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praktikum-holons
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<h2 title="Class PaintAlpha" class="title">Class PaintAlpha</h2>
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<pre>public class <a href="../../../../src-html/org/jfree/chart/util/PaintAlpha.html#line.83">PaintAlpha</a>
extends java.lang.Object</pre>
<div class="block">This class contains static methods for the manipulation
 of objects of type <code>Paint</code>
 <p>
 The intention is to honour the alpha-channel in the process.
 <code>PaintAlpha</code> was originally conceived to improve the
 rendering of 3D Shapes with transparent colours and to allow
 invisible bars by making them completely transparent.
 <p>
 In, for example
 <a href="../../../../org/jfree/chart/renderer/category/StackedBarRenderer3D.html" title="class in org.jfree.chart.renderer.category"><code>StackedBarRenderer3D</code></a>,
 bars are rendered with 6 faces. The front face is rendered with
 the <code>Paint</code> requested. The other 5 faces are rendered
 darker to achieve the 3D effect.
 <p>
 Previously <code>Color.darker()</code> was used for this,
 which always returns an opaque colour.
 <p>
 Additionally there are methods to control the behaviour and
 in particular a <a href="../../../../org/jfree/chart/util/PaintAlpha.html#cloneImage-java.awt.image.BufferedImage-"><code>cloneImage(..)</code></a>
 method which is needed to darken objects of type <code>TexturePaint</code>.</div>
<dl>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>1.0.15</dd>
<dt><span class="simpleTagLabel">Author:</span></dt>
<dd>DaveLaw</dd>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/jfree/chart/util/PaintAlpha.html#PaintAlpha--">PaintAlpha</a></span>()</code>&nbsp;</td>
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<td class="colFirst"><code>static java.awt.image.BufferedImage</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/jfree/chart/util/PaintAlpha.html#cloneImage-java.awt.image.BufferedImage-">cloneImage</a></span>(java.awt.image.BufferedImage&nbsp;image)</code>
<div class="block">Clone a <code>BufferedImage</code>.</div>
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<td class="colFirst"><code>static java.awt.Paint</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/jfree/chart/util/PaintAlpha.html#darker-java.awt.Paint-">darker</a></span>(java.awt.Paint&nbsp;paint)</code>
<div class="block">Create a new (if possible, darker) <code>Paint</code> of the same Type.</div>
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<td class="colFirst"><code>static boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/jfree/chart/util/PaintAlpha.html#setLegacyAlpha-boolean-">setLegacyAlpha</a></span>(boolean&nbsp;legacyAlpha)</code>
<div class="block">Per default <code>PaintAlpha</code> will try to honour alpha-channel
 information.</div>
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<h4>PaintAlpha</h4>
<pre>public&nbsp;<a href="../../../../src-html/org/jfree/chart/util/PaintAlpha.html#line.83">PaintAlpha</a>()</pre>
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<h4>setLegacyAlpha</h4>
<pre>public static&nbsp;boolean&nbsp;<a href="../../../../src-html/org/jfree/chart/util/PaintAlpha.html#line.107">setLegacyAlpha</a>(boolean&nbsp;legacyAlpha)</pre>
<div class="block">Per default <code>PaintAlpha</code> 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.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>legacyAlpha</code> - boolean</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the previous setting</dd>
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<h4>darker</h4>
<pre>public static&nbsp;java.awt.Paint&nbsp;<a href="../../../../src-html/org/jfree/chart/util/PaintAlpha.html#line.122">darker</a>(java.awt.Paint&nbsp;paint)</pre>
<div class="block">Create a new (if possible, darker) <code>Paint</code> of the same Type.
 If the Type is not supported, the original <code>Paint</code> is returned.
 <p></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>paint</code> - a <code>Paint</code> implementation
 (e.g. <code>Color</code>, <code>GradientPaint</code>, <code>TexturePaint</code>,..)
 <p></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>a (usually new, see above) <code>Paint</code></dd>
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<h4>cloneImage</h4>
<pre>public static&nbsp;java.awt.image.BufferedImage&nbsp;<a href="../../../../src-html/org/jfree/chart/util/PaintAlpha.html#line.378">cloneImage</a>(java.awt.image.BufferedImage&nbsp;image)</pre>
<div class="block">Clone a <code>BufferedImage</code>.
 <p>
 Note: when constructing the clone, the original Color Model Object is
 reused.<br>  That keeps things simple and should not be a problem, as all
 known Color Models<br>
 (<code>IndexColorModel</code>,
  <code>DirectColorModel</code>,
  <code>ComponentColorModel</code>) are
 immutable.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>image</code> - original BufferedImage to clone</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>a new BufferedImage reusing the original's Color Model and
         containing a clone of its pixels</dd>
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