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java.awt
Class AlphaComposite  

java.lang.Object
  java.awt.AlphaComposite

All Implemented Interfaces:

Composite

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public final class AlphaComposite

extends java.lang.Object

implements Composite

Since:

1.3

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Field Summary
private  float	alpha
private static java.util.LinkedHashMap	cache           Map Long to AlphaComposites.
static AlphaComposite	Clear
static int	CLEAR
static AlphaComposite	Dst
static int	DST
static int	DST_ATOP
static int	DST_IN
static int	DST_OUT
static int	DST_OVER
static AlphaComposite	DstAtop
static AlphaComposite	DstIn
static AlphaComposite	DstOut
static AlphaComposite	DstOver
private  int	rule
static AlphaComposite	Src
static int	SRC
static int	SRC_ATOP
static int	SRC_IN
static int	SRC_OUT
static int	SRC_OVER
static AlphaComposite	SrcAtop
static AlphaComposite	SrcIn
static AlphaComposite	SrcOut
static AlphaComposite	SrcOver
static AlphaComposite	Xor
static int	XOR

 

Constructor Summary
private	AlphaComposite(int rule, float alpha)

 

Method Summary
CompositeContext	createContext(java.awt.image.ColorModel srcColorModel, java.awt.image.ColorModel dstColorModel, RenderingHints hints)           Creates a CompositeContext that can be used to perform compositing operations according to this AlphaComposite settings.
boolean	equals(java.lang.Object o)           Determine whether this Object is semantically equal to another Object.
float	getAlpha()
static AlphaComposite	getInstance(int rule)           Creates an AlphaComposite object with the specified rule.
static AlphaComposite	getInstance(int rule, float alpha)           Creates an AlphaComposite object with the specified rule and the constant alpha to multiply with the alpha of the source.
int	getRule()
int	hashCode()           Get a value that represents this Object, as uniquely as possible within the confines of an int.

 

Methods inherited from class java.lang.Object

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

 

Field Detail

cache

private static final java.util.LinkedHashMap cache

Map Long to AlphaComposites. See getInstance for details.

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CLEAR

public static final int CLEAR

See Also:

Constant Field Values

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SRC

public static final int SRC

See Also:

Constant Field Values

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DST

public static final int DST

See Also:

Constant Field Values

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SRC_OVER

public static final int SRC_OVER

See Also:

Constant Field Values

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DST_OVER

public static final int DST_OVER

See Also:

Constant Field Values

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SRC_IN

public static final int SRC_IN

See Also:

Constant Field Values

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DST_IN

public static final int DST_IN

See Also:

Constant Field Values

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SRC_OUT

public static final int SRC_OUT

See Also:

Constant Field Values

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DST_OUT

public static final int DST_OUT

See Also:

Constant Field Values

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SRC_ATOP

public static final int SRC_ATOP

See Also:

Constant Field Values

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DST_ATOP

public static final int DST_ATOP

See Also:

Constant Field Values

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XOR

public static final int XOR

See Also:

Constant Field Values

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Clear

public static final AlphaComposite Clear

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Src

public static final AlphaComposite Src

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Dst

public static final AlphaComposite Dst

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SrcOver

public static final AlphaComposite SrcOver

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DstOver

public static final AlphaComposite DstOver

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SrcIn

public static final AlphaComposite SrcIn

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DstIn

public static final AlphaComposite DstIn

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SrcOut

public static final AlphaComposite SrcOut

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DstOut

public static final AlphaComposite DstOut

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SrcAtop

public static final AlphaComposite SrcAtop

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DstAtop

public static final AlphaComposite DstAtop

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Xor

public static final AlphaComposite Xor

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rule

private final int rule

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alpha

private final float alpha

Constructor Detail

AlphaComposite

private AlphaComposite(int rule,
                       float alpha)

Method Detail

getInstance

public static AlphaComposite getInstance(int rule)

Creates an AlphaComposite object with the specified rule.

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getInstance

public static AlphaComposite getInstance(int rule,
                                         float alpha)

Creates an AlphaComposite object with the specified rule and the constant alpha to multiply with the alpha of the source. The source is multiplied with the specified alpha before being composited with the destination.

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createContext

public CompositeContext createContext(java.awt.image.ColorModel srcColorModel,
                                      java.awt.image.ColorModel dstColorModel,
                                      RenderingHints hints)

Creates a CompositeContext that can be used to perform compositing operations according to this AlphaComposite settings.

Specified by:

createContext in interface Composite

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getAlpha

public float getAlpha()

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getRule

public int getRule()

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hashCode

public int hashCode()

Description copied from class: java.lang.Object

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 java.util.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)

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equals

public boolean equals(java.lang.Object o)

Description copied from class: java.lang.Object

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 java.lang.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 java.lang.NullPointerException.

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

The default implementation returns this == o.

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