ArcShape
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
.
Summary
Public constructors | |
---|---|
ArcShape(float startAngle, float sweepAngle)
ArcShape constructor. |
Public methods | |
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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 constructors
ArcShape
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 methods
clone
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 be x.clone().getClass() == x.getClass()
true
, but these are not absolute requirements.
While it is typically the case that:
will be x.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.
Returns | |
---|---|
ArcShape |
a clone of this instance. |
Throws | |
---|---|
CloneNotSupportedException |
draw
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 |
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 | |
---|---|
o |
Object : the reference object with which to compare. |
Returns | |
---|---|
boolean |
true if this object is the same as the obj
argument; false otherwise. |
getOutline
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 . |
getStartAngle
public final float getStartAngle ()
Returns | |
---|---|
float |
the angle (in degrees) where the arc begins |
getSweepAngle
public final float getSweepAngle ()
Returns | |
---|---|
float |
the sweep angle (in degrees) |
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 | |
---|---|
int |
a hash code value for this object. |