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public
class
ArcShape
extends RectShape
java.lang.Object | |||
↳ | android.graphics.drawable.shapes.Shape | ||
↳ | android.graphics.drawable.shapes.RectShape | ||
↳ | android.graphics.drawable.shapes.ArcShape |
Creates an arc shape. The arc shape starts at a specified angle and sweeps clockwise, drawing slices of pie.
The arc can be drawn to a Canvas
with its own
draw(android.graphics.Canvas, android.graphics.Paint)
method, but more graphical control is available
if you instead pass the ArcShape to a
ShapeDrawable
.
Public constructors | |
---|---|
ArcShape(float startAngle, float sweepAngle)
ArcShape constructor. |
Public methods | |
---|---|
ArcShape
|
clone()
Creates and returns a copy of this object. |
void
|
draw(Canvas canvas, Paint paint)
Draws this shape into the provided Canvas, with the provided Paint. |
boolean
|
equals(Object o)
Indicates whether some other object is "equal to" this one. |
void
|
getOutline(Outline outline)
Computes the Outline of the shape and return it in the supplied Outline parameter. |
final
float
|
getStartAngle()
|
final
float
|
getSweepAngle()
|
int
|
hashCode()
Returns a hash code value for the object. |
Inherited methods | |
---|---|
public ArcShape (float startAngle, float sweepAngle)
ArcShape constructor.
Parameters | |
---|---|
startAngle |
float : the angle (in degrees) where the arc begins |
sweepAngle |
float : the sweep angle (in degrees). Anything equal to or
greater than 360 results in a complete circle/oval. |
public ArcShape clone ()
Creates and returns a copy of this object. The precise meaning
of "copy" may depend on the class of the object. The general
intent is that, for any object x
, the expression:
will be true, and that the expression:x.clone() != x
will bex.clone().getClass() == x.getClass()
true
, but these are not absolute requirements.
While it is typically the case that:
will bex.clone().equals(x)
true
, this is not an absolute requirement.
By convention, the returned object should be obtained by calling
super.clone
. If a class and all of its superclasses (except
Object
) obey this convention, it will be the case that
x.clone().getClass() == x.getClass()
.
By convention, the object returned by this method should be independent
of this object (which is being cloned). To achieve this independence,
it may be necessary to modify one or more fields of the object returned
by super.clone
before returning it. Typically, this means
copying any mutable objects that comprise the internal "deep structure"
of the object being cloned and replacing the references to these
objects with references to the copies. If a class contains only
primitive fields or references to immutable objects, then it is usually
the case that no fields in the object returned by super.clone
need to be modified.
The method clone
for class Object
performs a
specific cloning operation. First, if the class of this object does
not implement the interface Cloneable
, then a
CloneNotSupportedException
is thrown. Note that all arrays
are considered to implement the interface Cloneable
and that
the return type of the clone
method of an array type T[]
is T[]
where T is any reference or primitive type.
Otherwise, this method creates a new instance of the class of this
object and initializes all its fields with exactly the contents of
the corresponding fields of this object, as if by assignment; the
contents of the fields are not themselves cloned. Thus, this method
performs a "shallow copy" of this object, not a "deep copy" operation.
The class Object
does not itself implement the interface
Cloneable
, so calling the clone
method on an object
whose class is Object
will result in throwing an
exception at run time.
Returns | |
---|---|
ArcShape |
a clone of this instance. |
Throws | |
---|---|
CloneNotSupportedException |
public void draw (Canvas canvas, Paint paint)
Draws this shape into the provided Canvas, with the provided Paint.
Before calling this, you must call resize(float, float)
.
Parameters | |
---|---|
canvas |
Canvas : the Canvas within which this shape should be drawn |
paint |
Paint : the Paint object that defines this shape's characteristics |
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:
x
, x.equals(x)
should return
true
.
x
and y
, x.equals(y)
should return true
if and only if
y.equals(x)
returns true
.
x
, y
, and z
, if
x.equals(y)
returns true
and
y.equals(z)
returns true
, then
x.equals(z)
should return true
.
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.
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.
Parameters | |
---|---|
o |
Object : the reference object with which to compare. |
Returns | |
---|---|
boolean |
true if this object is the same as the obj
argument; false otherwise. |
public void getOutline (Outline outline)
Computes the Outline of the shape and return it in the supplied Outline
parameter. The default implementation does nothing and outline
is not changed.
Parameters | |
---|---|
outline |
Outline : the Outline to be populated with the result. Must be
non-null .
This value cannot be null . |
public final float getStartAngle ()
Returns | |
---|---|
float |
the angle (in degrees) where the arc begins |
public final float getSweepAngle ()
Returns | |
---|---|
float |
the sweep angle (in degrees) |
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:
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.
equals(Object)
method, then calling the hashCode
method on each of
the two objects must produce the same integer result.
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.)
Returns | |
---|---|
int |
a hash code value for this object. |