PaintAlpha (JFreeChart as OSGI-bundle 1.5.6 API)

java.lang.Object
- org.jfree.chart.util.PaintAlpha

```
public class PaintAlpha
extends Object
```
This class contains static methods for the manipulation of objects of type Paint
The intention is to honour the alpha-channel in the process. PaintAlpha was originally conceived to improve the rendering of 3D Shapes with transparent colours and to allow invisible bars by making them completely transparent.
Previously Color.darker() was used for this, which always returns an opaque colour.
Additionally there are methods to control the behaviour and in particular a cloneImage(..) method which is needed to darken objects of type TexturePaint.

Since:

1.0.15

Author:

DaveLaw

Constructor Summary

Constructors
Constructor Description

PaintAlpha()

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	Description
`static BufferedImage`	`cloneImage(BufferedImage image)`	Clone a `BufferedImage`.
`static Paint`	`darker(Paint paint)`	Create a new (if possible, darker) `Paint` of the same Type.
`static boolean`	`setLegacyAlpha(boolean legacyAlpha)`	Per default `PaintAlpha` will try to honour alpha-channel information.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - PaintAlpha
```
public PaintAlpha()
```
- Method Detail
  - setLegacyAlpha
```
public static boolean setLegacyAlpha(boolean legacyAlpha)
```
    Per default PaintAlpha will try to honour alpha-channel information. In the past this was not the case. If you wish legacy functionality for your application you can request this here.
    
    Parameters:
    
    legacyAlpha - boolean
    
    Returns:
    
    the previous setting
  - darker
```
public static Paint darker(Paint paint)
```
    Create a new (if possible, darker) Paint of the same Type. If the Type is not supported, the original Paint is returned.
    
    Parameters:
    
    paint - a Paint implementation (e.g. Color, GradientPaint, TexturePaint,..)
    
    Returns:
    
    a (usually new, see above) Paint
  - cloneImage
```
public static BufferedImage cloneImage(BufferedImage image)
```
    Clone a BufferedImage.
    Note: when constructing the clone, the original Color Model Object is reused.
    That keeps things simple and should not be a problem, as all known Color Models
    (IndexColorModel, DirectColorModel, ComponentColorModel) are immutable.
    
    Parameters:
    
    image - original BufferedImage to clone
    
    Returns:
    
    a new BufferedImage reusing the original's Color Model and containing a clone of its pixels