Class AbstractMultiResolutionImage
- java.lang.Object
-
- java.awt.Image
-
- java.awt.image.AbstractMultiResolutionImage
- All Implemented Interfaces:
MultiResolutionImage
- Direct Known Subclasses:
BaseMultiResolutionImage
public abstract class AbstractMultiResolutionImage extends Image implements MultiResolutionImage
This class provides default implementations of several Image
methods for classes that want to implement the MultiResolutionImage
interface. For example,
public class CustomMultiResolutionImage extends AbstractMultiResolutionImage { final Image[] resolutionVariants; public CustomMultiResolutionImage(Image... resolutionVariants) { this.resolutionVariants = resolutionVariants; } public Image getResolutionVariant( double destImageWidth, double destImageHeight) { // return a resolution variant based on the given destination image size } public List<Image> getResolutionVariants() { return Collections.unmodifiableList(Arrays.asList(resolutionVariants)); } protected Image getBaseImage() { return resolutionVariants[0]; } }
- Since:
- 9
- See Also:
-
Image
,MultiResolutionImage
Field Summary
Fields declared in class java.awt.Image
accelerationPriority, SCALE_AREA_AVERAGING, SCALE_DEFAULT, SCALE_FAST, SCALE_REPLICATE, SCALE_SMOOTH, UndefinedProperty
Constructor Summary
Constructor | Description |
---|---|
AbstractMultiResolutionImage() |
Method Summary
Modifier and Type | Method | Description |
---|---|---|
protected abstract Image | getBaseImage() | Return the base image representing the best version of the image for rendering at the default width and height. |
Graphics | getGraphics() | As per the contract of the base |
int | getHeight(ImageObserver observer) | This method simply delegates to the same method on the base image and it is equivalent to: |
Object | getProperty(String name,
ImageObserver observer) | This method simply delegates to the same method on the base image and it is equivalent to: |
ImageProducer | getSource() | This method simply delegates to the same method on the base image and it is equivalent to: |
int | getWidth(ImageObserver observer) | This method simply delegates to the same method on the base image and it is equivalent to: |
Methods declared in class java.awt.Image
flush, getAccelerationPriority, getCapabilities, getScaledInstance, setAccelerationPriority
Methods declared in class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
Methods declared in interface java.awt.image.MultiResolutionImage
getResolutionVariant, getResolutionVariants
Constructor Detail
AbstractMultiResolutionImage
public AbstractMultiResolutionImage()
Method Detail
getWidth
public int getWidth(ImageObserver observer)
This method simply delegates to the same method on the base image and it is equivalent to: getBaseImage().getWidth(observer)
.
- Specified by:
-
getWidth
in classImage
- Parameters:
-
observer
- an object waiting for the image to be loaded. - Returns:
- the width of the base image, or -1 if the width is not yet known
- Since:
- 9
- See Also:
getBaseImage()
getHeight
public int getHeight(ImageObserver observer)
This method simply delegates to the same method on the base image and it is equivalent to: getBaseImage().getHeight(observer)
.
- Specified by:
-
getHeight
in classImage
- Parameters:
-
observer
- an object waiting for the image to be loaded. - Returns:
- the height of the base image, or -1 if the height is not yet known
- Since:
- 9
- See Also:
getBaseImage()
getSource
public ImageProducer getSource()
This method simply delegates to the same method on the base image and it is equivalent to: getBaseImage().getSource()
.
- Specified by:
-
getSource
in classImage
- Returns:
- the image producer that produces the pixels for the base image
- Since:
- 9
- See Also:
getBaseImage()
getGraphics
public Graphics getGraphics()
As per the contract of the base Image#getGraphics()
method, this implementation will always throw UnsupportedOperationException
since only off-screen images can return a Graphics
object.
- Specified by:
-
getGraphics
in classImage
- Returns:
- throws
UnsupportedOperationException
- Throws:
-
UnsupportedOperationException
- this method is not supported - See Also:
-
Graphics
,Component.createImage(int, int)
getProperty
public Object getProperty(String name, ImageObserver observer)
This method simply delegates to the same method on the base image and it is equivalent to: getBaseImage().getProperty(name, observer)
.
- Specified by:
-
getProperty
in classImage
- Parameters:
-
name
- a property name. -
observer
- an object waiting for this image to be loaded. - Returns:
- the value of the named property in the base image
- Since:
- 9
- See Also:
getBaseImage()
getBaseImage
protected abstract Image getBaseImage()
Return the base image representing the best version of the image for rendering at the default width and height.
- Returns:
- the base image of the set of multi-resolution images
- Since:
- 9