gov.nasa.worldwind.render

Class ImageSource

java.lang.Object

gov.nasa.worldwind.render.ImageSource

public class ImageSource
extends java.lang.Object

Provides a mechanism for specifying images from a variety of sources. ImageSource retains the image source and its associated type on behalf of the caller, making this information available to WorldWind components that load images on the caller's behalf.

ImageSource supports four source types:

• Android android.graphics.Bitmap
• WorldWind ImageSource.BitmapFactory
• Android resource identifier
• File path
• Uniform Resource Locator (URL)

ImageSource instances are intended to be used as a key into a cache or other data structure that enables sharing of loaded images. Android bitmaps and WorldWind bitmap factories are compared by reference: two image sources are equivalent if they reference the same bitmap or the same bitmap factory. Android resource identifiers with equivalent IDs are considered equivalent, as are file paths and URLs with the same string representation.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	ImageSource.BitmapFactory Factory for delegating construction of bitmap images.

Method Summary

Modifier and Type	Method and Description
Bitmap	asBitmap() Returns the source bitmap.
ImageSource.BitmapFactory	asBitmapFactory() Returns the source bitmap factory.
java.lang.String	asFilePath() Returns the source file path name.
java.lang.Object	asObject() Returns the image source associated with an unrecognized type.
int	asResource() Returns the source Android resource identifier.
java.lang.String	asUrl() Returns the source URL string.
boolean	equals(java.lang.Object o)
static ImageSource	fromBitmap(Bitmap bitmap) Constructs an image source with a bitmap.
static ImageSource	fromBitmapFactory(ImageSource.BitmapFactory factory) Constructs an image source with a bitmap factory.
static ImageSource	fromFilePath(java.lang.String pathName) Constructs an image source with a file path.
static ImageSource	fromLineStipple(int factor, short pattern) Constructs a bitmap image source with a line stipple pattern.
static ImageSource	fromObject(java.lang.Object source) Constructs an image source with a generic Object instance.
static ImageSource	fromResource(int id) Constructs an image source with an Android resource identifier.
static ImageSource	fromUrl(java.lang.String urlString) Constructs an image source with a URL string.
int	hashCode()
boolean	isBitmap() Indicates whether this image source is a Bitmap.
boolean	isBitmapFactory() Indicates whether this image source is a bitmap factory.
boolean	isFilePath() Indicates whether this image source is a file path.
boolean	isResource() Indicates whether this image source is an Android resource.
boolean	isUrl() Indicates whether this image source is a URL string.
java.lang.String	toString()

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Method Detail

fromBitmap

public static ImageSource fromBitmap(Bitmap bitmap)

Constructs an image source with a bitmap. The bitmap's dimensions should be no greater than 2048 x 2048.

Parameters:

bitmap - the bitmap to use as an image source

Returns:

the new image source

Throws:

java.lang.IllegalArgumentException - If the bitmap is null or recycled

fromBitmapFactory

public static ImageSource fromBitmapFactory(ImageSource.BitmapFactory factory)

Constructs an image source with a bitmap factory. WorldWind shapes configured with a bitmap factory image source construct their bitmaps lazily, typically when the shape becomes visible on screen. The factory must create images with dimensions to no greater than 2048 x 2048.

Parameters:

factory - the bitmap factory to use as an image source

Returns:

the new image source

Throws:

java.lang.IllegalArgumentException - If the factory is null

fromResource

public static ImageSource fromResource(int id)

Constructs an image source with an Android resource identifier. The resource must be accessible from the Android Context associated with the WorldWindow, and its dimensions should be no greater than 2048 x 2048.

Parameters:

id - the resource identifier, as generated by the aapt tool

Returns:

the new image source

fromFilePath

public static ImageSource fromFilePath(java.lang.String pathName)

Constructs an image source with a file path.

Parameters:

pathName - complete path name to the file

Returns:

the new image source

Throws:

java.lang.IllegalArgumentException - If the path name is null

fromUrl

public static ImageSource fromUrl(java.lang.String urlString)

Constructs an image source with a URL string. The image's dimensions should be no greater than 2048 x 2048. The application's manifest must include the permissions that allow network connections.

Parameters:

urlString - complete URL string

Returns:

the new image source

Throws:

java.lang.IllegalArgumentException - If the URL string is null

fromLineStipple

public static ImageSource fromLineStipple(int factor,
                                          short pattern)

Constructs a bitmap image source with a line stipple pattern. The result is a one-dimensional bitmap with pixels representing the specified stipple factor and stipple pattern. Line stipple images can be used for displaying dashed shape outlines. See ShapeAttributes.setOutlineImageSource(ImageSource).

Parameters:

factor - specifies the number of times each bit in the pattern is repeated before the next bit is used. For example, if the factor is 3, each bit is repeated three times before using the next bit. The specified factor must be either 0 or an integer greater than 0. A factor of 0 indicates no stippling.

pattern - specifies a number whose lower 16 bits define a pattern of which pixels in the image are white and which are transparent. Each bit corresponds to a pixel, and the pattern repeats after every n*16 pixels, where n is the factor. For example, if the factor is 3, each bit in the pattern is repeated three times before using the next bit.

Returns:

the new image source

fromObject

public static ImageSource fromObject(java.lang.Object source)

Constructs an image source with a generic Object instance. The source may be any non-null Object. This is equivalent to calling one of ImageSource's type-specific factory methods when the source is a recognized type: bitmap; bitmap factory; integer resource ID; file path; URL string.

Parameters:

source - the generic source

Returns:

the new image source

Throws:

java.lang.IllegalArgumentException - If the source is null

equals

public boolean equals(java.lang.Object o)

Overrides:

equals in class java.lang.Object

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

isBitmap

public boolean isBitmap()

Indicates whether this image source is a Bitmap.

Returns:

true if the source is a Bitmap, otherwise false

isBitmapFactory

public boolean isBitmapFactory()

Indicates whether this image source is a bitmap factory.

Returns:

true if the source is a bitmap factory, otherwise false

isResource

public boolean isResource()

Indicates whether this image source is an Android resource.

Returns:

true if the source is an Android resource, otherwise false

isFilePath

public boolean isFilePath()

Indicates whether this image source is a file path.

Returns:

true if the source is an file path, otherwise false

isUrl

public boolean isUrl()

Indicates whether this image source is a URL string.

Returns:

true if the source is a URL string, otherwise false

asBitmap

public Bitmap asBitmap()

Returns the source bitmap. Call isBitmap to determine whether or not the source is a bitmap.

Returns:

the bitmap, or null if the source is not a bitmap

asBitmapFactory

public ImageSource.BitmapFactory asBitmapFactory()

Returns the source bitmap factory. Call isBitmapFactory to determine whether or not the source is a bitmap factory.

Returns:

the bitmap factory, or null if the source is not a bitmap factory

asResource

public int asResource()

Returns the source Android resource identifier. Call isResource to determine whether or not the source is an Android resource.

Returns:

the resource identifier as generated by the aapt tool, or null if the source is not an Android resource

asFilePath

public java.lang.String asFilePath()

Returns the source file path name. Call isFilePath to determine whether or not the source is a file path.

Returns:

the file path name, or null if the source is not a file path

asUrl

public java.lang.String asUrl()

Returns the source URL string. Call isUrl to determine whether or not the source is a URL string.

Returns:

the URL string, or null if the source is not a URL string

asObject

public java.lang.Object asObject()

Returns the image source associated with an unrecognized type.

Returns:

the source object