PointF
public
class
PointF
extends Object
implements
Parcelable
java.lang.Object | |
↳ | android.graphics.PointF |
PointF holds two float coordinates
Summary
Inherited constants | ||||
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Public constructors | |
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PointF()
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PointF(float x, float y)
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PointF(Point p)
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PointF(PointF p)
Create a new PointF initialized with the values in the specified PointF (which is left unmodified). |
Public methods | |
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int
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describeContents()
Parcelable interface methods |
final
boolean
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equals(float x, float y)
Returns true if the point's coordinates equal (x,y) |
boolean
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equals(Object o)
Indicates whether some other object is "equal to" this one. |
int
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hashCode()
Returns a hash code value for the object. |
static
float
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length(float x, float y)
Returns the euclidian distance from (0,0) to (x,y) |
final
float
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length()
Return the euclidian distance from (0,0) to the point |
final
void
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negate()
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final
void
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offset(float dx, float dy)
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void
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readFromParcel(Parcel in)
Set the point's coordinates from the data stored in the specified parcel. |
final
void
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set(PointF p)
Set the point's x and y coordinates to the coordinates of p |
final
void
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set(float x, float y)
Set the point's x and y coordinates |
String
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toString()
Returns a string representation of the object. |
void
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writeToParcel(Parcel out, int flags)
Write this point to the specified parcel. |
Inherited methods | |||||||||||||||||||||||
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Fields
Public constructors
PointF
public PointF (PointF p)
Create a new PointF initialized with the values in the specified PointF (which is left unmodified).
Parameters | |
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p |
PointF : The point whose values are copied into the new
point.
This value cannot be null . |
Public methods
describeContents
public int describeContents ()
Parcelable interface methods
Returns | |
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int |
a bitmask indicating the set of special object types marshaled
by this Parcelable object instance.
Value is either 0 or CONTENTS_FILE_DESCRIPTOR |
equals
public final boolean equals (float x, float y)
Returns true if the point's coordinates equal (x,y)
Parameters | |
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x |
float |
y |
float |
Returns | |
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boolean |
equals
public boolean equals (Object o)
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 returntrue
. - It is symmetric: for any non-null reference values
x
andy
,x.equals(y)
should returntrue
if and only ify.equals(x)
returnstrue
. - It is transitive: for any non-null reference values
x
,y
, andz
, ifx.equals(y)
returnstrue
andy.equals(z)
returnstrue
, thenx.equals(z)
should returntrue
. - It is consistent: for any non-null reference values
x
andy
, multiple invocations ofx.equals(y)
consistently returntrue
or consistently returnfalse
, provided no information used inequals
comparisons on the objects is modified. - For any non-null reference value
x
,x.equals(null)
should returnfalse
.
An equivalence relation partitions the elements it operates on into equivalence classes; all the members of an equivalence class are equal to each other. Members of an equivalence class are substitutable for each other, at least for some purposes.
Parameters | |
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o |
Object : the reference object with which to compare. |
Returns | |
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boolean |
true if this object is the same as the obj
argument; false otherwise. |
hashCode
public int hashCode ()
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 inequals
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
method, then calling thehashCode
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
equals
method, then calling thehashCode
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.
Returns | |
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int |
a hash code value for this object. |
length
public static float length (float x, float y)
Returns the euclidian distance from (0,0) to (x,y)
Parameters | |
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x |
float |
y |
float |
Returns | |
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float |
length
public final float length ()
Return the euclidian distance from (0,0) to the point
Returns | |
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float |
offset
public final void offset (float dx, float dy)
Parameters | |
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dx |
float |
dy |
float |
readFromParcel
public void readFromParcel (Parcel in)
Set the point's coordinates from the data stored in the specified parcel. To write a point to a parcel, call writeToParcel().
Parameters | |
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in |
Parcel : The parcel to read the point's coordinates from
This value cannot be null . |
set
public final void set (PointF p)
Set the point's x and y coordinates to the coordinates of p
Parameters | |
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p |
PointF : This value cannot be null . |
set
public final void set (float x, float y)
Set the point's x and y coordinates
Parameters | |
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x |
float |
y |
float |
toString
public String toString ()
Returns a string representation of the object.
Returns | |
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String |
a string representation of the object. |
writeToParcel
public void writeToParcel (Parcel out, int flags)
Write this point to the specified parcel. To restore a point from a parcel, use readFromParcel()
Parameters | |
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out |
Parcel : The parcel to write the point's coordinates into |
flags |
int : Additional flags about how the object should be written.
May be 0 or Parcelable.PARCELABLE_WRITE_RETURN_VALUE .
Value is either 0 or a combination of Parcelable.PARCELABLE_WRITE_RETURN_VALUE , and android.os.Parcelable.PARCELABLE_ELIDE_DUPLICATES |