java.awt
Class Image
public abstract class Image
This is the abstract superclass of all image objects in Java.
static int | SCALE_AREA_AVERAGING - Constant indicating that the area averaging scaling algorithm should be
used.
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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 Object | UndefinedProperty - This variable is returned whenever a property that is not defined
is requested.
|
protected float | accelerationPriority - The acceleration priority of the image
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Image() - A default constructor for subclasses.
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clone , equals , extends Object> getClass , finalize , hashCode , notify , notifyAll , toString , wait , wait , wait |
getHeight
public abstract int getHeight(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.
observer
- the image observer for this object
getProperty
public abstract Object getProperty(String name,
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.
name
- the requested property nameobserver
- the image observer for this object
- the named property, if available
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.
width
- the width of the scaled imageheight
- the height of the scaled imageflags
- a value indicating the algorithm to use
getWidth
public abstract int getWidth(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.
observer
- the image observer for this object
setAccelerationPriority
public void setAccelerationPriority(float priority)
Sets the acceleration priority of the image.
This is a value from 0 (lowest) to 1 (highest), which may
be used as a hint for image acceleration.
E.g. higher priority images may be stored in video memory.
priority
- - the priority
Image.java -- superclass for images
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