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java.awt
Class Image  

java.lang.Object
  java.awt.Image

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public abstract class Image

extends java.lang.Object

This is the abstract superclass of all image objects in Java.

Since:

1.0

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Field Summary
static int	SCALE_AREA_AVERAGING           Constant indicating that the area averaging scaling algorithm should be used.
static int	SCALE_DEFAULT           Constant indicating that the default scaling algorithm should be used.
static int	SCALE_FAST           Constant indicating that a fast scaling algorithm should be used.
static int	SCALE_REPLICATE           Constant indicating that the ReplicateScaleFilter class algorithm should be used for scaling.
static int	SCALE_SMOOTH           Constant indicating that a smooth scaling algorithm should be used.
static java.lang.Object	UndefinedProperty           This variable is returned whenever a property that is not defined is requested.

 

Constructor Summary

Image()           A default constructor for subclasses.

 

Method Summary
abstract  void	flush()           Flushes (that is, destroys) any resources used for this image.
abstract  Graphics	getGraphics()           Returns a graphics context object for drawing an off-screen object.
abstract  int	getHeight(java.awt.image.ImageObserver observer)           Returns the height of the image, or -1 if it is unknown.
abstract  java.lang.Object	getProperty(java.lang.String name, java.awt.image.ImageObserver observer)           This method requests a named property for an object.
Image	getScaledInstance(int width, int height, int flags)           Scales the image to the requested dimension.
abstract  java.awt.image.ImageProducer	getSource()           Returns the image producer object for this object.
abstract  int	getWidth(java.awt.image.ImageObserver observer)           Returns the width of the image, or -1 if it is unknown.

 

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

 

Field Detail

UndefinedProperty

public static final java.lang.Object UndefinedProperty

This variable is returned whenever a property that is not defined is requested.

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SCALE_DEFAULT

public static final int SCALE_DEFAULT

Constant indicating that the default scaling algorithm should be used.

Since:

1.1

See Also:

Constant Field Values

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SCALE_FAST

public static final int SCALE_FAST

Constant indicating that a fast scaling algorithm should be used.

Since:

1.1

See Also:

Constant Field Values

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SCALE_SMOOTH

public static final int SCALE_SMOOTH

Constant indicating that a smooth scaling algorithm should be used.

Since:

1.1

See Also:

Constant Field Values

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SCALE_REPLICATE

public static final int SCALE_REPLICATE

Constant indicating that the ReplicateScaleFilter class algorithm should be used for scaling.

Since:

1.1

See Also:

java.awt.image.ReplicateScaleFilter, Constant Field Values

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SCALE_AREA_AVERAGING

public static final int SCALE_AREA_AVERAGING

Constant indicating that the area averaging scaling algorithm should be used.

Since:

1.1

See Also:

java.awt.image.AreaAveragingScaleFilter, Constant Field Values

Constructor Detail

Image

public Image()

A default constructor for subclasses.

Method Detail

getWidth

public abstract int getWidth(java.awt.image.ImageObserver observer)

Returns the width of the image, or -1 if it is unknown. If the image width is unknown, the observer object will be notified when the value is known.

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getHeight

public abstract int getHeight(java.awt.image.ImageObserver observer)

Returns the height of the image, or -1 if it is unknown. If the image height is unknown, the observer object will be notified when the value is known.

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getSource

public abstract java.awt.image.ImageProducer getSource()

Returns the image producer object for this object. The producer is the object which generates pixels for this image.

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getGraphics

public abstract Graphics getGraphics()

Returns a graphics context object for drawing an off-screen object. This method is only valid for off-screen objects.

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getProperty

public abstract java.lang.Object getProperty(java.lang.String name,
                                             java.awt.image.ImageObserver observer)

This method requests a named property for an object. The value of the property is returned. The value UndefinedProperty is returned if there is no property with the specified name. The value null is returned if the properties for the object are not yet known. In this case, the specified image observer is notified when the properties are known.

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getScaledInstance

public Image getScaledInstance(int width,
                               int height,
                               int flags)

Scales the image to the requested dimension. A new Image with asynchronous loading will be produced according to the hints of the algorithm requested. If either the width or height is non-positive, it is adjusted to preserve the original aspect ratio. If an illegal value of flags is passed, the default algorithm is used.

Since:

1.1

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flush

public abstract void flush()

Flushes (that is, destroys) any resources used for this image. This includes the actual image data.

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