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Shape

public abstract class Shape
extends Object implements Cloneable

java.lang.Object
   ↳ android.graphics.drawable.shapes.Shape
Known Direct Subclasses
Known Indirect Subclasses


Defines a generic graphical "shape." Any Shape can be drawn to a Canvas with its own draw() method, but more graphical control is available if you instead pass it to a ShapeDrawable.

Summary

Public constructors

Shape()

Public methods

Shape clone()

Creates and returns a copy of this object.

abstract void draw(Canvas canvas, Paint paint)

Draw this shape into the provided Canvas, with the provided Paint.

final float getHeight()

Returns the height of the Shape.

void getOutline(Outline outline)

Compute the Outline of the shape and return it in the supplied Outline parameter.

final float getWidth()

Returns the width of the Shape.

boolean hasAlpha()

Checks whether the Shape is opaque.

final void resize(float width, float height)

Resizes the dimensions of this shape.

Protected methods

void onResize(float width, float height)

Callback method called when resize(float, float) is executed.

Inherited methods

From class java.lang.Object

Public constructors

Shape

Added in API level 1
Shape ()

Public methods

clone

Added in API level 1
Shape 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:

 x.clone() != x
will be true, and that the expression:
 x.clone().getClass() == x.getClass()
will be true, but these are not absolute requirements. While it is typically the case that:
 x.clone().equals(x)
will be 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
Shape a clone of this instance.
Throws
CloneNotSupportedException

draw

Added in API level 1
void draw (Canvas canvas, 
                Paint paint)

Draw 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

getHeight

Added in API level 1
float getHeight ()

Returns the height of the Shape.

Returns
float

getOutline

Added in API level 21
void getOutline (Outline outline)

Compute 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. Should not be null.

getWidth

Added in API level 1
float getWidth ()

Returns the width of the Shape.

Returns
float

hasAlpha

Added in API level 1
boolean hasAlpha ()

Checks whether the Shape is opaque. Default impl returns true. Override if your subclass can be opaque.

Returns
boolean true if any part of the drawable is not opaque.

resize

Added in API level 1
void resize (float width, 
                float height)

Resizes the dimensions of this shape. Must be called before draw(Canvas, Paint).

Parameters
width float: the width of the shape (in pixels)
height float: the height of the shape (in pixels)

Protected methods

onResize

Added in API level 1
void onResize (float width, 
                float height)

Callback method called when resize(float, float) is executed.

Parameters
width float: the new width of the Shape
height float: the new height of the Shape
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