Line

java.lang.Object
- ohos.agp.utils.Line

```
public class Line
extends Object
```
Provides line specifications and alpha values.

从以下版本开始:

5

构造器概要

构造器
构造器说明

Line(Point startPoint, Point endPoint)
A constructor used to create a Line instance with specified start and end points.

构造器
构造器	说明
`Line(Point startPoint, Point endPoint)`	A constructor used to create a `Line` instance with specified start and end points.

方法概要

所有方法实例方法具体方法
限定符和类型	方法	说明
`boolean`	`equals(Object object)`	Indicates whether some other object is "equal to" this one.
`double`	`getDistance()`	Obtains the distance between the start point and end point of this line.
`Point`	`getEndPoint()`	Obtains the line's end point.
`float`	`getEndPointX()`	Obtains the x-coordinate of the line's end point.
`float`	`getEndPointY()`	Obtains the y-coordinate of the line's end point.
`Point`	`getStartPoint()`	Obtains the line's start point.
`float`	`getStartPointX()`	Obtains the x-coordinate of the line's start point.
`float`	`getStartPointY()`	Obtains the y-coordinate of the line's start point.
`int`	`hashCode()`	Returns a hash code value for the object.
`boolean`	`isEmpty()`	Checks whether the distance between the start point and end point of this line is zero.
`boolean`	`isVertical(Line line)`	Checks whether a specified line and this line are vertical.
`void`	`set(float startPointX, float startPointY, float endPointX, float endPointY)`	Sets the coordinates for this line's start and end points.
`void`	`set(Line line)`	Sets attributes of this line.
`void`	`set(Point startPoint, Point endPoint)`	Sets the start and end points for this line.
`void`	`setEmpty()`	Sets the coordinates of this line's start and end points to (0, 0).
`void`	`setEndPoint(Point point)`	Sets the end point for this line.
`void`	`setEndPointX(float x)`	Sets the x-coordinate for this line's end point.
`void`	`setEndPointY(float y)`	Sets the y-coordinate for this line's end point.
`void`	`setStartPoint(Point point)`	Sets the start point for this line.
`void`	`setStartPointX(float x)`	Sets the x-coordinate for this line's start point.
`void`	`setStartPointY(float y)`	Sets the y-coordinate for this line's start point.
`String`	`toString()`	Returns a string representation of the object.
`void`	`translate(float dx, float dy)`	Translates this line by a specified distance.
`void`	`translate(Point point)`	Translates this line, whose offsets on the x- and y- axes are specified by a `Point` instance.

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

- 构造器详细资料
  - Line
```
public Line(Point startPoint,
            Point endPoint)
```
    A constructor used to create a Line instance with specified start and end points.
    
    参数:
    
    startPoint - Indicates the specified start point of the Line instance.
    
    endPoint - Indicates the specified end point of the Line instance.
    
    从以下版本开始:
    
    5
- 方法详细资料
  - isEmpty
```
public boolean isEmpty()
```
    Checks whether the distance between the start point and end point of this line is zero.
    
    返回:
    
    Returns true if the length of this line is zero; returns false otherwise.
    
    从以下版本开始:
    
    5
  - set
```
public void set(Line line)
```
    Sets attributes of this line.
    
    参数:
    
    line - Indicates the line attributes to set.
    
    从以下版本开始:
    
    5
  - set
```
public void set(float startPointX,
                float startPointY,
                float endPointX,
                float endPointY)
```
    Sets the coordinates for this line's start and end points.
    
    参数:
    
    startPointX - Indicates the x-coordinate of the line's start point to set.
    
    startPointY - Indicates the y-coordinate of the line's start point to set.
    
    endPointX - Indicates the x-coordinate of the line's end point to set.
    
    endPointY - Indicates the y-coordinate of the line's end point to set.
    
    从以下版本开始:
    
    5
  - set
```
public void set(Point startPoint,
                Point endPoint)
```
    Sets the start and end points for this line.
    
    参数:
    
    startPoint - Indicates the start point to set.
    
    endPoint - Indicates the end point to set.
    
    从以下版本开始:
    
    5
  - setStartPointX
```
public void setStartPointX(float x)
```
    Sets the x-coordinate for this line's start point.
    
    参数:
    
    x - Indicates the x-coordinate to set.
    
    从以下版本开始:
    
    5
  - setStartPointY
```
public void setStartPointY(float y)
```
    Sets the y-coordinate for this line's start point.
    
    参数:
    
    y - Indicates the y-coordinate to set.
    
    从以下版本开始:
    
    5
  - setEndPointX
```
public void setEndPointX(float x)
```
    Sets the x-coordinate for this line's end point.
    
    参数:
    
    x - Indicates the x-coordinate to set.
    
    从以下版本开始:
    
    5
  - setEndPointY
```
public void setEndPointY(float y)
```
    Sets the y-coordinate for this line's end point.
    
    参数:
    
    y - Indicates the y-coordinate to set.
    
    从以下版本开始:
    
    5
  - setEmpty
```
public void setEmpty()
```
    Sets the coordinates of this line's start and end points to (0, 0).
    
    从以下版本开始:
    
    5
  - getDistance
```
public double getDistance()
```
    Obtains the distance between the start point and end point of this line.
    
    返回:
    
    Returns the distance.
    
    从以下版本开始:
    
    5
  - getStartPoint
```
public Point getStartPoint()
```
    Obtains the line's start point.
    
    返回:
    
    Returns the line's start point.
    
    从以下版本开始:
    
    5
  - getEndPoint
```
public Point getEndPoint()
```
    Obtains the line's end point.
    
    返回:
    
    Returns the line's end point.
    
    从以下版本开始:
    
    5
  - getStartPointX
```
public float getStartPointX()
```
    Obtains the x-coordinate of the line's start point.
    
