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<TITLE>Creating a Buffered Image from an Array of Color-Indexed Pixel Values (Java Developers Almanac Example)
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<h1>The Java Developers Almanac 1.4</h1>
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<A HREF="../java.awt.image/pkg.html">java.awt.image</A><font color="#666666" class="xsmall-font">
[21 examples]
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<B><A HREF="../java.awt.image/pkg.html#Buffered Images">Buffered Images</A></B><font color="#666666" class="xsmall-font">
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<h3>e668. Creating a Buffered Image from an Array of Color-Indexed Pixel Values</h3>
This example demonstrates how to convert a byte array of pixel values
that are indices to a color table into a <code>BufferedImage</code>. In
particular, the example generates the Mandelbrot set in a byte buffer
and combines this data with a <code>SampleModel</code>, <code>ColorModel</code>, and
<code>Raster</code> into a <code>BufferedImage</code>. A 16-color index color model
is used to represent the pixel colors.
<pre> import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import java.awt.image.*;
// Instantiate this class and then use the draw() method to draw the
// generated on the graphics context.
public class Mandelbrot2 {
// Holds the generated image
Image image;
// 16-color model; this method is defined in
// <a href="../java.awt.image/Mandelbrot.html" class="eglink"><b>e660</b> Creating an Image from an Array of Color-Indexed Pixel Values</a>
ColorModel colorModel = generateColorModel();
public Mandelbrot2(int width, int height) {
// Initialize with default location
this(width, height, new Rectangle2D.Float(-2.0f, -1.2f, 3.2f, 2.4f));
}
public Mandelbrot2(int width, int height, Rectangle2D.Float loc) {
// Generate the pixel data; this method is defined in
// <a href="../java.awt.image/Mandelbrot.html" class="eglink"><b>e660</b> Creating an Image from an Array of Color-Indexed Pixel Values</a>
byte[] pixels = generatePixels(width, height, loc);
// Create a data buffer using the byte buffer of pixel data.
// The pixel data is not copied; the data buffer uses the byte buffer array.
DataBuffer dbuf = new DataBufferByte(pixels, width*height, 0);
// The number of banks should be 1
int numBanks = dbuf.getNumBanks(); // 1
// Prepare a sample model that specifies a storage 4-bits of
// pixel datavd in an 8-bit data element
int bitMasks[] = new int[]{(byte)<font color="#0066ff"><i>0xf</i></font>};
SampleModel sampleModel = new SinglePixelPackedSampleModel(
DataBuffer.TYPE_BYTE, width, height, bitMasks);
// Create a raster using the sample model and data buffer
WritableRaster raster = Raster.createWritableRaster(sampleModel, dbuf, null);
// Combine the color model and raster into a buffered image
image = new BufferedImage(colorModel, raster, false, null);//new java.util.Hashtable());
}
public void draw(Graphics g, int x, int y) {
g.drawImage(image, x, y, null);
}
}
</pre>
Here's some code that uses the <code>Mandelbrot2</code> class:
<pre> class RunMandelbrot2 {
static public void main(String[] args) {
new RunMandelbrot2();
}
RunMandelbrot2() {
Frame frame = new Frame("Mandelbrot2 Set");
frame.add(new MyCanvas());
frame.setSize(<font color="#0066ff"><i>300</i></font>, <font color="#0066ff"><i>200</i></font>) ;
frame.setVisible(true);
}
class MyCanvas extends Canvas {
Mandelbrot2 mandelbrot;
MyCanvas() {
// Add a listener for resize events
addComponentListener(new ComponentAdapter() {
// This method is called when the component's size changes
public void componentResized(ComponentEvent evt) {
Component c = (Component)evt.getSource();
// Get new size
Dimension newSize = c.getSize();
// Regenerate the image
mandelbrot = new Mandelbrot2(newSize.width, newSize.height);
c.repaint();
}
});
}
public void paint(Graphics g) {
if (mandelbrot != null) {
mandelbrot.draw(g, 0, 0);
}
}
}
}
</pre>
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<b>Related Examples</b></font></td>
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e666. <a class="eglink" href="CreateBuf.html?l=rel">
Creating a Buffered Image
</a>
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e667. <a class="eglink" href="Image2Buf.html?l=rel">
Creating a Buffered Image from an Image
</a>
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e669. <a class="eglink" href="DrawOnImage.html?l=rel">
Drawing on a Buffered Image
</a>
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e670. <a class="eglink" href="Buf2Image.html?l=rel">
Converting a Buffered Image to an Image
</a>
<br>
e671. <a class="eglink" href="ImagePixel.html?l=rel">
Getting and Setting Pixels in a Buffered Image
</a>
<br>
e672. <a class="eglink" href="CreateTxImage.html?l=rel">
Scaling, Shearing, Translating, and Rotating a Buffered Image
</a>
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See also:
<a class="eglink" href="/egs/java.awt.image/pkg.html?l=rel#Effects">
Effects
</a>
<a class="eglink" href="/egs/java.awt.image/pkg.html?l=rel#Images">
Images
</a>
<a class="eglink" href="/egs/java.awt.image/pkg.html?l=rel#Volatile%20Images">
Volatile Images
</a>
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