java.awt.font

Class ImageGraphicAttribute


public final class ImageGraphicAttribute
extends GraphicAttribute

Field Summary

Fields inherited from class java.awt.font.GraphicAttribute

BOTTOM_ALIGNMENT, CENTER_BASELINE, HANGING_BASELINE, ROMAN_BASELINE, TOP_ALIGNMENT

Constructor Summary

ImageGraphicAttribute(Image image, int alignment)
ImageGraphicAttribute(Image image, int alignment, float originX, float originY)

Method Summary

void
draw(Graphics2D graphics, float x, float y)
boolean
equals(ImageGraphicAttribute rhs)
boolean
equals(Object obj)
Determine whether this Object is semantically equal to another Object.
float
getAdvance()
float
getAscent()
Rectangle2D
getBounds()
float
getDescent()
int
hashCode()
Get a value that represents this Object, as uniquely as possible within the confines of an int.

Methods inherited from class java.awt.font.GraphicAttribute

draw, getAdvance, getAlignment, getAscent, getBounds, getDescent, getJustificationInfo

Methods inherited from class java.lang.Object

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

Constructor Details

ImageGraphicAttribute

public ImageGraphicAttribute(Image image,
                             int alignment)

ImageGraphicAttribute

public ImageGraphicAttribute(Image image,
                             int alignment,
                             float originX,
                             float originY)

Method Details

draw

public void draw(Graphics2D graphics,
                 float x,
                 float y)
Overrides:
draw in interface GraphicAttribute

equals

public boolean equals(ImageGraphicAttribute rhs)

equals

public boolean equals(Object obj)
Determine whether this Object is semantically equal to another Object.

There are some fairly strict requirements on this method which subclasses must follow:

  • It must be transitive. If a.equals(b) and b.equals(c), then a.equals(c) must be true as well.
  • It must be symmetric. a.equals(b) and b.equals(a) must have the same value.
  • It must be reflexive. a.equals(a) must always be true.
  • It must be consistent. Whichever value a.equals(b) returns on the first invocation must be the value returned on all later invocations.
  • a.equals(null) must be false.
  • It must be consistent with hashCode(). That is, a.equals(b) must imply a.hashCode() == b.hashCode(). The reverse is not true; two objects that are not equal may have the same hashcode, but that has the potential to harm hashing performance.

This is typically overridden to throw a ClassCastException if the argument is not comparable to the class performing the comparison, but that is not a requirement. It is legal for a.equals(b) to be true even though a.getClass() != b.getClass(). Also, it is typical to never cause a NullPointerException.

In general, the Collections API (java.util) use the equals method rather than the == operator to compare objects. However, IdentityHashMap is an exception to this rule, for its own good reasons.

The default implementation returns this == o.

Overrides:
equals in interface Object
Parameters:
obj - the Object to compare to
Returns:
whether this Object is semantically equal to another

getAdvance

public float getAdvance()
Overrides:
getAdvance in interface GraphicAttribute

getAscent

public float getAscent()
Overrides:
getAscent in interface GraphicAttribute

getBounds

public Rectangle2D getBounds()
Overrides:
getBounds in interface GraphicAttribute

getDescent

public float getDescent()
Overrides:
getDescent in interface GraphicAttribute

hashCode

public int hashCode()
Get a value that represents this Object, as uniquely as possible within the confines of an int.

There are some requirements on this method which subclasses must follow:

  • Semantic equality implies identical hashcodes. In other words, if a.equals(b) is true, then a.hashCode() == b.hashCode() must be as well. However, the reverse is not necessarily true, and two objects may have the same hashcode without being equal.
  • It must be consistent. Whichever value o.hashCode() returns on the first invocation must be the value returned on all later invocations as long as the object exists. Notice, however, that the result of hashCode may change between separate executions of a Virtual Machine, because it is not invoked on the same object.

Notice that since hashCode is used in Hashtable and other hashing classes, a poor implementation will degrade the performance of hashing (so don't blindly implement it as returning a constant!). Also, if calculating the hash is time-consuming, a class may consider caching the results.

The default implementation returns System.identityHashCode(this)

Overrides:
hashCode in interface Object
Returns:
the hash code for this Object

ImageGraphicAttribute.java Copyright (C) 2003 Free Software Foundation, Inc. This file is part of GNU Classpath. GNU Classpath is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. GNU Classpath is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with GNU Classpath; see the file COPYING. If not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. Linking this library statically or dynamically with other modules is making a combined work based on this library. Thus, the terms and conditions of the GNU General Public License cover the whole combination. As a special exception, the copyright holders of this library give you permission to link this library with independent modules to produce an executable, regardless of the license terms of these independent modules, and to copy and distribute the resulting executable under terms of your choice, provided that you also meet, for each linked independent module, the terms and conditions of the license of that module. An independent module is a module which is not derived from or based on this library. If you modify this library, you may extend this exception to your version of the library, but you are not obligated to do so. If you do not wish to do so, delete this exception statement from your version.