    返回:
    
    Returns the x-coordinate of the line's start point.
    
    从以下版本开始:
    
    5
  - getStartPointY
```
public float getStartPointY()
```
    Obtains the y-coordinate of the line's start point.
    
    返回:
    
    Returns the y-coordinate of the line's start point.
    
    从以下版本开始:
    
    5
  - getEndPointX
```
public float getEndPointX()
```
    Obtains the x-coordinate of the line's end point.
    
    返回:
    
    Returns the x-coordinate of the line's end point.
    
    从以下版本开始:
    
    5
  - getEndPointY
```
public float getEndPointY()
```
    Obtains the y-coordinate of the line's end point.
    
    返回:
    
    Returns the y-coordinate of the line's end point.
    
    从以下版本开始:
    
    5
  - setStartPoint
```
public void setStartPoint(Point point)
```
    Sets the start point for this line.
    
    参数:
    
    point - Indicates the start point to set.
    
    从以下版本开始:
    
    5
  - setEndPoint
```
public void setEndPoint(Point point)
```
    Sets the end point for this line.
    
    参数:
    
    point - Indicates the end point to set.
    
    从以下版本开始:
    
    5
  - translate
```
public void translate(float dx,
                      float dy)
```
    Translates this line by a specified distance.
    
    参数:
    
    dx - Indicates the offset of this line on the x-axis.
    
    dy - Indicates the offset of this line on the y-axis.
    
    从以下版本开始:
    
    5
  - translate
```
public void translate(Point point)
```
    Translates this line, whose offsets on the x- and y- axes are specified by a Point instance.
    
    参数:
    
    point - Indicates the Point instance that specifies the offsets of this line on the x- and y- axes.
    
    从以下版本开始:
    
    5
  - hashCode
```
public int hashCode()
```
    从类复制的说明: Object
    Returns a hash code value for the object. This method is supported for the benefit of hash tables such as those provided by HashMap.
    The general contract of hashCode is:
    - Whenever it is invoked on the same object more than once during an execution of a Java application, the hashCode method must consistently return the same integer, provided no information used in equals comparisons on the object is modified. This integer need not remain consistent from one execution of an application to another execution of the same application.
    - If two objects are equal according to the equals(Object) method, then calling the hashCode method on each of the two objects must produce the same integer result.
    - It is not required that if two objects are unequal according to the Object.equals(java.lang.Object) method, then calling the hashCode method on each of the two objects must produce distinct integer results. However, the programmer should be aware that producing distinct integer results for unequal objects may improve the performance of hash tables.
    As much as is reasonably practical, the hashCode method defined by class Object does return distinct integers for distinct objects. (This is typically implemented by converting the internal address of the object into an integer, but this implementation technique is not required by the Java™ programming language.)
    覆盖:
    
    hashCode 在类中 Object
    
    返回:
    
    a hash code value for this object.
    
    另请参阅:
    
    Object.equals(java.lang.Object), System.identityHashCode(java.lang.Object)
  - equals
```
public boolean equals(Object object)
```
    从类复制的说明: Object
    Indicates whether some other object is "equal to" this one.
    The equals method implements an equivalence relation on non-null object references:
    - It is reflexive: for any non-null reference value x, x.equals(x) should return true.
    - It is symmetric: for any non-null reference values x and y, x.equals(y) should return true if and only if y.equals(x) returns true.
    - It is transitive: for any non-null reference values x, y, and z, if x.equals(y) returns true and y.equals(z) returns true, then x.equals(z) should return true.
    - It is consistent: for any non-null reference values x and y, multiple invocations of x.equals(y) consistently return true or consistently return false, provided no information used in equals comparisons on the objects is modified.
    - For any non-null reference value x, x.equals(null) should return false.
    The equals method for class Object implements the most discriminating possible equivalence relation on objects; that is, for any non-null reference values x and y, this method returns true if and only if x and y refer to the same object (x == y has the value true).
    Note that it is generally necessary to override the hashCode method whenever this method is overridden, so as to maintain the general contract for the hashCode method, which states that equal objects must have equal hash codes.
    覆盖:
    
    equals 在类中 Object
    
    参数:
    
    object - the reference object with which to compare.
    
    返回:
    
    true if this object is the same as the obj argument; false otherwise.
    
    另请参阅:
    
    Object.hashCode(), HashMap
  - toString
```
public String toString()
```
    从类复制的说明: Object
    Returns a string representation of the object. In general, the toString method returns a string that "textually represents" this object. The result should be a concise but informative representation that is easy for a person to read. It is recommended that all subclasses override this method.
    The toString method for class Object returns a string consisting of the name of the class of which the object is an instance, the at-sign character `@', and the unsigned hexadecimal representation of the hash code of the object. In other words, this method returns a string equal to the value of:
    getClass().getName() + '@' + Integer.toHexString(hashCode())
    覆盖:
    
    toString 在类中 Object
    
    返回:
    
    a string representation of the object.
  - isVertical
```
public boolean isVertical(Line line)
```
    Checks whether a specified line and this line are vertical.
    
    参数:
    
    line - Indicates the specified line.
    
    返回:
    
    Returns true if two lines are vertical; returns false otherwise.
    
    从以下版本开始:
    
    5

类 Line

构造器概要

方法概要

从类继承的方法 java.lang.Object

构造器详细资料

Line

方法详细资料

isEmpty

set

set

set

setStartPointX

setStartPointY

setEndPointX

setEndPointY

setEmpty

getDistance

getStartPoint

getEndPoint

getStartPointX

getStartPointY

getEndPointX

getEndPointY

setStartPoint

setEndPoint

translate

translate

hashCode

equals

toString

isVertical