drawonimage.html

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<TITLE>Drawing on a Buffered Image
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    <B><A HREF="../java.awt.image/pkg.html">java.awt.image</A></B><font color="#666666" SIZE="-2">
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  <h3>
    e673.  
    Drawing on a Buffered Image</h3>

To draw on a buffered image, create a graphics context on the
buffered image. 


<pre>
    // Create a graphics context on the buffered image
    Graphics2D g2d = <font color="#0066ff"><i>bimage</i></font>.createGraphics();
    
    // Draw on the image
    g2d.setColor(<font color="#0066ff"><i>Color.red</i></font>);
    g2d.fill(<font color="#0066ff"><i>new Ellipse2D.Float(0, 0, 200, 100)</i></font>);
    g2d.dispose();
</pre>

If the buffered image supports transparency,
(see <a href="../java.awt.image/HasAlpha.html" class="eglink"><font size="-1"><b>e665</b> Determining If an Image Has Transparent Pixels</font></a>), 
pixels can be made transparent:


<pre>
    g2d = <font color="#0066ff"><i>bimage</i></font>.createGraphics();
    
    // Make all filled pixels transparent
    Color transparent = new Color(0, 0, 0, 0);
    g2d.setColor(transparent);
    g2d.setComposite(AlphaComposite.Src);
    g2d.fill(<font color="#0066ff"><i>new Rectangle2D.Float(20, 20, 100, 20)</i></font>);
    g2d.dispose();
</pre>
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            &nbsp;Related Examples
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e670. <a class="eglink" href="CreateBuf.html?l=rel">
    Creating a Buffered Image
</a>
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e671. <a class="eglink" href="Image2Buf.html?l=rel">
    Creating a Buffered Image from an Image
</a>
<br>

e672. <a class="eglink" href="Mandelbrot2.html?l=rel">
    Creating a Buffered Image from an Array of Color-Indexed Pixel Values
</a>
<br>

e674. <a class="eglink" href="Buf2Image.html?l=rel">
    Converting a Buffered Image to an Image
</a>
<br>

e675. <a class="eglink" href="ImagePixel.html?l=rel">
    Getting and Setting Pixels in a Buffered Image
</a>
<br>

e676. <a class="eglink" href="CreateTxImage.html?l=rel">
    Scaling, Shearing, Translating, and Rotating a Buffered Image
</a>
<br>


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        See also: 
<a class="eglink" href="/egs/java.awt.image/pkg.html?l=rel#Effects">
    Effects
</a>&nbsp;&nbsp;

<a class="eglink" href="/egs/java.awt.image/pkg.html?l=rel#Images">
    Images
</a>&nbsp;&nbsp;

<a class="eglink" href="/egs/java.awt.image/pkg.html?l=rel#Volatile%20Images">
    Volatile Images
</a>&nbsp;&nbsp;

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