Class AlphaComposite

public static final int CLEAR

Field Value:

1

public static final AlphaComposite Clear

public static final int DST

Field Value:

9

public static final int DST_ATOP

Field Value:

11

public static final int DST_IN

Field Value:

6

public static final int DST_OUT

Field Value:

8

public static final int DST_OVER

Field Value:

4

public static final AlphaComposite Dst

public static final AlphaComposite DstAtop

public static final AlphaComposite DstIn

public static final AlphaComposite DstOut

public static final AlphaComposite DstOver

public static final int SRC

Field Value:

2

public static final int SRC_ATOP

Field Value:

10

public static final int SRC_IN

Field Value:

5

public static final int SRC_OUT

Field Value:

7

public static final int SRC_OVER

Field Value:

3

public static final AlphaComposite Src

public static final AlphaComposite SrcAtop

public static final AlphaComposite SrcIn

public static final AlphaComposite SrcOut

public static final AlphaComposite SrcOver

public static final int XOR

Field Value:

12

public static final AlphaComposite Xor

public CompositeContext createContext(ColorModel srcColorModel,
                                      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

Parameters:

srcColorModel - the color model of the source raster

dstColorModel - the color model of the destination raster

hints - the rendering hints to use

Returns:

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

public boolean equals(Object o)

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:

Returns:

whether this Object is semantically equal to another

See Also:

Object.hashCode()

public float getAlpha()

public static AlphaComposite getInstance(int rule)

Creates an AlphaComposite object with the specified rule.

Parameters:

rule - The compositing rule.

Throws:

IllegalArgumentException - If rule is not one of the following: CLEAR, SRC, DST, SRC_OVER, DST_OVER, SRC_IN, DST_IN, SRC_OUT, DST_OUT, SRC_ATOP, DST_ATOP, or XOR.

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.

Parameters:

rule - The compositing rule.

Throws:

IllegalArgumentException - If rule is not one of the following: CLEAR, SRC, DST, SRC_OVER, DST_OVER, SRC_IN, DST_IN, SRC_OUT, DST_OUT, SRC_ATOP, DST_ATOP, or XOR.

public int getRule()

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

See Also:

Object.equals(Object), System.identityHashCode(Object)