org.freehep.graphicsbase.util.images

Class ImageHandler

java.lang.Object

org.freehep.graphicsbase.util.images.ImageHandler

public class ImageHandler
extends Object

A convenience class for handling images. Maintains a cache of images suitable for small icons which may be reused often.

Version:

$Id: ImageHandler.java 8584 2006-08-10 23:06:37Z duns $

Author:

Tony Johnson, Cal Loomis

Field Summary

Fields

Modifier and Type	Field and Description
static Cursor	brokenCursor
static Icon	brokenIcon
static Image	brokenImage

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	ImageHandler()

Method Summary

Methods

Modifier and Type	Method and Description
static Cursor	getBestCursor(String name, Class<?> clazz, int width, int height) Create the best cursor by reading from a URL, with hotspot (0,0).
static Cursor	getBestCursor(String name, Class<?> clazz, int width, int height, int x, int y) Create the best cursor by reading from a URL, with hotspot (x, y).
static Cursor	getCursor(String name, Class<?> clazz) Convenience routine, equivalent to getCursor(clazz.getResource(name)); As an additional convenience, if the name does not contain an extension (eg .gif) then a list of common extensions will be tried.
static Cursor	getCursor(String name, Class<?> clazz, int x, int y) Convenience routine, equivalent to getCursor(clazz.getResource(name)); As an additional convenience, if the name does not contain an extension (eg .gif) then a list of common extensions will be tried.
static Cursor	getCursor(URL url) Create a cursor by reading from a URL, with hotspot (0,0).
static Cursor	getCursor(URL url, int x, int y) Create a cursor by reading from a URL
static Icon	getIcon(String name, Class<?> clazz) Convenience routine, equivalent to getIcon(clazz.getResource(name)); As an additional convenience, if the name does not contain an extension (eg .gif) then a list of common extensions will be tried.
static Icon	getIcon(URL url) Create an Icon by reading from a URL
static Image	getImage(String name, Class<?> clazz) Convenience routine, equivalent to getImage(clazz.getResource(name)); As an additional convenience, if the name does not contain an extension (eg .gif) then a list of common extensions will be tried.
static Image	getImage(URL url) Load an image from a URL.

Methods inherited from class java.lang.Object

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

Field Detail

brokenImage

public static final Image brokenImage

brokenCursor

public static final Cursor brokenCursor

brokenIcon

public static final Icon brokenIcon

Constructor Detail

ImageHandler

protected ImageHandler()

Method Detail

getImage

public static Image getImage(URL url)

Load an image from a URL. Images are cached for efficiency. If the image cannot be found will return a brokenImage. No exceptions are thrown.

Parameters:

url - The url of the image to load.

Returns:

The image

getBestCursor

public static Cursor getBestCursor(String name,
                   Class<?> clazz,
                   int width,
                   int height)

Create the best cursor by reading from a URL, with hotspot (0,0).

getBestCursor

public static Cursor getBestCursor(String name,
                   Class<?> clazz,
                   int width,
                   int height,
                   int x,
                   int y)

Create the best cursor by reading from a URL, with hotspot (x, y). The best width and height are inserted into the URL in the spots with %width and %height. Example: getBestCursor("/org/freehep/graphicsbase/swing/images/MyIcon%wx%h.png", 32 32);

Parameters:

name - URL of the cursor

clazz - Class to be used for getting resource

width - suggested width

height - suggested height

x - hotspot

y - hotspot

Returns:

The cursor, the default cursor if custom cursors are not supported or brokenCursor if the cursor cannot be found

getCursor

public static Cursor getCursor(URL url)

Create a cursor by reading from a URL, with hotspot (0,0).

Parameters:

url - The URL to read

Returns:

The cursor, or brokenCursor if the cursor cannot be found

getCursor

public static Cursor getCursor(URL url,
               int x,
               int y)

Create a cursor by reading from a URL

Parameters:

url - The URL to read

x - x position of hotspot

y - y position of hotspot

Returns:

The cursor, or brokenCursor if the cursor cannot be found

getIcon

public static Icon getIcon(URL url)

Create an Icon by reading from a URL

Parameters:

url - The URL to read

Returns:

The icon, or brokenIcon if it cannot be loaded

getImage

public static Image getImage(String name,
             Class<?> clazz)

Convenience routine, equivalent to getImage(clazz.getResource(name)); As an additional convenience, if the name does not contain an extension (eg .gif) then a list of common extensions will be tried.

Parameters:

name - The relative address of the image to load

clazz - The class from which the address is based

Returns:

The image, or brokenImage if no image is found.

getCursor

public static Cursor getCursor(String name,
               Class<?> clazz)

Convenience routine, equivalent to getCursor(clazz.getResource(name)); As an additional convenience, if the name does not contain an extension (eg .gif) then a list of common extensions will be tried.

Parameters:

name - The relative address of the cursor to load

clazz - The class from which the address is based

Returns:

The cursor, or brokenCursor if no cursor is found.

getCursor

public static Cursor getCursor(String name,
               Class<?> clazz,
               int x,
               int y)

Convenience routine, equivalent to getCursor(clazz.getResource(name)); As an additional convenience, if the name does not contain an extension (eg .gif) then a list of common extensions will be tried.

Parameters:

name - The relative address of the cursor to load

clazz - The class from which the address is based

x - hotspot

y - hotspot

Returns:

The cursor, or brokenCursor if no cursor is found.

getIcon

public static Icon getIcon(String name,
           Class<?> clazz)

Convenience routine, equivalent to getIcon(clazz.getResource(name)); As an additional convenience, if the name does not contain an extension (eg .gif) then a list of common extensions will be tried.

Parameters:

name - The relative address of the icon to load

clazz - The class from which the address is based

Returns:

The icon, or brokenIcon if no icon is found.