
    
    参数:
    
    x - the X coordinate subtraction
    
    y - the Y coordinate subtraction
    
    返回:
    
    the point with subtracted coordinates
    
    从以下版本开始:
    
    JavaFX 8.0
  - multiply
```
public Point2D multiply(double factor)
```
    Returns a point with the coordinates of this point multiplied by the specified factor
    
    参数:
    
    factor - the factor multiplying the coordinates
    
    返回:
    
    the point with multiplied coordinates
    
    从以下版本开始:
    
    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.
    
    参数:
    
    point - the point whose coordinates are to be subtracted
    
    返回:
    
    the point with subtracted coordinates
    
    抛出:
    
    NullPointerException - if the specified point is null
    
    从以下版本开始:
    
    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.
    
    返回:
    
    the normalized vector represented by a Point2D instance
    
    从以下版本开始:
    
    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.
    
    参数:
    
    x - the X coordinate of the second endpoint
    
    y - the Y coordinate of the second endpoint
    
    返回:
    
    the point in the middle
    
    从以下版本开始:
    
    JavaFX 8.0
  - midpoint
```
public Point2D midpoint(Point2D point)
```
    Returns a point which lies in the middle between this point and the specified point.
    
    参数:
    
    point - the other endpoint
    
    返回:
    
    the point in the middle
    
    抛出:
    
    NullPointerException - if the specified point is null
    
    从以下版本开始:
    
    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.
    
    参数:
    
    x - the X magnitude of the other vector
    
    y - the Y magnitude of the other vector
    
    返回:
    
    the angle between the two vectors measured in degrees
    
    从以下版本开始:
    
    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.
    
    参数:
    
    point - the other vector
    
    返回:
    
    the angle between the two vectors measured in degrees, NaN if any of the two vectors is a zero vector
    
    抛出:
    
    NullPointerException - if the specified point is null
    
    从以下版本开始:
    
    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.
    
    参数:
    
    p1 - one point
    
    p2 - other point
    
    返回:
    
    angle between the vectors (this, p1) and (this, p2) measured in degrees, NaN if the three points are not different from one another
    
    抛出:
    
    NullPointerException - if p1 or p2 is null
    
    从以下版本开始:
    
    JavaFX 8.0
  - magnitude
```
public double magnitude()
```
    Computes magnitude (length) of the relative magnitude vector represented by this instance.
    
    返回:
    
    magnitude of the vector
    
    从以下版本开始:
    
    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.
    
    参数:
    
    x - the X magnitude of the other vector
    
    y - the Y magnitude of the other vector
    
    返回:
    
    the dot product of the two vectors
    
    从以下版本开始:
    
    JavaFX 8.0
  - dotProduct
```
public double dotProduct(Point2D vector)
```
    Computes dot (scalar) product of the vector represented by this instance and the specified vector.
    
    参数:
    
    vector - the other vector
    
    返回:
    
    the dot product of the two vectors
    
    抛出:
    
    NullPointerException - if the specified vector is null
    
    从以下版本开始:
    
    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.
    
    参数:
    
    x - the X magnitude of the other vector
    
    y - the Y magnitude of the other vector
    
    返回:
    
    the cross product of the two vectors
    
    从以下版本开始:
    
    JavaFX 8.0
  - crossProduct
```
public Point3D crossProduct(Point2D vector)
```
    Computes cross product of the vector represented by this instance and the specified vector.
    
    参数:
    
    vector - the other vector
    
    返回:
    
    the cross product of the two vectors
    
    抛出:
    
    NullPointerException - if the specified vector is null
    
    从以下版本开始:
    
    JavaFX 8.0
  - equals
```
public boolean equals(Object obj)
```
    Indicates whether some other object is "equal to" this one.
    
    覆盖:
    
    equals 在类中 Object
    
    参数:
    
    obj - the reference object with which to compare
    
    返回:
    
    true if this point is the same as the obj argument; false otherwise
  - hashCode
```
public int hashCode()
```
    Returns a hash code value for the point.
    
    覆盖:
    
    hashCode 在类中 Object
    
    返回:
    
    a hash code value for the point.
  - 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.
    
    覆盖:
    
    toString 在类中 Object

类 Point2D

字段概要

构造器概要

方法概要

从类继承的方法 java.lang.Object

字段详细资料

ZERO

构造器详细资料

Point2D

方法详细资料

getX

getY

distance

distance

add

add

subtract

multiply

subtract

normalize

midpoint

midpoint

angle

angle

angle

magnitude

dotProduct

dotProduct

crossProduct

crossProduct

equals

hashCode

toString